[PGO] Memory intrinsic calls optimization based on profiled size
This patch optimizes two memory intrinsic operations: memset and memcpy based
on the profiled size of the operation. The high level transformation is like:
mem_op(..., size)
==>
switch (size) {
case s1:
mem_op(..., s1);
goto merge_bb;
case s2:
mem_op(..., s2);
goto merge_bb;
...
default:
mem_op(..., size);
goto merge_bb;
}
merge_bb:
Differential Revision: http://reviews.llvm.org/D28966
llvm-svn: 299446
diff --git a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
index b933609..6e1edbb 100644
--- a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -302,6 +302,10 @@
MPM.add(createLibCallsShrinkWrapPass());
addExtensionsToPM(EP_Peephole, MPM);
+ // Optimize memory intrinsic calls based on the profiled size information.
+ if (SizeLevel == 0)
+ MPM.add(createPGOMemOPSizeOptLegacyPass());
+
MPM.add(createTailCallEliminationPass()); // Eliminate tail calls
MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
MPM.add(createReassociatePass()); // Reassociate expressions
diff --git a/llvm/lib/Transforms/Instrumentation/IndirectCallPromotion.cpp b/llvm/lib/Transforms/Instrumentation/IndirectCallPromotion.cpp
index 700ed4e..3dfafee 100644
--- a/llvm/lib/Transforms/Instrumentation/IndirectCallPromotion.cpp
+++ b/llvm/lib/Transforms/Instrumentation/IndirectCallPromotion.cpp
@@ -1,4 +1,4 @@
-//===-- IndirectCallPromotion.cpp - Promote indirect calls to direct calls ===//
+//===-- IndirectCallPromotion.cpp - Optimizations based on value profiling ===//
//
// The LLVM Compiler Infrastructure
//
@@ -17,6 +17,7 @@
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
+#include "llvm/Analysis/BlockFrequencyInfo.h"
#include "llvm/Analysis/IndirectCallPromotionAnalysis.h"
#include "llvm/Analysis/IndirectCallSiteVisitor.h"
#include "llvm/IR/BasicBlock.h"
@@ -40,6 +41,7 @@
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/MathExtras.h"
#include "llvm/Transforms/Instrumentation.h"
#include "llvm/Transforms/PGOInstrumentation.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
@@ -53,6 +55,8 @@
STATISTIC(NumOfPGOICallPromotion, "Number of indirect call promotions.");
STATISTIC(NumOfPGOICallsites, "Number of indirect call candidate sites.");
+STATISTIC(NumOfPGOMemOPOpt, "Number of memop intrinsics optimized.");
+STATISTIC(NumOfPGOMemOPAnnotate, "Number of memop intrinsics annotated.");
// Command line option to disable indirect-call promotion with the default as
// false. This is for debug purpose.
@@ -106,6 +110,44 @@
ICPDUMPAFTER("icp-dumpafter", cl::init(false), cl::Hidden,
cl::desc("Dump IR after transformation happens"));
+// The minimum call count to optimize memory intrinsic calls.
+static cl::opt<unsigned>
+ MemOPCountThreshold("pgo-memop-count-threshold", cl::Hidden, cl::ZeroOrMore,
+ cl::init(1000),
+ cl::desc("The minimum count to optimize memory "
+ "intrinsic calls"));
+
+// Command line option to disable memory intrinsic optimization. The default is
+// false. This is for debug purpose.
+static cl::opt<bool> DisableMemOPOPT("disable-memop-opt", cl::init(false),
+ cl::Hidden, cl::desc("Disable optimize"));
+
+// The percent threshold to optimize memory intrinsic calls.
+static cl::opt<unsigned>
+ MemOPPercentThreshold("pgo-memop-percent-threshold", cl::init(40),
+ cl::Hidden, cl::ZeroOrMore,
+ cl::desc("The percentage threshold for the "
+ "memory intrinsic calls optimization"));
+
+// Maximum number of versions for optimizing memory intrinsic call.
+static cl::opt<unsigned>
+ MemOPMaxVersion("pgo-memop-max-version", cl::init(3), cl::Hidden,
+ cl::ZeroOrMore,
+ cl::desc("The max version for the optimized memory "
+ " intrinsic calls"));
+
+// Scale the counts from the annotation using the BB count value.
