'mhlo' Dialect

Operation definition

`mhlo.abs` (::mlir::mhlo::AbsOp)

Abs operation

Syntax:

operation ::= `mhlo.abs` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise abs operation on operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#abs

Example:

%result = mhlo.abs %operand : tensor<3xi32>

Traits: AlwaysSpeculatableImplTrait, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of 4/8/16/32/64-bit signless integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of 4/8/16/32/64-bit signless integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

`mhlo.add_dependency` (::mlir::mhlo::AddDependencyOp)

AddDependency operation

Syntax:

operation ::= `mhlo.add_dependency` operands attr-dict `:` functional-type(operands, results)

This operation is private to the XLA compiler, so it is does not yet have a specification.

Informally, this operation two operands: a data operand and a token. The output of the operation is the data operand. When used with AfterAll this operation enables ordering non-side-effecting operations (those that do not produce token values).

Example:

%1 = mhlo.add_dependency %arg0, %0 : (tensor<3x4xf32>, !mhlo.token) -> tensor<3x4xf32>

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand Description

token token

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token
`token`	token

Results:

Result Description

output tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token

Result	Description
`output`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token

`mhlo.add` (::mlir::mhlo::AddOp)

Add operation

Syntax:

operation ::= `mhlo.add` $lhs `,` $rhs attr-dict
              `:` custom<SameOperandsAndResultType>(type($lhs), type($rhs), type($result))

Performs element-wise addition of two tensors lhs and rhs and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#add

Example:

%result = mhlo.add %lhs, %rhs : tensor<2x2xi32>

Traits: AlwaysSpeculatableImplTrait, Commutative, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand Description

lhs tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

rhs tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

Results:

Result Description

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

`mhlo.after_all` (::mlir::mhlo::AfterAllOp)

AfterAll operation

Syntax:

operation ::= `mhlo.after_all` $inputs attr-dict
              `:` custom<VariadicSameOperandsAndResultType>(ref($inputs), type($inputs), type($result))

Ensures that the operations producing the inputs are executed before any operations that depend on result.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#after_all

Example:

%result = mhlo.after_all %input0, %input1 : !mhlo.token

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`inputs`	token

Results:

Result	Description
`result`	token

`mhlo.all_gather` (::mlir::mhlo::AllGatherOp)

AllGather operation

Within each process group in the process grid, concatenates the values of the operand tensor from each process along all_gather_dim and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#all_gather

Example:

%result = "mhlo.all_gather"(%operand) {
  all_gather_dim = 1 : i64,
  replica_groups = dense<[[0, 1]]> : tensor<1x2xi64>
  // channel_id = 0
  channel_handle = #mhlo.channel_handle<handle = 0, type = 0>,
  // use_global_device_ids = false
} : (tensor<2x2xf32>) -> tensor<2x4xf32>

Traits: SameOperandsAndResultElementType

Attributes:

Attribute	MLIR Type	Description
`all_gather_dim`	::mlir::IntegerAttr	64-bit signless integer attribute
`replica_groups`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`channel_handle`	::mlir::mhlo::ChannelHandleAttr	two 64-bit integers 'handle' and 'type'
`use_global_device_ids`	::mlir::UnitAttr	unit attribute

Operands:

Operand Description

Results:

Result	Description
«unnamed»	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

Result

Description

«unnamed»

`mhlo.all_reduce` (::mlir::mhlo::AllReduceOp)

AllReduce operation

Within each process group in the process grid, applies a reduction function computation to the values of the operand tensor from each process and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#all_reduce

Example:

%result = "mhlo.all_reduce"(%operand) ({
  ^bb0(%arg0: tensor<f32>, %arg1: tensor<f32>):
    %0 = mhlo.add %arg1, %arg2 : tensor<f32>
    mhlo.return %0 : tensor<f32>
}) {
  replica_groups = dense<[[0, 1]]> : tensor<1x2xi64>
  // channel_id = 0
  channel_handle = #mhlo.channel_handle<handle = 0, type = 0>
  // use_global_device_ids = false
} : (tensor<4xf32>) -> tensor<4xf32>

Traits: CompatibleOperandsAndResultType

Interfaces: InferShapedTypeOpInterface, InferTypeOpInterface

Attributes:

Attribute	MLIR Type	Description
`replica_groups`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`channel_handle`	::mlir::mhlo::ChannelHandleAttr	two 64-bit integers 'handle' and 'type'
`use_global_device_ids`	::mlir::UnitAttr	unit attribute

Operands:

Operand Description

Results:

Result	Description
«unnamed»	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

Result

Description

«unnamed»

`mhlo.all_to_all` (::mlir::mhlo::AllToAllOp)

AllToAll operation

Within each process group in the process grid, splits the values of the operand tensor along split_dimension into parts, scatters the split parts between the processes, concatenates the scattered parts along concat_dimension and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#all_to_all

Example:

%result = "mhlo.all_to_all"(%operand) {
  split_dimension = 1 : i64,
  concat_dimension = 0 : i64,
  split_count = 2 : i64,
  replica_groups = dense<[[0, 1]]> : tensor<1x2xi64>
} : (tensor<2x4xf32>) -> tensor<4x2xf32>

Traits: AlwaysSpeculatableImplTrait, InferTensorType, SameOperandsElementType, SameOperandsShape, SameVariadicOperandSize

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`split_dimension`	::mlir::IntegerAttr	64-bit signless integer attribute
`concat_dimension`	::mlir::IntegerAttr	64-bit signless integer attribute
`split_count`	::mlir::IntegerAttr	64-bit signless integer attribute
`replica_groups`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`channel_handle`	::mlir::mhlo::ChannelHandleAttr	two 64-bit integers 'handle' and 'type'

Operands:

Operand Description

Results:

Result	Description
«unnamed»	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

Result

Description

«unnamed»

`mhlo.and` (::mlir::mhlo::AndOp)

And operation

Syntax:

operation ::= `mhlo.and` $lhs `,` $rhs attr-dict
              `:` custom<SameOperandsAndResultType>(type($lhs), type($rhs), type($result))

Performs element-wise AND of two tensors lhs and rhs and produces a result tensor

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#and

Example:

%result = mhlo.and %lhs, %rhs : tensor<2x2xi32>

Traits: AlwaysSpeculatableImplTrait, Commutative, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`lhs`	tensor of pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values
`rhs`	tensor of pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result Description

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

`mhlo.async_done` (::mlir::mhlo::AsyncDoneOp)

AsyncDone operation

This operation is private to the XLA compiler, so it is does not yet have a specification.

Informally, this operation blocks until the end of an asynchronous computation. It returns the final result of the asynchronous computation.

See the documentation for AsyncStart for more information.

Interfaces: InferTypeOpInterface

Attributes:

Attribute	MLIR Type	Description
`called_computation`	::mlir::FlatSymbolRefAttr	flat symbol reference attribute
`execution_thread`	::mlir::StringAttr	string attribute
`group_id`	::mlir::IntegerAttr	64-bit signless integer attribute

Operands:

Operand Description

bundle async_bundle with any combination of tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token values

Operand	Description
`bundle`	async_bundle with any combination of tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token values

Results:

Result	Description
«unnamed»	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token or nested tuple with any combination of tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token values

Result

Description

«unnamed»

tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token or nested tuple with any combination of tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token values

`mhlo.async_start` (::mlir::mhlo::AsyncStartOp)

AsyncStart operation

This operation is private to the XLA compiler, so it is does not yet have a specification.

Informally, this operation kicks off an asynchronous computation.

This is used when there are functions that contain both asynchronous waits (such as DMAs) and on-thread computation. For example, a function might consist of a computation, a DMA, another computation, a second DMA, and a final computation. This would be represented as an async_start followed by and async_update and an async_done. The async_start would do the first computation on-thread and then start the DMA. The async_update would wait for the DMA to complete if it wasn't yet done, then execute the second computation in the function, and start the second DMA. Finally, the async_done would wait on this last DMA, and then run the last computation that needs to be run on-thread and return the result of that final computation.

operands are passed to the computation directly called_computation is the function that will be run asynchronously execution_thread is the name of the thread in which it will be run. The main thread is called "main". All threads have names. group_id labels a set of async-start, async-done, and zero or more async-update ops corresponding to the same computation. We represent a missing group_id with either an negative value or None.

This returns all the state needed between async ops. After buffer assignment, the return values represents the space needed to hold the input, results, and any scratchpads needed or edited by the async op.

Attributes:

Attribute	MLIR Type	Description
`called_computation`	::mlir::FlatSymbolRefAttr	flat symbol reference attribute
`execution_thread`	::mlir::StringAttr	string attribute
`group_id`	::mlir::IntegerAttr	64-bit signless integer attribute

Operands:

Operand Description

inputs tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token or nested tuple with any combination of tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token values

Operand	Description
`inputs`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token or nested tuple with any combination of tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token values

Results:

Result	Description
«unnamed»	async_bundle with any combination of tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token values

Result

Description

«unnamed»

async_bundle with any combination of tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token values

`mhlo.async_update` (::mlir::mhlo::AsyncUpdateOp)

AsyncUpdate operation

This operation is private to the XLA compiler, so it is does not yet have a specification.

Informally, this operation blocks on an asynchronous computation until a sync barrier. This returns bundle after operating on it.

See the documentation for AsyncStart for more information.

Interfaces: InferTypeOpInterface

Attributes:

Attribute	MLIR Type	Description
`called_computation`	::mlir::FlatSymbolRefAttr	flat symbol reference attribute
`execution_thread`	::mlir::StringAttr	string attribute
`group_id`	::mlir::IntegerAttr	64-bit signless integer attribute

Operands:

Operand Description

Operand	Description
`bundle`	async_bundle with any combination of tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token values

Results:

Result	Description
«unnamed»	async_bundle with any combination of tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token values

Result

Description

«unnamed»

`mhlo.atan2` (::mlir::mhlo::Atan2Op)

Atan2 operation

Syntax:

operation ::= `mhlo.atan2` $lhs `,` $rhs attr-dict
              `:` custom<SameOperandsAndResultType>(type($lhs), type($rhs), type($result))

Performs element-wise atan2 operation on lhs and rhs tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#atan2

Example:

%result = mhlo.atan2 %lhs, %rhs : tensor<3xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`lhs`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values
`rhs`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.batch_norm_grad` (::mlir::mhlo::BatchNormGradOp)

BatchNormGrad operation

Computes gradients of several inputs of BatchNormTrainingOp backpropagating from grad_output, and produces grad_operand, grad_scale and grad_offset tensors.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#batch_norm_grad

Example:

%grad_operand, %grad_scale, %grad_offset =
"mhlo.batch_norm_grad"(%operand, %scale, %mean, %variance, %grad_output) {
  epsilon = 0.0 : f32,
  feature_index = 2 : i64
} : (tensor<2x2x2xf32>, tensor<2xf32>, tensor<2xf32>, tensor<2xf32>,
    tensor<2x2x2xf32>) -> (tensor<2x2x2xf32>, tensor<2xf32>, tensor<2xf32>)

Traits: AlwaysSpeculatableImplTrait, InferTensorType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`epsilon`	::mlir::FloatAttr	32-bit float attribute
`feature_index`	::mlir::IntegerAttr	64-bit signless integer attribute

Operands:

Operand	Description
`operand`	ranked tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values
`scale`	1D tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values
`mean`	1D tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values
`variance`	1D tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values
`grad_output`	ranked tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

Results:

Result	Description
`grad_operand`	ranked tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values
`grad_scale`	1D tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values
`grad_offset`	1D tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

`mhlo.batch_norm_inference` (::mlir::mhlo::BatchNormInferenceOp)

BatchNormInference operation

Normalizes the operand tensor across all dimensions except for the feature_index dimension and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#batch_norm_inference

Example:

%result = "mhlo.batch_norm_inference"(%operand, %scale, %offset, %mean, %variance) {
  epsilon = 0.0 : f32,
  feature_index = 2 : i64
} : (tensor<2x2x2xf32>, tensor<2xf32>, tensor<2xf32>, tensor<2xf32>, tensor<2xf32>) -> tensor<2x2x2xf32>

Traits: AlwaysSpeculatableImplTrait, InferTensorType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`epsilon`	::mlir::FloatAttr	32-bit float attribute
`feature_index`	::mlir::IntegerAttr	64-bit signless integer attribute

Operands:

Operand	Description
`operand`	ranked tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values
`scale`	1D tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values
`offset`	1D tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values
`mean`	1D tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values
`variance`	1D tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

Results:

Result	Description
`result`	ranked tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

`mhlo.batch_norm_training` (::mlir::mhlo::BatchNormTrainingOp)

BatchNormTraining operation

Computes mean and variance across batch and spatial dimensions and normalizes the operand tensor, for each feature in the feature_index dimension and produces output, batch_mean and batch_var tensors.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#batch_norm_training

Example:

%output, %batch_mean, %batch_var = "mhlo.batch_norm_training"(%operand, %scale, %offset) {
  epsilon = 0.0 : f32,
  feature_index = 2 : i64
} : (tensor<2x2x2xf32>, tensor<2xf32>, tensor<2xf32>) -> (tensor<2x2x2xf32>, tensor<2xf32>, tensor<2xf32>)

Traits: AlwaysSpeculatableImplTrait, InferTensorType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`epsilon`	::mlir::FloatAttr	32-bit float attribute
`feature_index`	::mlir::IntegerAttr	64-bit signless integer attribute

Operands:

Operand	Description
`operand`	ranked tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values
`scale`	1D tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values
`offset`	1D tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

Results:

Result	Description
`output`	ranked tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values
`batch_mean`	1D tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values
`batch_var`	1D tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

`mhlo.bitcast_convert` (::mlir::mhlo::BitcastConvertOp)

BitcastConvert operation

Syntax:

operation ::= `mhlo.bitcast_convert` operands attr-dict `:` functional-type(operands, results)

Performs a bitcast operation on operand tensor and produces a result tensor where the bits of the entire operand tensor are reinterpreted using the type of the result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#bitcast_convert

Example:

%result = mhlo.bitcast_convert %operand : (tensor<2xf32>) -> tensor<2x4xi8>

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand Description

Results:

Result	Description
«unnamed»	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

Result

Description

«unnamed»

`mhlo.bitcast` (::mlir::mhlo::BitcastOp)

Bitcast operation

Syntax:

operation ::= `mhlo.bitcast` operands attr-dict `:` functional-type(operands, results)

This operation is private to the XLA compiler, so it is does not yet have a specification.

