mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 20:23:11 +01:00
26000e4af9
Summary: For SamplePGO, we already record the callsite count in the call instruction itself. So we do not want to use BFI to get profile count as it is less accurate. Reviewers: tejohnson, davidxl, eraman Reviewed By: eraman Subscribers: sanjoy, llvm-commits, mehdi_amini Differential Revision: https://reviews.llvm.org/D36025 llvm-svn: 309964
217 lines
7.7 KiB
C++
217 lines
7.7 KiB
C++
//===- ProfileSummaryInfoTest.cpp - ProfileSummaryInfo unit tests ---------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Analysis/ProfileSummaryInfo.h"
|
|
#include "llvm/Analysis/BlockFrequencyInfo.h"
|
|
#include "llvm/Analysis/BlockFrequencyInfoImpl.h"
|
|
#include "llvm/Analysis/BranchProbabilityInfo.h"
|
|
#include "llvm/Analysis/LoopInfo.h"
|
|
#include "llvm/AsmParser/Parser.h"
|
|
#include "llvm/IR/BasicBlock.h"
|
|
#include "llvm/IR/CallSite.h"
|
|
#include "llvm/IR/Dominators.h"
|
|
#include "llvm/IR/Function.h"
|
|
#include "llvm/IR/LLVMContext.h"
|
|
#include "llvm/IR/MDBuilder.h"
|
|
#include "llvm/IR/Module.h"
|
|
#include "llvm/Support/DataTypes.h"
|
|
#include "llvm/Support/FormatVariadic.h"
|
|
#include "llvm/Support/SourceMgr.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include "gtest/gtest.h"
|
|
|
|
namespace llvm {
|
|
namespace {
|
|
|
|
class ProfileSummaryInfoTest : public testing::Test {
|
|
protected:
|
|
LLVMContext C;
|
|
std::unique_ptr<BranchProbabilityInfo> BPI;
|
|
std::unique_ptr<DominatorTree> DT;
|
|
std::unique_ptr<LoopInfo> LI;
|
|
|
|
ProfileSummaryInfo buildPSI(Module *M) {
|
|
return ProfileSummaryInfo(*M);
|
|
}
|
|
BlockFrequencyInfo buildBFI(Function &F) {
|
|
DT.reset(new DominatorTree(F));
|
|
LI.reset(new LoopInfo(*DT));
|
|
BPI.reset(new BranchProbabilityInfo(F, *LI));
|
|
return BlockFrequencyInfo(F, *BPI, *LI);
|
|
}
|
|
std::unique_ptr<Module> makeLLVMModule(const char *ProfKind = nullptr) {
|
|
const char *ModuleString =
|
|
"define i32 @g(i32 %x) !prof !21 {{\n"
|
|
" ret i32 0\n"
|
|
"}\n"
|
|
"define i32 @h(i32 %x) !prof !22 {{\n"
|
|
" ret i32 0\n"
|
|
"}\n"
|
|
"define i32 @f(i32 %x) !prof !20 {{\n"
|
|
"bb0:\n"
|
|
" %y1 = icmp eq i32 %x, 0 \n"
|
|
" br i1 %y1, label %bb1, label %bb2, !prof !23 \n"
|
|
"bb1:\n"
|
|
" %z1 = call i32 @g(i32 %x)\n"
|
|
" br label %bb3\n"
|
|
"bb2:\n"
|
|
" %z2 = call i32 @h(i32 %x)\n"
|
|
" br label %bb3\n"
|
|
"bb3:\n"
|
|
" %y2 = phi i32 [0, %bb1], [1, %bb2] \n"
|
|
" ret i32 %y2\n"
|
|
"}\n"
|
|
"!20 = !{{!\"function_entry_count\", i64 400}\n"
|
|
"!21 = !{{!\"function_entry_count\", i64 1}\n"
|
|
"!22 = !{{!\"function_entry_count\", i64 100}\n"
|
|
