[llvm] b1ca2a9 - [PGO] Sampled instrumentation in PGO to speed up instrumentation binary (#69535)
via llvm-commits
llvm-commits at lists.llvm.org
Mon Jul 22 09:19:21 PDT 2024
Author: xur-llvm
Date: 2024-07-22T09:19:17-07:00
New Revision: b1ca2a954643d2c07d5308297d1f2b911f794ba4
URL: https://github.com/llvm/llvm-project/commit/b1ca2a954643d2c07d5308297d1f2b911f794ba4
DIFF: https://github.com/llvm/llvm-project/commit/b1ca2a954643d2c07d5308297d1f2b911f794ba4.diff
LOG: [PGO] Sampled instrumentation in PGO to speed up instrumentation binary (#69535)
In comparison to non-instrumented binaries, PGO instrumentation binaries
can be significantly slower. For highly threaded programs, this slowdown
can
reach 10x due to data races or false sharing within counters.
This patch incorporates sampling into the PGO instrumentation process to
enhance the speed of instrumentation binaries. The fundamental concept
is similar to the one proposed in https://reviews.llvm.org/D63949.
Three sampling modes are introduced:
1. Simple Sampling: When '-sampled-instr-bust-duration' is set to 1.
2. Fast Burst Sampling: When not using simple sampling, and
'-sampled-instr-period' is set to 65535. This is the default mode of
sampling.
3. Full Burst Sampling: When neither simple nor fast burst sampling is
used.
Utilizing this sampled instrumentation significantly improves the
binary's
execution speed. Measurements show up to 5x speedup with default
settings. Fast burst sampling now results in only around 20% to 30%
slowdown (compared to 8 to 10x slowdown without sampling).
Out tests show that profile quality remains good with sampling,
with edge counts typically showing more than 90% overlap.
For applications whose behavior changes due to binary speed,
sampling instrumentation can enhance performance.
Observations have shown some apps experiencing up to
a ~2% improvement in PGO.
A potential drawback of this patch is the increased binary size
and compilation time. The Sampling method in this patch does
not improve single threaded program instrumentation binary
speed.
Added:
llvm/test/Transforms/PGOProfile/Inputs/cspgo_bar_sample.ll
llvm/test/Transforms/PGOProfile/counter_promo_sampling.ll
llvm/test/Transforms/PGOProfile/cspgo_sample.ll
llvm/test/Transforms/PGOProfile/instrprof_burst_sampling_fast.ll
llvm/test/Transforms/PGOProfile/instrprof_burst_sampling_full.ll
llvm/test/Transforms/PGOProfile/instrprof_burst_sampling_full_intsize.ll
llvm/test/Transforms/PGOProfile/instrprof_simple_sampling.ll
Modified:
llvm/include/llvm/ProfileData/InstrProfData.inc
llvm/include/llvm/Transforms/Instrumentation.h
llvm/include/llvm/Transforms/Instrumentation/PGOInstrumentation.h
llvm/lib/Passes/PassBuilderPipelines.cpp
llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
llvm/lib/Transforms/Instrumentation/PGOInstrumentation.cpp
Removed:
################################################################################
diff --git a/llvm/include/llvm/ProfileData/InstrProfData.inc b/llvm/include/llvm/ProfileData/InstrProfData.inc
index e9866d94b762c..847e53cfa7432 100644
--- a/llvm/include/llvm/ProfileData/InstrProfData.inc
+++ b/llvm/include/llvm/ProfileData/InstrProfData.inc
@@ -739,6 +739,7 @@ serializeValueProfDataFrom(ValueProfRecordClosure *Closure,
#define INSTR_PROF_PROFILE_RUNTIME_VAR __llvm_profile_runtime
#define INSTR_PROF_PROFILE_COUNTER_BIAS_VAR __llvm_profile_counter_bias
#define INSTR_PROF_PROFILE_SET_TIMESTAMP __llvm_profile_set_timestamp
+#define INSTR_PROF_PROFILE_SAMPLING_VAR __llvm_profile_sampling
/* The variable that holds the name of the profile data
* specified via command line. */
diff --git a/llvm/include/llvm/Transforms/Instrumentation.h b/llvm/include/llvm/Transforms/Instrumentation.h
index ea97ab2562a5b..969c2cd12f3f0 100644
--- a/llvm/include/llvm/Transforms/Instrumentation.h
+++ b/llvm/include/llvm/Transforms/Instrumentation.h
@@ -121,12 +121,18 @@ struct InstrProfOptions {
// Use BFI to guide register promotion
bool UseBFIInPromotion = false;
+ // Use sampling to reduce the profile instrumentation runtime overhead.
+ bool Sampling = false;
+
// Name of the profile file to use as output
std::string InstrProfileOutput;
InstrProfOptions() = default;
};
+// Create the variable for profile sampling.
+void createProfileSamplingVar(Module &M);
+
// Options for sanitizer coverage instrumentation.
struct SanitizerCoverageOptions {
enum Type {
diff --git a/llvm/include/llvm/Transforms/Instrumentation/PGOInstrumentation.h b/llvm/include/llvm/Transforms/Instrumentation/PGOInstrumentation.h
index 5b1977b7de9a2..7199f27dbc991 100644
--- a/llvm/include/llvm/Transforms/Instrumentation/PGOInstrumentation.h
+++ b/llvm/include/llvm/Transforms/Instrumentation/PGOInstrumentation.h
@@ -43,12 +43,14 @@ class FileSystem;
class PGOInstrumentationGenCreateVar
: public PassInfoMixin<PGOInstrumentationGenCreateVar> {
public:
- PGOInstrumentationGenCreateVar(std::string CSInstrName = "")
- : CSInstrName(CSInstrName) {}
+ PGOInstrumentationGenCreateVar(std::string CSInstrName = "",
+ bool Sampling = false)
+ : CSInstrName(CSInstrName), ProfileSampling(Sampling) {}
PreservedAnalyses run(Module &M, ModuleAnalysisManager &MAM);
private:
std::string CSInstrName;
+ bool ProfileSampling;
};
/// The instrumentation (profile-instr-gen) pass for IR based PGO.
diff --git a/llvm/lib/Passes/PassBuilderPipelines.cpp b/llvm/lib/Passes/PassBuilderPipelines.cpp
index 4fd5ee1946bb7..935504b070d2e 100644
--- a/llvm/lib/Passes/PassBuilderPipelines.cpp
+++ b/llvm/lib/Passes/PassBuilderPipelines.cpp
@@ -296,6 +296,9 @@ static cl::opt<AttributorRunOption> AttributorRun(
clEnumValN(AttributorRunOption::NONE, "none",
"disable attributor runs")));
+static cl::opt<bool> EnableSampledInstr(
+ "enable-sampled-instrumentation", cl::init(false), cl::Hidden,
+ cl::desc("Enable profile instrumentation sampling (default = off)"));
static cl::opt<bool> UseLoopVersioningLICM(
"enable-loop-versioning-licm", cl::init(false), cl::Hidden,
cl::desc("Enable the experimental Loop Versioning LICM pass"));
@@ -847,6 +850,12 @@ void PassBuilder::addPGOInstrPasses(ModulePassManager &MPM,
// Do counter promotion at Level greater than O0.