Informally, this operation changes the shape of the input in the way that the physical arrangement of elements are unchanged.

This operation needs layout information to make sense of "physical arrangement of elements", and layout support in MHLO is currently a work in progress.

Example:

%0 = mhlo.bitcast %arg0 : (tensor<3x4xf32>) -> tensor<3x4x1xf32>

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand Description

Results:

Result	Description
«unnamed»	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

Result

Description

«unnamed»

`mhlo.broadcast_in_dim` (::mlir::mhlo::BroadcastInDimOp)

BroadcastInDim operation

Expands the dimensions and/or rank of an input tensor by duplicating the data in the operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#broadcast_in_dim

Example:

%result = mhlo.broadcast_in_dim %operand, dims = [2, 1] : (tensor<1x3xi32>) -> tensor<2x3x2xi32>

Traits: AlwaysSpeculatableImplTrait, SameOperandsAndResultElementType

Interfaces: ConditionallySpeculatable, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`broadcast_dimensions`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute

Operands:

Operand Description

Results:

Result	Description
«unnamed»	statically shaped tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

Result

Description

«unnamed»

statically shaped tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

`mhlo.broadcast` (::mlir::mhlo::BroadcastOp)

Broadcast operation

This operation is on its way out of StableHLO, so it is not included in the specification: https://github.com/openxla/stablehlo/issues/3

Informally, this operation does the same thing as XLA's Broadcast: https://www.tensorflow.org/xla/operation_semantics#broadcast

Example:

%result = mhlo.broadcast %operand, sizes = [1, 2] : (tensor<3xi32>) -> tensor<1x2x3xi32>

Traits: AlwaysSpeculatableImplTrait, InferTensorType, SameOperandsAndResultElementType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`broadcast_sizes`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute

Operands:

Operand Description

Results:

Result	Description
«unnamed»	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

Result

Description

«unnamed»

`mhlo.case` (::mlir::mhlo::CaseOp)

Case operation

Produces the output from executing exactly one function from branches depending on the value of index.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#case

Example:

%result0, %result1 = "mhlo.case"(%index) ({
  mhlo.return %result_branch0, %result_branch0 : tensor<2xi64>, tensor<2xi64>
}, {
  mhlo.return %result_branch1, %result_branch1 : tensor<2xi64>, tensor<2xi64>
}) : (tensor<i32>) -> (tensor<2xi64>, tensor<2xi64>)

Traits: RecursiveMemoryEffects, SingleBlockImplicitTerminator

Interfaces: InferTypeOpInterface

Operands:

Operand	Description
`index`	tensor of 32-bit signless integer values

Results:

Result

Description

«unnamed»

`mhlo.cbrt` (::mlir::mhlo::CbrtOp)

Cbrt operation

Syntax:

operation ::= `mhlo.cbrt` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise cubic root operation on operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#cbrt

Example:

%result = mhlo.cbrt %operand : tensor<4xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.ceil` (::mlir::mhlo::CeilOp)

Ceil operation

Syntax:

operation ::= `mhlo.ceil` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise ceil of operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#ceil

Example:

%result = mhlo.ceil %operand : tensor<5xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

`mhlo.cholesky` (::mlir::mhlo::CholeskyOp)

Cholesky operation

Computes the Cholesky decomposition of a batch of matrices.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#cholesky

Example:

%result = mhlo.cholesky %a, lower = true : tensor<3x3xf32>

Traits: AlwaysSpeculatableImplTrait, InferTensorType, SameOperandsAndResultElementType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`lower`	::mlir::BoolAttr	bool attribute

Operands:

Operand	Description
`a`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
«unnamed»	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.clamp` (::mlir::mhlo::ClampOp)

Clamp operation

Syntax:

operation ::= `mhlo.clamp` $min `,` $operand `,` $max attr-dict
              `:` custom<SameOperandsAndResultType>(type($min), type($operand), type($max), type($result))

Clamps every element of the operand tensor between a minimum and maximum value and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#clamp

Example:

%result = mhlo.clamp %min, %operand, %max : tensor<3xi32>

Traits: AlwaysSpeculatableImplTrait, HLO_BroadcastingElementwise, InferTensorType, SameOperandsAndResultElementType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`min`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values
`max`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

Results:

Result Description

`mhlo.count_leading_zeros` (::mlir::mhlo::ClzOp)

Clz operation

Syntax:

operation ::= `mhlo.count_leading_zeros` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise count of the number of leading zero bits in the operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#count_leading_zeros

Example:

%result = mhlo.count_leading_zeros %operand : tensor<2x2xi8>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result	Description
`result`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

`mhlo.collective_permute` (::mlir::mhlo::CollectivePermuteOp)

CollectivePermute operation

Within each process group in the process grid, sends the value of the operand tensor from the source process to the target process and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#collective_permute

Example:

%result = "mhlo.collective_permute"(%operand) {
  source_target_pairs = dense<[[0, 1], [1, 2]]> : tensor<2x2xi64>,
  // channel_id = 0
  channel_handle = #mhlo.channel_handle<handle = 0, type = 0>
} : (tensor<4x2xf32>) -> tensor<4x2xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`source_target_pairs`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`channel_handle`	::mlir::mhlo::ChannelHandleAttr	two 64-bit integers 'handle' and 'type'

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.compare` (::mlir::mhlo::CompareOp)

Compare operation

Syntax:

operation ::= `mhlo.compare` $comparison_direction `,` $lhs `,` $rhs (`,` $compare_type^)?
              attr-dict `:` functional-type(operands, results)

Performs element-wise comparison of lhs and rhs tensors according to comparison_direction and compare_type, and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#compare

Example:

%result = mhlo.compare LT, %lhs, %rhs, FLOAT : (tensor<2xf32>, tensor<2xf32>) -> tensor<2xi1>

Traits: AlwaysSpeculatableImplTrait, Elementwise, InferTensorType, SameOperandsAndResultShape, SameOperandsElementType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`comparison_direction`	::mlir::mhlo::ComparisonDirectionAttr	Which comparison operation to perform.
`compare_type`	::mlir::mhlo::ComparisonTypeAttr	Which comparison type to use.

Operands:

Operand Description

Results:

Result	Description
«unnamed»	tensor of pred (AKA boolean or 1-bit integer) values

`mhlo.complex` (::mlir::mhlo::ComplexOp)

Complex operation

Syntax:

operation ::= `mhlo.complex` operands attr-dict
              `:` custom<ComplexOpType>(type($lhs), type($rhs), type($result))

Performs element-wise conversion to a complex value from a pair of real and imaginary values, lhs and rhs, and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#complex

Example:

%result = mhlo.complex %lhs, %rhs : tensor<2xcomplex<f32>>

Traits: AlwaysSpeculatableImplTrait, Elementwise, SameOperandsAndResultShape, SameOperandsElementType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`lhs`	tensor of 32-bit float or 64-bit float values
`rhs`	tensor of 32-bit float or 64-bit float values

Results:

Result	Description
`result`	tensor of complex type with 32-bit float or 64-bit float elements values

`mhlo.compute_reshape_shape` (::mlir::mhlo::ComputeReshapeShapeOp)

ComputeReshapeShape operation

Syntax:

operation ::= `mhlo.compute_reshape_shape` operands attr-dict `:` functional-type(operands, results)

This operation is a work in progress, so it is not yet included in the specification: https://github.com/openxla/stablehlo/issues/8

Informally, this operation computes an output_shape for DynamicReshapeOp from the num_elements number of elements in an operand of DynamicReshapeOp and the dynamic_shape shape provided to TF's reshape: https://www.tensorflow.org/api_docs/python/tf/reshape

For example, for num_elements = 12 and dynamic_shape = [2, -1], the result is going to be [2, 6]. If operands are not valid (e.g. if dimensions do not evenly divide the number of elements, or if there are multiple -1 values in dimensions), this leads to undefined behavior.

Example:

%result = mhlo.compute_reshape_shape %num_elements, %dynamic_shape
       : (index, tensor<2xi32>) -> tensor<2xi32>

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`num_elements`	index
`dynamic_shape`	1D tensor of integer or index values

Results:

Result	Description
`result`	1D tensor of integer or index values

`mhlo.concatenate` (::mlir::mhlo::ConcatenateOp)

Concatenate operation

Concatenates a variadic number of tensors in inputs along dimension dimension in the same order as the given arguments and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#concatenate

Example:

%result = mhlo.concatenate %input0, %input1, dim = 0 : (tensor<3x2xi64>, tensor<1x2xi64>) -> tensor<4x2xi64>

Traits: AlwaysSpeculatableImplTrait, SameOperandsAndResultElementType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`dimension`	::mlir::IntegerAttr	64-bit signless integer attribute

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.constant` (::mlir::mhlo::ConstantOp)

Constant operation

Produces an output tensor from a constant value.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#constant

Example:

%output = mhlo.constant dense<[[0.0, 1.0], [2.0, 3.0]]> : tensor<2x2xf32>

Traits: AlwaysSpeculatableImplTrait, ConstantLike

Interfaces: ConditionallySpeculatable, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`value`	::mlir::ElementsAttr	constant vector/tensor attribute

Results:

Result Description

output statically shaped tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

`mhlo.convert` (::mlir::mhlo::ConvertOp)

Convert operation

Syntax:

operation ::= `mhlo.convert` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs an element-wise conversion from one element type to another on operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#convert

Example:

%result = mhlo.convert %operand : (tensor<3xi32>) -> tensor<3xcomplex<f32>>

Traits: AlwaysSpeculatableImplTrait, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand Description

Results:

Result Description

`mhlo.convolution` (::mlir::mhlo::ConvolutionOp)

Convolution operation

Syntax:

operation ::= `mhlo.convolution` `(`operands`)`
              `dim_numbers` `=` custom<ConvolutionDimensions>($dimension_numbers) `,`
              `window` `=` `{` custom<WindowAttributes>($window_strides, $padding,
              $lhs_dilation, $rhs_dilation,
              $window_reversal) `}`
              attr-dict `:` functional-type(operands, results)

Computes dot products between windows of lhs and slices of rhs and produces result.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#convolution

Example:

%result = "mhlo.convolution"(%lhs, %rhs) {
  window_strides = dense<4> : tensor<2xi64>,
  padding = dense<0> : tensor<2x2xi64>,
  lhs_dilation = dense<2> : tensor<2xi64>,
  rhs_dilation = dense<1> : tensor<2xi64>,
  window_reversal = dense<false> : tensor<2xi1>,
  dimension_numbers = #mhlo.conv<[b, 0, 1, f]x[0, 1, i, o]->[b, 0, 1, f]>,
  feature_group_count = 1 : i64,
  batch_group_count = 1 : i64,
  precision_config = [#stablehlo<precision DEFAULT>, #stablehlo<precision DEFAULT>]
} : (tensor<1x4x4x1xi32>, tensor<3x3x1x1xi32>) -> tensor<1x2x2x1xi32>

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`window_strides`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`padding`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`lhs_dilation`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`rhs_dilation`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`window_reversal`	::mlir::DenseElementsAttr	constant boolean vector/tensor attribute
`dimension_numbers`	::mlir::mhlo::ConvDimensionNumbersAttr	Structure of dimension information for conv op
`feature_group_count`	::mlir::IntegerAttr	64-bit signless integer attribute
`batch_group_count`	::mlir::IntegerAttr	64-bit signless integer attribute
`precision_config`	::mlir::ArrayAttr	Precision Config attribute

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.copy` (::mlir::mhlo::CopyOp)

Copy operation

Syntax:

operation ::= `mhlo.copy` operands attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

This operation is private to the XLA compiler, so it is does not yet have a specification.

Informally, this operation a copy of operand. Depending on the metadata attached to the operation, it can behave quite differently from a no-op.