"!23 = !{{!\"branch_weights\", i32 64, i32 4}\n"
|
|
"{0}";
|
|
const char *SummaryString = "!llvm.module.flags = !{{!1}"
|
|
"!1 = !{{i32 1, !\"ProfileSummary\", !2}"
|
|
"!2 = !{{!3, !4, !5, !6, !7, !8, !9, !10}"
|
|
"!3 = !{{!\"ProfileFormat\", !\"{0}\"}"
|
|
"!4 = !{{!\"TotalCount\", i64 10000}"
|
|
"!5 = !{{!\"MaxCount\", i64 10}"
|
|
"!6 = !{{!\"MaxInternalCount\", i64 1}"
|
|
"!7 = !{{!\"MaxFunctionCount\", i64 1000}"
|
|
"!8 = !{{!\"NumCounts\", i64 3}"
|
|
"!9 = !{{!\"NumFunctions\", i64 3}"
|
|
"!10 = !{{!\"DetailedSummary\", !11}"
|
|
"!11 = !{{!12, !13, !14}"
|
|
"!12 = !{{i32 10000, i64 1000, i32 1}"
|
|
"!13 = !{{i32 999000, i64 300, i32 3}"
|
|
"!14 = !{{i32 999999, i64 5, i32 10}";
|
|
SMDiagnostic Err;
|
|
if (ProfKind)
|
|
return parseAssemblyString(
|
|
formatv(ModuleString, formatv(SummaryString, ProfKind).str()).str(),
|
|
Err, C);
|
|
else
|
|
return parseAssemblyString(formatv(ModuleString, "").str(), Err, C);
|
|
}
|
|
};
|
|
|
|
TEST_F(ProfileSummaryInfoTest, TestNoProfile) {
|
|
auto M = makeLLVMModule(/*ProfKind=*/nullptr);
|
|
Function *F = M->getFunction("f");
|
|
|
|
ProfileSummaryInfo PSI = buildPSI(M.get());
|
|
EXPECT_FALSE(PSI.hasProfileSummary());
|
|
EXPECT_FALSE(PSI.hasSampleProfile());
|
|
EXPECT_FALSE(PSI.hasInstrumentationProfile());
|
|
// In the absence of profiles, is{Hot|Cold}X methods should always return
|
|
// false.
|
|
EXPECT_FALSE(PSI.isHotCount(1000));
|
|
EXPECT_FALSE(PSI.isHotCount(0));
|
|
EXPECT_FALSE(PSI.isColdCount(1000));
|
|
EXPECT_FALSE(PSI.isColdCount(0));
|
|
|
|
EXPECT_FALSE(PSI.isFunctionEntryHot(F));
|
|
EXPECT_FALSE(PSI.isFunctionEntryCold(F));
|
|
|
|
BasicBlock &BB0 = F->getEntryBlock();
|
|
BasicBlock *BB1 = BB0.getTerminator()->getSuccessor(0);
|
|
|
|
BlockFrequencyInfo BFI = buildBFI(*F);
|
|
EXPECT_FALSE(PSI.isHotBB(&BB0, &BFI));
|
|
EXPECT_FALSE(PSI.isColdBB(&BB0, &BFI));
|
|
|
|
CallSite CS1(BB1->getFirstNonPHI());
|
|
EXPECT_FALSE(PSI.isHotCallSite(CS1, &BFI));
|
|
EXPECT_FALSE(PSI.isColdCallSite(CS1, &BFI));
|
|
}
|
|
TEST_F(ProfileSummaryInfoTest, TestCommon) {
|
|
auto M = makeLLVMModule("InstrProf");
|
|
Function *F = M->getFunction("f");
|
|
Function *G = M->getFunction("g");
|
|
Function *H = M->getFunction("h");
|
|
|
|
ProfileSummaryInfo PSI = buildPSI(M.get());
|
|
EXPECT_TRUE(PSI.hasProfileSummary());
|
|
EXPECT_TRUE(PSI.isHotCount(400));
|
|
EXPECT_TRUE(PSI.isColdCount(2));
|
|
EXPECT_FALSE(PSI.isColdCount(100));
|
|
EXPECT_FALSE(PSI.isHotCount(100));
|
|
|
|
EXPECT_TRUE(PSI.isFunctionEntryHot(F));
|
|
EXPECT_FALSE(PSI.isFunctionEntryHot(G));
|
|
EXPECT_FALSE(PSI.isFunctionEntryHot(H));
|
|
}
|
|
|
|
TEST_F(ProfileSummaryInfoTest, InstrProf) {
