ac65b2c327
This patch impelemnts a rewrite pattern for transforming `gpu.subgroup_id` to: ``` subgroup_id = linearized_thread_id / gpu.subgroup_size ``` where: ``` linearized_thread_id = thread_id.x + block_dim.x * (thread_id.y + block_dim.y * thread_id.z) ```
46 lines
1.7 KiB
C++
46 lines
1.7 KiB
C++
//===- GlobalIdRewriter.cpp - Implementation of GlobalId rewriting -------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements in-dialect rewriting of the global_id op for archs
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// where global_id.x = threadId.x + blockId.x * blockDim.x
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/Dialect/GPU/IR/GPUDialect.h"
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#include "mlir/Dialect/GPU/Transforms/Passes.h"
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#include "mlir/Dialect/Index/IR/IndexOps.h"
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#include "mlir/IR/Builders.h"
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#include "mlir/IR/PatternMatch.h"
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#include "mlir/Pass/Pass.h"
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using namespace mlir;
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namespace {
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struct GpuGlobalIdRewriter : public OpRewritePattern<gpu::GlobalIdOp> {
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using OpRewritePattern<gpu::GlobalIdOp>::OpRewritePattern;
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LogicalResult matchAndRewrite(gpu::GlobalIdOp op,
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PatternRewriter &rewriter) const override {
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Location loc = op.getLoc();
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auto dim = op.getDimension();
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auto blockId = rewriter.create<gpu::BlockIdOp>(loc, dim);
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auto blockDim = rewriter.create<gpu::BlockDimOp>(loc, dim);
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// Compute blockId.x * blockDim.x
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auto tmp = rewriter.create<index::MulOp>(op.getLoc(), blockId, blockDim);
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auto threadId = rewriter.create<gpu::ThreadIdOp>(loc, dim);
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// Compute threadId.x + blockId.x * blockDim.x
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rewriter.replaceOpWithNewOp<index::AddOp>(op, threadId, tmp);
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return success();
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}
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};
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} // namespace
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void mlir::populateGpuGlobalIdPatterns(RewritePatternSet &patterns) {
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patterns.add<GpuGlobalIdRewriter>(patterns.getContext());
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}
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