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//===- IntegerDivision.cpp - Unit tests for the integer division code -----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Utils/IntegerDivision.h"
#include "llvm/BasicBlock.h"
#include "llvm/Function.h"
#include "llvm/GlobalValue.h"
#include "llvm/IRBuilder.h"
#include "llvm/Module.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
TEST(IntegerDivision, SDiv) {
LLVMContext &C(getGlobalContext());
Module M("test division", C);
IRBuilder<> Builder(C);
SmallVector<Type*, 2> ArgTys(2, Builder.getInt32Ty());
Function *F = Function::Create(FunctionType::get(Builder.getInt32Ty(),
ArgTys, false),
GlobalValue::ExternalLinkage, "F", &M);
assert(F->getArgumentList().size() == 2);
BasicBlock *BB = BasicBlock::Create(C, "", F);
Builder.SetInsertPoint(BB);
Function::arg_iterator AI = F->arg_begin();
Value *A = AI++;
Value *B = AI++;
Value *Div = Builder.CreateSDiv(A, B);
EXPECT_TRUE(BB->front().getOpcode() == Instruction::SDiv);
Value *Ret = Builder.CreateRet(Div);
expandDivision(cast<BinaryOperator>(Div));
EXPECT_TRUE(BB->front().getOpcode() == Instruction::AShr);
Instruction* Quotient = dyn_cast<Instruction>(cast<User>(Ret)->getOperand(0));
EXPECT_TRUE(Quotient && Quotient->getOpcode() == Instruction::Sub);
}
TEST(IntegerDivision, UDiv) {
LLVMContext &C(getGlobalContext());
Module M("test division", C);
IRBuilder<> Builder(C);
SmallVector<Type*, 2> ArgTys(2, Builder.getInt32Ty());
Function *F = Function::Create(FunctionType::get(Builder.getInt32Ty(),
ArgTys, false),
GlobalValue::ExternalLinkage, "F", &M);
assert(F->getArgumentList().size() == 2);
BasicBlock *BB = BasicBlock::Create(C, "", F);
Builder.SetInsertPoint(BB);
Function::arg_iterator AI = F->arg_begin();
Value *A = AI++;
Value *B = AI++;
Value *Div = Builder.CreateUDiv(A, B);
EXPECT_TRUE(BB->front().getOpcode() == Instruction::UDiv);
Value *Ret = Builder.CreateRet(Div);
expandDivision(cast<BinaryOperator>(Div));
EXPECT_TRUE(BB->front().getOpcode() == Instruction::ICmp);
Instruction* Quotient = dyn_cast<Instruction>(cast<User>(Ret)->getOperand(0));
EXPECT_TRUE(Quotient && Quotient->getOpcode() == Instruction::PHI);
}
TEST(IntegerDivision, SRem) {
LLVMContext &C(getGlobalContext());
Module M("test remainder", C);
IRBuilder<> Builder(C);
SmallVector<Type*, 2> ArgTys(2, Builder.getInt32Ty());
Function *F = Function::Create(FunctionType::get(Builder.getInt32Ty(),
ArgTys, false),
GlobalValue::ExternalLinkage, "F", &M);
assert(F->getArgumentList().size() == 2);
BasicBlock *BB = BasicBlock::Create(C, "", F);
Builder.SetInsertPoint(BB);
Function::arg_iterator AI = F->arg_begin();
Value *A = AI++;
Value *B = AI++;
Value *Rem = Builder.CreateSRem(A, B);
EXPECT_TRUE(BB->front().getOpcode() == Instruction::SRem);
Value *Ret = Builder.CreateRet(Rem);
expandRemainder(cast<BinaryOperator>(Rem));
EXPECT_TRUE(BB->front().getOpcode() == Instruction::AShr);
Instruction* Remainder = dyn_cast<Instruction>(cast<User>(Ret)->getOperand(0));
EXPECT_TRUE(Remainder && Remainder->getOpcode() == Instruction::Sub);
}
TEST(IntegerDivision, URem) {
LLVMContext &C(getGlobalContext());
Module M("test remainder", C);
IRBuilder<> Builder(C);
SmallVector<Type*, 2> ArgTys(2, Builder.getInt32Ty());
Function *F = Function::Create(FunctionType::get(Builder.getInt32Ty(),
ArgTys, false),
GlobalValue::ExternalLinkage, "F", &M);
assert(F->getArgumentList().size() == 2);
BasicBlock *BB = BasicBlock::Create(C, "", F);
Builder.SetInsertPoint(BB);
Function::arg_iterator AI = F->arg_begin();
Value *A = AI++;
Value *B = AI++;
Value *Rem = Builder.CreateURem(A, B);
EXPECT_TRUE(BB->front().getOpcode() == Instruction::URem);
Value *Ret = Builder.CreateRet(Rem);
expandRemainder(cast<BinaryOperator>(Rem));
EXPECT_TRUE(BB->front().getOpcode() == Instruction::ICmp);
Instruction* Remainder = dyn_cast<Instruction>(cast<User>(Ret)->getOperand(0));
EXPECT_TRUE(Remainder && Remainder->getOpcode() == Instruction::Sub);
}
}
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