View file
51 llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -898,6 +898,11 @@ static GlobalValueSummary::GVFlags getDecodedGVSummaryFlags(uint64_t RawFlags,
return GlobalValueSummary::GVFlags(Linkage, NotEligibleToImport, Live, Local);
}

// Decode the flags for GlobalVariable in the summary
static GlobalVarSummary::GVarFlags getDecodedGVarFlags(uint64_t RawFlags) {
return GlobalVarSummary::GVarFlags((RawFlags & 0x1) ? true : false);
}

static GlobalValue::VisibilityTypes getDecodedVisibility(unsigned Val) {
switch (Val) {
default: // Map unknown visibilities to default.
@@ -5219,6 +5224,12 @@ static void parseTypeIdSummaryRecord(ArrayRef<uint64_t> Record,
parseWholeProgramDevirtResolution(Record, Strtab, Slot, TypeId);
}

static void setImmutableRefs(std::vector<ValueInfo> &Refs, unsigned Count) {
// Read-only refs are in the end of the refs list.
for (unsigned RefNo = Refs.size() - Count; RefNo < Refs.size(); ++RefNo)
Refs[RefNo].setReadOnly();
}

// Eagerly parse the entire summary block. This populates the GlobalValueSummary
// objects in the index.
Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
@@ -5236,9 +5247,9 @@ Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
}
const uint64_t Version = Record[0];
const bool IsOldProfileFormat = Version == 1;
if (Version < 1 || Version > 4)
if (Version < 1 || Version > 5)
return error("Invalid summary version " + Twine(Version) +
", 1, 2, 3 or 4 expected");
", 1, 2, 3, 4 or 5 expected");
Record.clear();

// Keep around the last seen summary to be used when we see an optional
@@ -5317,11 +5328,16 @@ Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
unsigned InstCount = Record[2];
uint64_t RawFunFlags = 0;
unsigned NumRefs = Record[3];
unsigned NumImmutableRefs = 0;
int RefListStartIndex = 4;
if (Version >= 4) {
RawFunFlags = Record[3];
NumRefs = Record[4];
RefListStartIndex = 5;
if (Version >= 5) {
NumImmutableRefs = Record[5];
RefListStartIndex = 6;
}
}

auto Flags = getDecodedGVSummaryFlags(RawFlags, Version);
@@ -5340,6 +5356,7 @@ Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
std::vector<FunctionSummary::EdgeTy> Calls = makeCallList(
ArrayRef<uint64_t>(Record).slice(CallGraphEdgeStartIndex),
IsOldProfileFormat, HasProfile, HasRelBF);
setImmutableRefs(Refs, NumImmutableRefs);
auto FS = llvm::make_unique<FunctionSummary>(
Flags, InstCount, getDecodedFFlags(RawFunFlags), std::move(Refs),
std::move(Calls), std::move(PendingTypeTests),
@@ -5388,14 +5405,21 @@ Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
TheIndex.addGlobalValueSummary(GUID.first, std::move(AS));
break;
}
// FS_PERMODULE_GLOBALVAR_INIT_REFS: [valueid, flags, n x valueid]
// FS_PERMODULE_GLOBALVAR_INIT_REFS: [valueid, flags, varflags, n x valueid]
case bitc::FS_PERMODULE_GLOBALVAR_INIT_REFS: {
unsigned ValueID = Record[0];
uint64_t RawFlags = Record[1];
unsigned RefArrayStart = 2;
GlobalVarSummary::GVarFlags GVF;
auto Flags = getDecodedGVSummaryFlags(RawFlags, Version);
if (Version >= 5) {
GVF = getDecodedGVarFlags(Record[2]);
RefArrayStart = 3;
}
std::vector<ValueInfo> Refs =
makeRefList(ArrayRef<uint64_t>(Record).slice(2));
auto FS = llvm::make_unique<GlobalVarSummary>(Flags, std::move(Refs));
makeRefList(ArrayRef<uint64_t>(Record).slice(RefArrayStart));
auto FS =
llvm::make_unique<GlobalVarSummary>(Flags, GVF, std::move(Refs));
FS->setModulePath(getThisModule()->first());
auto GUID = getValueInfoFromValueId(ValueID);
FS->setOriginalName(GUID.second);
@@ -5414,12 +5438,17 @@ Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
unsigned InstCount = Record[3];
uint64_t RawFunFlags = 0;
unsigned NumRefs = Record[4];
unsigned NumImmutableRefs = 0;
int RefListStartIndex = 5;