Options.DoCounterPromotion = true;
Options.UseBFIInPromotion = IsCS;
+ if (EnableSampledInstr) {
+ Options.Sampling = true;
+ // With sampling, there is little beneifit to enable counter promotion.
+ // But note that sampling does work with counter promotion.
+ Options.DoCounterPromotion = false;
+ }
Options.Atomic = AtomicCounterUpdate;
MPM.addPass(InstrProfilingLoweringPass(Options, IsCS));
}
@@ -1185,7 +1194,8 @@ PassBuilder::buildModuleSimplificationPipeline(OptimizationLevel Level,
MPM.addPass(PGOIndirectCallPromotion(false, false));
if (IsPGOPreLink && PGOOpt->CSAction == PGOOptions::CSIRInstr)
- MPM.addPass(PGOInstrumentationGenCreateVar(PGOOpt->CSProfileGenFile));
+ MPM.addPass(PGOInstrumentationGenCreateVar(PGOOpt->CSProfileGenFile,
+ EnableSampledInstr));
if (IsMemprofUse)
MPM.addPass(MemProfUsePass(PGOOpt->MemoryProfile, PGOOpt->FS));
diff --git a/llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp b/llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
index 09c56eb5fe6aa..d1396071c0bad 100644
--- a/llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
+++ b/llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
@@ -170,6 +170,30 @@ cl::opt<bool> SkipRetExitBlock(
"skip-ret-exit-block", cl::init(true),
cl::desc("Suppress counter promotion if exit blocks contain ret."));
+static cl::opt<bool> SampledInstr("sampled-instrumentation", cl::ZeroOrMore,
+ cl::init(false),
+ cl::desc("Do PGO instrumentation sampling"));
+
+static cl::opt<unsigned> SampledInstrPeriod(
+ "sampled-instr-period",
+ cl::desc("Set the profile instrumentation sample period. For each sample "
+ "period, a fixed number of consecutive samples will be recorded. "
+ "The number is controlled by 'sampled-instr-burst-duration' flag. "
+ "The default sample period of 65535 is optimized for generating "
+ "efficient code that leverages unsigned integer wrapping in "
+ "overflow."),
+ cl::init(65535));
+
+static cl::opt<unsigned> SampledInstrBurstDuration(
+ "sampled-instr-burst-duration",
+ cl::desc("Set the profile instrumentation burst duration, which can range "
+ "from 0 to one less than the value of 'sampled-instr-period'. "
+ "This number of samples will be recorded for each "
+ "'sampled-instr-period' count update. Setting to 1 enables "
+ "simple sampling, in which case it is recommended to set "
+ "'sampled-instr-period' to a prime number."),
+ cl::init(200));
+
using LoadStorePair = std::pair<Instruction *, Instruction *>;
static uint64_t getIntModuleFlagOrZero(const Module &M, StringRef Flag) {
@@ -260,6 +284,9 @@ class InstrLowerer final {
/// Returns true if profile counter update register promotion is enabled.
bool isCounterPromotionEnabled() const;
+ /// Return true if profile sampling is enabled.
+ bool isSamplingEnabled() const;
+
/// Count the number of instrumented value sites for the function.
void computeNumValueSiteCounts(InstrProfValueProfileInst *Ins);
@@ -291,6 +318,9 @@ class InstrLowerer final {
/// acts on.
Value *getCounterAddress(InstrProfCntrInstBase *I);
+ /// Lower the incremental instructions under profile sampling predicates.
+ void doSampling(Instruction *I);
+
/// Get the region counters for an increment, creating them if necessary.
///
/// If the counter array doesn't yet exist, the profile data variables
@@ -635,33 +665,169 @@ PreservedAnalyses InstrProfilingLoweringPass::run(Module &M,
return PreservedAnalyses::none();
}
+//
+// Perform instrumentation sampling.
+//
+// There are 3 favors of sampling:
+// (1) Full burst sampling: We transform:
+// Increment_Instruction;
+// to:
+// if (__llvm_profile_sampling__ < SampledInstrBurstDuration) {
+// Increment_Instruction;
+// }
+// __llvm_profile_sampling__ += 1;
+// if (__llvm_profile_sampling__ >= SampledInstrPeriod) {
+// __llvm_profile_sampling__ = 0;
+// }
+//
+// "__llvm_profile_sampling__" is a thread-local global shared by all PGO
+// counters (value-instrumentation and edge instrumentation).
+//
+// (2) Fast burst sampling:
+// "__llvm_profile_sampling__" variable is an unsigned type, meaning it will
+// wrap around to zero when overflows. In this case, the second check is
+// unnecessary, so we won't generate check2 when the SampledInstrPeriod is
+// set to 65535 (64K - 1). The code after:
+// if (__llvm_profile_sampling__ < SampledInstrBurstDuration) {
+// Increment_Instruction;
+// }
+// __llvm_profile_sampling__ += 1;
+//
+// (3) Simple sampling:
+// When SampledInstrBurstDuration sets to 1, we do a simple sampling:
+// __llvm_profile_sampling__ += 1;
+// if (__llvm_profile_sampling__ >= SampledInstrPeriod) {
+// __llvm_profile_sampling__ = 0;
+// Increment_Instruction;
+// }
+//
+// Note that, the code snippet after the transformation can still be counter
+// promoted. However, with sampling enabled, counter updates are expected to
+// be infrequent, making the benefits of counter promotion negligible.
+// Moreover, counter promotion can potentially cause issues in server
+// applications, particularly when the counters are dumped without a clean
+// exit. To mitigate this risk, counter promotion is disabled by default when
+// sampling is enabled. This behavior can be overridden using the internal
+// option.
+void InstrLowerer::doSampling(Instruction *I) {
+ if (!isSamplingEnabled())
+ return;
+
+ unsigned SampledBurstDuration = SampledInstrBurstDuration.getValue();
+ unsigned SampledPeriod = SampledInstrPeriod.getValue();
+ if (SampledBurstDuration >= SampledPeriod) {
+ report_fatal_error(
+ "SampledPeriod needs to be greater than SampledBurstDuration");
+ }
+ bool UseShort = (SampledPeriod <= USHRT_MAX);
+ bool IsSimpleSampling = (SampledBurstDuration == 1);
+ // If (SampledBurstDuration == 1 && SampledPeriod == 65535), generate
+ // the simple sampling style code.
