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      1 //===- llvm/unittest/IR/InstructionsTest.cpp - Instructions unit tests ----===//
      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 "llvm/IR/Instructions.h"
     11 #include "llvm/ADT/STLExtras.h"
     12 #include "llvm/Analysis/ValueTracking.h"
     13 #include "llvm/IR/BasicBlock.h"
     14 #include "llvm/IR/Constants.h"
     15 #include "llvm/IR/DataLayout.h"
     16 #include "llvm/IR/DerivedTypes.h"
     17 #include "llvm/IR/IRBuilder.h"
     18 #include "llvm/IR/LLVMContext.h"
     19 #include "llvm/IR/MDBuilder.h"
     20 #include "llvm/IR/Operator.h"
     21 #include "gtest/gtest.h"
     22 
     23 namespace llvm {
     24 namespace {
     25 
     26 TEST(InstructionsTest, ReturnInst) {
     27   LLVMContext &C(getGlobalContext());
     28 
     29   // test for PR6589
     30   const ReturnInst* r0 = ReturnInst::Create(C);
     31   EXPECT_EQ(r0->getNumOperands(), 0U);
     32   EXPECT_EQ(r0->op_begin(), r0->op_end());
     33 
     34   IntegerType* Int1 = IntegerType::get(C, 1);
     35   Constant* One = ConstantInt::get(Int1, 1, true);
     36   const ReturnInst* r1 = ReturnInst::Create(C, One);
     37   EXPECT_EQ(1U, r1->getNumOperands());
     38   User::const_op_iterator b(r1->op_begin());
     39   EXPECT_NE(r1->op_end(), b);
     40   EXPECT_EQ(One, *b);
     41   EXPECT_EQ(One, r1->getOperand(0));
     42   ++b;
     43   EXPECT_EQ(r1->op_end(), b);
     44 
     45   // clean up
     46   delete r0;
     47   delete r1;
     48 }
     49 
     50 TEST(InstructionsTest, BranchInst) {
     51   LLVMContext &C(getGlobalContext());
     52 
     53   // Make a BasicBlocks
     54   BasicBlock* bb0 = BasicBlock::Create(C);
     55   BasicBlock* bb1 = BasicBlock::Create(C);
     56 
     57   // Mandatory BranchInst
     58   const BranchInst* b0 = BranchInst::Create(bb0);
     59 
     60   EXPECT_TRUE(b0->isUnconditional());
     61   EXPECT_FALSE(b0->isConditional());
     62   EXPECT_EQ(1U, b0->getNumSuccessors());
     63 
     64   // check num operands
     65   EXPECT_EQ(1U, b0->getNumOperands());
     66 
     67   EXPECT_NE(b0->op_begin(), b0->op_end());
     68   EXPECT_EQ(b0->op_end(), llvm::next(b0->op_begin()));
     69 
     70   EXPECT_EQ(b0->op_end(), llvm::next(b0->op_begin()));
     71 
     72   IntegerType* Int1 = IntegerType::get(C, 1);
     73   Constant* One = ConstantInt::get(Int1, 1, true);
     74 
     75   // Conditional BranchInst
     76   BranchInst* b1 = BranchInst::Create(bb0, bb1, One);
     77 
     78   EXPECT_FALSE(b1->isUnconditional());
     79   EXPECT_TRUE(b1->isConditional());
     80   EXPECT_EQ(2U, b1->getNumSuccessors());
     81 
     82   // check num operands
     83   EXPECT_EQ(3U, b1->getNumOperands());
     84 
     85   User::const_op_iterator b(b1->op_begin());
     86 
     87   // check COND
     88   EXPECT_NE(b, b1->op_end());
     89   EXPECT_EQ(One, *b);
     90   EXPECT_EQ(One, b1->getOperand(0));