if (Version >= 4) {
RawFunFlags = Record[4];
NumRefs = Record[5];
RefListStartIndex = 6;
if (Version >= 5) {
NumImmutableRefs = Record[6];
RefListStartIndex = 7;
}
}

auto Flags = getDecodedGVSummaryFlags(RawFlags, Version);
@@ -5433,6 +5462,7 @@ Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
ArrayRef<uint64_t>(Record).slice(CallGraphEdgeStartIndex),
IsOldProfileFormat, HasProfile, false);
ValueInfo VI = getValueInfoFromValueId(ValueID).first;
setImmutableRefs(Refs, NumImmutableRefs);
auto FS = llvm::make_unique<FunctionSummary>(
Flags, InstCount, getDecodedFFlags(RawFunFlags), std::move(Refs),
std::move(Edges), std::move(PendingTypeTests),
@@ -5481,10 +5511,17 @@ Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
unsigned ValueID = Record[0];
uint64_t ModuleId = Record[1];
uint64_t RawFlags = Record[2];
unsigned RefArrayStart = 3;
GlobalVarSummary::GVarFlags GVF;
auto Flags = getDecodedGVSummaryFlags(RawFlags, Version);
if (Version >= 5) {
GVF = getDecodedGVarFlags(Record[3]);
RefArrayStart = 4;
}
std::vector<ValueInfo> Refs =
makeRefList(ArrayRef<uint64_t>(Record).slice(3));
auto FS = llvm::make_unique<GlobalVarSummary>(Flags, std::move(Refs));
makeRefList(ArrayRef<uint64_t>(Record).slice(RefArrayStart));
auto FS =
llvm::make_unique<GlobalVarSummary>(Flags, GVF, std::move(Refs));
LastSeenSummary = FS.get();
FS->setModulePath(ModuleIdMap[ModuleId]);
ValueInfo VI = getValueInfoFromValueId(ValueID).first;
View file
22 llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -1000,6 +1000,11 @@ static uint64_t getEncodedGVSummaryFlags(GlobalValueSummary::GVFlags Flags) {
return RawFlags;
}

static uint64_t getEncodedGVarFlags(GlobalVarSummary::GVarFlags Flags) {
uint64_t RawFlags = Flags.ReadOnly;
return RawFlags;
}

static unsigned getEncodedVisibility(const GlobalValue &GV) {
switch (GV.getVisibility()) {
case GlobalValue::DefaultVisibility: return 0;
@@ -3539,6 +3544,7 @@ void ModuleBitcodeWriterBase::writePerModuleFunctionSummaryRecord(
NameVals.push_back(FS->instCount());
NameVals.push_back(getEncodedFFlags(FS->fflags()));
NameVals.push_back(FS->refs().size());
NameVals.push_back(FS->immutableRefCount());

for (auto &RI : FS->refs())
NameVals.push_back(VE.getValueID(RI.getValue()));
@@ -3580,6 +3586,7 @@ void ModuleBitcodeWriterBase::writeModuleLevelReferences(
NameVals.push_back(VE.getValueID(&V));
GlobalVarSummary *VS = cast<GlobalVarSummary>(Summary);
NameVals.push_back(getEncodedGVSummaryFlags(VS->flags()));
NameVals.push_back(getEncodedGVarFlags(VS->varflags()));

unsigned SizeBeforeRefs = NameVals.size();
for (auto &RI : VS->refs())
@@ -3596,7 +3603,7 @@ void ModuleBitcodeWriterBase::writeModuleLevelReferences(
// Current version for the summary.
// This is bumped whenever we introduce changes in the way some record are
// interpreted, like flags for instance.
static const uint64_t INDEX_VERSION = 4;
static const uint64_t INDEX_VERSION = 5;