|
|
auto M = makeLLVMModule("InstrProf");
|
|
Function *F = M->getFunction("f");
|
|
ProfileSummaryInfo PSI = buildPSI(M.get());
|
|
EXPECT_TRUE(PSI.hasProfileSummary());
|
|
EXPECT_TRUE(PSI.hasInstrumentationProfile());
|
|
|
|
BasicBlock &BB0 = F->getEntryBlock();
|
|
BasicBlock *BB1 = BB0.getTerminator()->getSuccessor(0);
|
|
BasicBlock *BB2 = BB0.getTerminator()->getSuccessor(1);
|
|
BasicBlock *BB3 = BB1->getSingleSuccessor();
|
|
|
|
BlockFrequencyInfo BFI = buildBFI(*F);
|
|
EXPECT_TRUE(PSI.isHotBB(&BB0, &BFI));
|
|
EXPECT_TRUE(PSI.isHotBB(BB1, &BFI));
|
|
EXPECT_FALSE(PSI.isHotBB(BB2, &BFI));
|
|
EXPECT_TRUE(PSI.isHotBB(BB3, &BFI));
|
|
|
|
CallSite CS1(BB1->getFirstNonPHI());
|
|
auto *CI2 = BB2->getFirstNonPHI();
|
|
CallSite CS2(CI2);
|
|
|
|
EXPECT_TRUE(PSI.isHotCallSite(CS1, &BFI));
|
|
EXPECT_FALSE(PSI.isHotCallSite(CS2, &BFI));
|
|
|
|
// Test that adding an MD_prof metadata with a hot count on CS2 does not
|
|
// change its hotness as it has no effect in instrumented profiling.
|
|
MDBuilder MDB(M->getContext());
|
|
CI2->setMetadata(llvm::LLVMContext::MD_prof, MDB.createBranchWeights({400}));
|
|
EXPECT_FALSE(PSI.isHotCallSite(CS2, &BFI));
|
|
}
|
|
|
|
TEST_F(ProfileSummaryInfoTest, SampleProf) {
|
|
auto M = makeLLVMModule("SampleProfile");
|
|
Function *F = M->getFunction("f");
|
|
ProfileSummaryInfo PSI = buildPSI(M.get());
|
|
EXPECT_TRUE(PSI.hasProfileSummary());
|
|
EXPECT_TRUE(PSI.hasSampleProfile());
|
|
|
|
BasicBlock &BB0 = F->getEntryBlock();
|
|
BasicBlock *BB1 = BB0.getTerminator()->getSuccessor(0);
|
|
BasicBlock *BB2 = BB0.getTerminator()->getSuccessor(1);
|
|
BasicBlock *BB3 = BB1->getSingleSuccessor();
|
|
|
|
BlockFrequencyInfo BFI = buildBFI(*F);
|
|
EXPECT_TRUE(PSI.isHotBB(&BB0, &BFI));
|
|
EXPECT_TRUE(PSI.isHotBB(BB1, &BFI));
|
|
EXPECT_FALSE(PSI.isHotBB(BB2, &BFI));
|
|
EXPECT_TRUE(PSI.isHotBB(BB3, &BFI));
|
|
|
|
CallSite CS1(BB1->getFirstNonPHI());
|
|
auto *CI2 = BB2->getFirstNonPHI();
|
|
// Manually attach branch weights metadata to the call instruction.
|
|
SmallVector<uint32_t, 1> Weights;
|
|
Weights.push_back(1000);
|
|
MDBuilder MDB(M->getContext());
|
|
CI2->setMetadata(LLVMContext::MD_prof, MDB.createBranchWeights(Weights));
|
|
CallSite CS2(CI2);
|
|
|
|
EXPECT_FALSE(PSI.isHotCallSite(CS1, &BFI));
|
|
EXPECT_TRUE(PSI.isHotCallSite(CS2, &BFI));
|
|
|
|
// Test that CS2 is considered hot when it gets an MD_prof metadata with
|
|
// weights that exceed the hot count threshold.
|
|
CI2->setMetadata(llvm::LLVMContext::MD_prof, MDB.createBranchWeights({400}));
|
|
EXPECT_TRUE(PSI.isHotCallSite(CS2, &BFI));
|
|
}
|
|
|
|
} // end anonymous namespace
|
|
} // end namespace llvm
|