+ bool IsFastSampling = (!IsSimpleSampling && SampledPeriod == 65535);
+
+ auto GetConstant = [UseShort](IRBuilder<> &Builder, uint32_t C) {
+ if (UseShort)
+ return Builder.getInt16(C);
+ else
+ return Builder.getInt32(C);
+ };
+
+ IntegerType *SamplingVarTy;
+ if (UseShort)
+ SamplingVarTy = Type::getInt16Ty(M.getContext());
+ else
+ SamplingVarTy = Type::getInt32Ty(M.getContext());
+ auto *SamplingVar =
+ M.getGlobalVariable(INSTR_PROF_QUOTE(INSTR_PROF_PROFILE_SAMPLING_VAR));
+ assert(SamplingVar && "SamplingVar not set properly");
+
+ // Create the condition for checking the burst duration.
+ Instruction *SamplingVarIncr;
+ Value *NewSamplingVarVal;
+ MDBuilder MDB(I->getContext());
+ MDNode *BranchWeight;
+ IRBuilder<> CondBuilder(I);
+ auto *LoadSamplingVar = CondBuilder.CreateLoad(SamplingVarTy, SamplingVar);
+ if (IsSimpleSampling) {
+ // For the simple sampling, just create the load and increments.
+ IRBuilder<> IncBuilder(I);
+ NewSamplingVarVal =
+ IncBuilder.CreateAdd(LoadSamplingVar, GetConstant(IncBuilder, 1));
+ SamplingVarIncr = IncBuilder.CreateStore(NewSamplingVarVal, SamplingVar);
+ } else {
+ // For the bust-sampling, create the conditonal update.
+ auto *DurationCond = CondBuilder.CreateICmpULE(
+ LoadSamplingVar, GetConstant(CondBuilder, SampledBurstDuration));
+ BranchWeight = MDB.createBranchWeights(
+ SampledBurstDuration, SampledPeriod + 1 - SampledBurstDuration);
+ Instruction *ThenTerm = SplitBlockAndInsertIfThen(
+ DurationCond, I, /* Unreachable */ false, BranchWeight);
+ IRBuilder<> IncBuilder(I);
+ NewSamplingVarVal =
+ IncBuilder.CreateAdd(LoadSamplingVar, GetConstant(IncBuilder, 1));
+ SamplingVarIncr = IncBuilder.CreateStore(NewSamplingVarVal, SamplingVar);
+ I->moveBefore(ThenTerm);
+ }
+
+ if (IsFastSampling)
+ return;
+
+ // Create the condtion for checking the period.
+ Instruction *ThenTerm, *ElseTerm;
+ IRBuilder<> PeriodCondBuilder(SamplingVarIncr);
+ auto *PeriodCond = PeriodCondBuilder.CreateICmpUGE(
+ NewSamplingVarVal, GetConstant(PeriodCondBuilder, SampledPeriod));
+ BranchWeight = MDB.createBranchWeights(1, SampledPeriod);
+ SplitBlockAndInsertIfThenElse(PeriodCond, SamplingVarIncr, &ThenTerm,
+ &ElseTerm, BranchWeight);
+
+ // For the simple sampling, the counter update happens in sampling var reset.
+ if (IsSimpleSampling)
+ I->moveBefore(ThenTerm);
+
+ IRBuilder<> ResetBuilder(ThenTerm);
+ ResetBuilder.CreateStore(GetConstant(ResetBuilder, 0), SamplingVar);
+ SamplingVarIncr->moveBefore(ElseTerm);
+}
+
bool InstrLowerer::lowerIntrinsics(Function *F) {
bool MadeChange = false;
PromotionCandidates.clear();
+ SmallVector<InstrProfInstBase *, 8> InstrProfInsts;
+
+ // To ensure compatibility with sampling, we save the intrinsics into
+ // a buffer to prevent potential breakage of the iterator (as the
+ // intrinsics will be moved to a
diff erent BB).
for (BasicBlock &BB : *F) {
for (Instruction &Instr : llvm::make_early_inc_range(BB)) {
- if (auto *IPIS = dyn_cast<InstrProfIncrementInstStep>(&Instr)) {
- lowerIncrement(IPIS);
- MadeChange = true;
- } else if (auto *IPI = dyn_cast<InstrProfIncrementInst>(&Instr)) {
- lowerIncrement(IPI);
- MadeChange = true;
- } else if (auto *IPC = dyn_cast<InstrProfTimestampInst>(&Instr)) {
- lowerTimestamp(IPC);
- MadeChange = true;
- } else if (auto *IPC = dyn_cast<InstrProfCoverInst>(&Instr)) {
- lowerCover(IPC);
- MadeChange = true;
- } else if (auto *IPVP = dyn_cast<InstrProfValueProfileInst>(&Instr)) {
- lowerValueProfileInst(IPVP);
- MadeChange = true;
- } else if (auto *IPMP = dyn_cast<InstrProfMCDCBitmapParameters>(&Instr)) {
- IPMP->eraseFromParent();
- MadeChange = true;
- } else if (auto *IPBU = dyn_cast<InstrProfMCDCTVBitmapUpdate>(&Instr)) {
- lowerMCDCTestVectorBitmapUpdate(IPBU);
- MadeChange = true;
- }
+ if (auto *IP = dyn_cast<InstrProfInstBase>(&Instr))
+ InstrProfInsts.push_back(IP);
+ }
+ }
+
+ for (auto *Instr : InstrProfInsts) {
+ doSampling(Instr);
+ if (auto *IPIS = dyn_cast<InstrProfIncrementInstStep>(Instr)) {
+ lowerIncrement(IPIS);
+ MadeChange = true;
+ } else if (auto *IPI = dyn_cast<InstrProfIncrementInst>(Instr)) {
+ lowerIncrement(IPI);
+ MadeChange = true;
+ } else if (auto *IPC = dyn_cast<InstrProfTimestampInst>(Instr)) {
+ lowerTimestamp(IPC);
+ MadeChange = true;
+ } else if (auto *IPC = dyn_cast<InstrProfCoverInst>(Instr)) {
+ lowerCover(IPC);
+ MadeChange = true;
+ } else if (auto *IPVP = dyn_cast<InstrProfValueProfileInst>(Instr)) {
+ lowerValueProfileInst(IPVP);
+ MadeChange = true;
+ } else if (auto *IPMP = dyn_cast<InstrProfMCDCBitmapParameters>(Instr)) {
+ IPMP->eraseFromParent();
+ MadeChange = true;
+ } else if (auto *IPBU = dyn_cast<InstrProfMCDCTVBitmapUpdate>(Instr)) {
+ lowerMCDCTestVectorBitmapUpdate(IPBU);
+ MadeChange = true;
}
}
@@ -684,6 +850,12 @@ bool InstrLowerer::isRuntimeCounterRelocationEnabled() const {
return TT.isOSFuchsia();
}
+bool InstrLowerer::isSamplingEnabled() const {
+ if (SampledInstr.getNumOccurrences() > 0)
+ return SampledInstr;
+ return Options.Sampling;
+}
+
bool InstrLowerer::isCounterPromotionEnabled() const {
if (DoCounterPromotion.getNumOccurrences() > 0)
return DoCounterPromotion;
@@ -754,6 +926,9 @@ bool InstrLowerer::lower() {
if (NeedsRuntimeHook)
MadeChange = emitRuntimeHook();
+ if (!IsCS && isSamplingEnabled())
+ createProfileSamplingVar(M);
+
bool ContainsProfiling = containsProfilingIntrinsics(M);
GlobalVariable *CoverageNamesVar =
M.getNamedGlobal(getCoverageUnusedNamesVarName());
@@ -1955,3 +2130,29 @@ void InstrLowerer::emitInitialization() {
appendToGlobalCtors(M, F, 0);
}
+
+namespace llvm {
+// Create the variable for profile sampling.
