1 //===- BlockFrequencyInfoTest.cpp - BlockFrequencyInfo 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/Analysis/BlockFrequencyInfo.h" 11 #include "llvm/Analysis/BlockFrequencyInfoImpl.h" 12 #include "llvm/Analysis/BranchProbabilityInfo.h" 13 #include "llvm/Analysis/LoopInfo.h" 14 #include "llvm/AsmParser/Parser.h" 15 #include "llvm/IR/BasicBlock.h" 16 #include "llvm/IR/Dominators.h" 17 #include "llvm/IR/Function.h" 18 #include "llvm/IR/LLVMContext.h" 19 #include "llvm/IR/Module.h" 20 #include "llvm/Support/DataTypes.h" 21 #include "llvm/Support/SourceMgr.h" 22 #include "llvm/Support/raw_ostream.h" 23 #include "gtest/gtest.h" 24 25 namespace llvm { 26 namespace { 27 28 class BlockFrequencyInfoTest : public testing::Test { 29 protected: 30 std::unique_ptr<BranchProbabilityInfo> BPI; 31 std::unique_ptr<DominatorTree> DT; 32 std::unique_ptr<LoopInfo> LI; 33 34 BlockFrequencyInfo buildBFI(Function &F) { 35 DT.reset(new DominatorTree(F)); 36 LI.reset(new LoopInfo(*DT)); 37 BPI.reset(new BranchProbabilityInfo(F, *LI)); 38 return BlockFrequencyInfo(F, *BPI, *LI); 39 } 40 std::unique_ptr<Module> makeLLVMModule() { 41 const char *ModuleStrig = "define i32 @f(i32 %x) {\n" 42 "bb0:\n" 43 " %y1 = icmp eq i32 %x, 0 \n" 44 " br i1 %y1, label %bb1, label %bb2 \n" 45 "bb1:\n" 46 " br label %bb3\n" 47 "bb2:\n" 48 " br label %bb3\n" 49 "bb3:\n" 50 " %y2 = phi i32 [0, %bb1], [1, %bb2] \n" 51 " ret i32 %y2\n" 52 "}\n"; 53 LLVMContext &C = getGlobalContext(); 54 SMDiagnostic Err; 55 return parseAssemblyString(ModuleStrig, Err, C); 56 } 57 }; 58 59 TEST_F(BlockFrequencyInfoTest, Basic) { 60 auto M = makeLLVMModule(); 61 Function *F = M->getFunction("f"); 62 F->setEntryCount(100); 63 64 BlockFrequencyInfo BFI = buildBFI(*F); 65 BasicBlock &BB0 = F->getEntryBlock(); 66 BasicBlock *BB1 = BB0.getTerminator()->getSuccessor(0); 67 BasicBlock *BB2 = BB0.getTerminator()->getSuccessor(1); 68 BasicBlock *BB3 = BB1->getSingleSuccessor(); 69 70 uint64_t BB0Freq = BFI.getBlockFreq(&BB0).getFrequency(); 71 uint64_t BB1Freq = BFI.getBlockFreq(BB1).getFrequency(); 72 uint64_t BB2Freq = BFI.getBlockFreq(BB2).getFrequency(); 73 uint64_t BB3Freq = BFI.getBlockFreq(BB3).getFrequency(); 74 75 EXPECT_EQ(BB0Freq, BB3Freq); 76 EXPECT_EQ(BB0Freq, BB1Freq + BB2Freq); 77 EXPECT_EQ(BB0Freq, BB3Freq); 78 79 EXPECT_EQ(BFI.getBlockProfileCount(&BB0).getValue(), UINT64_C(100)); 80 EXPECT_EQ(BFI.getBlockProfileCount(BB3).getValue(), UINT64_C(100)); 81 EXPECT_EQ(BFI.getBlockProfileCount(BB1).getValue(), 100 * BB1Freq / BB0Freq); 82 EXPECT_EQ(BFI.getBlockProfileCount(BB2).getValue(), 100 * BB2Freq / BB0Freq); 83 } 84 85 } // end anonymous namespace 86 } // end namespace llvm 87