+static cl::opt<bool>
+ MemOPScaleCount("pgo-memop-scale-count", cl::init(true), cl::Hidden,
+ cl::desc("Scale the memop size counts using the basic "
+ " block count value"));
+
+// This option sets the rangge of precise profile memop sizes.
+extern cl::opt<std::string> MemOPSizeRange;
+
+// This option sets the value that groups large memop sizes
+extern cl::opt<unsigned> MemOPSizeLarge;
+
namespace {
class PGOIndirectCallPromotionLegacyPass : public ModulePass {
public:
@@ -130,6 +172,23 @@
// the promoted direct call.
bool SamplePGO;
};
+
+class PGOMemOPSizeOptLegacyPass : public FunctionPass {
+public:
+ static char ID;
+
+ PGOMemOPSizeOptLegacyPass() : FunctionPass(ID) {
+ initializePGOMemOPSizeOptLegacyPassPass(*PassRegistry::getPassRegistry());
+ }
+
+ StringRef getPassName() const override { return "PGOMemOPSize"; }
+
+private:
+ bool runOnFunction(Function &F) override;
+ void getAnalysisUsage(AnalysisUsage &AU) const override {
+ AU.addRequired<BlockFrequencyInfoWrapperPass>();
+ }
+};
} // end anonymous namespace
char PGOIndirectCallPromotionLegacyPass::ID = 0;
@@ -143,6 +202,19 @@
return new PGOIndirectCallPromotionLegacyPass(InLTO, SamplePGO);
}
+char PGOMemOPSizeOptLegacyPass::ID = 0;
+INITIALIZE_PASS_BEGIN(PGOMemOPSizeOptLegacyPass, "pgo-memop-opt",
+ "Optimize memory intrinsic using its size value profile",
+ false, false)
+INITIALIZE_PASS_DEPENDENCY(BlockFrequencyInfoWrapperPass)
+INITIALIZE_PASS_END(PGOMemOPSizeOptLegacyPass, "pgo-memop-opt",
+ "Optimize memory intrinsic using its size value profile",
+ false, false)
+
+FunctionPass *llvm::createPGOMemOPSizeOptLegacyPass() {
+ return new PGOMemOPSizeOptLegacyPass();
+}
+
namespace {
// The class for main data structure to promote indirect calls to conditional
// direct calls.
@@ -675,3 +747,275 @@
return PreservedAnalyses::none();
}
+
+namespace {
+class MemOPSizeOpt : public InstVisitor<MemOPSizeOpt> {
+public:
+ MemOPSizeOpt(Function &Func, BlockFrequencyInfo &BFI)
+ : Func(Func), BFI(BFI), Changed(false) {
+ ValueDataArray =
+ llvm::make_unique<InstrProfValueData[]>(MemOPMaxVersion + 2);
+ // Get the MemOPSize range information from option MemOPSizeRange,
+ getMemOPSizeRangeFromOption(MemOPSizeRange, PreciseRangeStart,
+ PreciseRangeLast);
+ }
+ bool isChanged() const { return Changed; }
+ void perform() {
+ WorkList.clear();
+ visit(Func);
+
+ for (auto &MI : WorkList) {
+ ++NumOfPGOMemOPAnnotate;
+ if (perform(MI)) {
+ Changed = true;
+ ++NumOfPGOMemOPOpt;
+ DEBUG(dbgs() << "MemOP calls: " << MI->getCalledFunction()->getName()
+ << "is Transformed.\n");
+ }
+ }
+ }
+
+ void visitMemIntrinsic(MemIntrinsic &MI) {
+ Value *Length = MI.getLength();
+ // Not perform on constant length calls.
+ if (dyn_cast<ConstantInt>(Length))
+ return;
+ WorkList.push_back(&MI);
+ }
+
+private:
+ Function &Func;
+ BlockFrequencyInfo &BFI;
+ bool Changed;
+ std::vector<MemIntrinsic *> WorkList;
+ // Start of the previse range.
+ int64_t PreciseRangeStart;
+ // Last value of the previse range.
+ int64_t PreciseRangeLast;
+ // The space to read the profile annotation.