Example:

%0 = mhlo.copy %arg0 : tensor<f32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`cross_program_prefetch_index`	::mlir::IntegerAttr	32-bit signless integer attribute

Operands:

Operand Description

operand tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token or nested tuple with any combination of tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token values

Results:

Result Description

result tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token or nested tuple with any combination of tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token values

`mhlo.cosine` (::mlir::mhlo::CosineOp)

Cosine operation

Syntax:

operation ::= `mhlo.cosine` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise cosine operation on operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#cosine

Example:

%result = mhlo.cosine %operand : tensor<2xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.create_token` (::mlir::mhlo::CreateTokenOp)

CreateToken operation

Syntax:

operation ::= `mhlo.create_token` attr-dict `:` type(results)

This operation is on its way out of StableHLO, so it is not included in the specification: https://github.com/openxla/stablehlo/issues/3

Informally, this operation does the same thing as AfterAllOp with 0 inputs: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#after_all

Example:

%output = mhlo.create_token : !mhlo.token

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Results:

Result	Description
`output`	token

`mhlo.cross-replica-sum` (::mlir::mhlo::CrossReplicaSumOp)

CrossReplicaSum operation

This operation is on its way out of StableHLO, so it is not included in the specification: https://github.com/openxla/stablehlo/issues/3

Informally, this operation does the same thing as AllReduceOp with channel_id = 0, use_global_device_ids = false and computation implementing addition: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#all_reduce

Example:

%result = "mhlo.cross-replica-sum"(%operand) {
  replica_groups = dense<[[0, 1]]> : tensor<1x2xi64>
} : (tensor<4xf32>) -> tensor<4xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`replica_groups`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.cstr_reshapable` (::mlir::mhlo::CstrReshapableOp)

CstrReshapable operation

Syntax:

operation ::= `mhlo.cstr_reshapable` operands attr-dict `:` functional-type(operands, results)

This operation is a work in progress, so it is not yet included in the specification: https://github.com/openxla/stablehlo/issues/8

Informally, this operation creates a witness on the constraint that ComputeReshapeShape would succeed with the provided operands.

Example:

%result = mhlo.cstr_reshapable %num_elements, %dynamic_shape
       : (index, tensor<3xi32>) -> !shape.witness

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`num_elements`	index
`dynamic_shape`	1D tensor of integer or index values

Results:

Result	Description
`result`

`mhlo.custom_call` (::mlir::mhlo::CustomCallOp)

CustomCall operation

Syntax:

operation ::= `mhlo.custom_call` custom<CustomCallTarget>($call_target_name) `(` $inputs `)`
              attr-dict `:` functional-type(operands, results)

Encapsulates an implementation-defined operation call_target_name that takes inputs and called_computations and produces results.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#custom_call

Example:

%results = "mhlo.custom_call"(%input0) {
  call_target_name = "foo",
  has_side_effect = false,
  backend_config = "bar",
  api_version = 1 : i32,
  called_computations = [@foo]
} : (tensor<f32>) -> tensor<f32>

A custom call invokes code external to XLA. The `inputs` are passed to the
external code, and the external code is expected to produce a result of the
given type. The exact mechanism is backend-specific. For example, in the CPU
backend, a call instruction is emitted which targets a symbol with the name
`call_target_name`.

If XLA runtime is enabled for a backend, then custom calls use the runtime
custom call calling convention to call into the external functions. This
calling convention defines an ABI for encoding arguments, attributes and
results.

Depending on the API version there are two ways to pass extra bits of static
information to the external function:

1. For `API_VERSION_TYPED_FFI` custom calls `backend_config` must be a
   dictionary attribute, that will be encoded according to the custom call
   calling convention and passed to the external function as the attributes
   argument. External code is expected to use declarative bindings (see
   `xla/runtime/custom_call.h`) to decode them at run time. These custom
   calls are only supported if XLA uses XLA runtime.

2. For previous API versions it is the user responsibility to encode extra
   bits of static information as a string `backend_config` attribute, and
   decode it at run time.

Interfaces: MemoryEffectOpInterface

Attributes:

Attribute	MLIR Type	Description
`call_target_name`	::mlir::StringAttr	string attribute
`has_side_effect`	::mlir::BoolAttr	bool attribute
`backend_config`	::mlir::Attribute	string attribute or dictionary of named attribute values
`api_version`	::mlir::mhlo::CustomCallApiVersionAttr	Custom call API version
`called_computations`	::mlir::ArrayAttr	flat symbol ref array attribute
`custom_call_schedule`	::mlir::mhlo::CustomCallScheduleAttr	Specifies the desired schedule for the custom-call.
`operand_layouts`	::mlir::ArrayAttr	Array of layout (1D tensor of index type) attributes
`result_layouts`	::mlir::ArrayAttr	Array of layout (1D tensor of index type) attributes
`output_operand_aliases`	::mlir::ArrayAttr	Aliasing attribute for outputs and operands of CustomCall

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.divide` (::mlir::mhlo::DivOp)

Div operation

Syntax:

operation ::= `mhlo.divide` $lhs `,` $rhs attr-dict
              `:` custom<SameOperandsAndResultType>(type($lhs), type($rhs), type($result))

Performs element-wise division of dividend lhs and divisor rhs tensors and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#divide

Example:

%result = mhlo.divide %lhs, %rhs : tensor<4xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`lhs`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values
`rhs`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.domain` (::mlir::mhlo::DomainOp)

Domain operation

This operation is private to the XLA compiler, so it is does not yet have a specification.

Informally, these operations are used to group instructions with the same DomainMetadata property. ShardingMetadata is the main use case today to group instructions on the same device. Domain instructions provide two major benefits:

Prevent unintentionally optimizing instructions across domains.
Automatically assign the metadata of the instructions created in the domain. Without domain instructions, each HLO optimization pass would have to check and propagate the metadata, which would be easy to miss and also adds complexity to the compiler. Since domain instructions connect two different domains, each domain instruction is associated with two DomainMetadata -- one on the operand side and one on the user side of the domain.

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`kind`	::mlir::mhlo::DomainKindAttr	Kind of domain metatdata attached to an HLO domain.
`entry_metadata`	::mlir::StringAttr	string attribute
`exit_metadata`	::mlir::StringAttr	string attribute

Operands:

Operand Description

Results:

Result Description

`mhlo.dot_general` (::mlir::mhlo::DotGeneralOp)

DotGeneral operation

Computes dot products between slices of lhs and slices of rhs and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#dot_general

Example:

%result = "mhlo.dot_general"(%lhs, %rhs) {
  dot_dimension_numbers = #mhlo.dot<
    lhs_batching_dimensions = [0],
    rhs_batching_dimensions = [0],
    lhs_contracting_dimensions = [2],
    rhs_contracting_dimensions = [1]
  >,
  precision_config = [#stablehlo<precision DEFAULT>, #stablehlo<precision DEFAULT>]
} : (tensor<2x2x2xi32>, tensor<2x2x2xi32>) -> tensor<2x2x2xi32>

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`dot_dimension_numbers`	::mlir::mhlo::DotDimensionNumbersAttr	Attribute that models the dimension information for dot.
`precision_config`	::mlir::ArrayAttr	Precision Config attribute

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.dot` (::mlir::mhlo::DotOp)

Dot operation

This operation is on its way out of StableHLO, so it is not included in the specification: https://github.com/openxla/stablehlo/issues/3

Informally, this operation does the same thing as XLA's Dot: https://www.tensorflow.org/xla/operation_semantics#dot

Example:

%0 = mhlo.dot %arg0, %arg1 : (tensor<1x2xi32>, tensor<2x1xi32>) -> tensor<1x1xi32>

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`precision_config`	::mlir::ArrayAttr	Precision Config attribute

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.dynamic_broadcast_in_dim` (::mlir::mhlo::DynamicBroadcastInDimOp)

DynamicBroadcastInDim operation

This operation is a work in progress, so it is not yet included in the specification: https://github.com/openxla/stablehlo/issues/8

Informally, this operation does the same thing as BroadcastInDimOp except that the result shape is specified dynamically via output_dimensions: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#broadcast_in_dim

It also accepts optional attributes to express static knowledge about the expanding behavior of dimensions. If not specified, all dimensions are assumed to be possibly expanding. The sets of dimensions that are known to be expanding and the set of dimensions that are known to be non-expanding must be disjoint and they must be a subset of the operand's dimensions.

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`broadcast_dimensions`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`known_expanding_dimensions`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`known_nonexpanding_dimensions`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute

Operands:

Operand Description

output_dimensions 1D tensor of index or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result

Description

«unnamed»

`mhlo.dynamic_conv` (::mlir::mhlo::DynamicConvOp)

DynamicConv operation

This operation is a work in progress, so it is not yet included in the specification: https://github.com/openxla/stablehlo/issues/8

Informally, this operation does the same thing as ConvolutionOp except that padding is specified dynamically via d_padding: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#convolution

Example:

%result = "mhlo.dynamic_conv"(%lhs, %rhs, %d_padding) {
  window_strides = dense<4> : tensor<2xi64>,
  lhs_dilation = dense<2> : tensor<2xi64>,
  rhs_dilation = dense<1> : tensor<2xi64>,
  window_reversal = dense<false> : tensor<2xi1>,
  dimension_numbers = #mhlo.conv<[b, 0, 1, f]x[0, 1, i, o]->[b, 0, 1, f]>,
  feature_group_count = 1 : i64,
  batch_group_count = 1 : i64,
  precision_config = [#stablehlo<precision DEFAULT>, #stablehlo<precision DEFAULT>]
} : (tensor<1x4x4x1xi32>, tensor<3x3x1x1xi32>, tensor<2x2xi64>) -> tensor<1x2x2x1xi32>

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`window_strides`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`padding`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`lhs_dilation`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`rhs_dilation`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`window_reversal`	::mlir::DenseElementsAttr	constant boolean vector/tensor attribute
`dimension_numbers`	::mlir::mhlo::ConvDimensionNumbersAttr	Structure of dimension information for conv op
`feature_group_count`	::mlir::IntegerAttr	64-bit signless integer attribute
`batch_group_count`	::mlir::IntegerAttr	64-bit signless integer attribute
`precision_config`	::mlir::ArrayAttr	Precision Config attribute

Operands:

Operand	Description
`lhs`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values
`rhs`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values
`d_padding`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

Results:

Result

Description

«unnamed»

`mhlo.dynamic_gather` (::mlir::mhlo::DynamicGatherOp)

DynamicGather operation

This operation is a work in progress, so it is not yet included in the specification: https://github.com/openxla/stablehlo/issues/8

Informally, this operation does the same thing as GatherOp except that slice_sizes are specified dynamically: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#gather

Example:

%result = "mhlo.dynamic_gather"(%operand, %start_indices, %slice_sizes) {
  dimension_numbers = #mhlo.gather<
    offset_dims = [2, 3],
    collapsed_slice_dims = [0],
    start_index_map = [0, 2],
    index_vector_dim = 2>,
  indices_are_sorted = false
} : (tensor<3x4x2xi32>, tensor<2x3x2xi64>, tensor<3xi64>) -> tensor<2x3x2x2xi32>

Traits: AlwaysSpeculatableImplTrait, InferTensorType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`dimension_numbers`	::mlir::mhlo::GatherDimensionNumbersAttr	Attribute that models the dimension information for gather
`indices_are_sorted`	::mlir::BoolAttr	bool attribute

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values
`start_indices`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values
`slice_sizes`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result

Description

«unnamed»

`mhlo.dynamic_iota` (::mlir::mhlo::DynamicIotaOp)

DynamicIota operation

This operation is a work in progress, so it is not yet included in the specification: https://github.com/openxla/stablehlo/issues/8

Informally, this operation does the same thing as IotaOp except that the result shape is specified dynamically via output_shape: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#iota

Example:

%0 = mhlo.dynamic_iota %arg0, dim = 0 : (tensor<1xindex>) -> tensor<4xi32>

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`iota_dimension`	::mlir::IntegerAttr	64-bit signless integer attribute

Operands:

Operand	Description
`output_shape`	1D tensor of index or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result Description

`mhlo.dynamic_pad` (::mlir::mhlo::DynamicPadOp)

DynamicPad operation

Syntax:

operation ::= `mhlo.dynamic_pad` operands attr-dict `:` functional-type(operands, results)

Dynamically Pads the operand, with amount of padding added at low-end/high-end/interior is passed through input tensors.

