| 1 | //===- GlobalIdRewriter.cpp - Implementation of GlobalId rewriting -------===// |
|---|---|
| 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 in-dialect rewriting of the global_id op for archs |
| 10 | // where global_id.x = threadId.x + blockId.x * blockDim.x |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "mlir/Dialect/GPU/IR/GPUDialect.h" |
| 15 | #include "mlir/Dialect/GPU/Transforms/Passes.h" |
| 16 | #include "mlir/Dialect/Index/IR/IndexOps.h" |
| 17 | #include "mlir/IR/PatternMatch.h" |
| 18 | |
| 19 | using namespace mlir; |
| 20 | |
| 21 | namespace { |
| 22 | struct GpuGlobalIdRewriter : public OpRewritePattern<gpu::GlobalIdOp> { |
| 23 | using OpRewritePattern<gpu::GlobalIdOp>::OpRewritePattern; |
| 24 | |
| 25 | LogicalResult matchAndRewrite(gpu::GlobalIdOp op, |
| 26 | PatternRewriter &rewriter) const override { |
| 27 | Location loc = op.getLoc(); |
| 28 | auto dim = op.getDimension(); |
| 29 | auto blockId = rewriter.create<gpu::BlockIdOp>(location: loc, args&: dim); |
| 30 | auto blockDim = rewriter.create<gpu::BlockDimOp>(location: loc, args&: dim); |
| 31 | // Compute blockId.x * blockDim.x |
| 32 | auto tmp = rewriter.create<index::MulOp>(location: op.getLoc(), args&: blockId, args&: blockDim); |
| 33 | auto threadId = rewriter.create<gpu::ThreadIdOp>(location: loc, args&: dim); |
| 34 | // Compute threadId.x + blockId.x * blockDim.x |
| 35 | rewriter.replaceOpWithNewOp<index::AddOp>(op, args&: threadId, args&: tmp); |
| 36 | return success(); |
| 37 | } |
| 38 | }; |
| 39 | } // namespace |
| 40 | |
| 41 | void mlir::populateGpuGlobalIdPatterns(RewritePatternSet &patterns) { |
| 42 | patterns.add<GpuGlobalIdRewriter>(arg: patterns.getContext()); |
| 43 | } |
| 44 |