unittests/Transforms/Utils/IntegerDivision.cpp

   1 //===- IntegerDivision.cpp - Unit tests for the integer division code -----===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "gtest/gtest.h"
  11 #include "llvm/BasicBlock.h"
  12 #include "llvm/GlobalValue.h"
  13 #include "llvm/Function.h"
  14 #include "llvm/IRBuilder.h"
  15 #include "llvm/Module.h"
  16 #include "llvm/Transforms/Utils/IntegerDivision.h"
  17
  18 using namespace llvm;
  19
  20 namespace {
  21
  22 TEST(IntegerDivision, SDiv) {
  23   LLVMContext &C(getGlobalContext());
  24   Module M("test division", C);
  25   IRBuilder<> Builder(C);
  26
  27   SmallVector<Type*, 2> ArgTys(2, Builder.getInt32Ty());
  28   Function *F = Function::Create(FunctionType::get(Builder.getInt32Ty(),
  29                                                    ArgTys, false),
  30                                  GlobalValue::ExternalLinkage, "F", &M);
  31   assert(F->getArgumentList().size() == 2);
  32
  33   BasicBlock *BB = BasicBlock::Create(C, "", F);
  34   Builder.SetInsertPoint(BB);
  35
  36   Function::arg_iterator AI = F->arg_begin();
  37   Value *A = AI++;
  38   Value *B = AI++;
  39
  40   Value *Div = Builder.CreateSDiv(A, B);
  41   EXPECT_TRUE(BB->front().getOpcode() == Instruction::SDiv);
  42
  43   Value *Ret = Builder.CreateRet(Div);
  44
  45   expandDivision(cast<BinaryOperator>(Div));
  46   EXPECT_TRUE(BB->front().getOpcode() == Instruction::AShr);
  47
  48   Instruction* Quotient = dyn_cast<Instruction>(cast<User>(Ret)->getOperand(0));
  49   EXPECT_TRUE(Quotient && Quotient->getOpcode() == Instruction::Sub);
  50
  51   Builder.SetInsertPoint(BB->end());
  52 }
  53
  54 TEST(IntegerDivision, UDiv) {
  55   LLVMContext &C(getGlobalContext());
  56   Module M("test division", C);
  57   IRBuilder<> Builder(C);
  58
  59   SmallVector<Type*, 2> ArgTys(2, Builder.getInt32Ty());
  60   Function *F = Function::Create(FunctionType::get(Builder.getInt32Ty(),
  61                                                    ArgTys, false),
  62                                  GlobalValue::ExternalLinkage, "F", &M);
  63   assert(F->getArgumentList().size() == 2);
  64
  65   BasicBlock *BB = BasicBlock::Create(C, "", F);
  66   Builder.SetInsertPoint(BB);
  67
  68   Function::arg_iterator AI = F->arg_begin();
  69   Value *A = AI++;
  70   Value *B = AI++;
  71
  72   Value *Div = Builder.CreateUDiv(A, B);
  73   EXPECT_TRUE(BB->front().getOpcode() == Instruction::UDiv);
  74
  75   Value *Ret = Builder.CreateRet(Div);
  76
  77   expandDivision(cast<BinaryOperator>(Div));
  78   EXPECT_TRUE(BB->front().getOpcode() == Instruction::ICmp);
  79
  80   Instruction* Quotient = dyn_cast<Instruction>(cast<User>(Ret)->getOperand(0));
  81   EXPECT_TRUE(Quotient && Quotient->getOpcode() == Instruction::PHI);
  82
  83   Builder.SetInsertPoint(BB->end());
  84 }
  85
  86
  87 TEST(IntegerDivision, SRem) {
  88   LLVMContext &C(getGlobalContext());
  89   Module M("test remainder", C);
  90   IRBuilder<> Builder(C);
  91
  92   SmallVector<Type*, 2> ArgTys(2, Builder.getInt32Ty());
  93   Function *F = Function::Create(FunctionType::get(Builder.getInt32Ty(),
  94                                                    ArgTys, false),
  95                                  GlobalValue::ExternalLinkage, "F", &M);
  96   assert(F->getArgumentList().size() == 2);
  97
  98   BasicBlock *BB = BasicBlock::Create(C, "", F);
  99   Builder.SetInsertPoint(BB);
 100
 101   Function::arg_iterator AI = F->arg_begin();
 102   Value *A = AI++;
 103   Value *B = AI++;
 104
 105   Value *Rem = Builder.CreateSRem(A, B);
 106   EXPECT_TRUE(BB->front().getOpcode() == Instruction::SRem);
 107
 108   Value *Ret = Builder.CreateRet(Rem);
 109
 110   expandRemainder(cast<BinaryOperator>(Rem));
 111   EXPECT_TRUE(BB->front().getOpcode() == Instruction::AShr);
 112
 113   Instruction* Remainder = dyn_cast<Instruction>(cast<User>(Ret)->getOperand(0));
 114   EXPECT_TRUE(Remainder && Remainder->getOpcode() == Instruction::Sub);
 115
 116   Builder.SetInsertPoint(BB->end());
 117 }
 118
 119 TEST(IntegerDivision, URem) {
 120   LLVMContext &C(getGlobalContext());
 121   Module M("test remainder", C);
 122   IRBuilder<> Builder(C);
 123
 124   SmallVector<Type*, 2> ArgTys(2, Builder.getInt32Ty());
 125   Function *F = Function::Create(FunctionType::get(Builder.getInt32Ty(),
 126                                                    ArgTys, false),
 127                                  GlobalValue::ExternalLinkage, "F", &M);
 128   assert(F->getArgumentList().size() == 2);
 129
 130   BasicBlock *BB = BasicBlock::Create(C, "", F);
 131   Builder.SetInsertPoint(BB);
 132
 133   Function::arg_iterator AI = F->arg_begin();
 134   Value *A = AI++;
 135   Value *B = AI++;
 136
 137   Value *Rem = Builder.CreateURem(A, B);
 138   EXPECT_TRUE(BB->front().getOpcode() == Instruction::URem);
 139
 140   Value *Ret = Builder.CreateRet(Rem);
 141
 142   expandRemainder(cast<BinaryOperator>(Rem));
 143   EXPECT_TRUE(BB->front().getOpcode() == Instruction::ICmp);
 144
 145   Instruction* Remainder = dyn_cast<Instruction>(cast<User>(Ret)->getOperand(0));
 146   EXPECT_TRUE(Remainder && Remainder->getOpcode() == Instruction::Sub);
 147
 148   Builder.SetInsertPoint(BB->end());
 149 }
 150
 151 }