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values
`padding_value`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values
`edge_padding_low`	1D tensor of index or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values
`edge_padding_high`	1D tensor of index or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values
`interior_padding`	1D tensor of index or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result Description

`mhlo.dynamic_reshape` (::mlir::mhlo::DynamicReshapeOp)

DynamicReshape operation

Syntax:

operation ::= `mhlo.dynamic_reshape` operands attr-dict `:` functional-type(operands, results)

This operation is a work in progress, so it is not yet included in the specification: https://github.com/openxla/stablehlo/issues/8

Informally, this operation does the same thing as ReshapeOp except that the result shape is specified dynamically via output_shape: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#reshape

Example:

%0 = mhlo.dynamic_reshape %arg0, %shape : (tensor<?xf32>, tensor<2xindex>) -> tensor<?x?xf32>

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand Description

output_shape 1D tensor of index or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result Description

`mhlo.dynamic_slice` (::mlir::mhlo::DynamicSliceOp)

DynamicSlice operation

Extracts a slice from the operand using dynamically-computed starting indices and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#dynamic_slice

Example:

%result = mhlo.dynamic_slice %operand, %start_indices0, %start_indices1, sizes = [2, 2]
  : (tensor<4x4xi32>, tensor<i64>, tensor<i64>) -> tensor<2x2xi32>

Traits: AlwaysSpeculatableImplTrait, InferTensorType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`slice_sizes`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute

Operands:

Operand Description

start_indices 0D tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result Description

`mhlo.dynamic_update_slice` (::mlir::mhlo::DynamicUpdateSliceOp)

DynamicUpdateSlice operation

Syntax:

operation ::= `mhlo.dynamic_update_slice` operands attr-dict `:` functional-type(operands, results)

Produces a result tensor which is equal to the operand tensor except that the slice starting at start_indices is updated with the values in update.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#dynamic_update_slice

Example:

%result = mhlo.dynamic_update_slice %operand, %update, %start_indices0, %start_indices1
  : (tensor<4x4xi32>, tensor<2x2xi32>, tensor<i64>, tensor<i64>) -> tensor<4x4xi32>

Traits: AlwaysSpeculatableImplTrait, InferTensorType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values
`update`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values
`start_indices`	0D tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result Description

`mhlo.einsum` (::mlir::mhlo::EinsumOp)

Einsum operation

This operation is on its way out of StableHLO, so it is not included in the specification: https://github.com/openxla/stablehlo/issues/3

Informally, this operation does the same thing as TF's einsum: https://www.tensorflow.org/api_docs/python/tf/einsum

Example:

%result = "mhlo.einsum"(%lhs, %rhs) {
  einsum_config = "ab,bc->ac"
} : (tensor<4x16xf32>, tensor<16x4xf32>) -> tensor<4x4xf32>

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`einsum_config`	::mlir::StringAttr	string attribute

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.exponential` (::mlir::mhlo::ExpOp)

Exp operation

Syntax:

operation ::= `mhlo.exponential` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise exponential operation on operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#exponential

Example:

%result = mhlo.exponential %operand : tensor<2x2xf64>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.exponential_minus_one` (::mlir::mhlo::Expm1Op)

Expm1 operation

Syntax:

operation ::= `mhlo.exponential_minus_one` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise exponential minus one operation on operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#exponential_minus_one

Example:

%result = mhlo.exponential_minus_one %operand : tensor<2xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.fft` (::mlir::mhlo::FftOp)

Fft operation

Performs the forward and inverse Fourier transforms for real and complex inputs/outputs.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#fft

Example:

%result = mhlo.fft %operand, type = FFT, length = [4] : (tensor<4xcomplex<f32>>) -> tensor<4xcomplex<f32>>

Traits: AlwaysSpeculatableImplTrait, InferTensorType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`fft_type`	::mlir::mhlo::FftTypeAttr	XLA fast fourier transform type.
`fft_length`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.floor` (::mlir::mhlo::FloorOp)

Floor operation

Syntax:

operation ::= `mhlo.floor` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise floor of operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#floor

Example:

%result = mhlo.floor %operand : tensor<2xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

`mhlo.fusion` (::mlir::mhlo::FusionOp)

Fusion operation

This operation is private to the XLA compiler, so it is does not yet have a specification.

Informally, this operation consists of a group of basic ops (represented as a region attached to it). It serves as a hint to the backend that it is beneficial to emit the contained ops into a single loop nest or kernel.

Attributes:

Attribute	MLIR Type	Description
`fusion_kind`	::mlir::mhlo::FusionKindAttr	fusion kind
`output_operand_aliases`	::mlir::ArrayAttr	Aliasing attribute for outputs and operands of Fusion

Operands:

Operand Description

Results:

Result Description

results tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or nested tuple with any combination of tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token values

`mhlo.gather` (::mlir::mhlo::GatherOp)

Gather operation

Gathers slices from operand tensor from offsets specified in start_indices and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#gather

Example:

%result = "mhlo.gather"(%operand, %start_indices) {
  dimension_numbers = #mhlo.gather<
    offset_dims = [2, 3],
    collapsed_slice_dims = [0],
    start_index_map = [0, 2],
    index_vector_dim = 2>,
  slice_sizes = dense<[0, 2, 2]> : tensor<3xi64>,
  indices_are_sorted = false
} : (tensor<3x4x2xi32>, tensor<2x3x2xi64>) -> tensor<2x3x2x2xi32>

Traits: AlwaysSpeculatableImplTrait, InferTensorType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`dimension_numbers`	::mlir::mhlo::GatherDimensionNumbersAttr	Attribute that models the dimension information for gather
`slice_sizes`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`indices_are_sorted`	::mlir::BoolAttr	bool attribute

Operands:

Operand Description

start_indices tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result

Description

«unnamed»

`mhlo.get_dimension_size` (::mlir::mhlo::GetDimensionSizeOp)

GetDimensionSize operation

Produces the size of the given dimension of the operand.

See https://github.com/openxla/stablehlo/blob/main/docs/spec.md#get_dimension_size

Example:

%result = mhlo.get_dimension_size %operand, dim = 1 : (tensor<2x3xf32>) -> tensor<i32>

Traits: AlwaysSpeculatableImplTrait, InferTensorType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`dimension`	::mlir::IntegerAttr	64-bit signless integer attribute

Operands:

Operand Description

Results:

Result	Description
«unnamed»	tensor of 32-bit signless integer values

`mhlo.get_tuple_element` (::mlir::mhlo::GetTupleElementOp)

GetTupleElement operation

Syntax:

operation ::= `mhlo.get_tuple_element` $operand `[` $index `]` attr-dict `:` functional-type(operands, results)

Extracts element at index position of the operand tuple and produces a result.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#get_tuple_element

Example:

%result = mhlo.get_tuple_element %operand[0] : (tuple<tensor<2xf32>, tuple<tensor<i32>>>) -> tensor<2xf32>

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`index`	::mlir::IntegerAttr	32-bit signless integer attribute

Operands:

Operand Description

operand nested tuple with any combination of tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token values

Results:

Result

Description

«unnamed»

`mhlo.if` (::mlir::mhlo::IfOp)

If operation

Produces the output from executing exactly one branch from true_branch or false_branch depending on the value of pred.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#if

Example: %result = "mhlo.if"(%pred) ({ "mhlo.return"(%result_true_branch) : (tensor) -> () }, { "mhlo.return"(%result_false_branch) : (tensor) -> () }) : (tensor) -> tensor

Traits: RecursiveMemoryEffects, SingleBlockImplicitTerminator

Interfaces: InferTypeOpInterface

Operands:

Operand	Description
`pred`	tensor of pred (AKA boolean or 1-bit integer) values

Results:

Result

Description

«unnamed»

`mhlo.imag` (::mlir::mhlo::ImagOp)

Imag operation

Syntax:

operation ::= `mhlo.imag` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Extracts the imaginary part, element-wise, from the operand and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#imag

Example:

%result = mhlo.imag %operand : (tensor<2xcomplex<f32>>) -> tensor<2xf32>

Traits: AlwaysSpeculatableImplTrait, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

`mhlo.infeed` (::mlir::mhlo::InfeedOp)

Infeed operation

Reads data from the infeed and produces results.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#infeed

Example:

%results:2 = "mhlo.infeed"(%token) {
  infeed_config = ""
} : (!mhlo.token) -> (tensor<3x3x3xi32>, !mhlo.token)

Attributes:

Attribute	MLIR Type	Description
`infeed_config`	::mlir::StringAttr	string attribute
`layout`	::mlir::ArrayAttr	array attribute

Operands:

Operand	Description
`token`	token

Results:

Result

Description

«unnamed»

`mhlo.iota` (::mlir::mhlo::IotaOp)

Iota operation

Fills an output tensor with values in increasing order starting from zero along the iota_dimension dimension.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#iota

Example:

%output = mhlo.iota dim = 0 : tensor<4x5xi32>

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`iota_dimension`	::mlir::IntegerAttr	64-bit signless integer attribute

Results:

Result	Description
`output`	statically shaped tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.is_finite` (::mlir::mhlo::IsFiniteOp)

IsFinite operation

Syntax:

operation ::= `mhlo.is_finite` $x attr-dict `:` functional-type(operands, results)

Performs element-wise check whether the value in x is finite (i.e. is neither +Inf, -Inf, nor NaN) and produces a y tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#is_finite

Example:

%y = mhlo.is_finite %x : (tensor<7xf32>) -> tensor<7xi1>

Traits: AlwaysSpeculatableImplTrait, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`x`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

Results:

Result	Description
`y`	tensor of pred (AKA boolean or 1-bit integer) values

`mhlo.log_plus_one` (::mlir::mhlo::Log1pOp)

Log1p operation

Syntax:

operation ::= `mhlo.log_plus_one` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise logarithm plus one operation on operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#log_plus_one

Example:

%result = mhlo.log_plus_one %operand : tensor<6xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.log` (::mlir::mhlo::LogOp)

Log operation

Syntax:

operation ::= `mhlo.log` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise logarithm operation on operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#log

Example:

%result = mhlo.log %operand : tensor<2x2xf64>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.logistic` (::mlir::mhlo::LogisticOp)

Logistic operation

Syntax:

operation ::= `mhlo.logistic` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise logistic operation on operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#logistic

Example:

%result = mhlo.logistic %operand : tensor<2x2xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.map` (::mlir::mhlo::MapOp)

Map operation

Applies a map function computation to inputs along the dimensions and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#map

Example:

%result = "mhlo.map"(%input0, %input1) ({
  ^bb0(%arg0: tensor<i32>, %arg1: tensor<i32>):
    %0 = mhlo.multiply %arg0, %arg1 : tensor<i32>
    mhlo.return %0 : tensor<i32>
}) {
  dimensions = dense<[0, 1]> : tensor<2xi64>
} : (tensor<2x2xi32>, tensor<2x2xi32>) -> tensor<2x2xi32>

Traits: InferTensorType, RecursiveMemoryEffects, SameOperandsAndResultShape, SingleBlockImplicitTerminator

Interfaces: InferShapedTypeOpInterface, InferTypeOpInterface

Attributes:

Attribute	MLIR Type	Description
`dimensions`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.maximum` (::mlir::mhlo::MaxOp)

Max operation

Syntax:

operation ::= `mhlo.maximum` $lhs `,` $rhs attr-dict
              `:` custom<SameOperandsAndResultType>(type($lhs), type($rhs), type($result))

Performs element-wise max operation on tensors lhs and rhs and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#maximum

Example:

%result = mhlo.maximum %lhs, %rhs : tensor<4xf32>

Traits: AlwaysSpeculatableImplTrait, Commutative, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand Description

Results:

Result Description

`mhlo.minimum` (::mlir::mhlo::MinOp)

Min operation

Syntax:

operation ::= `mhlo.minimum` $lhs `,` $rhs attr-dict
              `:` custom<SameOperandsAndResultType>(type($lhs), type($rhs), type($result))

Performs element-wise min operation on tensors lhs and rhs and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#minimum

Example:

%result = mhlo.minimum %lhs, %rhs : tensor<4xf32>

Traits: AlwaysSpeculatableImplTrait, Commutative, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand Description

Results:

Result Description

`mhlo.multiply` (::mlir::mhlo::MulOp)

Mul operation

Syntax:

operation ::= `mhlo.multiply` $lhs `,` $rhs attr-dict
              `:` custom<SameOperandsAndResultType>(type($lhs), type($rhs), type($result))

Performs element-wise product of two tensors lhs and rhs and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#multiply

Example:

%result = mhlo.multiply %lhs, %rhs : tensor<2xi32>

Traits: AlwaysSpeculatableImplTrait, Commutative, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand Description

Results:

Result Description

`mhlo.negate` (::mlir::mhlo::NegOp)

Neg operation

Syntax:

operation ::= `mhlo.negate` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise negation of operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#negate

Example:

%result = mhlo.negate %operand : tensor<2x3xi32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.not` (::mlir::mhlo::NotOp)

Not operation

Syntax:

operation ::= `mhlo.not` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise NOT of tensor operand of type integer and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#not

Example:

%result = mhlo.not %operand : tensor<5x3x1xi1>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result	Description
`result`	tensor of pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

`mhlo.optimization_barrier` (::mlir::mhlo::OptimizationBarrierOp)

OptimizationBarrier operation

Syntax:

operation ::= `mhlo.optimization_barrier` attr-dict ($operand^ `:` custom<PairwiseOpType>(type($operand), type($result))):(`(` `)`)?

Ensures that the operations that produce the operand are executed before any operations that depend on the result and prevents compiler transformations from moving operations across the barrier. Other than that, the operation is an identity, i.e. result = operand.