+void createProfileSamplingVar(Module &M) {
+ const StringRef VarName(INSTR_PROF_QUOTE(INSTR_PROF_PROFILE_SAMPLING_VAR));
+ IntegerType *SamplingVarTy;
+ Constant *ValueZero;
+ if (SampledInstrPeriod.getValue() <= USHRT_MAX) {
+ SamplingVarTy = Type::getInt16Ty(M.getContext());
+ ValueZero = Constant::getIntegerValue(SamplingVarTy, APInt(16, 0));
+ } else {
+ SamplingVarTy = Type::getInt32Ty(M.getContext());
+ ValueZero = Constant::getIntegerValue(SamplingVarTy, APInt(32, 0));
+ }
+ auto SamplingVar = new GlobalVariable(
+ M, SamplingVarTy, false, GlobalValue::WeakAnyLinkage, ValueZero, VarName);
+ SamplingVar->setVisibility(GlobalValue::DefaultVisibility);
+ SamplingVar->setThreadLocal(true);
+ Triple TT(M.getTargetTriple());
+ if (TT.supportsCOMDAT()) {
+ SamplingVar->setLinkage(GlobalValue::ExternalLinkage);
+ SamplingVar->setComdat(M.getOrInsertComdat(VarName));
+ }
+ appendToCompilerUsed(M, SamplingVar);
+}
+} // namespace llvm
diff --git a/llvm/lib/Transforms/Instrumentation/PGOInstrumentation.cpp b/llvm/lib/Transforms/Instrumentation/PGOInstrumentation.cpp
index 35b1bbf21be97..4f0ccc8f962db 100644
--- a/llvm/lib/Transforms/Instrumentation/PGOInstrumentation.cpp
+++ b/llvm/lib/Transforms/Instrumentation/PGOInstrumentation.cpp
@@ -1875,6 +1875,8 @@ PGOInstrumentationGenCreateVar::run(Module &M, ModuleAnalysisManager &MAM) {
// The variable in a comdat may be discarded by LTO. Ensure the declaration
// will be retained.
appendToCompilerUsed(M, createIRLevelProfileFlagVar(M, /*IsCS=*/true));
+ if (ProfileSampling)
+ createProfileSamplingVar(M);
PreservedAnalyses PA;
PA.preserve<FunctionAnalysisManagerModuleProxy>();
PA.preserveSet<AllAnalysesOn<Function>>();
diff --git a/llvm/test/Transforms/PGOProfile/Inputs/cspgo_bar_sample.ll b/llvm/test/Transforms/PGOProfile/Inputs/cspgo_bar_sample.ll
new file mode 100644
index 0000000000000..1c8be82715f25
--- /dev/null
+++ b/llvm/test/Transforms/PGOProfile/Inputs/cspgo_bar_sample.ll
@@ -0,0 +1,82 @@
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+$__llvm_profile_filename = comdat any
+$__llvm_profile_raw_version = comdat any
+$__llvm_profile_sampling = comdat any
+
+ at odd = common dso_local local_unnamed_addr global i32 0, align 4
+ at even = common dso_local local_unnamed_addr global i32 0, align 4
+ at __llvm_profile_filename = local_unnamed_addr constant [25 x i8] c"pass2/default_%m.profraw\00", comdat
+ at __llvm_profile_raw_version = local_unnamed_addr constant i64 216172782113783812, comdat
+ at __llvm_profile_sampling = thread_local global i16 0, comdat
+ at llvm.used = appending global [1 x i8*] [i8* bitcast (i64* @__llvm_profile_sampling to i8*)], section "llvm.metadata"
+
+define dso_local void @bar(i32 %n) !prof !30 {
+entry:
+ %call = tail call fastcc i32 @cond(i32 %n)
+ %tobool = icmp eq i32 %call, 0
+ br i1 %tobool, label %if.else, label %if.then, !prof !31
+
+if.then:
+ %0 = load i32, i32* @odd, align 4, !tbaa !32
+ %inc = add i32 %0, 1
+ store i32 %inc, i32* @odd, align 4, !tbaa !32
+ br label %if.end
+
+if.else:
+ %1 = load i32, i32* @even, align 4, !tbaa !32
+ %inc1 = add i32 %1, 1
+ store i32 %inc1, i32* @even, align 4, !tbaa !32
+ br label %if.end
+
+if.end:
+ ret void
+}
+
+define internal fastcc i32 @cond(i32 %i) #1 !prof !30 !PGOFuncName !36 {
+entry:
+ %rem = srem i32 %i, 2
+ ret i32 %rem
+}
+
+attributes #1 = { inlinehint noinline }
+
+!llvm.module.flags = !{!0, !1, !2}
+
+!0 = !{i32 1, !"wchar_size", i32 4}
+!1 = !{i32 1, !"EnableSplitLTOUnit", i32 0}
+!2 = !{i32 1, !"ProfileSummary", !3}
+!3 = !{!4, !5, !6, !7, !8, !9, !10, !11}
+!4 = !{!"ProfileFormat", !"InstrProf"}
+!5 = !{!"TotalCount", i64 500002}
+!6 = !{!"MaxCount", i64 200000}
+!7 = !{!"MaxInternalCount", i64 100000}
+!8 = !{!"MaxFunctionCount", i64 200000}
+!9 = !{!"NumCounts", i64 6}
+!10 = !{!"NumFunctions", i64 4}
+!11 = !{!"DetailedSummary", !12}
+!12 = !{!13, !14, !15, !16, !17, !18, !19, !20, !21, !22, !23, !24, !25, !26, !27, !28}
+!13 = !{i32 10000, i64 200000, i32 1}
+!14 = !{i32 100000, i64 200000, i32 1}
+!15 = !{i32 200000, i64 200000, i32 1}
+!16 = !{i32 300000, i64 200000, i32 1}
+!17 = !{i32 400000, i64 200000, i32 1}
+!18 = !{i32 500000, i64 100000, i32 4}
+!19 = !{i32 600000, i64 100000, i32 4}
+!20 = !{i32 700000, i64 100000, i32 4}
+!21 = !{i32 800000, i64 100000, i32 4}
