308571074c
This is an artifact from merging MLIR into LLVM, the file headers are now aligned with the rest of the project.
101 lines
3.6 KiB
C++
101 lines
3.6 KiB
C++
//===- OpToFuncCallLowering.h - GPU ops lowering to custom calls *- C++ -*-===//
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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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#ifndef MLIR_CONVERSION_GPUCOMMON_OPTOFUNCCALLLOWERING_H_
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#define MLIR_CONVERSION_GPUCOMMON_OPTOFUNCCALLLOWERING_H_
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#include "mlir/Conversion/StandardToLLVM/ConvertStandardToLLVM.h"
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#include "mlir/Dialect/GPU/GPUDialect.h"
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#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
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#include "mlir/Dialect/StandardOps/Ops.h"
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#include "mlir/IR/Builders.h"
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namespace mlir {
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/// Rewriting that replace SourceOp with a CallOp to `f32Func` or `f64Func`
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/// depending on the element type that Op operates upon. The function
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/// declaration is added in case it was not added before.
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///
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/// Example with NVVM:
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/// %exp_f32 = std.exp %arg_f32 : f32
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///
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/// will be transformed into
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/// llvm.call @__nv_expf(%arg_f32) : (!llvm.float) -> !llvm.float
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template <typename SourceOp>
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struct OpToFuncCallLowering : public LLVMOpLowering {
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public:
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explicit OpToFuncCallLowering(LLVMTypeConverter &lowering_, StringRef f32Func,
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StringRef f64Func)
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: LLVMOpLowering(SourceOp::getOperationName(),
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lowering_.getDialect()->getContext(), lowering_),
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f32Func(f32Func), f64Func(f64Func) {}
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PatternMatchResult
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matchAndRewrite(Operation *op, ArrayRef<Value> operands,
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ConversionPatternRewriter &rewriter) const override {
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using LLVM::LLVMFuncOp;
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using LLVM::LLVMType;
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static_assert(
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std::is_base_of<OpTrait::OneResult<SourceOp>, SourceOp>::value,
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"expected single result op");
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LLVMType resultType = lowering.convertType(op->getResult(0).getType())
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.template cast<LLVM::LLVMType>();
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LLVMType funcType = getFunctionType(resultType, operands);
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StringRef funcName = getFunctionName(resultType);
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if (funcName.empty())
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return matchFailure();
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LLVMFuncOp funcOp = appendOrGetFuncOp(funcName, funcType, op);
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auto callOp = rewriter.create<LLVM::CallOp>(
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op->getLoc(), resultType, rewriter.getSymbolRefAttr(funcOp), operands);
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rewriter.replaceOp(op, {callOp.getResult(0)});
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return matchSuccess();
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}
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private:
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LLVM::LLVMType getFunctionType(LLVM::LLVMType resultType,
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ArrayRef<Value> operands) const {
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using LLVM::LLVMType;
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SmallVector<LLVMType, 1> operandTypes;
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for (Value operand : operands) {
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operandTypes.push_back(operand.getType().cast<LLVMType>());
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}
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return LLVMType::getFunctionTy(resultType, operandTypes,
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/*isVarArg=*/false);
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}
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StringRef getFunctionName(LLVM::LLVMType type) const {
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if (type.isFloatTy())
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return f32Func;
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if (type.isDoubleTy())
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return f64Func;
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return "";
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}
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LLVM::LLVMFuncOp appendOrGetFuncOp(StringRef funcName,
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LLVM::LLVMType funcType,
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Operation *op) const {
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using LLVM::LLVMFuncOp;
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Operation *funcOp = SymbolTable::lookupNearestSymbolFrom(op, funcName);
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if (funcOp)
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return cast<LLVMFuncOp>(*funcOp);
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mlir::OpBuilder b(op->getParentOfType<LLVMFuncOp>());
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return b.create<LLVMFuncOp>(op->getLoc(), funcName, funcType);
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}
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const std::string f32Func;
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const std::string f64Func;
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};
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} // namespace mlir
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#endif // MLIR_CONVERSION_GPUCOMMON_OPTOFUNCCALLLOWERING_H_
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