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