llvm/mlir/lib/Dialect/GPU/Transforms/ShuffleRewriter.cpp

//===- ShuffleRewriter.cpp - Implementation of shuffle rewriting  ---------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements in-dialect rewriting of the shuffle op for types i64 and
// f64, rewriting 64bit shuffles into two 32bit shuffles. This particular
// implementation using shifts and truncations can be obtained using clang: by
// emitting IR for shuffle operations with `-O3`.
//
//===----------------------------------------------------------------------===//

#include "mlir/Dialect/Arith/IR/Arith.h"
#include "mlir/Dialect/GPU/IR/GPUDialect.h"
#include "mlir/Dialect/GPU/Transforms/Passes.h"
#include "mlir/IR/Builders.h"
#include "mlir/IR/PatternMatch.h"
#include "mlir/Pass/Pass.h"

usingnamespacemlir;

namespace {
struct GpuShuffleRewriter : public OpRewritePattern<gpu::ShuffleOp> { … };
} // namespace

void mlir::populateGpuShufflePatterns(RewritePatternSet &patterns) { … }