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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
95 lines
3.5 KiB
C++
95 lines
3.5 KiB
C++
//===- BlockFrequencyInfoTest.cpp - BlockFrequencyInfo unit tests ---------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/BlockFrequencyInfo.h"
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#include "llvm/Analysis/BranchProbabilityInfo.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/AsmParser/Parser.h"
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#include "llvm/IR/BasicBlock.h"
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#include "llvm/IR/Dominators.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/raw_ostream.h"
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#include "gtest/gtest.h"
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namespace llvm {
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namespace {
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class BlockFrequencyInfoTest : public testing::Test {
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protected:
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std::unique_ptr<BranchProbabilityInfo> BPI;
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std::unique_ptr<DominatorTree> DT;
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std::unique_ptr<LoopInfo> LI;
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LLVMContext C;
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BlockFrequencyInfo buildBFI(Function &F) {
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DT.reset(new DominatorTree(F));
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LI.reset(new LoopInfo(*DT));
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BPI.reset(new BranchProbabilityInfo(F, *LI));
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return BlockFrequencyInfo(F, *BPI, *LI);
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}
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std::unique_ptr<Module> makeLLVMModule() {
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const char *ModuleStrig = "define i32 @f(i32 %x) {\n"
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"bb0:\n"
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" %y1 = icmp eq i32 %x, 0 \n"
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" br i1 %y1, label %bb1, label %bb2 \n"
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"bb1:\n"
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" br label %bb3\n"
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"bb2:\n"
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" br label %bb3\n"
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"bb3:\n"
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" %y2 = phi i32 [0, %bb1], [1, %bb2] \n"
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" ret i32 %y2\n"
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"}\n";
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SMDiagnostic Err;
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return parseAssemblyString(ModuleStrig, Err, C);
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}
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};
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TEST_F(BlockFrequencyInfoTest, Basic) {
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auto M = makeLLVMModule();
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Function *F = M->getFunction("f");
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F->setEntryCount(100);
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BlockFrequencyInfo BFI = buildBFI(*F);
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BasicBlock &BB0 = F->getEntryBlock();
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BasicBlock *BB1 = BB0.getTerminator()->getSuccessor(0);
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BasicBlock *BB2 = BB0.getTerminator()->getSuccessor(1);
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BasicBlock *BB3 = BB1->getSingleSuccessor();
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uint64_t BB0Freq = BFI.getBlockFreq(&BB0).getFrequency();
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uint64_t BB1Freq = BFI.getBlockFreq(BB1).getFrequency();
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uint64_t BB2Freq = BFI.getBlockFreq(BB2).getFrequency();
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uint64_t BB3Freq = BFI.getBlockFreq(BB3).getFrequency();
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EXPECT_EQ(BB0Freq, BB3Freq);
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EXPECT_EQ(BB0Freq, BB1Freq + BB2Freq);
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EXPECT_EQ(BB0Freq, BB3Freq);
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EXPECT_EQ(BFI.getBlockProfileCount(&BB0).getValue(), UINT64_C(100));
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EXPECT_EQ(BFI.getBlockProfileCount(BB3).getValue(), UINT64_C(100));
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EXPECT_EQ(BFI.getBlockProfileCount(BB1).getValue(),
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(100 * BB1Freq + BB0Freq / 2) / BB0Freq);
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EXPECT_EQ(BFI.getBlockProfileCount(BB2).getValue(),
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(100 * BB2Freq + BB0Freq / 2) / BB0Freq);
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// Scale the frequencies of BB0, BB1 and BB2 by a factor of two.
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SmallPtrSet<BasicBlock *, 4> BlocksToScale({BB1, BB2});
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BFI.setBlockFreqAndScale(&BB0, BB0Freq * 2, BlocksToScale);
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EXPECT_EQ(BFI.getBlockFreq(&BB0).getFrequency(), 2 * BB0Freq);
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EXPECT_EQ(BFI.getBlockFreq(BB1).getFrequency(), 2 * BB1Freq);
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EXPECT_EQ(BFI.getBlockFreq(BB2).getFrequency(), 2 * BB2Freq);
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EXPECT_EQ(BFI.getBlockFreq(BB3).getFrequency(), BB3Freq);
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}
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} // end anonymous namespace
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} // end namespace llvm
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