     91   EXPECT_EQ(One, b1->getCondition());
     92   ++b;
     93 
     94   // check ELSE
     95   EXPECT_EQ(bb1, *b);
     96   EXPECT_EQ(bb1, b1->getOperand(1));
     97   EXPECT_EQ(bb1, b1->getSuccessor(1));
     98   ++b;
     99 
    100   // check THEN
    101   EXPECT_EQ(bb0, *b);
    102   EXPECT_EQ(bb0, b1->getOperand(2));
    103   EXPECT_EQ(bb0, b1->getSuccessor(0));
    104   ++b;
    105 
    106   EXPECT_EQ(b1->op_end(), b);
    107 
    108   // clean up
    109   delete b0;
    110   delete b1;
    111 
    112   delete bb0;
    113   delete bb1;
    114 }
    115 
    116 TEST(InstructionsTest, CastInst) {
    117   LLVMContext &C(getGlobalContext());
    118 
    119   Type* Int8Ty = Type::getInt8Ty(C);
    120   Type* Int64Ty = Type::getInt64Ty(C);
    121   Type* V8x8Ty = VectorType::get(Int8Ty, 8);
    122   Type* V8x64Ty = VectorType::get(Int64Ty, 8);
    123   Type* X86MMXTy = Type::getX86_MMXTy(C);
    124 
    125   const Constant* c8 = Constant::getNullValue(V8x8Ty);
    126   const Constant* c64 = Constant::getNullValue(V8x64Ty);
    127 
    128   EXPECT_TRUE(CastInst::isCastable(V8x8Ty, X86MMXTy));
    129   EXPECT_TRUE(CastInst::isCastable(X86MMXTy, V8x8Ty));
    130   EXPECT_FALSE(CastInst::isCastable(Int64Ty, X86MMXTy));
    131   EXPECT_TRUE(CastInst::isCastable(V8x64Ty, V8x8Ty));
    132   EXPECT_TRUE(CastInst::isCastable(V8x8Ty, V8x64Ty));
    133   EXPECT_EQ(CastInst::Trunc, CastInst::getCastOpcode(c64, true, V8x8Ty, true));
    134   EXPECT_EQ(CastInst::SExt, CastInst::getCastOpcode(c8, true, V8x64Ty, true));
    135 }
    136 
    137 
    138 
    139 TEST(InstructionsTest, VectorGep) {
    140   LLVMContext &C(getGlobalContext());
    141 
    142   // Type Definitions
    143   PointerType *Ptri8Ty = PointerType::get(IntegerType::get(C, 8), 0);
    144   PointerType *Ptri32Ty = PointerType::get(IntegerType::get(C, 8), 0);
    145 
    146   VectorType *V2xi8PTy = VectorType::get(Ptri8Ty, 2);
    147   VectorType *V2xi32PTy = VectorType::get(Ptri32Ty, 2);
    148 
    149   // Test different aspects of the vector-of-pointers type
    150   // and GEPs which use this type.
    151   ConstantInt *Ci32a = ConstantInt::get(C, APInt(32, 1492));
    152   ConstantInt *Ci32b = ConstantInt::get(C, APInt(32, 1948));
    153   std::vector<Constant*> ConstVa(2, Ci32a);
    154   std::vector<Constant*> ConstVb(2, Ci32b);
    155   Constant *C2xi32a = ConstantVector::get(ConstVa);
    156   Constant *C2xi32b = ConstantVector::get(ConstVb);
    157 
    158   CastInst *PtrVecA = new IntToPtrInst(C2xi32a, V2xi32PTy);
    159   CastInst *PtrVecB = new IntToPtrInst(C2xi32b, V2xi32PTy);
    160 
    161   ICmpInst *ICmp0 = new ICmpInst(ICmpInst::ICMP_SGT, PtrVecA, PtrVecB);
    162   ICmpInst *ICmp1 = new ICmpInst(ICmpInst::ICMP_ULT, PtrVecA, PtrVecB);
    163   EXPECT_NE(ICmp0, ICmp1); // suppress warning.
    164 
    165   BasicBlock* BB0 = BasicBlock::Create(C);
    166   // Test InsertAtEnd ICmpInst constructor.
