| 1 | //===- LowerVectorStep.cpp - Lower 'vector.step' operation ----------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | // |
| 9 | // This file implements target-independent rewrites and utilities to lower the |
| 10 | // 'vector.step' operation. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "mlir/Dialect/Arith/IR/Arith.h" |
| 15 | #include "mlir/Dialect/Vector/IR/VectorOps.h" |
| 16 | #include "mlir/Dialect/Vector/Transforms/LoweringPatterns.h" |
| 17 | #include "mlir/IR/PatternMatch.h" |
| 18 | |
| 19 | #define DEBUG_TYPE "vector-step-lowering" |
| 20 | |
| 21 | using namespace mlir; |
| 22 | using namespace mlir::vector; |
| 23 | |
| 24 | namespace { |
| 25 | |
| 26 | struct StepToArithConstantOpRewrite final : OpRewritePattern<vector::StepOp> { |
| 27 | using OpRewritePattern::OpRewritePattern; |
| 28 | |
| 29 | LogicalResult matchAndRewrite(vector::StepOp stepOp, |
| 30 | PatternRewriter &rewriter) const override { |
| 31 | auto resultType = cast<VectorType>(stepOp.getType()); |
| 32 | if (resultType.isScalable()) { |
| 33 | return failure(); |
| 34 | } |
| 35 | int64_t elementCount = resultType.getNumElements(); |
| 36 | SmallVector<APInt> indices = |
| 37 | llvm::map_to_vector(C: llvm::seq(Size: elementCount), |
| 38 | F: [](int64_t i) { return APInt(/*width=*/64, i); }); |
| 39 | rewriter.replaceOpWithNewOp<arith::ConstantOp>( |
| 40 | stepOp, DenseElementsAttr::get(resultType, indices)); |
| 41 | return success(); |
| 42 | } |
| 43 | }; |
| 44 | } // namespace |
| 45 | |
| 46 | void mlir::vector::populateVectorStepLoweringPatterns( |
| 47 | RewritePatternSet &patterns, PatternBenefit benefit) { |
| 48 | patterns.add<StepToArithConstantOpRewrite>(arg: patterns.getContext(), args&: benefit); |
| 49 | } |
| 50 |