+!22 = !{i32 900000, i64 100000, i32 4}
+!23 = !{i32 950000, i64 100000, i32 4}
+!24 = !{i32 990000, i64 100000, i32 4}
+!25 = !{i32 999000, i64 100000, i32 4}
+!26 = !{i32 999900, i64 100000, i32 4}
+!27 = !{i32 999990, i64 100000, i32 4}
+!28 = !{i32 999999, i64 1, i32 6}
+!30 = !{!"function_entry_count", i64 200000}
+!31 = !{!"branch_weights", i32 100000, i32 100000}
+!32 = !{!33, !33, i64 0}
+!33 = !{!"int", !34, i64 0}
+!34 = !{!"omnipotent char", !35, i64 0}
+!35 = !{!"Simple C/C++ TBAA"}
+!36 = !{!"cspgo_bar.c:cond"}
diff --git a/llvm/test/Transforms/PGOProfile/counter_promo_sampling.ll b/llvm/test/Transforms/PGOProfile/counter_promo_sampling.ll
new file mode 100644
index 0000000000000..9d083fe04015e
--- /dev/null
+++ b/llvm/test/Transforms/PGOProfile/counter_promo_sampling.ll
@@ -0,0 +1,78 @@
+; RUN: opt < %s --passes=pgo-instr-gen,instrprof --do-counter-promotion=true --sampled-instrumentation=true --skip-ret-exit-block=0 -S | FileCheck --check-prefixes=SAMPLING,PROMO %s
+
+; SAMPLING: $__llvm_profile_sampling = comdat any
+; SAMPLING: @__llvm_profile_sampling = thread_local global i16 0, comdat
+
+define void @foo(i32 %n, i32 %N) {
+; SAMPLING-LABEL: @foo
+; SAMPLING: %[[VV0:[0-9]+]] = load i16, ptr @__llvm_profile_sampling, align 2
+; SAMPLING: %[[VV1:[0-9]+]] = icmp ule i16 %[[VV0]], 200
+; SAMPLING: br i1 %[[VV1]], label {{.*}}, label {{.*}}, !prof !0
+; SAMPLING: {{.*}} = load {{.*}} @__profc_foo{{.*}} 3)
+; SAMPLING-NEXT: add
+; SAMPLING-NEXT: store {{.*}}@__profc_foo{{.*}}3)
+bb:
+ %tmp = add nsw i32 %n, 1
+ %tmp1 = add nsw i32 %n, -1
+ br label %bb2
+
+bb2:
+; PROMO: phi {{.*}}
+; PROMO-NEXT: phi {{.*}}
+; PROMO-NEXT: phi {{.*}}
+; PROMO-NEXT: phi {{.*}}
+ %i.0 = phi i32 [ 0, %bb ], [ %tmp10, %bb9 ]
+ %tmp3 = icmp slt i32 %i.0, %tmp
+ br i1 %tmp3, label %bb4, label %bb5
+
+bb4:
+ tail call void @bar(i32 1)
+ br label %bb9
+
+bb5:
+ %tmp6 = icmp slt i32 %i.0, %tmp1
+ br i1 %tmp6, label %bb7, label %bb8
+
+bb7:
+ tail call void @bar(i32 2)
+ br label %bb9
+
+bb8:
+ tail call void @bar(i32 3)
+ br label %bb9
+
+bb9:
+; SAMPLING: phi {{.*}}
+; SAMPLING-NEXT: %[[V1:[0-9]+]] = add i16 {{.*}}, 1
+; SAMPLING-NEXT: store i16 %[[V1]], ptr @__llvm_profile_sampling, align 2
+; SAMPLING: phi {{.*}}
+; SAMPLING-NEXT: %[[V2:[0-9]+]] = add i16 {{.*}}, 1
+; SAMPLING-NEXT: store i16 %[[V2]], ptr @__llvm_profile_sampling, align 2
+; SAMPLING: phi {{.*}}
+; SAMPLING-NEXT: %[[V3:[0-9]+]] = add i16 {{.*}}, 1
+; SAMPLING-NEXT: store i16 %[[V3]], ptr @__llvm_profile_sampling, align 2
+; PROMO: %[[LIVEOUT3:[a-z0-9]+]] = phi {{.*}}
+; PROMO-NEXT: %[[LIVEOUT2:[a-z0-9]+]] = phi {{.*}}
+; PROMO-NEXT: %[[LIVEOUT1:[a-z0-9]+]] = phi {{.*}}
+ %tmp10 = add nsw i32 %i.0, 1
+ %tmp11 = icmp slt i32 %tmp10, %N
+ br i1 %tmp11, label %bb2, label %bb12
+
+bb12:
+ ret void
+; PROMO: %[[CHECK1:[a-z0-9.]+]] = load {{.*}} @__profc_foo{{.*}}
+; PROMO-NEXT: add {{.*}} %[[CHECK1]], %[[LIVEOUT1]]
+; PROMO-NEXT: store {{.*}}@__profc_foo{{.*}}
+; PROMO-NEXT: %[[CHECK2:[a-z0-9.]+]] = load {{.*}} @__profc_foo{{.*}} 1)
+; PROMO-NEXT: add {{.*}} %[[CHECK2]], %[[LIVEOUT2]]
+; PROMO-NEXT: store {{.*}}@__profc_foo{{.*}}1)
+; PROMO-NEXT: %[[CHECK3:[a-z0-9.]+]] = load {{.*}} @__profc_foo{{.*}} 2)
+; PROMO-NEXT: add {{.*}} %[[CHECK3]], %[[LIVEOUT3]]
+; PROMO-NEXT: store {{.*}}@__profc_foo{{.*}}2)
+; PROMO-NOT: @__profc_foo{{.*}})
+
+}
+
+declare void @bar(i32)
+
+; SAMPLING: !0 = !{!"branch_weights", i32 200, i32 65336}
diff --git a/llvm/test/Transforms/PGOProfile/cspgo_sample.ll b/llvm/test/Transforms/PGOProfile/cspgo_sample.ll
new file mode 100644
index 0000000000000..97ad4d00c9d9c
--- /dev/null
+++ b/llvm/test/Transforms/PGOProfile/cspgo_sample.ll
@@ -0,0 +1,112 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
+; REQUIRES: x86-registered-target
+
+; RUN: opt -module-summary %s -o %t1.bc
+; RUN: opt -module-summary %S/Inputs/cspgo_bar_sample.ll -o %t2.bc
+; RUN: llvm-lto2 run -lto-cspgo-profile-file=alloc -enable-sampled-instrumentation -lto-cspgo-gen -save-temps -o %t %t1.bc %t2.bc \
+; RUN: -r=%t1.bc,foo,pl \
+; RUN: -r=%t1.bc,bar,l \
+; RUN: -r=%t1.bc,main,plx \
+; RUN: -r=%t1.bc,__llvm_profile_filename,plx \
+; RUN: -r=%t1.bc,__llvm_profile_raw_version,plx \
+; RUN: -r=%t1.bc,__llvm_profile_sampling,pl \
+; RUN: -r=%t2.bc,bar,pl \
+; RUN: -r=%t2.bc,odd,pl \
+; RUN: -r=%t2.bc,even,pl \
