mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-12-09 04:24:10 +00:00
87b8e94f84
clang-format (https://reviews.llvm.org/D33932) to keep primary headers at the top and handle new utility headers like 'gmock' consistently with other utility headers. No other change was made. I did no manual edits, all of this is clang-format. This should allow other changes to have more clear and focused diffs, and is especially motivated by moving some headers into more focused libraries. llvm-svn: 304786
89 lines
2.7 KiB
C++
89 lines
2.7 KiB
C++
//===- BranchProbabilityInfoTest.cpp - BranchProbabilityInfo 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/BranchProbabilityInfo.h"
|
|
#include "llvm/Analysis/LoopInfo.h"
|
|
#include "llvm/AsmParser/Parser.h"
|
|
#include "llvm/IR/BasicBlock.h"
|
|
#include "llvm/IR/Constants.h"
|
|
#include "llvm/IR/Dominators.h"
|
|
#include "llvm/IR/Function.h"
|
|
#include "llvm/IR/Instructions.h"
|
|
#include "llvm/IR/LLVMContext.h"
|
|
#include "llvm/IR/Module.h"
|
|
#include "llvm/Support/DataTypes.h"
|
|
#include "llvm/Support/SourceMgr.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include "gtest/gtest.h"
|
|
|
|
namespace llvm {
|
|
namespace {
|
|
|
|
struct BranchProbabilityInfoTest : public testing::Test {
|
|
std::unique_ptr<BranchProbabilityInfo> BPI;
|
|
std::unique_ptr<DominatorTree> DT;
|
|
std::unique_ptr<LoopInfo> LI;
|
|
LLVMContext C;
|
|
|
|
BranchProbabilityInfo &buildBPI(Function &F) {
|
|
DT.reset(new DominatorTree(F));
|
|
LI.reset(new LoopInfo(*DT));
|
|
BPI.reset(new BranchProbabilityInfo(F, *LI));
|
|
return *BPI;
|
|
}
|
|
|
|
std::unique_ptr<Module> makeLLVMModule() {
|
|
const char *ModuleString = "define void @f() { exit: ret void }\n";
|
|
SMDiagnostic Err;
|
|
return parseAssemblyString(ModuleString, Err, C);
|
|
}
|
|
};
|
|
|
|
TEST_F(BranchProbabilityInfoTest, StressUnreachableHeuristic) {
|
|
auto M = makeLLVMModule();
|
|
Function *F = M->getFunction("f");
|
|
|
|
// define void @f() {
|
|
// entry:
|
|
// switch i32 undef, label %exit, [
|
|
// i32 0, label %preexit
|
|
// ... ;;< Add lots of cases to stress the heuristic.
|
|
// ]
|
|
// preexit:
|
|
// unreachable
|
|
// exit:
|
|
// ret void
|
|
// }
|
|
|
|
auto *ExitBB = &F->back();
|
|
auto *EntryBB = BasicBlock::Create(C, "entry", F, /*insertBefore=*/ExitBB);
|
|
|
|
auto *PreExitBB =
|
|
BasicBlock::Create(C, "preexit", F, /*insertBefore=*/ExitBB);
|
|
new UnreachableInst(C, PreExitBB);
|
|
|
|
unsigned NumCases = 4096;
|
|
auto *I32 = IntegerType::get(C, 32);
|
|
auto *Undef = UndefValue::get(I32);
|
|
auto *Switch = SwitchInst::Create(Undef, ExitBB, NumCases, EntryBB);
|
|
for (unsigned I = 0; I < NumCases; ++I)
|
|
Switch->addCase(ConstantInt::get(I32, I), PreExitBB);
|
|
|
|
BranchProbabilityInfo &BPI = buildBPI(*F);
|
|
|
|
// FIXME: This doesn't seem optimal. Since all of the cases handled by the
|
|
// switch have the *same* destination block ("preexit"), shouldn't it be the
|
|
// hot one? I'd expect the results to be reversed here...
|
|
EXPECT_FALSE(BPI.isEdgeHot(EntryBB, PreExitBB));
|
|
EXPECT_TRUE(BPI.isEdgeHot(EntryBB, ExitBB));
|
|
}
|
|
|
|
} // end anonymous namespace
|
|
} // end namespace llvm
|