| 1 | //===- TensorCopyInsertion.cpp - Resolve Bufferization Conflicts w/ Copies ===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "mlir/Dialect/Bufferization/Transforms/Passes.h" |
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| 10 | |
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| 11 | #include "mlir/Dialect/Bufferization/IR/BufferizableOpInterface.h" |
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| 12 | #include "mlir/Dialect/Bufferization/IR/Bufferization.h" |
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| 13 | #include "mlir/Dialect/Bufferization/Transforms/Bufferize.h" |
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| 14 | #include "mlir/Dialect/Bufferization/Transforms/OneShotAnalysis.h" |
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| 15 | #include "mlir/Dialect/Bufferization/Transforms/OneShotModuleBufferize.h" |
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| 16 | #include "mlir/Dialect/Bufferization/Transforms/Transforms.h" |
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| 17 | #include "mlir/Dialect/Func/IR/FuncOps.h" |
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| 18 | |
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| 19 | namespace mlir { |
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| 20 | namespace bufferization { |
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| 21 | #define GEN_PASS_DEF_TENSORCOPYINSERTION |
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| 22 | #include "mlir/Dialect/Bufferization/Transforms/Passes.h.inc" |
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| 23 | } // namespace bufferization |
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| 24 | } // namespace mlir |
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| 25 | |
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| 26 | using namespace mlir; |
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| 27 | using namespace mlir::bufferization; |
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| 28 | |
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| 29 | LogicalResult mlir::bufferization::insertTensorCopies( |
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| 30 | Operation *op, const OneShotBufferizationOptions &options, |
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| 31 | const BufferizationState &bufferizationState, |
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| 32 | BufferizationStatistics *statistics) { |
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| 33 | OneShotAnalysisState analysisState(op, options); |
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| 34 | // Run normal One-Shot Bufferize analysis or One-Shot Module Bufferize |
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| 35 | // analysis depending on whether function boundary bufferization is enabled or |
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| 36 | // not. |
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| 37 | if (options.bufferizeFunctionBoundaries) { |
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| 38 | if (failed(analyzeModuleOp(cast<ModuleOp>(op), analysisState, statistics))) |
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| 39 | return failure(); |
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| 40 | } else { |
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| 41 | if (failed(Result: analyzeOp(op, state&: analysisState, statistics))) |
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| 42 | return failure(); |
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| 43 | } |
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| 44 | |
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| 45 | if (options.testAnalysisOnly) |
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| 46 | return success(); |
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| 47 | |
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| 48 | return insertTensorCopies(op, analysisState, bufferizationState); |
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| 49 | } |
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| 50 | |
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| 51 | LogicalResult mlir::bufferization::insertTensorCopies( |
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| 52 | Operation *op, const AnalysisState &analysisState, |
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| 53 | const BufferizationState &bufferizationState) { |
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| 54 | IRRewriter rewriter(op->getContext()); |
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| 55 | |
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| 56 | // It may be more efficient to walk in pre-order here, but the current |
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| 57 | // implementation visits regions of ops even if they are not allowed or |
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| 58 | // bufferizable, and existing tests rely on this behavior. |
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| 59 | // For now, only exclude nested operations if they are in a different symbol |
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| 60 | // table scope. |
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| 61 | WalkResult result = op->walk(callback: [&](Operation *nestedOp) { |
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| 62 | if (op->hasTrait<OpTrait::SymbolTable>() && |
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| 63 | nestedOp->getParentWithTrait<OpTrait::SymbolTable>() != op) |
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| 64 | return WalkResult::skip(); |
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| 65 | |
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| 66 | auto bufferizableOp = |
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| 67 | analysisState.getOptions().dynCastBufferizableOp(nestedOp); |
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| 68 | if (!bufferizableOp) |
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| 69 | return WalkResult::skip(); |
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| 70 | |
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| 71 | // Find inplacability conflicts and resolve them. (Typically with explicit |
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| 72 | // tensor copies in the form of AllocTensorOps.) |
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| 73 | rewriter.setInsertionPoint(nestedOp); |
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| 74 | if (failed(bufferizableOp.resolveConflicts(rewriter, analysisState, |
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| 75 | bufferizationState))) |
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| 76 | return WalkResult::interrupt(); |
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| 77 | |
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| 78 | return WalkResult::advance(); |
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| 79 | }); |
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| 80 | |
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| 81 | return failure(IsFailure: result.wasInterrupted()); |
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| 82 | } |
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| 83 | |
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