+; RUN: -r=%t2.bc,__llvm_profile_filename,x \
+; RUN: -r=%t2.bc,__llvm_profile_raw_version,x \
+; RUN: -r=%t2.bc,__llvm_profile_sampling,
+; RUN: llvm-dis %t.1.4.opt.bc -o - | FileCheck %s --check-prefix=CSGEN
+
+; CSGEN: @__llvm_profile_sampling = thread_local global i16 0, comdat
+; CSGEN: @__profc_
+; CSGEN: @__profd_
+
+source_filename = "cspgo.c"
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+$__llvm_profile_filename = comdat any
+$__llvm_profile_raw_version = comdat any
+$__llvm_profile_sampling = comdat any
+ at __llvm_profile_filename = local_unnamed_addr constant [25 x i8] c"pass2/default_%m.profraw\00", comdat
+ at __llvm_profile_raw_version = local_unnamed_addr constant i64 216172782113783812, comdat
+ at __llvm_profile_sampling = thread_local global i16 0, comdat
+ at llvm.used = appending global [1 x i8*] [i8* bitcast (i64* @__llvm_profile_sampling to i8*)], section "llvm.metadata"
+
+define dso_local void @foo() #0 !prof !30 {
+entry:
+ br label %for.body
+
+for.body:
+ %i.06 = phi i32 [ 0, %entry ], [ %add1, %for.body ]
+ tail call void @bar(i32 %i.06) #3
+ %add = or i32 %i.06, 1
+ tail call void @bar(i32 %add) #3
+ %add1 = add nuw nsw i32 %i.06, 2
+ %cmp = icmp ult i32 %add1, 200000
+ br i1 %cmp, label %for.body, label %for.end, !prof !31
+
+for.end:
+ ret void
+}
+
+; CSGEN-LABEL: @foo
+; CSGEN: [[TMP0:%.*]] = load i16, ptr @__llvm_profile_sampling, align 2
+; CSGEN-NEXT: [[TMP1:%.*]] = icmp ult i16 [[TMP0]], 201
+; CSGEN-NEXT: br i1 [[TMP1]], label %{{.*}}, label %{{.*}}, !prof [[PROF:![0-9]+]]
+; CSGEN: [[TMP2:%.*]] = add i16 {{.*}}, 1
+; CSGEN-NEXT: store i16 [[TMP2]], ptr @__llvm_profile_sampling, align 2
+
+declare dso_local void @bar(i32)
+
+define dso_local i32 @main() !prof !30 {
+entry:
+ tail call void @foo()
+ ret i32 0
+}
+; CSGEN-LABEL: @main
+; CSGEN: [[TMP0:%.*]] = load i16, ptr @__llvm_profile_sampling, align 2
+; CSGEN-NEXT: [[TMP1:%.*]] = icmp ult i16 [[TMP0]], 201
+; CSGEN-NEXT: br i1 [[TMP1]], label %{{.*}}, label %{{.*}}, !prof [[PROF:![0-9]+]]
+; CSGEN: [[TMP2:%.*]] = add i16 {{.*}}, 1
+; CSGEN-NEXT: store i16 [[TMP2]], ptr @__llvm_profile_sampling, align 2
+
+attributes #0 = { "target-cpu"="x86-64" }
+
+!llvm.module.flags = !{!0, !1, !2}
+
+!0 = !{i32 1, !"wchar_size", i32 4}
+!1 = !{i32 1, !"EnableSplitLTOUnit", i32 0}
+!2 = !{i32 1, !"ProfileSummary", !3}
+!3 = !{!4, !5, !6, !7, !8, !9, !10, !11}
+!4 = !{!"ProfileFormat", !"InstrProf"}
+!5 = !{!"TotalCount", i64 500002}
+!6 = !{!"MaxCount", i64 200000}
+!7 = !{!"MaxInternalCount", i64 100000}
+!8 = !{!"MaxFunctionCount", i64 200000}
+!9 = !{!"NumCounts", i64 6}
+!10 = !{!"NumFunctions", i64 4}
+!11 = !{!"DetailedSummary", !12}
+!12 = !{!13, !14, !15, !16, !17, !18, !19, !20, !21, !22, !23, !24, !25, !26, !27, !28}
+!13 = !{i32 10000, i64 200000, i32 1}
+!14 = !{i32 100000, i64 200000, i32 1}
+!15 = !{i32 200000, i64 200000, i32 1}
+!16 = !{i32 300000, i64 200000, i32 1}
+!17 = !{i32 400000, i64 200000, i32 1}
+!18 = !{i32 500000, i64 100000, i32 4}
+!19 = !{i32 600000, i64 100000, i32 4}
+!20 = !{i32 700000, i64 100000, i32 4}
+!21 = !{i32 800000, i64 100000, i32 4}
+!22 = !{i32 900000, i64 100000, i32 4}
+!23 = !{i32 950000, i64 100000, i32 4}
+!24 = !{i32 990000, i64 100000, i32 4}
+!25 = !{i32 999000, i64 100000, i32 4}
+!26 = !{i32 999900, i64 100000, i32 4}
+!27 = !{i32 999990, i64 100000, i32 4}
+!28 = !{i32 999999, i64 1, i32 6}
+!30 = !{!"function_entry_count", i64 1}
+!31 = !{!"branch_weights", i32 100000, i32 1}
+
+; CSGEN: [[PROF]] = !{!"branch_weights", i32 200, i32 65336}
+
diff --git a/llvm/test/Transforms/PGOProfile/instrprof_burst_sampling_fast.ll b/llvm/test/Transforms/PGOProfile/instrprof_burst_sampling_fast.ll
new file mode 100644
index 0000000000000..dcc1e805ba6f6
--- /dev/null
+++ b/llvm/test/Transforms/PGOProfile/instrprof_burst_sampling_fast.ll
@@ -0,0 +1,47 @@
+; RUN: opt < %s --passes=instrprof --sampled-instrumentation -S | FileCheck %s --check-prefixes=SAMPLE-VAR,SAMPLE-CODE,SAMPLE-DURATION,SAMPLE-WEIGHT
+; RUN: opt < %s --passes=instrprof --sampled-instrumentation --sampled-instr-burst-duration=100 -S | FileCheck %s --check-prefixes=SAMPLE-VAR,SAMPLE-CODE,SAMPLE-DURATION100,SAMPLE-WEIGHT100
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+$__llvm_profile_raw_version = comdat any
+