See https://github.com/openxla/stablehlo/blob/main/docs/spec.md#optimization_barrier

Example:

%result0, %result1 = mhlo.optimization_barrier %operand0, %operand1 : tensor<f32>, tensor<f32>

Traits: AlwaysSpeculatableImplTrait, HLO_PairwiseSameOperandAndResultType

Interfaces: ConditionallySpeculatable, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand Description

Results:

Result Description

`mhlo.or` (::mlir::mhlo::OrOp)

Or operation

Syntax:

operation ::= `mhlo.or` $lhs `,` $rhs attr-dict
              `:` custom<SameOperandsAndResultType>(type($lhs), type($rhs), type($result))

Performs element-wise OR of two tensors lhs and rhs and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#or

Example:

%result = mhlo.or %lhs, %rhs : tensor<2xi1>

Traits: AlwaysSpeculatableImplTrait, Commutative, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`lhs`	tensor of pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values
`rhs`	tensor of pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result Description

`mhlo.outfeed` (::mlir::mhlo::OutfeedOp)

Outfeed operation

Writes inputs to the outfeed and produces a result token.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#outfeed

Example:

%result = "mhlo.outfeed"(%input0, %token) {
  outfeed_config = ""
} : (tensor<3x3x3xi32>, !mhlo.token) -> !mhlo.token

Interfaces: InferTypeOpInterface

Attributes:

Attribute	MLIR Type	Description
`outfeed_config`	::mlir::StringAttr	string attribute

Operands:

Operand Description

token token

Results:

Result	Description
«unnamed»	token

`mhlo.pad` (::mlir::mhlo::PadOp)

Pad operation

Expands operand by padding around the tensor as well as between the elements of the tensor with the given padding_value.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#pad

Example:

%0 = mhlo.pad %arg0, %arg1, low = [0, 1], high = [2, 1], interior = [1, 2]
  : (tensor<2x3xi32>, tensor<i32>) -> tensor<5x9xi32>

Traits: AlwaysSpeculatableImplTrait, SameOperandsAndResultElementType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`edge_padding_low`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`edge_padding_high`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`interior_padding`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute

Operands:

Operand Description

padding_value tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

Results:

Result

Description

«unnamed»

`mhlo.partition_id` (::mlir::mhlo::PartitionIdOp)

PartitionId operation

Syntax:

operation ::= `mhlo.partition_id` attr-dict `:` type(results)

Produces partition_id of the current process.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#partition_id

Example:

%result = mhlo.partition_id : tensor<ui32>

Interfaces: InferTypeOpInterface

Results:

Result	Description
«unnamed»	tensor of 32-bit unsigned integer values

`mhlo.popcnt` (::mlir::mhlo::PopulationCountOp)

PopulationCount operation

Syntax:

operation ::= `mhlo.popcnt` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise count of the number of bits set in the operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#popcnt

Example:

%result = mhlo.popcnt %operand : tensor<4xi8>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result	Description
`result`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

`mhlo.power` (::mlir::mhlo::PowOp)

Pow operation

Syntax:

operation ::= `mhlo.power` $lhs `,` $rhs attr-dict
              `:` custom<SameOperandsAndResultType>(type($lhs), type($rhs), type($result))

Performs element-wise exponentiation of lhs tensor by rhs tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#power

Example:

%result = mhlo.power %lhs, %rhs : tensor<6xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`lhs`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values
`rhs`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.real_dynamic_slice` (::mlir::mhlo::RealDynamicSliceOp)

RealDynamicSlice operation

Syntax:

operation ::= `mhlo.real_dynamic_slice` operands attr-dict `:` functional-type(operands, results)

This operation is a work in progress, so it is not yet included in the specification: https://github.com/openxla/stablehlo/issues/8

Informally, this operation does the same thing as SliceOp except that start_indices, limit_indices and strides are specified dynamically: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#slice

Example:

%result = mhlo.real_dynamic_slice %operand,
            %start_indices, %limit_indices, %strides
       : (tensor<256x?xf32>, tensor<2xindex>, tensor<2xindex>, tensor<2xindex>) -> tensor<256x?xf32>

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values
`start_indices`	1D tensor of index or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values
`limit_indices`	1D tensor of index or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values
`strides`	1D tensor of index or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result Description

`mhlo.real` (::mlir::mhlo::RealOp)

Real operation

Syntax:

operation ::= `mhlo.real` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Extracts the real part, element-wise, from the operand and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#real

Example:

%result = mhlo.real %operand : (tensor<2xcomplex<f32>>) -> tensor<2xf32>

Traits: AlwaysSpeculatableImplTrait, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

`mhlo.recv` (::mlir::mhlo::RecvOp)

Recv operation

Receives data from a channel with channel_id and produces results.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#recv

Example:

%results:2 = "mhlo.recv"(%token) {
  // channel_id = 5 : i64,
  // channel_type = #stablehlo<channel_type HOST_TO_DEVICE>,
  channel_handle = #mhlo.channel_handle<handle = 5, type = 3>,
  is_host_transfer = true
} : (!mhlo.token) -> (tensor<3x4xi32>, !mhlo.token)

Attributes:

Attribute	MLIR Type	Description
`channel_handle`	::mlir::mhlo::ChannelHandleAttr	two 64-bit integers 'handle' and 'type'
`is_host_transfer`	::mlir::BoolAttr	bool attribute

Operands:

Operand	Description
`token`	token

Results:

Result

Description

«unnamed»

`mhlo.reduce` (::mlir::mhlo::ReduceOp)

Reduce operation

Applies a reduction function body to inputs and init_values along the dimensions and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#reduce

Example:

%result = "mhlo.reduce"(%input, %init_value) ({
  ^bb0(%arg0: tensor<i32>, %arg1: tensor<i32>):
    %0 = "mhlo.add"(%arg0, %arg1) : (tensor<i32>, tensor<i32>) -> tensor<i32>
    "mhlo.return"(%0) : (tensor<i32>) -> ()
}) {
  dimensions = dense<1> : tensor<1xi64>
} : (tensor<1x6xi32>, tensor<i32>) -> tensor<1xi32>

Traits: InferTensorType, RecursiveMemoryEffects, SameVariadicOperandSize, SingleBlockImplicitTerminator

Interfaces: InferShapedTypeOpInterface, InferTypeOpInterface

Attributes:

Attribute	MLIR Type	Description
`dimensions`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute

Operands:

Operand Description

init_values tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

Results:

Result

Description

«unnamed»

`mhlo.reduce_precision` (::mlir::mhlo::ReducePrecisionOp)

ReducePrecision operation

Syntax:

operation ::= `mhlo.reduce_precision` $operand `,` `format` `=` custom<ExponentMantissa>($exponent_bits, $mantissa_bits)
              attr-dict `:` custom<SameOperandsAndResultType>(type($operand), type($output))

Performs element-wise conversion of operand to another floating-point type that uses exponent_bits and mantissa_bits and back to the original floating-point type and produces an output tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#reduce_precision

Example:

%output = mhlo.reduce_precision %operand, format = e5m2 : tensor<6xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`exponent_bits`	::mlir::IntegerAttr	32-bit signless integer attribute
`mantissa_bits`	::mlir::IntegerAttr	32-bit signless integer attribute

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

Results:

Result	Description
`output`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

`mhlo.reduce_scatter` (::mlir::mhlo::ReduceScatterOp)

ReduceScatter operation

Within each process group in the process grid, performs reduction, using computations, over the values of the operand tensor from each process, splits the reduction result along scatter_dimension into parts, and scatters the split parts between the processes to produce the result.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#reduce_scatter

Example:

%result = "mhlo.reduce_scatter"(%operand) ({
  ^bb0(%arg0: tensor<f32>, %arg1: tensor<f32>):
  %0 = mhlo.add %arg0, %arg1 : tensor<f32>
  mhlo.return %0 : tensor<f32>
}) {
  scatter_dimension = 1 : i64,
  replica_groups = dense<[[0, 1]]> : tensor<1x2xi64>,
  // channel_id = 0
  channel_handle = #mhlo.channel_handle<handle = 0, type = 0>
  // use_global_device_ids = false
} : (tensor<2x4xf32>) -> tensor<2x2xf32>

Traits: SameOperandsAndResultElementType

Attributes:

Attribute	MLIR Type	Description
`scatter_dimension`	::mlir::IntegerAttr	64-bit signless integer attribute
`replica_groups`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`channel_handle`	::mlir::mhlo::ChannelHandleAttr	two 64-bit integers 'handle' and 'type'
`use_global_device_ids`	::mlir::UnitAttr	unit attribute

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.reduce_window` (::mlir::mhlo::ReduceWindowOp)

ReduceWindow operation

Applies a reduction function body to windows of inputs and init_values and produces results.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#reduce_window

Example:

%result = "mhlo.reduce_window"(%input, %init_value) ({
  ^bb0(%arg0: tensor<i32>, %arg1: tensor<i32>):
    %0 = mhlo.add %arg0, %arg1 : tensor<i32>
    mhlo.return %0 : tensor<i32>
}) {
  window_dimensions = dense<[2, 1]> : tensor<2xi64>,
  window_strides = dense<[4, 1]> : tensor<2xi64>,
  base_dilations = dense<[2, 1]> : tensor<2xi64>,
  window_dilations = dense<[3, 1]> : tensor<2xi64>,
  padding = dense<[[2, 1], [0, 0]]> : tensor<2x2xi64>
} : (tensor<3x2xi32>, tensor<i32>) -> tensor<2x2xi32>

Traits: InferTensorType, RecursiveMemoryEffects, SameVariadicOperandSize, SingleBlockImplicitTerminator

Interfaces: InferShapedTypeOpInterface, InferTypeOpInterface

Attributes:

Attribute	MLIR Type	Description
`window_dimensions`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`window_strides`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`base_dilations`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`window_dilations`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`padding`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.remainder` (::mlir::mhlo::RemOp)

Rem operation

Syntax:

operation ::= `mhlo.remainder` $lhs `,` $rhs attr-dict
              `:` custom<SameOperandsAndResultType>(type($lhs), type($rhs), type($result))

Performs element-wise remainder of dividend lhs and divisor rhs tensors and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#remainder

Example:

%result = mhlo.remainder %lhs, %rhs : tensor<4xi64>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`lhs`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values
`rhs`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.replica_id` (::mlir::mhlo::ReplicaIdOp)

ReplicaId operation

Syntax:

operation ::= `mhlo.replica_id` attr-dict `:` type(results)

Produces replica_id of the current process.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#replica_id

Example:

%result = mhlo.replica_id : tensor<ui32>

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Results:

Result	Description
«unnamed»	tensor of 32-bit unsigned integer values

`mhlo.reshape` (::mlir::mhlo::ReshapeOp)

Reshape operation

Syntax:

operation ::= `mhlo.reshape` operands attr-dict `:` functional-type(operands, results)

Performs reshape of operand tensor to a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#reshape

Example:

%result = mhlo.reshape %operand : (tensor<2xf32>) -> tensor<1x2xf32>

Traits: AlwaysSpeculatableImplTrait, SameOperandsAndResultElementType

Interfaces: ConditionallySpeculatable, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.return` (::mlir::mhlo::ReturnOp)

This operation is a work in progress, so it is not yet included in
the specification: <a href="https://github.com/openxla/stablehlo/issues/425">https://github.com/openxla/stablehlo/issues/425</a>

Informally, this operation serves as a terminator for regions defined by
the StableHLO ops. Non-StableHLO ops, e.g. `func.func`, have their own
terminators, e.g. `func.return`.

Example:

```mlir
%result = "mhlo.reduce"(%input, %init_value) ({
  ^bb0(%arg0: tensor<i32>, %arg1: tensor<i32>):
    %0 = "mhlo.add"(%arg0, %arg1) : (tensor<i32>, tensor<i32>) -> tensor<i32>
    "mhlo.return"(%0) : (tensor<i32>) -> ()
}) {
  dimensions = dense<1> : tensor<1xi64>
} : (tensor<1x6xi32>, tensor<i32>) -> tensor<1xi32>
```

Syntax:

operation ::= `mhlo.return` $results attr-dict (`:` type($results)^)?

Traits: AlwaysSpeculatableImplTrait, Terminator

Interfaces: ConditionallySpeculatable, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand Description

results tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token or nested tuple with any combination of tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token values

`mhlo.reverse` (::mlir::mhlo::ReverseOp)

Reverse operation

Reverses the order of elements in the operand along the specified dimensions and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#reverse

Example:

%result = mhlo.reverse %operand, dims = [1] : tensor<3x2xi32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`dimensions`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.rng_bit_generator` (::mlir::mhlo::RngBitGeneratorOp)

RngBitGenerator operation

Returns an output filled with uniform random data and an updated output state output_state given an initial state initial_state using the pseudorandom number generator algorithm rng_algorithm.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#rng_bit_generator

Example:

%output_state, %output = mhlo.rng_bit_generator %initial_state, algorithm = THREE_FRY : (tensor<2xui64>) -> (tensor<2xui64>, tensor<2x2xui64>)

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`rng_algorithm`	::mlir::mhlo::RngAlgorithmAttr	XLA PRNG algorithm to be used.

Operands:

Operand	Description
`initial_state`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

Results:

Result	Description
`output_state`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values
`output`	statically shaped tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

`mhlo.rng` (::mlir::mhlo::RngOp)

Rng operation

Generates random numbers using the rng_distribution algorithm and produces a result tensor of a given shape shape.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#rng

Example:

%result = mhlo.rng %a, %b, %shape, distribution = NORMAL : (tensor<i32>, tensor<i32>, tensor<2xi64>) -> tensor<3x3xi32>

Traits: InferTensorType

Interfaces: InferShapedTypeOpInterface, InferTypeOpInterface

Attributes:

Attribute	MLIR Type	Description
`rng_distribution`	::mlir::mhlo::RngDistributionAttr	XLA PRNG distribution to be used.