+ std::unique_ptr<InstrProfValueData[]> ValueDataArray;
+ bool perform(MemIntrinsic *MI);
+
+ // This kind shows which group the value falls in. For PreciseValue, we have
+ // the profile count for that value. LargeGroup groups the values that are in
+ // range [LargeValue, +inf). NonLargeGroup groups the rest of values.
+ enum MemOPSizeKind { PreciseValue, NonLargeGroup, LargeGroup };
+
+ MemOPSizeKind getMemOPSizeKind(int64_t Value) const {
+ if (Value == MemOPSizeLarge && MemOPSizeLarge != 0)
+ return LargeGroup;
+ if (Value == PreciseRangeLast + 1)
+ return NonLargeGroup;
+ return PreciseValue;
+ }
+};
+
+static const char *getMIName(const MemIntrinsic *MI) {
+ switch (MI->getIntrinsicID()) {
+ case Intrinsic::memcpy:
+ return "memcpy";
+ case Intrinsic::memmove:
+ return "memmove";
+ case Intrinsic::memset:
+ return "memset";
+ default:
+ return "unknown";
+ }
+}
+
+static bool isProfitable(uint64_t Count, uint64_t TotalCount) {
+ assert(Count <= TotalCount);
+ if (Count < MemOPCountThreshold)
+ return false;
+ if (Count < TotalCount * MemOPPercentThreshold / 100)
+ return false;
+ return true;
+}
+
+static inline uint64_t getScaledCount(uint64_t Count, uint64_t Num,
+ uint64_t Denom) {
+ if (!MemOPScaleCount)
+ return Count;
+ bool Overflowed;
+ uint64_t ScaleCount = SaturatingMultiply(Count, Num, &Overflowed);
+ return ScaleCount / Denom;
+}
+
+bool MemOPSizeOpt::perform(MemIntrinsic *MI) {
+ assert(MI);
+ if (MI->getIntrinsicID() == Intrinsic::memmove)
+ return false;
+
+ uint32_t NumVals, MaxNumPromotions = MemOPMaxVersion + 2;
+ uint64_t TotalCount;
+ if (!getValueProfDataFromInst(*MI, IPVK_MemOPSize, MaxNumPromotions,
+ ValueDataArray.get(), NumVals, TotalCount))
+ return false;
+
+ uint64_t ActualCount = TotalCount;
+ uint64_t SavedTotalCount = TotalCount;
+ if (MemOPScaleCount) {
+ auto BBEdgeCount = BFI.getBlockProfileCount(MI->getParent());
+ if (!BBEdgeCount)
+ return false;
+ ActualCount = *BBEdgeCount;
+ }
+
+ if (ActualCount < MemOPCountThreshold)
+ return false;
+
+ ArrayRef<InstrProfValueData> VDs(ValueDataArray.get(), NumVals);
+ TotalCount = ActualCount;
+ if (MemOPScaleCount)
+ DEBUG(dbgs() << "Scale counts: numberator = " << ActualCount
+ << " denominator = " << SavedTotalCount << "\n");
+
+ // Keeping track of the count of the default case:
+ uint64_t RemainCount = TotalCount;
+ SmallVector<uint64_t, 16> SizeIds;
+ SmallVector<uint64_t, 16> CaseCounts;
+ uint64_t MaxCount = 0;
+ unsigned Version = 0;
+ // Default case is in the front -- save the slot here.
+ CaseCounts.push_back(0);
+ for (auto &VD : VDs) {
+ int64_t V = VD.Value;
+ uint64_t C = VD.Count;
+ if (MemOPScaleCount)
+ C = getScaledCount(C, ActualCount, SavedTotalCount);
+
+ // Only care precise value here.
+ if (getMemOPSizeKind(V) != PreciseValue)
+ continue;
+
+ // ValueCounts are sorted on the count. Break at the first un-profitable
+ // value.
