| 1 | //===- XeGPUFoldAliasOps.cpp - XeGPU alias ops folders ----------*- C++ -*-===// |
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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/XeGPU/Transforms/Passes.h" |
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| 10 | |
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| 11 | #include "mlir/Dialect/Affine/ViewLikeInterfaceUtils.h" |
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| 12 | #include "mlir/Dialect/MemRef/IR/MemRef.h" |
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| 13 | #include "mlir/Dialect/XeGPU/IR/XeGPU.h" |
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| 14 | #include "mlir/Dialect/XeGPU/Transforms/Transforms.h" |
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| 15 | #include "mlir/Pass/Pass.h" |
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| 16 | #include "mlir/Transforms/GreedyPatternRewriteDriver.h" |
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| 17 | #include "llvm/Support/Debug.h" |
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| 18 | |
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| 19 | namespace mlir { |
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| 20 | namespace xegpu { |
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| 21 | #define GEN_PASS_DEF_XEGPUFOLDALIASOPS |
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| 22 | #include "mlir/Dialect/XeGPU/Transforms/Passes.h.inc" |
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| 23 | } // namespace xegpu |
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| 24 | } // namespace mlir |
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| 25 | |
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| 26 | #define DEBUG_TYPE "xegpu-fold-alias-ops" |
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| 27 | #define DBGS() (llvm::dbgs() << "[" DEBUG_TYPE "]: ") |
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| 28 | |
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| 29 | using namespace mlir; |
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| 30 | |
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| 31 | namespace { |
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| 32 | /// Merges subview operation with xegpu.create_nd_tdesc operation. |
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| 33 | class XegpuCreateNdDescOpSubViewOpFolder final |
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| 34 | : public OpRewritePattern<xegpu::CreateNdDescOp> { |
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| 35 | public: |
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| 36 | using OpRewritePattern<xegpu::CreateNdDescOp>::OpRewritePattern; |
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| 37 | |
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| 38 | LogicalResult matchAndRewrite(xegpu::CreateNdDescOp descOp, |
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| 39 | PatternRewriter &rewriter) const override; |
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| 40 | }; |
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| 41 | } // namespace |
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| 42 | |
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| 43 | LogicalResult XegpuCreateNdDescOpSubViewOpFolder::matchAndRewrite( |
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| 44 | xegpu::CreateNdDescOp descOp, PatternRewriter &rewriter) const { |
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| 45 | auto subViewOp = descOp.getSource().getDefiningOp<memref::SubViewOp>(); |
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| 46 | |
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| 47 | if (!subViewOp) |
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| 48 | return rewriter.notifyMatchFailure(descOp, "not a subview producer" ); |
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| 49 | if (!subViewOp.hasUnitStride()) |
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| 50 | return rewriter.notifyMatchFailure(descOp, "requires unit strides" ); |
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| 51 | |
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| 52 | SmallVector<Value> resolvedOffsets; |
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| 53 | affine::resolveIndicesIntoOpWithOffsetsAndStrides( |
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| 54 | rewriter, descOp.getLoc(), subViewOp.getMixedOffsets(), |
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| 55 | subViewOp.getMixedStrides(), subViewOp.getDroppedDims(), |
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| 56 | descOp.getMixedOffsets(), resolvedOffsets); |
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| 57 | |
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| 58 | rewriter.replaceOpWithNewOp<xegpu::CreateNdDescOp>( |
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| 59 | descOp, descOp.getTensorDesc().getType(), subViewOp.getSource(), |
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| 60 | getAsOpFoldResult(resolvedOffsets)); |
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| 61 | |
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| 62 | return success(); |
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| 63 | } |
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| 64 | |
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| 65 | void xegpu::populateXeGPUFoldAliasOpsPatterns(RewritePatternSet &patterns) { |
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| 66 | patterns.add<XegpuCreateNdDescOpSubViewOpFolder>(arg: patterns.getContext()); |
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| 67 | } |
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| 68 | |
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| 69 | namespace { |
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| 70 | |
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| 71 | struct XeGPUFoldAliasOpsPass final |
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| 72 | : public xegpu::impl::XeGPUFoldAliasOpsBase<XeGPUFoldAliasOpsPass> { |
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| 73 | void runOnOperation() override; |
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| 74 | }; |
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| 75 | |
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| 76 | } // namespace |
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| 77 | |
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| 78 | void XeGPUFoldAliasOpsPass::runOnOperation() { |
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| 79 | RewritePatternSet patterns(&getContext()); |
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| 80 | xegpu::populateXeGPUFoldAliasOpsPatterns(patterns); |
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| 81 | (void)applyPatternsGreedily(getOperation(), std::move(patterns)); |
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| 82 | } |
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| 83 | |
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