/// Emit the per-module summary section alongside the rest of
/// the module's bitcode.
@@ -3631,6 +3638,7 @@ void ModuleBitcodeWriterBase::writePerModuleGlobalValueSummary() {
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // instcount
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // fflags
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // immutablerefcnt
// numrefs x valueid, n x (valueid, hotness)
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
@@ -3647,6 +3655,7 @@ void ModuleBitcodeWriterBase::writePerModuleGlobalValueSummary() {
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // instcount
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // fflags
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // immutablerefcnt
// numrefs x valueid, n x (valueid [, rel_block_freq])
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
@@ -3741,6 +3750,7 @@ void IndexBitcodeWriter::writeCombinedGlobalValueSummary() {
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // instcount
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // fflags
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // immutablerefcnt
// numrefs x valueid, n x (valueid)
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
@@ -3755,6 +3765,7 @@ void IndexBitcodeWriter::writeCombinedGlobalValueSummary() {
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // instcount
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // fflags
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // immutablerefcnt
// numrefs x valueid, n x (valueid, hotness)
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
@@ -3827,6 +3838,7 @@ void IndexBitcodeWriter::writeCombinedGlobalValueSummary() {
NameVals.push_back(*ValueId);
NameVals.push_back(Index.getModuleId(VS->modulePath()));
NameVals.push_back(getEncodedGVSummaryFlags(VS->flags()));
NameVals.push_back(getEncodedGVarFlags(VS->varflags()));
for (auto &RI : VS->refs()) {
auto RefValueId = getValueId(RI.getGUID());
if (!RefValueId)
@@ -3852,17 +3864,21 @@ void IndexBitcodeWriter::writeCombinedGlobalValueSummary() {
NameVals.push_back(FS->instCount());
NameVals.push_back(getEncodedFFlags(FS->fflags()));
// Fill in below
NameVals.push_back(0);
NameVals.push_back(0); // numrefs
NameVals.push_back(0); // immutablerefcnt

unsigned Count = 0;
unsigned Count = 0, ImmutableRefCnt = 0;
for (auto &RI : FS->refs()) {
auto RefValueId = getValueId(RI.getGUID());
if (!RefValueId)
continue;
NameVals.push_back(*RefValueId);
if (RI.isReadOnly())
ImmutableRefCnt++;
Count++;
}
NameVals[5] = Count;
NameVals[6] = ImmutableRefCnt;

bool HasProfileData = false;
for (auto &EI : FS->calls()) {
View file
107 llvm/lib/IR/ModuleSummaryIndex.cpp
@@ -30,6 +30,17 @@ bool ValueInfo::isDSOLocal() const {
});
}

// Gets the number of immutable refs in RefEdgeList
unsigned FunctionSummary::immutableRefCount() const {
// Here we take advantage of having all readonly references
// located in the end of the RefEdgeList.
auto Refs = refs();
unsigned ImmutableRefCnt = 0;
for (int I = Refs.size() - 1; I >= 0 && Refs[I].isReadOnly(); --I)
ImmutableRefCnt++;
return ImmutableRefCnt;
}

// Collect for the given module the list of function it defines
// (GUID -> Summary).
void ModuleSummaryIndex::collectDefinedFunctionsForModule(
@@ -84,6 +95,73 @@ bool ModuleSummaryIndex::isGUIDLive(GlobalValue::GUID GUID) const {
return false;
}

static void propagateConstantsToRefs(GlobalValueSummary *S) {
// If reference is not readonly then referenced summary is not
// readonly either. Note that:
// - All references from GlobalVarSummary are conservatively considered as
// not readonly. Tracking them properly requires more complex analysis
// then we have now.
//
// - AliasSummary objects have no refs at all so this function is a no-op
// for them.
for (auto &VI : S->refs()) {
if (VI.isReadOnly()) {
// We only mark refs as readonly when computing function summaries on
// analysis phase.
assert(isa<FunctionSummary>(S));
continue;
}
for (auto &Ref : VI.getSummaryList())
// If references to alias is not readonly then aliasee is not readonly
if (auto *GVS = dyn_cast<GlobalVarSummary>(Ref->getBaseObject()))
GVS->setReadOnly(false);
}
}

// Do the constant propagation in combined index.
// The goal of constant propagation is internalization of readonly
// variables. To determine which variables are readonly and which
// are not we take following steps:
// - During analysis we speculatively assign readonly attribute to
// all variables which can be internalized. When computing function
// summary we also assign readonly attribute to a reference if
// function doesn't modify referenced variable.
//
// - After computing dead symbols in combined index we do the constant
// propagation. During this step we clear readonly attribute from
// all variables which:
// a. are dead, preserved or can't be imported
// b. referenced by any global variable initializer
// c. referenced by a function and reference is not readonly
//
// Internalization itself happens in the backend after import is finished
// See internalizeImmutableGVs.
void ModuleSummaryIndex::propagateConstants(
const DenseSet<GlobalValue::GUID> &GUIDPreservedSymbols) {
for (auto &P : *this)
for (auto &S : P.second.SummaryList) {
if (!isGlobalValueLive(S.get()))
// We don't examine references from dead objects
continue;

