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[mlir] Implement a memory-space cast bubbling-down transform #159454
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[mlir] Implement memory-space cast operand fusion into consumers
fabianmcg 3709f67
address comments 1/2
fabianmcg 4789d11
address comements 2/2
fabianmcg 7a881b6
Update mlir/include/mlir/Interfaces/MemOpInterfaces.td
fabianmcg 7f4a7f9
fix benefit
fabianmcg 150b791
Update mlir/include/mlir/Interfaces/MemOpInterfaces.td
fabianmcg 231ae13
fix build
fabianmcg 1321454
rename isLosslesscast method
fabianmcg d753be0
use std::optional in bubbleDownCasts
fabianmcg e70b0f2
improve docs
fabianmcg 2e5ff23
address reviewer comments
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| //===- MemOpInterfaces.h - Memory operation interfaces ----------*- C++ -*-===// | ||
| // | ||
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | ||
| // See https://llvm.org/LICENSE.txt for license information. | ||
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
| // | ||
| // This file contains declarations of interfaces for operations that interact | ||
| // with memory. | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| #ifndef MLIR_INTERFACES_MEMOPINTERFACES_H | ||
| #define MLIR_INTERFACES_MEMOPINTERFACES_H | ||
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| #include "mlir/IR/OpDefinition.h" | ||
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| namespace mlir { | ||
| namespace detail { | ||
| /// Attempt to verify the given memory space cast operation. | ||
| LogicalResult verifyMemorySpaceCastOpInterface(Operation *op); | ||
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| /// Tries to fuse inplace a `MemorySpaceCastOpInterface` operation referenced by | ||
| /// `operand`. On success, it returns `results`, and sets `modifiedInPlace` to | ||
| /// true. It returns failure if `operand` doesn't reference a | ||
| /// `MemorySpaceCastOpInterface` op. | ||
| FailureOr<SmallVector<Value>> | ||
| fuseInPlaceMemorySpaceCastImpl(OpOperand &operand, ValueRange results, | ||
| bool &modifiedInPlace); | ||
| } // namespace detail | ||
| } // namespace mlir | ||
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| /// Include the generated interface declarations. | ||
| #include "mlir/Interfaces/MemOpInterfaces.h.inc" | ||
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| #endif // MLIR_INTERFACES_MEMOPINTERFACES_H |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| //===- MemOpInterfaces.td - Memory operation interfaces -----*- tablegen -*-===// | ||
| // | ||
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | ||
| // See https://llvm.org/LICENSE.txt for license information. | ||
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
| // | ||
| // This file contains interfaces for operations that interact with memory. | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| #ifndef MLIR_INTERFACES_MEMOPINTERFACES_TD | ||
| #define MLIR_INTERFACES_MEMOPINTERFACES_TD | ||
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| include "mlir/IR/OpBase.td" | ||
| include "mlir/Interfaces/SideEffectInterfaces.td" | ||
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| def FuseMemorySpaceCastConsumerOpInterface : | ||
| OpInterface<"FuseMemorySpaceCastConsumerOpInterface"> { | ||
| let description = [{ | ||
| An interface to fuse memory-space cast operands into a consumer operation. | ||
| It is the responsibility of the interface to determine which casts can be | ||
| fused into the operation. | ||
| }]; | ||
| let cppNamespace = "::mlir"; | ||
| let methods = [ | ||
| InterfaceMethod<[{ | ||
| Attempt to fuse the incoming cast-like operands. Returns `success` | ||
| and any new results on fusion success, otherwise it returns failure. | ||
| If new results are produced, these must be compatible with the original | ||
| operation results. | ||
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| The `modifiedInPlace` parameter indicates whether the operation was | ||
| modified in place. If `false` and the fusion succeeded, then the | ||
| interface guarantees it is valid to erase the original operation. | ||
| If `true`, then the interface must guarantee no operations were created | ||
| by the method, and that no further IR modification is necessary. It is | ||
| considered an error if `modifiedInPlace` is true and the fusion failed. | ||
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| Any implementations of this method must not erase/replace the original | ||
| operation, instead it is the caller responsibility to erase or replace | ||
| the op with the results provided by the method. | ||
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| Finally, any implementations of this method have to guarantee that the | ||
| IR remains valid at all times. | ||
| }], | ||
| "::llvm::FailureOr<::llvm::SmallVector<::mlir::Value>>", "fuseCastOperands", | ||
| (ins "::mlir::OpBuilder &":$builder, "bool &":$modifiedInPlace) | ||
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| >, | ||
| ]; | ||
| } | ||
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| def MemorySpaceCastOpInterface : OpInterface<"MemorySpaceCastOpInterface"> { | ||
| let description = [{ | ||
| An interface for operations that perform memory-space casts. This | ||
| interface assumes that the cast operation is `pure`. | ||
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| These operations expect to have a well-defined ptr-like operand, and | ||
| a well-defined target ptr-like result. | ||
| }]; | ||
| let cppNamespace = "::mlir"; | ||
| let methods = [ | ||
| InterfaceMethod<[{ | ||
| Returns the source ptr-like value. | ||
| }], | ||
| "::mlir::TypedValue<::mlir::PtrLikeTypeInterface>", "getSourcePtr" | ||
| >, | ||
| InterfaceMethod<[{ | ||
| Returns the target ptr-like value. | ||
| }], | ||
| "::mlir::TypedValue<::mlir::PtrLikeTypeInterface>", "getTargetPtr" | ||
| >, | ||
| InterfaceMethod<[{ | ||
| Returns whether the memory space cast specified by `tgt` and `src` | ||
| is supported. | ||
| }], | ||
| "bool", "isValidMemorySpaceCast", | ||
| (ins "::mlir::PtrLikeTypeInterface":$tgt, | ||
| "::mlir::PtrLikeTypeInterface":$src) | ||
| >, | ||
| InterfaceMethod<[{ | ||
| Clones the memory space cast op with the given source and target type. | ||
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| }], | ||
| "::mlir::MemorySpaceCastOpInterface", "cloneMemorySpaceCastOp", | ||
| (ins "::mlir::OpBuilder &":$builder, "::mlir::Type":$tgt, | ||
| "::mlir::Value":$src) | ||
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| >, | ||
| InterfaceMethod<[{ | ||
| Returns whether the cast allows to be fused. | ||
| }], | ||
| "bool", "isFusableMemorySpaceCast" | ||
| > | ||
| ]; | ||
| let verify = [{ | ||
| return ::mlir::detail::verifyMemorySpaceCastOpInterface($_op); | ||
| }]; | ||
| let dependentTraits = [Pure]; | ||
| let extraClassDeclaration = [{ | ||
| /// Returns the underlying `MemorySpaceCastOpInterface` op if `value` | ||
| /// is produced by a `MemorySpaceCastOpInterface` op, and | ||
| /// `isFusableMemorySpaceCast` returns true, otherwise it returns null. | ||
| static ::mlir::MemorySpaceCastOpInterface | ||
| getIfFusableCast(::mlir::Value value) { | ||
| auto op = ::llvm::dyn_cast_or_null<::mlir::MemorySpaceCastOpInterface>( | ||
| value.getDefiningOp()); | ||
| if (!op || !op.isFusableMemorySpaceCast()) | ||
| return nullptr; | ||
| return op; | ||
| } | ||
| }]; | ||
| } | ||
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| #endif // MLIR_INTERFACES_MEMOPINTERFACES_TD | ||
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