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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
215 lines
7.7 KiB
C++
215 lines
7.7 KiB
C++
//===- ProfileSummaryInfoTest.cpp - ProfileSummaryInfo 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/ProfileSummaryInfo.h"
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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/CallSite.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/MDBuilder.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/FormatVariadic.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 ProfileSummaryInfoTest : public testing::Test {
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protected:
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LLVMContext C;
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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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ProfileSummaryInfo buildPSI(Module *M) {
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return ProfileSummaryInfo(*M);
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}
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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(const char *ProfKind = nullptr) {
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const char *ModuleString =
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"define i32 @g(i32 %x) !prof !21 {{\n"
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" ret i32 0\n"
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"}\n"
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"define i32 @h(i32 %x) !prof !22 {{\n"
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" ret i32 0\n"
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"}\n"
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"define i32 @f(i32 %x) !prof !20 {{\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, !prof !23 \n"
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"bb1:\n"
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" %z1 = call i32 @g(i32 %x)\n"
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" br label %bb3\n"
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"bb2:\n"
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" %z2 = call i32 @h(i32 %x)\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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"!20 = !{{!\"function_entry_count\", i64 400}\n"
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"!21 = !{{!\"function_entry_count\", i64 1}\n"
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"!22 = !{{!\"function_entry_count\", i64 100}\n"
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"!23 = !{{!\"branch_weights\", i32 64, i32 4}\n"
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"{0}";
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const char *SummaryString = "!llvm.module.flags = !{{!1}"
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"!1 = !{{i32 1, !\"ProfileSummary\", !2}"
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"!2 = !{{!3, !4, !5, !6, !7, !8, !9, !10}"
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"!3 = !{{!\"ProfileFormat\", !\"{0}\"}"
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"!4 = !{{!\"TotalCount\", i64 10000}"
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"!5 = !{{!\"MaxCount\", i64 10}"
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"!6 = !{{!\"MaxInternalCount\", i64 1}"
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"!7 = !{{!\"MaxFunctionCount\", i64 1000}"
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"!8 = !{{!\"NumCounts\", i64 3}"
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"!9 = !{{!\"NumFunctions\", i64 3}"
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"!10 = !{{!\"DetailedSummary\", !11}"
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"!11 = !{{!12, !13, !14}"
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"!12 = !{{i32 10000, i64 1000, i32 1}"
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"!13 = !{{i32 999000, i64 300, i32 3}"
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"!14 = !{{i32 999999, i64 5, i32 10}";
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SMDiagnostic Err;
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if (ProfKind)
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return parseAssemblyString(
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formatv(ModuleString, formatv(SummaryString, ProfKind).str()).str(),
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Err, C);
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else
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return parseAssemblyString(formatv(ModuleString, "").str(), Err, C);
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}
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};
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TEST_F(ProfileSummaryInfoTest, TestNoProfile) {
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auto M = makeLLVMModule(/*ProfKind=*/nullptr);
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Function *F = M->getFunction("f");
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ProfileSummaryInfo PSI = buildPSI(M.get());
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EXPECT_FALSE(PSI.hasProfileSummary());
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EXPECT_FALSE(PSI.hasSampleProfile());
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EXPECT_FALSE(PSI.hasInstrumentationProfile());
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// In the absence of profiles, is{Hot|Cold}X methods should always return
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// false.