Operands:

Operand	Description
`a`	0D tensor of pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values
`b`	0D tensor of pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values
`shape`	1D tensor of index or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result	Description
`result`	tensor of pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

`mhlo.round_nearest_even` (::mlir::mhlo::RoundNearestEvenOp)

RoundNearestEven operation

Syntax:

operation ::= `mhlo.round_nearest_even` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise rounding towards the nearest integer, breaking ties towards the even integer, on the operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#round_nearest_even

Example:

%result = mhlo.round_nearest_even %operand : tensor<5xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

`mhlo.round_nearest_afz` (::mlir::mhlo::RoundOp)

Round operation

Syntax:

operation ::= `mhlo.round_nearest_afz` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise rounding towards the nearest integer, breaking ties away from zero, on the operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#round_nearest_afz

Example:

%result = mhlo.round_nearest_afz %operand : tensor<5xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values

`mhlo.rsqrt` (::mlir::mhlo::RsqrtOp)

Rsqrt operation

Syntax:

operation ::= `mhlo.rsqrt` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise reciprocal square root operation on operand tensor and produces a result tensor, implementing the rSqrt operation from the IEEE-754 specification.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#rsqrt

Example:

%result = mhlo.rsqrt %operand : tensor<2x2xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.scatter` (::mlir::mhlo::ScatterOp)

Scatter operation

Produces results tensors which are equal to inputs tensors except that several slices specified by scatter_indices are updated with the values updates using update_computation.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#scatter

Example:

%result = "mhlo.scatter"(%input, %scatter_indices, %update) ({
  ^bb0(%arg0: tensor<i32>, %arg1: tensor<i32>):
    %0 = mhlo.add %arg0, %arg1 : tensor<i32>
    mhlo.return %0 : tensor<i32>
}) {
  scatter_dimension_numbers = #mhlo.scatter<
    update_window_dims = [2,3],
    inserted_window_dims = [0],
    scatter_dims_to_operand_dims = [1, 0],
    index_vector_dim = 2>,
  indices_are_sorted = false,
  unique_indices = false
} : (tensor<3x4x2xi32>, tensor<2x3x2xi64>, tensor<2x3x2x2xi32>) -> tensor<3x4x2xi32>

Traits: RecursiveMemoryEffects, SameVariadicOperandSize

Interfaces: InferTypeOpInterface

Attributes:

Attribute	MLIR Type	Description
`scatter_dimension_numbers`	::mlir::mhlo::ScatterDimensionNumbersAttr	Attribute that models the dimension information for scatter
`indices_are_sorted`	::mlir::BoolAttr	bool attribute
`unique_indices`	::mlir::BoolAttr	bool attribute

Operands:

Operand	Description
`inputs`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values
`scatter_indices`	tensor of integer or index values
`updates`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

Results:

Result

Description

«unnamed»

`mhlo.select_and_scatter` (::mlir::mhlo::SelectAndScatterOp)

SelectAndScatter operation

Scatters the values from the source tensor using scatter based on the outcome of reduce_window of the input tensor using select and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#select_and_scatter

Example:

%result = "mhlo.select_and_scatter"(%operand, %source, %init_value) ({
  ^bb0(%arg0: tensor<i32>, %arg1: tensor<i32>):
    %0 = "mhlo.compare"(%arg0, %arg1) {
      comparison_direction = #stablehlo<comparison_direction GE>
    } : (tensor<i32>, tensor<i32>) -> tensor<i1>
    "mhlo.return"(%0) : (tensor<i1>) -> ()
}, {
  ^bb0(%arg0: tensor<i32>, %arg1: tensor<i32>):
    %0 = "mhlo.add"(%arg0, %arg1) : (tensor<i32>, tensor<i32>) -> tensor<i32>
    "mhlo.return"(%0) : (tensor<i32>) -> ()
}) {
  window_dimensions = dense<[3, 1]> : tensor<2xi64>,
  window_strides = dense<[2, 1]> : tensor<2xi64>,
  padding = dense<[[0, 1], [0, 0]]> : tensor<2x2xi64>
} : (tensor<4x2xi32>, tensor<2x2xi32>, tensor<i32>) -> tensor<4x2xi32>

Traits: RecursiveMemoryEffects

Interfaces: InferTypeOpInterface

Attributes:

Attribute	MLIR Type	Description
`window_dimensions`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`window_strides`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`padding`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values
`source`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values
`init_value`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

Results:

Result

Description

«unnamed»

`mhlo.select` (::mlir::mhlo::SelectOp)

Select operation

Syntax:

operation ::= `mhlo.select` operands attr-dict `:`
              custom<SelectOpType>(type($pred), type($on_true), type($on_false), type($result))

Produces a result tensor where each element is selected from on_true or on_false tensor based on the value of the corresponding element of pred.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#select

Example:

%result = mhlo.select %pred, %on_true, %on_false : tensor<2x2xi1>, tensor<2x2xi32>

Traits: AlwaysSpeculatableImplTrait, HLO_BroadcastingElementwise, InferTensorType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`pred`	tensor of pred (AKA boolean or 1-bit integer) values
`on_true`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values
`on_false`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

Results:

Result Description

`mhlo.send` (::mlir::mhlo::SendOp)

Send operation

Sends inputs to a channel channel_id and produces a result token.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#send

Example:

%result = "mhlo.send"(%operand, %token) {
  // channel_id = 5 : i64,
  // channel_type = #stablehlo<channel_type DEVICE_TO_HOST>,
  channel_handle = #mhlo.channel_handle<handle = 5, type = 2>,
  is_host_transfer = true
} : (tensor<3x4xi32>, !mhlo.token) -> !mhlo.token

Interfaces: InferTypeOpInterface

Attributes:

Attribute	MLIR Type	Description
`channel_handle`	::mlir::mhlo::ChannelHandleAttr	two 64-bit integers 'handle' and 'type'
`is_host_transfer`	::mlir::BoolAttr	bool attribute

Operands:

Operand Description

token token

Results:

Result	Description
«unnamed»	token

`mhlo.set_dimension_size` (::mlir::mhlo::SetDimensionSizeOp)

SetDimensionSize operation

This operation is a work in progress, so it is not yet included in the specification: https://github.com/openxla/stablehlo/issues/8

Informally, this operation does the same thing as XLA's SetDimensionSize: https://www.tensorflow.org/xla/operation_semantics#setdimensionsize

Example:

%0 = mhlo.set_dimension_size %arg0, %arg1, dim = 1 : (tensor<4x2xf32>, tensor<i32>) -> tensor<4x2xf32>

Traits: AlwaysSpeculatableImplTrait, InferTensorType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`dimension`	::mlir::IntegerAttr	64-bit signless integer attribute

Operands:

Operand Description

size tensor of 32-bit signless integer values

Results:

Result

Description

«unnamed»

`mhlo.shift_left` (::mlir::mhlo::ShiftLeftOp)

ShiftLeft operation

Syntax:

operation ::= `mhlo.shift_left` $lhs `,` $rhs attr-dict
              `:` custom<SameOperandsAndResultType>(type($lhs), type($rhs), type($result))

Performs element-wise left-shift operation on the lhs tensor by rhs number of bits and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#shift_left

Example:

%result = mhlo.shift_left %lhs, %rhs : tensor<6xi8>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`lhs`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values
`rhs`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result	Description
`result`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

`mhlo.shift_right_arithmetic` (::mlir::mhlo::ShiftRightArithmeticOp)

ShiftRightArithmetic operation

Syntax:

operation ::= `mhlo.shift_right_arithmetic` $lhs `,` $rhs attr-dict
              `:` custom<SameOperandsAndResultType>(type($lhs), type($rhs), type($result))

Performs element-wise arithmetic right-shift operation on the lhs tensor by rhs number of bits and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#shift_right_arithmetic

Example:

%result = mhlo.shift_right_arithmetic %lhs, %rhs : tensor<6xi8>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`lhs`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values
`rhs`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result	Description
`result`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

`mhlo.shift_right_logical` (::mlir::mhlo::ShiftRightLogicalOp)

ShiftRightLogical operation

Syntax:

operation ::= `mhlo.shift_right_logical` $lhs `,` $rhs attr-dict
              `:` custom<SameOperandsAndResultType>(type($lhs), type($rhs), type($result))

Performs element-wise logical right-shift operation on the lhs tensor by rhs number of bits and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#shift_right_logical

Example:

%result = mhlo.shift_right_logical %lhs, %rhs : tensor<6xi8>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`lhs`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values
`rhs`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result	Description
`result`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

`mhlo.sign` (::mlir::mhlo::SignOp)

Sign operation

Syntax:

operation ::= `mhlo.sign` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Returns the sign of the operand element-wise and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#sign

Example:

%result = mhlo.sign %operand : tensor<7xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of 4/8/16/32/64-bit signless integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of 4/8/16/32/64-bit signless integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.sine` (::mlir::mhlo::SineOp)

Sine operation

Syntax:

operation ::= `mhlo.sine` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise sine operation on operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#sine

Example:

%result = mhlo.sine %operand : tensor<2xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.slice` (::mlir::mhlo::SliceOp)

Slice operation

Extracts a slice from the operand using statically-computed starting indices and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#slice

Example:

%result = "mhlo.slice" (%operand) {
  start_indices = dense<[1, 2]> : tensor<2xi64>,
  limit_indices = dense<[3, 4]> : tensor<2xi64>,
  strides = dense<1> : tensor<2xi64>
} : (tensor<3x4xi64>) -> tensor<2x2xi64>

Traits: AlwaysSpeculatableImplTrait, SameOperandsAndResultElementType

Interfaces: ConditionallySpeculatable, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`start_indices`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`limit_indices`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute
`strides`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.sort` (::mlir::mhlo::SortOp)

Sort operation

Sorts a variadic number of tensors in inputs together, according to a custom comparator, along the given dimension and produces a variadic number of tensors as results.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#sort

Example:

%result0, %result1 = "mhlo.sort"(%input0, %input1) ({
  ^bb0(%arg0: tensor<i32>, %arg1: tensor<i32>, %arg2: tensor<i32>, %arg3: tensor<i32>):
    %predicate = "mhlo.compare"(%arg0, %arg1) {
      comparison_direction = #stablehlo<comparison_direction GT>
      } : (tensor<i32>, tensor<i32>) -> tensor<i1>
    "mhlo.return"(%predicate) : (tensor<i1>) -> ()
}) {
  dimension = 0 : i64,
  is_stable = true
} : (tensor<2x3xi32>, tensor<2x3xi32>) -> (tensor<2x3xi32>, tensor<2x3xi32>)

Traits: InferTensorType, RecursiveMemoryEffects, SameOperandsAndResultShape

Interfaces: InferShapedTypeOpInterface, InferTypeOpInterface

Attributes:

Attribute	MLIR Type	Description
`dimension`	::mlir::IntegerAttr	64-bit signless integer attribute
`is_stable`	::mlir::BoolAttr	bool attribute

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.sqrt` (::mlir::mhlo::SqrtOp)

Sqrt operation

Syntax:

operation ::= `mhlo.sqrt` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise square root operation on operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#sqrt

Example:

%result = mhlo.sqrt %operand : tensor<2x2xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.stochastic_convert` (::mlir::mhlo::StochasticConvertOp)

StochasticConvert operation

This operation is a work in progress, so it is not yet included in the specification: https://github.com/openxla/stablehlo/issues/295

Informally, this operation performs element-wise conversion of values from a bigger type to a smaller one with stochastic rounding using the random number passed in.

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type values
`random`	tensor of 4/8/16/32/64-bit unsigned integer values

Results:

Result Description

`mhlo.subtract` (::mlir::mhlo::SubtractOp)

Subtract operation

Syntax:

operation ::= `mhlo.subtract` $lhs `,` $rhs attr-dict
              `:` custom<SameOperandsAndResultType>(type($lhs), type($rhs), type($result))

Performs element-wise subtraction of two tensors lhs and rhs and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#subtract

Example:

%result = mhlo.subtract %lhs, %rhs : tensor<2xi32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`lhs`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values
`rhs`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.tan` (::mlir::mhlo::TanOp)

Tan operation

Syntax:

operation ::= `mhlo.tan` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

This operation is a work in progress, so it is not yet included in the specification: https://github.com/openxla/stablehlo/issues/954

Informally, this operation returns Tan(operand) element-wise.

Example:

%0 = mhlo.tan %arg0 : tensor<2xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.tanh` (::mlir::mhlo::TanhOp)

Tanh operation

Syntax:

operation ::= `mhlo.tanh` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

Performs element-wise hyperbolic tangent operation on operand tensor and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#tanh

Example:

%result = mhlo.tanh %operand : tensor<2xf32>

Traits: AlwaysSpeculatableImplTrait, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
`result`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.topk` (::mlir::mhlo::TopKOp)

TopK operation

Syntax:

operation ::= `mhlo.topk` `(`$operand `,` `k` `=` $k`)` $body attr-dict `:`
              type($operand) `->` `(`type($values)`,` type($indices)`)`

Returns top k values and their indices, along the last dimension of the operand using the given comparator (for usual topk behavior, it should be strict-greater-than operation).

See: https://www.tensorflow.org/xla/operation_semantics#top-k

Example:

%values, %indices = mhlo.topk(%operand, k=5) {
  ^bb0(%arg0: tensor<f32>, %arg1: tensor<f32>):
    %predicate = mhlo.compare GT, %arg0, %arg1 : (tensor<f32>, tensor<f32>) -> tensor<i1>
    mhlo.return %predicate : tensor<i1>
} : tensor<100xf32> -> (tensor<5xf32>, tensor<5xi32>)

Traits: InferTensorType, RecursiveMemoryEffects

Interfaces: InferShapedTypeOpInterface, InferTypeOpInterface

Attributes:

Attribute	MLIR Type	Description
`k`	::mlir::IntegerAttr	64-bit signless integer attribute

Operands:

Operand Description

Results:

Result Description

values tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

indices tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

`mhlo.torch_index_select` (::mlir::mhlo::TorchIndexSelectOp)

TorchIndexSelect operation

This operation is on its way out of StableHLO, so it is not included in the specification: https://github.com/openxla/stablehlo/issues/3

Informally, this operation does the same thing as PyTorch's index_select, augmented with support for batch dimensions: https://pytorch.org/docs/stable/generated/torch.index_select.html

The batch_dims attribute specifies the number of major batch dimensions (0 or more) that act like a multidimensional loop over both the operand and the index.

