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//===- IndexIntrinsicsOpLowering.h - GPU IndexOps Lowering class *- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef MLIR_CONVERSION_GPUCOMMON_INDEXINTRINSICSOPLOWERING_H_
#define MLIR_CONVERSION_GPUCOMMON_INDEXINTRINSICSOPLOWERING_H_
#include "mlir/Conversion/LLVMCommon/Pattern.h"
#include "mlir/Dialect/GPU/IR/GPUDialect.h"
#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
#include "mlir/IR/BuiltinAttributes.h"
namespace mlir {
// Rewriting that replaces Op with XOp, YOp, or ZOp depending on the dimension
// that Op operates on. Op is assumed to return an `index` value and
// XOp, YOp and ZOp are assumed to return an `llvm.i32` value. Depending on
// `indexBitwidth`, sign-extend or truncate the resulting value to match the
// bitwidth expected by the consumers of the value.
template <typename Op, typename XOp, typename YOp, typename ZOp>
struct GPUIndexIntrinsicOpLowering : public ConvertOpToLLVMPattern<Op> {
private:
unsigned indexBitwidth;
StringRef boundsAttrName;
public:
explicit GPUIndexIntrinsicOpLowering(LLVMTypeConverter &typeConverter)
: ConvertOpToLLVMPattern<Op>(typeConverter),
indexBitwidth(typeConverter.getIndexTypeBitwidth()),
boundsAttrName("") {}
explicit GPUIndexIntrinsicOpLowering(LLVMTypeConverter &typeConverter,
StringRef boundsAttrName)
: ConvertOpToLLVMPattern<Op>(typeConverter),
indexBitwidth(typeConverter.getIndexTypeBitwidth()),
boundsAttrName(boundsAttrName) {}
// Convert the kernel arguments to an LLVM type, preserve the rest.
LogicalResult
matchAndRewrite(Op op, typename Op::Adaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
auto loc = op->getLoc();
MLIRContext *context = rewriter.getContext();
Operation *newOp;
switch (op.getDimension()) {
case gpu::Dimension::x:
newOp = rewriter.create<XOp>(loc, IntegerType::get(context, 32));
break;
case gpu::Dimension::y:
newOp = rewriter.create<YOp>(loc, IntegerType::get(context, 32));
break;
case gpu::Dimension::z:
newOp = rewriter.create<ZOp>(loc, IntegerType::get(context, 32));
break;
}
Operation *function;
if (auto gpuFunc = op->template getParentOfType<gpu::GPUFuncOp>())
function = gpuFunc;
if (auto llvmFunc = op->template getParentOfType<LLVM::LLVMFuncOp>())
function = llvmFunc;
if (!boundsAttrName.empty() && function) {
if (auto attr = function->template getAttrOfType<DenseI32ArrayAttr>(
boundsAttrName)) {
int32_t maximum = attr[static_cast<uint32_t>(op.getDimension())];
newOp->setAttr("range", rewriter.getDenseI32ArrayAttr({0, maximum}));
}
}
if (indexBitwidth > 32) {
newOp = rewriter.create<LLVM::SExtOp>(
loc, IntegerType::get(context, indexBitwidth), newOp->getResult(0));
} else if (indexBitwidth < 32) {
newOp = rewriter.create<LLVM::TruncOp>(
loc, IntegerType::get(context, indexBitwidth), newOp->getResult(0));
}
rewriter.replaceOp(op, newOp->getResults());
return success();
}
};
} // namespace mlir
#endif // MLIR_CONVERSION_GPUCOMMON_INDEXINTRINSICSOPLOWERING_H_
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