+; SAMPLE-VAR: $__llvm_profile_sampling = comdat any
+
+ at __llvm_profile_raw_version = constant i64 72057594037927940, comdat
+ at __profn_f = private constant [1 x i8] c"f"
+
+; SAMPLE-VAR: @__llvm_profile_sampling = thread_local global i16 0, comdat
+; SAMPLE-VAR: @__profc_f = private global [1 x i64] zeroinitializer, section "__llvm_prf_cnts", comdat, align 8
+; SAMPLE-VAR: @__profd_f = private global { i64, i64, i64, i64, ptr, ptr, i32, [3 x i16], i32 } { i64 -3706093650706652785, i64 12884901887, i64 sub (i64 ptrtoint (ptr @__profc_f to i64), i64 ptrtoint (ptr @__profd_f to i64)), i64 0, ptr @f.local, ptr null, i32 1, [3 x i16] zeroinitializer, i32 0 }, section "__llvm_prf_data", comdat($__profc_f), align 8
+; SAMPLE-VAR: @__llvm_prf_nm = private constant {{.*}}, section "__llvm_prf_names", align 1
+; SAMPLE-VAR: @llvm.compiler.used = appending global [2 x ptr] [ptr @__llvm_profile_sampling, ptr @__profd_f], section "llvm.metadata"
+; SAMPLE-VAR: @llvm.used = appending global [1 x ptr] [ptr @__llvm_prf_nm], section "llvm.metadata"
+
+
+define void @f() {
+; SAMPLE-CODE-LABEL: @f(
+; SAMPLE-CODE: entry:
+; SAMPLE-CODE-NEXT: [[TMP0:%.*]] = load i16, ptr @__llvm_profile_sampling, align 2
+; SAMPLE-DURATION: [[TMP1:%.*]] = icmp ule i16 [[TMP0]], 200
+; SAMPLE-DURATION100: [[TMP1:%.*]] = icmp ule i16 [[TMP0]], 100
+; SAMPLE-CODE: br i1 [[TMP1]], label %[[TMP2:.*]], label %[[TMP4:.*]], !prof !0
+; SAMPLE-CODE: [[TMP2]]:
+; SAMPLE-CODE-NEXT: [[PGOCOUNT:%.*]] = load i64, ptr @__profc_f
+; SAMPLE-CODE-NEXT: [[TMP3:%.*]] = add i64 [[PGOCOUNT]], 1
+; SAMPLE-CODE-NEXT: store i64 [[TMP3]], ptr @__profc_f
+; SAMPLE-CODE-NEXT: br label %[[TMP4]]
+; SAMPLE-CODE: [[TMP4]]:
+; SAMPLE-CODE-NEXT: [[TMP5:%.*]] = add i16 [[TMP0]], 1
+; SAMPLE-CODE-NEXT: store i16 [[TMP5]], ptr @__llvm_profile_sampling, align 2
+; SAMPLE-CODE-NEXT: ret void
+;
+entry:
+ call void @llvm.instrprof.increment(i8* getelementptr inbounds ([1 x i8], [1 x i8]* @__profn_f, i32 0, i32 0), i64 12884901887, i32 1, i32 0)
+ ret void
+}
+
+; SAMPLE-WEIGHT: !0 = !{!"branch_weights", i32 200, i32 65336}
+; SAMPLE-WEIGHT100: !0 = !{!"branch_weights", i32 100, i32 65436}
+
+declare void @llvm.instrprof.increment(i8*, i64, i32, i32)
diff --git a/llvm/test/Transforms/PGOProfile/instrprof_burst_sampling_full.ll b/llvm/test/Transforms/PGOProfile/instrprof_burst_sampling_full.ll
new file mode 100644
index 0000000000000..57d1a0cd33fbe
--- /dev/null
+++ b/llvm/test/Transforms/PGOProfile/instrprof_burst_sampling_full.ll
@@ -0,0 +1,45 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt < %s --passes=instrprof -sampled-instrumentation --sampled-instr-period=1009 --sampled-instr-burst-duration=32 -S | FileCheck %s
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+$__llvm_profile_raw_version = comdat any
+
+ at __llvm_profile_raw_version = constant i64 72057594037927940, comdat
+ at __profn_f = private constant [1 x i8] c"f"
+
+define void @f() {
+; CHECK-LABEL: define void @f() {
+; CHECK-NEXT: [[ENTRY:.*:]]
+; CHECK-NEXT: [[TMP0:%.*]] = load i16, ptr @__llvm_profile_sampling, align 2
+; CHECK-NEXT: [[TMP1:%.*]] = icmp ule i16 [[TMP0]], 32
+; CHECK-NEXT: br i1 [[TMP1]], label %[[BB2:.*]], label %[[BB4:.*]], !prof [[PROF0:![0-9]+]]
+; CHECK: [[BB2]]:
+; CHECK-NEXT: [[PGOCOUNT:%.*]] = load i64, ptr @__profc_f, align 8
+; CHECK-NEXT: [[TMP3:%.*]] = add i64 [[PGOCOUNT]], 1
+; CHECK-NEXT: store i64 [[TMP3]], ptr @__profc_f, align 8
+; CHECK-NEXT: br label %[[BB4]]
+; CHECK: [[BB4]]:
+; CHECK-NEXT: [[TMP5:%.*]] = add i16 [[TMP0]], 1
+; CHECK-NEXT: [[TMP6:%.*]] = icmp uge i16 [[TMP5]], 1009
+; CHECK-NEXT: br i1 [[TMP6]], label %[[BB7:.*]], label %[[BB8:.*]], !prof [[PROF1:![0-9]+]]
+; CHECK: [[BB7]]:
+; CHECK-NEXT: store i16 0, ptr @__llvm_profile_sampling, align 2
+; CHECK-NEXT: br label %[[BB9:.*]]
+; CHECK: [[BB8]]:
+; CHECK-NEXT: store i16 [[TMP5]], ptr @__llvm_profile_sampling, align 2
+; CHECK-NEXT: br label %[[BB9]]
+; CHECK: [[BB9]]:
+; CHECK-NEXT: ret void
+;
+entry:
+ call void @llvm.instrprof.increment(i8* getelementptr inbounds ([1 x i8], [1 x i8]* @__profn_f, i32 0, i32 0), i64 12884901887, i32 1, i32 0)
+ ret void
+}
+
+declare void @llvm.instrprof.increment(i8*, i64, i32, i32)
+;.
+; CHECK: [[PROF0]] = !{!"branch_weights", i32 32, i32 978}
+; CHECK: [[PROF1]] = !{!"branch_weights", i32 1, i32 1009}
+;.