Example:

%result = "mhlo.torch_index_select"(%operand, %index) {
  dim = 2 : i64,
  batch_dims = 1 : i64
} : (tensor<8x128x3072x64xf32>, tensor<8x16x1024xi32>) -> tensor<8x128x16x1024x64xf32>

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`dim`	::mlir::IntegerAttr	64-bit signless integer attribute
`batch_dims`	::mlir::IntegerAttr	64-bit signless integer attribute

Operands:

Operand Description

index tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

Results:

Result

Description

«unnamed»

`mhlo.trace` (::mlir::mhlo::TraceOp)

Trace operation

Syntax:

operation ::= `mhlo.trace` $operand `,` $tag attr-dict `:` type($operand)

This operation is on its way out of StableHLO, so it is not included in the specification: https://github.com/openxla/stablehlo/issues/604

It is not used by JAX, PyTorch or TensorFlow, so it looks like we should've classified it as "Private to XLA" and not included it in StableHLO in the first place. With that in mind, its semantics will not be documented here.

Example:

mhlo.trace %arg0, "In test code." : tensor<5x1x5xi32>

Attributes:

Attribute	MLIR Type	Description
`tag`	::mlir::StringAttr	string attribute

Operands:

Operand Description

`mhlo.transpose` (::mlir::mhlo::TransposeOp)

Transpose operation

Permutes the dimensions of operand tensor using permutation and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#transpose

Example:

%0 = mhlo.transpose %arg0, dims = [2, 1, 0] : (tensor<1x2x3xi32>) -> tensor<3x2x1xi32>

Traits: AlwaysSpeculatableImplTrait, SameOperandsAndResultElementType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`permutation`	::mlir::DenseIntElementsAttr	64-bit signless integer elements attribute

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.triangular_solve` (::mlir::mhlo::TriangularSolveOp)

TriangularSolve operation

Solves batches of systems of linear equations with lower or upper triangular coefficient matrices.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#triangular_solve

Example:

%result = "mhlo.triangular_solve"(%a, %b) {
  left_side = true,
  lower = true,
  unit_diagonal = false,
  transpose_a = #stablehlo<transpose NO_TRANSPOSE>
} : (tensor<3x3xf32>, tensor<3x3xf32>) -> tensor<3x3xf32>

Traits: AlwaysSpeculatableImplTrait, InferTensorType, SameOperandsAndResultElementType

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`left_side`	::mlir::BoolAttr	bool attribute
`lower`	::mlir::BoolAttr	bool attribute
`unit_diagonal`	::mlir::BoolAttr	bool attribute
`transpose_a`	::mlir::mhlo::TransposeAttr	Transpose options

Operands:

Operand	Description
`a`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values
`b`	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

Results:

Result	Description
«unnamed»	tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or complex type with 32-bit float or 64-bit float elements values

`mhlo.tuple` (::mlir::mhlo::TupleOp)

Tuple operation

Syntax:

operation ::= `mhlo.tuple` $val attr-dict `:` custom<TupleOpType>(type($val), type($result))

Produces a result tuple from values val.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#tuple

Example:

%result = mhlo.tuple %val0, %val1 : tuple<tensor<2xf32>, tuple<tensor<i32>>>

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand Description

val tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token or nested tuple with any combination of tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token values

Results:

Result Description

result nested tuple with any combination of tensor of f8E4M3B11FNUZ type or f8E4M3FN type or f8E4M3FNUZ type or f8E5M2 type or f8E5M2FNUZ type or 16-bit float or 32-bit float or 64-bit float or bfloat16 type or pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer or complex type with 32-bit float or 64-bit float elements or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values or token values

`mhlo.unary_einsum` (::mlir::mhlo::UnaryEinsumOp)

UnaryEinsum operation

This operation is on its way out of StableHLO, so it is not included in the specification: https://github.com/openxla/stablehlo/issues/3

Informally, this operation does the same thing as TF's einsum: https://www.tensorflow.org/api_docs/python/tf/einsum

Example:

%result = "mhlo.unary_einsum"(%operand) {
  einsum_config = "ab->a"
} : (tensor<4x16xf32>) -> tensor<4xf32>

Traits: AlwaysSpeculatableImplTrait

Interfaces: ConditionallySpeculatable, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Attributes:

Attribute	MLIR Type	Description
`einsum_config`	::mlir::StringAttr	string attribute

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.uniform_dequantize` (::mlir::mhlo::UniformDequantizeOp)

UniformDequantize operation

Syntax:

operation ::= `mhlo.uniform_dequantize` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

This operation is a work in progress, so it is not yet included in the specification: https://github.com/openxla/stablehlo/issues/588

Informally, this operation converts uniform quantized tensors to floating point tensors according to the quantization parameters defined by the operand type.

Example:

%result = mhlo.uniform_dequantize %operand : (tensor<16x16x!quant.uniform<i8:f32, 34.0:16>>) -> tensor<16x16xf32>

Traits: AlwaysSpeculatableImplTrait, Elementwise, InferTensorType, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

Results:

Result	Description
`result`	tensor of 32-bit float or bfloat16 type values

`mhlo.uniform_quantize` (::mlir::mhlo::UniformQuantizeOp)

UniformQuantize operation

Syntax:

operation ::= `mhlo.uniform_quantize` $operand attr-dict
              `:` custom<SameOperandsAndResultType>(type($operand), type($result))

This operation is a work in progress, so it is not yet included in the specification: https://github.com/openxla/stablehlo/issues/588

Informally, this operation converts floating point tensors or uniform quantized tensors to uniform quantized tensors according to the quantization parameters defined by the result type.

Example:

%result = mhlo.uniform_quantize %operand : (tensor<16x16xf32>) -> tensor<16x16x!quant.uniform<ui8:f32, 34.0:16>>

Traits: AlwaysSpeculatableImplTrait, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`operand`	tensor of 32-bit float or bfloat16 type or 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

Results:

Result	Description
`result`	tensor of 4/8/16/32-bit uniform quantized signed integer or 4/8/16/32-bit uniform quantized unsigned integer values

`mhlo.while` (::mlir::mhlo::WhileOp)

While operation

Produces the output from executing body function 0 or more times while the cond function outputs true.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#while

Example:

%results0, %results1 = "mhlo.while"(%operand0, %operand1) ({
  ^bb0(%arg0: tensor<i32>, %arg1: tensor<i32>):
    %0 = "mhlo.compare"(%arg0, %arg1) {
      comparison_direction = #stablehlo<comparison_direction LT>
    } : (tensor<i32>, tensor<i32>) -> tensor<i1>
    "mhlo.return"(%0) : (tensor<i1>) -> ()
}, {
  ^bb0(%arg0: tensor<i32>, %arg1: tensor<i32>):
    %0 = "mhlo.add"(%arg0, %constant0) : (tensor<i32>, tensor<i32>) -> tensor<i32>
    "mhlo.return"(%0, %arg1) : (tensor<i32>, tensor<i32>) -> ()
}) : (tensor<i32>, tensor<i32>) -> (tensor<i32>, tensor<i32>)

Traits: RecursiveMemoryEffects, SingleBlockImplicitTerminator

Interfaces: InferTypeOpInterface, OpAsmOpInterface

Operands:

Operand Description

Results:

Result

Description

«unnamed»

`mhlo.xla.rng_get_and_update_state` (::mlir::mhlo::XlaRngGetAndUpdateStateOp)

XlaRngGetAndUpdateState operation

Syntax:

operation ::= `mhlo.xla.rng_get_and_update_state` attr-dict

This operation is private to the XLA compiler, so it is does not yet have a specification.

Informally, this operation represents the change of the global random number generator state for rng instructions. The global state is incremented by delta and the old state is returned.

The output is currently defined for a single output type. If this changes in the future to support multiple types, lowering to use of a global memref must ensure that a single memref is still used and updated appropriately.

Interfaces: InferTypeOpInterface

Attributes:

Attribute	MLIR Type	Description
`delta`	::mlir::IntegerAttr	64-bit signless integer attribute

Results:

Result	Description
«unnamed»	statically shaped tensor of 64-bit unsigned integer values

`mhlo.xor` (::mlir::mhlo::XorOp)

Xor operation

Syntax:

operation ::= `mhlo.xor` $lhs `,` $rhs attr-dict
              `:` custom<SameOperandsAndResultType>(type($lhs), type($rhs), type($result))

Performs element-wise XOR of two tensors lhs and rhs and produces a result tensor.

See: https://github.com/openxla/stablehlo/blob/main/docs/spec.md#xor

Example:

%result = mhlo.xor %lhs, %rhs : tensor<2xi32>

Traits: AlwaysSpeculatableImplTrait, Commutative, CompatibleOperandsAndResultType, Elementwise, SameOperandsAndResultShape

Interfaces: ConditionallySpeculatable, InferShapedTypeOpInterface, InferTypeOpInterface, NoMemoryEffect (MemoryEffectOpInterface)

Effects: MemoryEffects::Effect{}

Operands:

Operand	Description
`lhs`	tensor of pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values
`rhs`	tensor of pred (AKA boolean or 1-bit integer) or 4/8/16/32/64-bit signless integer or 4/8/16/32/64-bit unsigned integer values

Results:

Result Description

Attribute definition

ArgResultAliasAttr

Attribute that models the alias relationship of entry function argument

This attribute captures the alias relationship of an MHLO main function argument to one of the results, denoted by resultIndex. The argTupleIndices and resultTupleIndices are used to index into nested tuples in operand and result respectively. If isMustAlias is true then the operand-result pair must alias.

This is meant to be used as an attribute on a function argument in MHLO. For example, in the following code it expresses that %arg1 may alias 0-th result.

func @main(%arg0: tensor<2xf32>, %arg1: tensor<3xf32> {mhlo.result_alias =
    mhlo.result_alias<result_index = [2], ...>}
  ) -> tensor<2xf32>, tensor<3xf32> {
  // function body ...
}

Parameters:

Parameter	C++ type	Description
argTupleIndices	`::llvm::ArrayRef<int64_t>`	Dimension
resultIndex	`int64_t`
resultTupleIndices	`::llvm::ArrayRef<int64_t>`	Dimension
isMustAlias	`bool`

ChannelHandleAttr

two 64-bit integers 'handle' and 'type'

Syntax:

#mhlo.channel_handle<
  int64_t,   # handle
  int64_t   # type
>

Parameters:

Parameter	C++ type	Description
handle	`int64_t`
type	`int64_t`

ComparisonDirectionAttr

Which comparison operation to perform.

Syntax:

#mhlo.comparison_direction<
  ::mlir::mhlo::ComparisonDirection   # value
>

Parameters:

Parameter	C++ type	Description
value	`::mlir::mhlo::ComparisonDirection`	an enum of type ComparisonDirection

ComparisonTypeAttr

Which comparison type to use.

Syntax:

#mhlo.comparison_type<
  ::mlir::mhlo::ComparisonType   # value
>

Parameters:

Parameter	C++ type	Description
value	`::mlir::mhlo::ComparisonType`	an enum of type ComparisonType

ConvDimensionNumbersAttr

Structure of dimension information for conv op

Parameters:

Parameter	C++ type	Description
inputBatchDimension	`int64_t`
inputFeatureDimension	`int64_t`
inputSpatialDimensions	`::llvm::ArrayRef<int64_t>`	Dimension
kernelInputFeatureDimension	`int64_t`
kernelOutputFeatureDimension	`int64_t`
kernelSpatialDimensions	`::llvm::ArrayRef<int64_t>`	Dimension
outputBatchDimension	`int64_t`
outputFeatureDimension	`int64_t`
outputSpatialDimensions	`::llvm::ArrayRef<int64_t>`	Dimension

CrossProgramPrefetchAttr

Argument that is prefetched from another program

Syntax:

#mhlo.cross_program_prefetch<
  int64_t,   # parameter
  ::llvm::ArrayRef<int64_t>,   # indices
  std::optional<int64_t>   # offset
>

This attribute captures an argument that is prefetched from another program. For a given CrossProgramPrefetchAttr, parameter tells us which argument of the main function of the module is prefetched, and indices is a shape index telling us what subshape of that argument is prefetched.

A shape has a subshape iff it is a tuple. In that case, the subshape of the tuple by indices is the shape achieved after indexing by each element of indices in turn. For example, the [1,0] subshape of tuple<tuple<token, token>, tuple<tensor<i32>, token>> is tensor<i32>.

An empty value for indices means the whole shape is prefetched.

For example,

module attributes { mhlo.cross_program_prefetch = [ #mhlo.cross_program_prefetch< parameter = 0, indices = [0]> ]} {
  func.func @copy(%arg0 : tuple<tensor<2x3xi32>, tensor<i32>>) -> tuple<tensor<2x3xi32>, tensor<i32>> {
    %0 = "mhlo.copy"(%arg0) {is_cross_program_prefetch}
    return %0 : tuple<tensor<2x3xi32>, tensor<i32>>
  }
  func.func @main(%arg0 : tuple<tensor<2x3xi32>, tensor<i32>>) -> tuple<tensor<2x3xi32>, tensor<i32>> {
    %1 = "mhlo.async_start"(%arg0) {called_computation=@copy}
    %2 = "mhlo.async_done"(%1) {called_computation=@copy}
    return %2 : tuple<tensor<2x3xi32>, tensor<i32>>
  }
}

The parameter = 0 tells us that the async copy of the 0th parameter is a cross_program_prefetch, while the index of [0] tells us that the 0th element of the tuple is prefetched while the other element of the tuple is not.

Parameters:

Parameter	C++ type	Description
parameter	`int64_t`
indices	`::llvm::ArrayRef<int64_t>`	Dimension
offset	`std::optional<int64_t>`

CustomCallScheduleAttr

Specifies the desired schedule for the custom-call.