// Global variable can't be marked read only if it is not eligible
// to import since we need to ensure that all external references
// get a local (imported) copy. It also can't be marked read only
// if it or any alias (since alias points to the same memory) are
// preserved or notEligibleToImport, since either of those means
// there could be writes that are not visible (because preserved
// means it could have external to DSO writes, and notEligibleToImport
// means it could have writes via inline assembly leading it to be
// in the @llvm.*used).
if (auto *GVS = dyn_cast<GlobalVarSummary>(S->getBaseObject()))
// Here we intentionally pass S.get() not GVS, because S could be
// an alias.
if (!canImportGlobalVar(S.get()) || GUIDPreservedSymbols.count(P.first))
GVS->setReadOnly(false);
propagateConstantsToRefs(S.get());
}
}

// TODO: write a graphviz dumper for SCCs (see ModuleSummaryIndex::exportToDot)
// then delete this function and update its tests
LLVM_DUMP_METHOD
@@ -108,6 +186,7 @@ namespace {
struct Attributes {
void add(const Twine &Name, const Twine &Value,
const Twine &Comment = Twine());
void addComment(const Twine &Comment);
std::string getAsString() const;

std::vector<std::string> Attrs;
@@ -129,6 +208,10 @@ void Attributes::add(const Twine &Name, const Twine &Value,
A += Value.str();
A += "\"";
Attrs.push_back(A);
addComment(Comment);
}

void Attributes::addComment(const Twine &Comment) {
if (!Comment.isTriviallyEmpty()) {
if (Comments.empty())
Comments = " // ";
@@ -237,6 +320,12 @@ static void defineExternalNode(raw_ostream &OS, const char *Pfx,
OS << "\"]; // defined externally\n";
}

static bool hasReadOnlyFlag(const GlobalValueSummary *S) {
if (auto *GVS = dyn_cast<GlobalVarSummary>(S))
return GVS->isReadOnly();
return false;
}

void ModuleSummaryIndex::exportToDot(raw_ostream &OS) const {
std::vector<Edge> CrossModuleEdges;
DenseMap<GlobalValue::GUID, std::vector<uint64_t>> NodeMap;
@@ -252,13 +341,17 @@ void ModuleSummaryIndex::exportToDot(raw_ostream &OS) const {
};

auto DrawEdge = [&](const char *Pfx, uint64_t SrcMod, GlobalValue::GUID SrcId,
uint64_t DstMod, GlobalValue::GUID DstId, int TypeOrHotness) {
// 0 corresponds to alias edge, 1 to ref edge, 2 to call with unknown
// hotness, ...
TypeOrHotness += 2;
uint64_t DstMod, GlobalValue::GUID DstId,
int TypeOrHotness) {
// 0 - alias
// 1 - reference
// 2 - constant reference
// Other value: (hotness - 3).
TypeOrHotness += 3;
static const char *EdgeAttrs[] = {
" [style=dotted]; // alias",
" [style=dashed]; // ref",
" [style=dashed,color=forestgreen]; // const-ref",
" // call (hotness : Unknown)",
" [color=blue]; // call (hotness : Cold)",
" // call (hotness : None)",
@@ -301,6 +394,8 @@ void ModuleSummaryIndex::exportToDot(raw_ostream &OS) const {
A.add("shape", "box");
} else {
A.add("shape", "Mrecord", "variable");
if (Flags.Live && hasReadOnlyFlag(SummaryIt.second))
A.addComment("immutable");
}

auto VI = getValueInfo(SummaryIt.first);
@@ -318,7 +413,7 @@ void ModuleSummaryIndex::exportToDot(raw_ostream &OS) const {
for (auto &SummaryIt : GVSMap) {
auto *GVS = SummaryIt.second;
for (auto &R : GVS->refs())
Draw(SummaryIt.first, R.getGUID(), -1);
Draw(SummaryIt.first, R.getGUID(), R.isReadOnly() ? -1 : -2);

if (auto *AS = dyn_cast_or_null<AliasSummary>(SummaryIt.second)) {
GlobalValue::GUID AliaseeId;
@@ -331,7 +426,7 @@ void ModuleSummaryIndex::exportToDot(raw_ostream &OS) const {
AliaseeId = AliaseeOrigId;
}

Draw(SummaryIt.first, AliaseeId, -2);
Draw(SummaryIt.first, AliaseeId, -3);
continue;
}