diff --git a/llvm/test/Transforms/PGOProfile/instrprof_burst_sampling_full_intsize.ll b/llvm/test/Transforms/PGOProfile/instrprof_burst_sampling_full_intsize.ll
new file mode 100644
index 0000000000000..1ad889524bc6a
--- /dev/null
+++ b/llvm/test/Transforms/PGOProfile/instrprof_burst_sampling_full_intsize.ll
@@ -0,0 +1,45 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt < %s --passes=instrprof --sampled-instrumentation --sampled-instr-period=1000019 --sampled-instr-burst-duration=3000 -S | FileCheck %s
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+$__llvm_profile_raw_version = comdat any
+
+ at __llvm_profile_raw_version = constant i64 72057594037927940, comdat
+ at __profn_f = private constant [1 x i8] c"f"
+
+define void @f() {
+; CHECK-LABEL: define void @f() {
+; CHECK-NEXT: [[ENTRY:.*:]]
+; CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr @__llvm_profile_sampling, align 4
+; CHECK-NEXT: [[TMP1:%.*]] = icmp ule i32 [[TMP0]], 3000
+; CHECK-NEXT: br i1 [[TMP1]], label %[[BB2:.*]], label %[[BB4:.*]], !prof [[PROF0:![0-9]+]]
+; CHECK: [[BB2]]:
+; CHECK-NEXT: [[PGOCOUNT:%.*]] = load i64, ptr @__profc_f, align 8
+; CHECK-NEXT: [[TMP3:%.*]] = add i64 [[PGOCOUNT]], 1
+; CHECK-NEXT: store i64 [[TMP3]], ptr @__profc_f, align 8
+; CHECK-NEXT: br label %[[BB4]]
+; CHECK: [[BB4]]:
+; CHECK-NEXT: [[TMP5:%.*]] = add i32 [[TMP0]], 1
+; CHECK-NEXT: [[TMP6:%.*]] = icmp uge i32 [[TMP5]], 1000019
+; CHECK-NEXT: br i1 [[TMP6]], label %[[BB7:.*]], label %[[BB8:.*]], !prof [[PROF1:![0-9]+]]
+; CHECK: [[BB7]]:
+; CHECK-NEXT: store i32 0, ptr @__llvm_profile_sampling, align 4
+; CHECK-NEXT: br label %[[BB9:.*]]
+; CHECK: [[BB8]]:
+; CHECK-NEXT: store i32 [[TMP5]], ptr @__llvm_profile_sampling, align 4
+; CHECK-NEXT: br label %[[BB9]]
+; CHECK: [[BB9]]:
+; CHECK-NEXT: ret void
+;
+entry:
+ call void @llvm.instrprof.increment(i8* getelementptr inbounds ([1 x i8], [1 x i8]* @__profn_f, i32 0, i32 0), i64 12884901887, i32 1, i32 0)
+ ret void
+}
+
+declare void @llvm.instrprof.increment(i8*, i64, i32, i32)
+;.
+; CHECK: [[PROF0]] = !{!"branch_weights", i32 3000, i32 997020}
+; CHECK: [[PROF1]] = !{!"branch_weights", i32 1, i32 1000019}
+;.
diff --git a/llvm/test/Transforms/PGOProfile/instrprof_simple_sampling.ll b/llvm/test/Transforms/PGOProfile/instrprof_simple_sampling.ll
new file mode 100644
index 0000000000000..8e846bbf1d982
--- /dev/null
+++ b/llvm/test/Transforms/PGOProfile/instrprof_simple_sampling.ll
@@ -0,0 +1,60 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt < %s --passes=instrprof --sampled-instrumentation --sampled-instr-burst-duration=1 --sampled-instr-period=1009 -S | FileCheck %s --check-prefix=PERIOD1009
+; RUN: opt < %s --passes=instrprof --sampled-instrumentation --sampled-instr-burst-duration=1 -S | FileCheck %s --check-prefix=DEFAULTPERIOD
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+$__llvm_profile_raw_version = comdat any
+
+ at __llvm_profile_raw_version = constant i64 72057594037927940, comdat
+ at __profn_f = private constant [1 x i8] c"f"
+
+define void @f() {
+; PERIOD1009-LABEL: define void @f() {
+; PERIOD1009-NEXT: [[ENTRY:.*:]]
+; PERIOD1009-NEXT: [[TMP0:%.*]] = load i16, ptr @__llvm_profile_sampling, align 2
+; PERIOD1009-NEXT: [[TMP1:%.*]] = add i16 [[TMP0]], 1
+; PERIOD1009-NEXT: [[TMP2:%.*]] = icmp uge i16 [[TMP1]], 1009
+; PERIOD1009-NEXT: br i1 [[TMP2]], label %[[BB3:.*]], label %[[BB5:.*]], !prof [[PROF0:![0-9]+]]
+; PERIOD1009: [[BB3]]:
+; PERIOD1009-NEXT: [[PGOCOUNT:%.*]] = load i64, ptr @__profc_f, align 8
+; PERIOD1009-NEXT: [[TMP4:%.*]] = add i64 [[PGOCOUNT]], 1
+; PERIOD1009-NEXT: store i64 [[TMP4]], ptr @__profc_f, align 8
+; PERIOD1009-NEXT: store i16 0, ptr @__llvm_profile_sampling, align 2
+; PERIOD1009-NEXT: br label %[[BB6:.*]]
+; PERIOD1009: [[BB5]]:
+; PERIOD1009-NEXT: store i16 [[TMP1]], ptr @__llvm_profile_sampling, align 2
+; PERIOD1009-NEXT: br label %[[BB6]]
+; PERIOD1009: [[BB6]]:
+; PERIOD1009-NEXT: ret void
+;
+; DEFAULTPERIOD-LABEL: define void @f() {
+; DEFAULTPERIOD-NEXT: [[ENTRY:.*:]]
+; DEFAULTPERIOD-NEXT: [[TMP0:%.*]] = load i16, ptr @__llvm_profile_sampling, align 2
+; DEFAULTPERIOD-NEXT: [[TMP1:%.*]] = add i16 [[TMP0]], 1
+; DEFAULTPERIOD-NEXT: [[TMP2:%.*]] = icmp uge i16 [[TMP1]], -1
+; DEFAULTPERIOD-NEXT: br i1 [[TMP2]], label %[[BB3:.*]], label %[[BB5:.*]], !prof [[PROF0:![0-9]+]]
+; DEFAULTPERIOD: [[BB3]]:
+; DEFAULTPERIOD-NEXT: [[PGOCOUNT:%.*]] = load i64, ptr @__profc_f, align 8
+; DEFAULTPERIOD-NEXT: [[TMP4:%.*]] = add i64 [[PGOCOUNT]], 1
+; DEFAULTPERIOD-NEXT: store i64 [[TMP4]], ptr @__profc_f, align 8
+; DEFAULTPERIOD-NEXT: store i16 0, ptr @__llvm_profile_sampling, align 2
+; DEFAULTPERIOD-NEXT: br label %[[BB6:.*]]
+; DEFAULTPERIOD: [[BB5]]:
+; DEFAULTPERIOD-NEXT: store i16 [[TMP1]], ptr @__llvm_profile_sampling, align 2
+; DEFAULTPERIOD-NEXT: br label %[[BB6]]
+; DEFAULTPERIOD: [[BB6]]:
+; DEFAULTPERIOD-NEXT: ret void
+;
+entry:
+ call void @llvm.instrprof.increment(i8* getelementptr inbounds ([1 x i8], [1 x i8]* @__profn_f, i32 0, i32 0), i64 12884901887, i32 1, i32 0)
+ ret void
+}
+
+declare void @llvm.instrprof.increment(i8*, i64, i32, i32)
+;.
+; PERIOD1009: [[PROF0]] = !{!"branch_weights", i32 1, i32 1009}
+;.
+; DEFAULTPERIOD: [[PROF0]] = !{!"branch_weights", i32 1, i32 65535}
+;.
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