71 lines
2.4 KiB
C++
71 lines
2.4 KiB
C++
//===- ReplaceConstant.cpp - Replace LLVM constant expression--------------===//
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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 a utility function for replacing LLVM constant
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// expressions by instructions.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/ReplaceConstant.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/NoFolder.h"
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namespace llvm {
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// Replace a constant expression by instructions with equivalent operations at
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// a specified location.
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Instruction *createReplacementInstr(ConstantExpr *CE, Instruction *Instr) {
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IRBuilder<NoFolder> Builder(Instr);
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unsigned OpCode = CE->getOpcode();
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switch (OpCode) {
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case Instruction::GetElementPtr: {
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SmallVector<Value *, 4> CEOpVec(CE->operands());
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ArrayRef<Value *> CEOps(CEOpVec);
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return dyn_cast<Instruction>(
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Builder.CreateInBoundsGEP(cast<GEPOperator>(CE)->getSourceElementType(),
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CEOps[0], CEOps.slice(1)));
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}
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case Instruction::Add:
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case Instruction::Sub:
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case Instruction::Mul:
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case Instruction::UDiv:
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case Instruction::SDiv:
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case Instruction::FDiv:
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case Instruction::URem:
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case Instruction::SRem:
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case Instruction::FRem:
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case Instruction::Shl:
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case Instruction::LShr:
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case Instruction::AShr:
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case Instruction::And:
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case Instruction::Or:
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case Instruction::Xor:
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return dyn_cast<Instruction>(
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Builder.CreateBinOp((Instruction::BinaryOps)OpCode, CE->getOperand(0),
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CE->getOperand(1), CE->getName()));
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case Instruction::Trunc:
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case Instruction::ZExt:
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case Instruction::SExt:
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case Instruction::FPToUI:
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case Instruction::FPToSI:
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case Instruction::UIToFP:
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case Instruction::SIToFP:
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case Instruction::FPTrunc:
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case Instruction::FPExt:
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case Instruction::PtrToInt:
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case Instruction::IntToPtr:
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case Instruction::BitCast:
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return dyn_cast<Instruction>(
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Builder.CreateCast((Instruction::CastOps)OpCode, CE->getOperand(0),
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CE->getType(), CE->getName()));
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default:
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llvm_unreachable("Unhandled constant expression!\n");
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}
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}
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} // namespace llvm
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