+ if (!isProfitable(C, RemainCount))
+ break;
+
+ SizeIds.push_back(V);
+ CaseCounts.push_back(C);
+ if (C > MaxCount)
+ MaxCount = C;
+
+ assert(RemainCount >= C);
+ RemainCount -= C;
+
+ if (++Version > MemOPMaxVersion && MemOPMaxVersion != 0)
+ break;
+ }
+
+ if (Version == 0)
+ return false;
+
+ CaseCounts[0] = RemainCount;
+ if (RemainCount > MaxCount)
+ MaxCount = RemainCount;
+
+ uint64_t SumForOpt = TotalCount - RemainCount;
+ DEBUG(dbgs() << "Read one memory intrinsic profile: " << SumForOpt << " vs "
+ << TotalCount << "\n");
+ DEBUG(
+ for (auto &VD
+ : VDs) { dbgs() << " (" << VD.Value << "," << VD.Count << ")\n"; });
+
+ DEBUG(dbgs() << "Optimize one memory intrinsic call to " << Version
+ << " Versions\n");
+
+ // mem_op(..., size)
+ // ==>
+ // switch (size) {
+ // case s1:
+ // mem_op(..., s1);
+ // goto merge_bb;
+ // case s2:
+ // mem_op(..., s2);
+ // goto merge_bb;
+ // ...
+ // default:
+ // mem_op(..., size);
+ // goto merge_bb;
+ // }
+ // merge_bb:
+
+ BasicBlock *BB = MI->getParent();
+ DEBUG(dbgs() << "\n\n== Basic Block Before ==\n");
+ DEBUG(dbgs() << *BB << "\n");
+
+ BasicBlock *DefaultBB = SplitBlock(BB, MI);
+ BasicBlock::iterator It(*MI);
+ ++It;
+ assert(It != DefaultBB->end());
+ BasicBlock *MergeBB = SplitBlock(DefaultBB, &(*It));
+ DefaultBB->setName("MemOP.Default");
+ MergeBB->setName("MemOP.Merge");
+
+ auto &Ctx = Func.getContext();
+ IRBuilder<> IRB(BB);
+ BB->getTerminator()->eraseFromParent();
+ Value *SizeVar = MI->getLength();
+ SwitchInst *SI = IRB.CreateSwitch(SizeVar, DefaultBB, SizeIds.size());
+
+ // Clear the value profile data.
+ MI->setMetadata(LLVMContext::MD_prof, nullptr);
+
+ DEBUG(dbgs() << "\n\n== Basic Block After==\n");
+
+ for (uint64_t SizeId : SizeIds) {
+ ConstantInt *CaseSizeId = ConstantInt::get(Type::getInt64Ty(Ctx), SizeId);
+ BasicBlock *CaseBB = BasicBlock::Create(
+ Ctx, Twine("MemOP.Case.") + Twine(SizeId), &Func, DefaultBB);
+ Instruction *NewInst = MI->clone();
+ // Fix the argument.
+ dyn_cast<MemIntrinsic>(NewInst)->setLength(CaseSizeId);
+ CaseBB->getInstList().push_back(NewInst);
+ IRBuilder<> IRBCase(CaseBB);
+ IRBCase.CreateBr(MergeBB);
+ SI->addCase(CaseSizeId, CaseBB);
+ DEBUG(dbgs() << *CaseBB << "\n");
+ }
+ setProfMetadata(Func.getParent(), SI, CaseCounts, MaxCount);
+
+ DEBUG(dbgs() << *BB << "\n");
+ DEBUG(dbgs() << *DefaultBB << "\n");
+ DEBUG(dbgs() << *MergeBB << "\n");
+
+ emitOptimizationRemark(Func.getContext(), "memop-opt", Func,
+ MI->getDebugLoc(),
+ Twine("optimize ") + getMIName(MI) + " with count " +
+ Twine(SumForOpt) + " out of " + Twine(TotalCount) +
+ " for " + Twine(Version) + " versions");
+
+ return true;
+}
+} // namespace
+
+static bool PGOMemOPSizeOptImpl(Function &F, BlockFrequencyInfo &BFI) {
+ if (DisableMemOPOPT)
+ return false;
+
+ if (F.hasFnAttribute(Attribute::OptimizeForSize))
+ return false;
+ MemOPSizeOpt MemOPSizeOpt(F, BFI);
+ MemOPSizeOpt.perform();
+ return MemOPSizeOpt.isChanged();
+}
+
+bool PGOMemOPSizeOptLegacyPass::runOnFunction(Function &F) {
+ BlockFrequencyInfo &BFI =
+ getAnalysis<BlockFrequencyInfoWrapperPass>().getBFI();
+ return PGOMemOPSizeOptImpl(F, BFI);