    167   ICmpInst *ICmp2 = new ICmpInst(*BB0, ICmpInst::ICMP_SGE, PtrVecA, PtrVecB);
    168   EXPECT_NE(ICmp0, ICmp2); // suppress warning.
    169 
    170   GetElementPtrInst *Gep0 = GetElementPtrInst::Create(PtrVecA, C2xi32a);
    171   GetElementPtrInst *Gep1 = GetElementPtrInst::Create(PtrVecA, C2xi32b);
    172   GetElementPtrInst *Gep2 = GetElementPtrInst::Create(PtrVecB, C2xi32a);
    173   GetElementPtrInst *Gep3 = GetElementPtrInst::Create(PtrVecB, C2xi32b);
    174 
    175   CastInst *BTC0 = new BitCastInst(Gep0, V2xi8PTy);
    176   CastInst *BTC1 = new BitCastInst(Gep1, V2xi8PTy);
    177   CastInst *BTC2 = new BitCastInst(Gep2, V2xi8PTy);
    178   CastInst *BTC3 = new BitCastInst(Gep3, V2xi8PTy);
    179 
    180   Value *S0 = BTC0->stripPointerCasts();
    181   Value *S1 = BTC1->stripPointerCasts();
    182   Value *S2 = BTC2->stripPointerCasts();
    183   Value *S3 = BTC3->stripPointerCasts();
    184 
    185   EXPECT_NE(S0, Gep0);
    186   EXPECT_NE(S1, Gep1);
    187   EXPECT_NE(S2, Gep2);
    188   EXPECT_NE(S3, Gep3);
    189 
    190   int64_t Offset;
    191   DataLayout TD("e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f3"
    192                 "2:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80"
    193                 ":128:128-n8:16:32:64-S128");
    194   // Make sure we don't crash
    195   GetPointerBaseWithConstantOffset(Gep0, Offset, &TD);
    196   GetPointerBaseWithConstantOffset(Gep1, Offset, &TD);
    197   GetPointerBaseWithConstantOffset(Gep2, Offset, &TD);
    198   GetPointerBaseWithConstantOffset(Gep3, Offset, &TD);
    199 
    200   // Gep of Geps
    201   GetElementPtrInst *GepII0 = GetElementPtrInst::Create(Gep0, C2xi32b);
    202   GetElementPtrInst *GepII1 = GetElementPtrInst::Create(Gep1, C2xi32a);
    203   GetElementPtrInst *GepII2 = GetElementPtrInst::Create(Gep2, C2xi32b);
    204   GetElementPtrInst *GepII3 = GetElementPtrInst::Create(Gep3, C2xi32a);
    205 
    206   EXPECT_EQ(GepII0->getNumIndices(), 1u);
    207   EXPECT_EQ(GepII1->getNumIndices(), 1u);
    208   EXPECT_EQ(GepII2->getNumIndices(), 1u);
    209   EXPECT_EQ(GepII3->getNumIndices(), 1u);
    210 
    211   EXPECT_FALSE(GepII0->hasAllZeroIndices());
    212   EXPECT_FALSE(GepII1->hasAllZeroIndices());
    213   EXPECT_FALSE(GepII2->hasAllZeroIndices());
    214   EXPECT_FALSE(GepII3->hasAllZeroIndices());
    215 
    216   delete GepII0;
    217   delete GepII1;
    218   delete GepII2;
    219   delete GepII3;
    220 
    221   delete BTC0;
    222   delete BTC1;
    223   delete BTC2;
    224   delete BTC3;
    225 
    226   delete Gep0;
    227   delete Gep1;
    228   delete Gep2;
    229   delete Gep3;
    230 
    231   ICmp2->eraseFromParent();
    232   delete BB0;
    233 
    234   delete ICmp0;
    235   delete ICmp1;
    236   delete PtrVecA;
    237   delete PtrVecB;
    238 }
    239 
    240 TEST(InstructionsTest, FPMathOperator) {
    241   LLVMContext &Context = getGlobalContext();
    242   IRBuilder<> Builder(Context);
    243   MDBuilder MDHelper(Context);
    244   Instruction *I = Builder.CreatePHI(Builder.getDoubleTy(), 0);
    245   MDNode *MD1 = MDHelper.createFPMath(1.0);
    246   Value *V1 = Builder.CreateFAdd(I, I, "", MD1);
    247   EXPECT_TRUE(isa<FPMathOperator>(V1));
    248   FPMathOperator *O1 = cast<FPMathOperator>(V1);
    249   EXPECT_EQ(O1->getFPAccuracy(), 1.0);
    250   delete V1;
    251   delete I;
    252 }
    253 
    254 
    255 TEST(InstructionsTest, isEliminableCastPair) {
    256   LLVMContext &C(getGlobalContext());
    257 
    258   Type* Int32Ty = Type::getInt32Ty(C);
    259   Type* Int64Ty = Type::getInt64Ty(C);
    260   Type* Int64PtrTy = Type::getInt64PtrTy(C);
    261 
    262   // Source and destination pointers have same size -> bitcast.
    263   EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::PtrToInt,
    264                                            CastInst::IntToPtr,
    265                                            Int64PtrTy, Int64Ty, Int64PtrTy,
    266                                            Int32Ty, 0, Int32Ty),
    267             CastInst::BitCast);
    268 
    269   // Source and destination pointers have different sizes -> fail.
    270   EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::PtrToInt,
    271                                            CastInst::IntToPtr,
    272                                            Int64PtrTy, Int64Ty, Int64PtrTy,
    273                                            Int32Ty, 0, Int64Ty),
    274             0U);
    275 
    276   // Middle pointer big enough -> bitcast.
    277   EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::IntToPtr,
    278                                            CastInst::PtrToInt,
    279                                            Int64Ty, Int64PtrTy, Int64Ty,
    280                                            0, Int64Ty, 0),
    281             CastInst::BitCast);
    282 
    283   // Middle pointer too small -> fail.
    284   EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::IntToPtr,
    285                                            CastInst::PtrToInt,
    286                                            Int64Ty, Int64PtrTy, Int64Ty,
    287                                            0, Int32Ty, 0),
    288             0U);
    289 }
    290 
    291 }  // end anonymous namespace
    292 }  // end namespace llvm
    293