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EXPECT_FALSE(PSI.isHotCount(1000));
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EXPECT_FALSE(PSI.isHotCount(0));
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EXPECT_FALSE(PSI.isColdCount(1000));
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EXPECT_FALSE(PSI.isColdCount(0));
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EXPECT_FALSE(PSI.isFunctionEntryHot(F));
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EXPECT_FALSE(PSI.isFunctionEntryCold(F));
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BasicBlock &BB0 = F->getEntryBlock();
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BasicBlock *BB1 = BB0.getTerminator()->getSuccessor(0);
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BlockFrequencyInfo BFI = buildBFI(*F);
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EXPECT_FALSE(PSI.isHotBlock(&BB0, &BFI));
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EXPECT_FALSE(PSI.isColdBlock(&BB0, &BFI));
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CallSite CS1(BB1->getFirstNonPHI());
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EXPECT_FALSE(PSI.isHotCallSite(CS1, &BFI));
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EXPECT_FALSE(PSI.isColdCallSite(CS1, &BFI));
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}
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TEST_F(ProfileSummaryInfoTest, TestCommon) {
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auto M = makeLLVMModule("InstrProf");
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Function *F = M->getFunction("f");
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Function *G = M->getFunction("g");
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Function *H = M->getFunction("h");
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ProfileSummaryInfo PSI = buildPSI(M.get());
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EXPECT_TRUE(PSI.hasProfileSummary());
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EXPECT_TRUE(PSI.isHotCount(400));
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EXPECT_TRUE(PSI.isColdCount(2));
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EXPECT_FALSE(PSI.isColdCount(100));
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EXPECT_FALSE(PSI.isHotCount(100));
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EXPECT_TRUE(PSI.isFunctionEntryHot(F));
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EXPECT_FALSE(PSI.isFunctionEntryHot(G));
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EXPECT_FALSE(PSI.isFunctionEntryHot(H));
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}
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TEST_F(ProfileSummaryInfoTest, InstrProf) {
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auto M = makeLLVMModule("InstrProf");
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Function *F = M->getFunction("f");
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ProfileSummaryInfo PSI = buildPSI(M.get());
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EXPECT_TRUE(PSI.hasProfileSummary());
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EXPECT_TRUE(PSI.hasInstrumentationProfile());
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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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BlockFrequencyInfo BFI = buildBFI(*F);
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EXPECT_TRUE(PSI.isHotBlock(&BB0, &BFI));
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EXPECT_TRUE(PSI.isHotBlock(BB1, &BFI));
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EXPECT_FALSE(PSI.isHotBlock(BB2, &BFI));
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EXPECT_TRUE(PSI.isHotBlock(BB3, &BFI));
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CallSite CS1(BB1->getFirstNonPHI());
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auto *CI2 = BB2->getFirstNonPHI();
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CallSite CS2(CI2);
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EXPECT_TRUE(PSI.isHotCallSite(CS1, &BFI));
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EXPECT_FALSE(PSI.isHotCallSite(CS2, &BFI));
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// Test that adding an MD_prof metadata with a hot count on CS2 does not
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// change its hotness as it has no effect in instrumented profiling.
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MDBuilder MDB(M->getContext());
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CI2->setMetadata(llvm::LLVMContext::MD_prof, MDB.createBranchWeights({400}));
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EXPECT_FALSE(PSI.isHotCallSite(CS2, &BFI));
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}
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TEST_F(ProfileSummaryInfoTest, SampleProf) {
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auto M = makeLLVMModule("SampleProfile");
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Function *F = M->getFunction("f");
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ProfileSummaryInfo PSI = buildPSI(M.get());
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EXPECT_TRUE(PSI.hasProfileSummary());
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EXPECT_TRUE(PSI.hasSampleProfile());
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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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BlockFrequencyInfo BFI = buildBFI(*F);
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EXPECT_TRUE(PSI.isHotBlock(&BB0, &BFI));
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EXPECT_TRUE(PSI.isHotBlock(BB1, &BFI));
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EXPECT_FALSE(PSI.isHotBlock(BB2, &BFI));
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EXPECT_TRUE(PSI.isHotBlock(BB3, &BFI));
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CallSite CS1(BB1->getFirstNonPHI());
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auto *CI2 = BB2->getFirstNonPHI();
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// Manually attach branch weights metadata to the call instruction.
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SmallVector<uint32_t, 1> Weights;
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Weights.push_back(1000);
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MDBuilder MDB(M->getContext());
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CI2->setMetadata(LLVMContext::MD_prof, MDB.createBranchWeights(Weights));
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CallSite CS2(CI2);
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EXPECT_FALSE(PSI.isHotCallSite(CS1, &BFI));
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EXPECT_TRUE(PSI.isHotCallSite(CS2, &BFI));
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// Test that CS2 is considered hot when it gets an MD_prof metadata with
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// weights that exceed the hot count threshold.
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CI2->setMetadata(llvm::LLVMContext::MD_prof, MDB.createBranchWeights({400}));
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EXPECT_TRUE(PSI.isHotCallSite(CS2, &BFI));
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}
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} // end anonymous namespace
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} // end namespace llvm
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