+}
+
+namespace llvm {
+char &PGOMemOPSizeOptID = PGOMemOPSizeOptLegacyPass::ID;
+
+PreservedAnalyses PGOMemOPSizeOpt::run(Function &F,
+ FunctionAnalysisManager &FAM) {
+ auto &BFI = FAM.getResult<BlockFrequencyAnalysis>(F);
+ bool Changed = PGOMemOPSizeOptImpl(F, BFI);
+ if (!Changed)
+ return PreservedAnalyses::all();
+ return PreservedAnalyses::none();
+}
+} // namespace llvm
diff --git a/llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp b/llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
index f2c1932..1f8bcb9 100644
--- a/llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
+++ b/llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
@@ -51,6 +51,21 @@
#define DEBUG_TYPE "instrprof"
+// The start and end values of precise value profile range for memory
+// intrinsic sizes
+cl::opt<std::string> MemOPSizeRange(
+ "memop-size-range",
+ cl::desc("Set the range of size in memory intrinsic calls to be profiled "
+ "precisely, in a format of <start_val>:<end_val>"),
+ cl::init(""));
+
+// The value that considered to be large value in memory intrinsic.
+cl::opt<unsigned> MemOPSizeLarge(
+ "memop-size-large",
+ cl::desc("Set large value thresthold in memory intrinsic size profiling. "
+ "Value of 0 disables the large value profiling."),
+ cl::init(8192));
+
namespace {
cl::opt<bool> DoNameCompression("enable-name-compression",
@@ -77,17 +92,6 @@
// is usually smaller than 2.
cl::init(1.0));
-cl::opt<std::string> MemOPSizeRange(
- "memop-size-range",
- cl::desc("Set the range of size in memory intrinsic calls to be profiled "
- "precisely, in a format of <start_val>:<end_val>"),
- cl::init(""));
-cl::opt<unsigned> MemOPSizeLarge(
- "memop-size-large",
- cl::desc("Set large value thresthold in memory intrinsic size profiling. "
- "Value of 0 disables the large value profiling."),
- cl::init(8192));
-
class InstrProfilingLegacyPass : public ModulePass {
InstrProfiling InstrProf;
@@ -176,7 +180,8 @@
NamesSize = 0;
ProfileDataMap.clear();
UsedVars.clear();
- getMemOPSizeOptions();
+ getMemOPSizeRangeFromOption(MemOPSizeRange, MemOPSizeRangeStart,
+ MemOPSizeRangeLast);
// We did not know how many value sites there would be inside
// the instrumented function. This is counting the number of instrumented
@@ -299,12 +304,13 @@
Builder.getInt32(Index)};
Call = Builder.CreateCall(getOrInsertValueProfilingCall(*M, *TLI), Args);
} else {
- Value *Args[6] = {Ind->getTargetValue(),
- Builder.CreateBitCast(DataVar, Builder.getInt8PtrTy()),
- Builder.getInt32(Index),
- Builder.getInt64(MemOPSizeRangeStart),
- Builder.getInt64(MemOPSizeRangeLast),
- Builder.getInt64(MemOPSizeLargeVal)};
+ Value *Args[6] = {
+ Ind->getTargetValue(),
+ Builder.CreateBitCast(DataVar, Builder.getInt8PtrTy()),
+ Builder.getInt32(Index),
+ Builder.getInt64(MemOPSizeRangeStart),
+ Builder.getInt64(MemOPSizeRangeLast),
+ Builder.getInt64(MemOPSizeLarge == 0 ? INT64_MIN : MemOPSizeLarge)};
Call =
Builder.CreateCall(getOrInsertValueProfilingCall(*M, *TLI, true), Args);
}
@@ -700,24 +706,3 @@
appendToGlobalCtors(*M, F, 0);
}
-
-void InstrProfiling::getMemOPSizeOptions() {
- // Parse the value profile options.