Syntax:

#mhlo.custom_call_schedule<
  ::mlir::mhlo::CustomCallSchedule   # value
>

Parameters:

Parameter	C++ type	Description
value	`::mlir::mhlo::CustomCallSchedule`	an enum of type CustomCallSchedule

DequantizeModeAttr

Dequantization mode. Only MIN_COMBINED is supported.

Syntax:

#mhlo.dequantize_mode<
  ::mlir::mhlo::DequantizeMode   # value
>

Parameters:

Parameter	C++ type	Description
value	`::mlir::mhlo::DequantizeMode`	an enum of type DequantizeMode

DomainKindAttr

Kind of domain metatdata attached to an HLO domain.

Syntax:

#mhlo.kind<
  ::mlir::mhlo::DomainKind   # value
>

Parameters:

Parameter	C++ type	Description
value	`::mlir::mhlo::DomainKind`	an enum of type DomainKind

DotDimensionNumbersAttr

Attribute that models the dimension information for dot.

Parameters:

Parameter	C++ type	Description
lhsBatchingDimensions	`::llvm::ArrayRef<int64_t>`	Dimension
rhsBatchingDimensions	`::llvm::ArrayRef<int64_t>`	Dimension
lhsContractingDimensions	`::llvm::ArrayRef<int64_t>`	Dimension
rhsContractingDimensions	`::llvm::ArrayRef<int64_t>`	Dimension

DynamicParameterBindingAttr

Indicates which parameters represent dynamic dimension sizes.

Syntax:

#mhlo.dynamic_parameter_binding<
  int64_t,   # dynamic_param_num
  ::llvm::ArrayRef<int64_t>,   # dynamic_param_indices
  int64_t,   # target_param_num
  ::llvm::ArrayRef<int64_t>,   # target_param_indices
  int64_t   # target_param_dim_num
>

This attribute indicates which parameters to the main function of a given module have the runtime values for dynamic dimension sizes for other parameters.

Each binding here specifies that parameter containing the runtime value of the dynamic dimension size dynamic_param_num (which contains the runtime size at a subshape given by the shape index dynamic_param_index) and the dimension for which that is the size, which is the target_param_dim_num dimension of the target_param_num parameter to main at subshape target_param_index.

See cross_program_prefetch for a discussion of subshapes.

For example,

module @main attributes { mhlo.dynamic_parameter_bindings = [ #mhlo.dynamic_parameter_binding< dynamic_param_num = 0, dynamic_param_indices = [], target_param_num = 1, target_param_indices = [], target_param_dim_num = 0>] } { func.func @main(%a : tensor, %b : tensor<?xf32, #mhlo.type_extensions>) -> () { func.return } }

Here, 'b' (param index 1) has a dynamic shape whose real size is determined at runtime. 'a' represents the real size of b's zeroth dimension.

Parameters:

Parameter	C++ type	Description
dynamic_param_num	`int64_t`
dynamic_param_indices	`::llvm::ArrayRef<int64_t>`	Dimension
target_param_num	`int64_t`
target_param_indices	`::llvm::ArrayRef<int64_t>`	Dimension
target_param_dim_num	`int64_t`

FftTypeAttr

XLA fast fourier transform type.

Syntax:

#mhlo.fft_type<
  ::mlir::mhlo::FftType   # value
>

Parameters:

Parameter	C++ type	Description
value	`::mlir::mhlo::FftType`	an enum of type FftType

FusionKindAttr

fusion kind

Syntax:

#mhlo.fusion_kind<
  ::mlir::mhlo::FusionKind   # value
>

Parameters:

Parameter	C++ type	Description
value	`::mlir::mhlo::FusionKind`	an enum of type FusionKind

GatherDimensionNumbersAttr

Attribute that models the dimension information for gather

Parameters:

Parameter	C++ type	Description
offsetDims	`::llvm::ArrayRef<int64_t>`	Dimension
collapsedSliceDims	`::llvm::ArrayRef<int64_t>`	Dimension
startIndexMap	`::llvm::ArrayRef<int64_t>`	Dimension
indexVectorDim	`int64_t`

OutputOperandAliasAttr

Attribute that models the alias relationship of output and operand of a CustomCall op

Syntax:

#mhlo.output_operand_alias<
  ::llvm::ArrayRef<int64_t>,   # outputTupleIndices
  int64_t,   # operandIndex
  ::llvm::ArrayRef<int64_t>   # operandTupleIndices
>

This attribute captures the alias relationship of the output to one of the operands for a CustomCall op, denoted by operand_index. The output_tuple_indices and operand_tuple_indices are used to index into output and operand types. These indices lists are empty if the corresponding types are not tuple types, and can be arbitrarily long in case of arbitrarily nested tuple types.

See https://www.tensorflow.org/xla/aliasing

Example when used as array with in mhlo.custom-call:

%0 = "mhlo.custom_call"(%arg0, %arg1) {
  // other attributes
  output_operand_alias = [
    #mhlo.output_operand_alias<output_tuple_indices = [0],
                               operand_index = 0,
                               operand_tuple_indices = [1]>
  ]
} : (tuple<tensor<1x1xf32>, tensor<2x3xf32>>, tensor<5x5xf32>) -> tuple<tensor<2x3xf32>>

The output and the 0th operand are both tuples. The aliasing shows the
relationship between the 0th element in output tuple with the 1st element in
the 0th operand. And both of them are of the same type: tensor<2x3xf32>.

Parameters:

Parameter	C++ type	Description
outputTupleIndices	`::llvm::ArrayRef<int64_t>`	Dimension
operandIndex	`int64_t`
operandTupleIndices	`::llvm::ArrayRef<int64_t>`	Dimension

PrecisionAttr

XLA precision for an operand. Has backend specific meaning.

Syntax:

#mhlo.precision<
  ::mlir::mhlo::Precision   # value
>

Parameters:

Parameter	C++ type	Description
value	`::mlir::mhlo::Precision`	an enum of type Precision

RngAlgorithmAttr

XLA PRNG algorithm to be used.

Syntax:

#mhlo.rng_algorithm<
  ::mlir::mhlo::RngAlgorithm   # value
>

Parameters:

Parameter	C++ type	Description
value	`::mlir::mhlo::RngAlgorithm`	an enum of type RngAlgorithm

RngDistributionAttr

XLA PRNG distribution to be used.

Syntax:

#mhlo.rng_distribution<
  ::mlir::mhlo::RngDistribution   # value
>

Parameters:

Parameter	C++ type	Description
value	`::mlir::mhlo::RngDistribution`	an enum of type RngDistribution

ScatterDimensionNumbersAttr

Attribute that models the dimension information for scatter

Parameters:

Parameter	C++ type	Description
updateWindowDims	`::llvm::ArrayRef<int64_t>`	Dimension
insertedWindowDims	`::llvm::ArrayRef<int64_t>`	Dimension
scatterDimsToOperandDims	`::llvm::ArrayRef<int64_t>`	Dimension
indexVectorDim	`int64_t`

TransposeAttr

Transpose options

Syntax:

#mhlo.transpose<
  ::mlir::mhlo::Transpose   # value
>

Parameters:

Parameter	C++ type	Description
value	`::mlir::mhlo::Transpose`	an enum of type Transpose

TypeExtensionsAttr

Attribute that extends tensor type with MHLO type properties.

Syntax:

#mhlo.type_extensions<
  ::llvm::ArrayRef<int64_t>   # bounds
>

This attribute is used to extend MLIR tensor type with MHLO tensor specific properties. These properties aren't modeled in the MLIR type. This attribute is set in the encoding field of the tensor type.

See HLO_BoundedAttrInterface for documentation for bounds.

Parameters:

Parameter	C++ type	Description
bounds	`::llvm::ArrayRef<int64_t>`

Type definition

AsyncBundleType

Opaque collection of other types

Syntax:

!mhlo.async_bundle<
  ::llvm::ArrayRef<Type>   # types
>

Parameters:

Parameter	C++ type	Description
types	`::llvm::ArrayRef<Type>`

'mhlo' Dialect

Operation definition

mhlo.abs (::mlir::mhlo::AbsOp)

Operands:

Results:

mhlo.add_dependency (::mlir::mhlo::AddDependencyOp)

Operands:

Results:

mhlo.add (::mlir::mhlo::AddOp)

Operands:

Results:

mhlo.after_all (::mlir::mhlo::AfterAllOp)

Operands:

Results:

mhlo.all_gather (::mlir::mhlo::AllGatherOp)

Attributes:

Operands:

Results:

mhlo.all_reduce (::mlir::mhlo::AllReduceOp)

Attributes:

Operands:

Results:

mhlo.all_to_all (::mlir::mhlo::AllToAllOp)

Attributes:

Operands:

Results:

mhlo.and (::mlir::mhlo::AndOp)

Operands:

Results:

mhlo.async_done (::mlir::mhlo::AsyncDoneOp)

Attributes:

Operands:

Results:

mhlo.async_start (::mlir::mhlo::AsyncStartOp)

Attributes:

Operands:

Results:

mhlo.async_update (::mlir::mhlo::AsyncUpdateOp)

Attributes:

Operands:

Results:

mhlo.atan2 (::mlir::mhlo::Atan2Op)

Operands:

Results:

mhlo.batch_norm_grad (::mlir::mhlo::BatchNormGradOp)

Attributes:

Operands:

Results:

mhlo.batch_norm_inference (::mlir::mhlo::BatchNormInferenceOp)

Attributes:

Operands:

Results:

mhlo.batch_norm_training (::mlir::mhlo::BatchNormTrainingOp)

Attributes:

Operands:

Results:

mhlo.bitcast_convert (::mlir::mhlo::BitcastConvertOp)

Operands:

Results:

mhlo.bitcast (::mlir::mhlo::BitcastOp)

Operands:

Results:

mhlo.broadcast_in_dim (::mlir::mhlo::BroadcastInDimOp)

Attributes:

Operands:

Results:

mhlo.broadcast (::mlir::mhlo::BroadcastOp)

Attributes:

Operands:

Results:

mhlo.case (::mlir::mhlo::CaseOp)

Operands:

Results:

mhlo.cbrt (::mlir::mhlo::CbrtOp)

Operands:

Results:

mhlo.ceil (::mlir::mhlo::CeilOp)

Operands:

Results:

mhlo.cholesky (::mlir::mhlo::CholeskyOp)

`mhlo.abs` (::mlir::mhlo::AbsOp)

`mhlo.add_dependency` (::mlir::mhlo::AddDependencyOp)

`mhlo.add` (::mlir::mhlo::AddOp)

`mhlo.after_all` (::mlir::mhlo::AfterAllOp)

`mhlo.all_gather` (::mlir::mhlo::AllGatherOp)

`mhlo.all_reduce` (::mlir::mhlo::AllReduceOp)

`mhlo.all_to_all` (::mlir::mhlo::AllToAllOp)

`mhlo.and` (::mlir::mhlo::AndOp)

`mhlo.async_done` (::mlir::mhlo::AsyncDoneOp)

`mhlo.async_start` (::mlir::mhlo::AsyncStartOp)

`mhlo.async_update` (::mlir::mhlo::AsyncUpdateOp)

`mhlo.atan2` (::mlir::mhlo::Atan2Op)

`mhlo.batch_norm_grad` (::mlir::mhlo::BatchNormGradOp)

`mhlo.batch_norm_inference` (::mlir::mhlo::BatchNormInferenceOp)

`mhlo.batch_norm_training` (::mlir::mhlo::BatchNormTrainingOp)

`mhlo.bitcast_convert` (::mlir::mhlo::BitcastConvertOp)

`mhlo.bitcast` (::mlir::mhlo::BitcastOp)

`mhlo.broadcast_in_dim` (::mlir::mhlo::BroadcastInDimOp)

`mhlo.broadcast` (::mlir::mhlo::BroadcastOp)

`mhlo.case` (::mlir::mhlo::CaseOp)

`mhlo.cbrt` (::mlir::mhlo::CbrtOp)

`mhlo.ceil` (::mlir::mhlo::CeilOp)

`mhlo.cholesky` (::mlir::mhlo::CholeskyOp)

`mhlo.clamp` (::mlir::mhlo::ClampOp)

`mhlo.count_leading_zeros` (::mlir::mhlo::ClzOp)

`mhlo.collective_permute` (::mlir::mhlo::CollectivePermuteOp)

`mhlo.compare` (::mlir::mhlo::CompareOp)

`mhlo.complex` (::mlir::mhlo::ComplexOp)

`mhlo.compute_reshape_shape` (::mlir::mhlo::ComputeReshapeShapeOp)

`mhlo.concatenate` (::mlir::mhlo::ConcatenateOp)

`mhlo.constant` (::mlir::mhlo::ConstantOp)

`mhlo.convert` (::mlir::mhlo::ConvertOp)

`mhlo.convolution` (::mlir::mhlo::ConvolutionOp)

`mhlo.copy` (::mlir::mhlo::CopyOp)

`mhlo.cosine` (::mlir::mhlo::CosineOp)

`mhlo.create_token` (::mlir::mhlo::CreateTokenOp)

`mhlo.cross-replica-sum` (::mlir::mhlo::CrossReplicaSumOp)

`mhlo.cstr_reshapable` (::mlir::mhlo::CstrReshapableOp)

`mhlo.custom_call` (::mlir::mhlo::CustomCallOp)

`mhlo.divide` (::mlir::mhlo::DivOp)

`mhlo.domain` (::mlir::mhlo::DomainOp)

`mhlo.dot_general` (::mlir::mhlo::DotGeneralOp)

`mhlo.dot` (::mlir::mhlo::DotOp)