- MemOPSizeRangeStart = DefaultMemOPSizeRangeStart;
- MemOPSizeRangeLast = DefaultMemOPSizeRangeLast;
- if (!MemOPSizeRange.empty()) {
- auto Pos = MemOPSizeRange.find(":");
- if (Pos != std::string::npos) {
- if (Pos > 0)
- MemOPSizeRangeStart = atoi(MemOPSizeRange.substr(0, Pos).c_str());
- if (Pos < MemOPSizeRange.size() - 1)
- MemOPSizeRangeLast = atoi(MemOPSizeRange.substr(Pos + 1).c_str());
- } else
- MemOPSizeRangeLast = atoi(MemOPSizeRange.c_str());
- }
- assert(MemOPSizeRangeLast >= MemOPSizeRangeStart);
-
- MemOPSizeLargeVal = MemOPSizeLarge;
- if (MemOPSizeLargeVal == 0)
- MemOPSizeLargeVal = INT64_MIN;
-}
diff --git a/llvm/lib/Transforms/Instrumentation/Instrumentation.cpp b/llvm/lib/Transforms/Instrumentation/Instrumentation.cpp
index 2963d08..7bb62d2 100644
--- a/llvm/lib/Transforms/Instrumentation/Instrumentation.cpp
+++ b/llvm/lib/Transforms/Instrumentation/Instrumentation.cpp
@@ -63,6 +63,7 @@
initializePGOInstrumentationGenLegacyPassPass(Registry);
initializePGOInstrumentationUseLegacyPassPass(Registry);
initializePGOIndirectCallPromotionLegacyPassPass(Registry);
+ initializePGOMemOPSizeOptLegacyPassPass(Registry);
initializeInstrProfilingLegacyPassPass(Registry);
initializeMemorySanitizerPass(Registry);
initializeThreadSanitizerPass(Registry);
diff --git a/llvm/lib/Transforms/Instrumentation/PGOInstrumentation.cpp b/llvm/lib/Transforms/Instrumentation/PGOInstrumentation.cpp
index 7241a2a..990bcec 100644
--- a/llvm/lib/Transforms/Instrumentation/PGOInstrumentation.cpp
+++ b/llvm/lib/Transforms/Instrumentation/PGOInstrumentation.cpp
@@ -1038,21 +1038,6 @@
DEBUG(FuncInfo.dumpInfo("after reading profile."));
}
-static void setProfMetadata(Module *M, Instruction *TI,
- ArrayRef<uint64_t> EdgeCounts, uint64_t MaxCount) {
- MDBuilder MDB(M->getContext());
- assert(MaxCount > 0 && "Bad max count");
- uint64_t Scale = calculateCountScale(MaxCount);
- SmallVector<unsigned, 4> Weights;
- for (const auto &ECI : EdgeCounts)
- Weights.push_back(scaleBranchCount(ECI, Scale));
-
- DEBUG(dbgs() << "Weight is: ";
- for (const auto &W : Weights) { dbgs() << W << " "; }
- dbgs() << "\n";);
- TI->setMetadata(llvm::LLVMContext::MD_prof, MDB.createBranchWeights(Weights));
-}
-
// Assign the scaled count values to the BB with multiple out edges.
void PGOUseFunc::setBranchWeights() {
// Generate MD_prof metadata for every branch instruction.
@@ -1426,6 +1411,21 @@
}
namespace llvm {
+void setProfMetadata(Module *M, Instruction *TI, ArrayRef<uint64_t> EdgeCounts,
+ uint64_t MaxCount) {
+ MDBuilder MDB(M->getContext());
+ assert(MaxCount > 0 && "Bad max count");
+ uint64_t Scale = calculateCountScale(MaxCount);
+ SmallVector<unsigned, 4> Weights;
+ for (const auto &ECI : EdgeCounts)
+ Weights.push_back(scaleBranchCount(ECI, Scale));
+
+ DEBUG(dbgs() << "Weight is: ";
+ for (const auto &W : Weights) { dbgs() << W << " "; }
+ dbgs() << "\n";);
+ TI->setMetadata(llvm::LLVMContext::MD_prof, MDB.createBranchWeights(Weights));
+}
+
template <> struct GraphTraits<PGOUseFunc *> {
typedef const BasicBlock *NodeRef;
typedef succ_const_iterator ChildIteratorType;