View file
5 llvm/lib/LTO/LTO.cpp
@@ -187,6 +187,8 @@ static void computeCacheKey(
AddUnsigned(VI.isDSOLocal());
AddUsedCfiGlobal(VI.getGUID());
}
if (auto *GVS = dyn_cast<GlobalVarSummary>(GS))
AddUnsigned(GVS->isReadOnly());
if (auto *FS = dyn_cast<FunctionSummary>(GS)) {
for (auto &TT : FS->type_tests())
UsedTypeIds.insert(TT);
@@ -809,7 +811,8 @@ Error LTO::run(AddStreamFn AddStream, NativeObjectCache Cache) {
return PrevailingType::Unknown;
return It->second;
};
computeDeadSymbols(ThinLTO.CombinedIndex, GUIDPreservedSymbols, isPrevailing);
computeDeadSymbolsWithConstProp(ThinLTO.CombinedIndex, GUIDPreservedSymbols,
isPrevailing, Conf.OptLevel > 0);

// Setup output file to emit statistics.
std::unique_ptr<ToolOutputFile> StatsFile = nullptr;
View file
19 llvm/lib/LTO/ThinLTOCodeGenerator.cpp
@@ -298,7 +298,7 @@ class ModuleCacheEntry {
const FunctionImporter::ImportMapTy &ImportList,
const FunctionImporter::ExportSetTy &ExportList,
const std::map<GlobalValue::GUID, GlobalValue::LinkageTypes> &ResolvedODR,
const GVSummaryMapTy &DefinedFunctions,
const GVSummaryMapTy &DefinedGVSummaries,
const DenseSet<GlobalValue::GUID> &PreservedSymbols, unsigned OptLevel,
bool Freestanding, const TargetMachineBuilder &TMBuilder) {
if (CachePath.empty())
@@ -368,6 +368,10 @@ class ModuleCacheEntry {
for (auto &Entry : ImportList) {
auto ModHash = Index.getModuleHash(Entry.first());
Hasher.update(ArrayRef<uint8_t>((uint8_t *)&ModHash[0], sizeof(ModHash)));
for (auto Guid : Entry.second)
if (auto *GVS = dyn_cast<GlobalVarSummary>(
Index.getGlobalValueSummary(Guid, false)))
AddUnsigned(GVS->isReadOnly());
}

// Include the hash for the resolved ODR.
@@ -380,11 +384,15 @@ class ModuleCacheEntry {

// Include the hash for the preserved symbols.
for (auto &Entry : PreservedSymbols) {
if (DefinedFunctions.count(Entry))
if (DefinedGVSummaries.count(Entry))
Hasher.update(
ArrayRef<uint8_t>((const uint8_t *)&Entry, sizeof(GlobalValue::GUID)));
}

for (auto &Entry : DefinedGVSummaries)
if (auto *GVS = dyn_cast<GlobalVarSummary>(Entry.second))
AddUnsigned(GVS->isReadOnly());

// This choice of file name allows the cache to be pruned (see pruneCache()
// in include/llvm/Support/CachePruning.h).
sys::path::append(EntryPath, CachePath,
@@ -646,7 +654,8 @@ static void computeDeadSymbolsInIndex(
auto isPrevailing = [&](GlobalValue::GUID G) {
return PrevailingType::Unknown;
};
computeDeadSymbols(Index, GUIDPreservedSymbols, isPrevailing);
computeDeadSymbolsWithConstProp(Index, GUIDPreservedSymbols, isPrevailing,
/* ImportEnabled = */ true);
}

/**
@@ -983,13 +992,13 @@ void ThinLTOCodeGenerator::run() {
auto ModuleIdentifier = ModuleBuffer.getBufferIdentifier();
auto &ExportList = ExportLists[ModuleIdentifier];

auto &DefinedFunctions = ModuleToDefinedGVSummaries[ModuleIdentifier];
auto &DefinedGVSummaries = ModuleToDefinedGVSummaries[ModuleIdentifier];

// The module may be cached, this helps handling it.
ModuleCacheEntry CacheEntry(CacheOptions.Path, *Index, ModuleIdentifier,
ImportLists[ModuleIdentifier], ExportList,
ResolvedODR[ModuleIdentifier],
DefinedFunctions, GUIDPreservedSymbols,
DefinedGVSummaries, GUIDPreservedSymbols,
OptLevel, Freestanding, TMBuilder);
auto CacheEntryPath = CacheEntry.getEntryPath();

View file
5 llvm/lib/Linker/IRMover.cpp
@@ -1062,11 +1062,6 @@ void IRLinker::prepareCompileUnitsForImport() {
ValueMap.MD()[CU->getRawEnumTypes()].reset(nullptr);
ValueMap.MD()[CU->getRawMacros()].reset(nullptr);
ValueMap.MD()[CU->getRawRetainedTypes()].reset(nullptr);
// We import global variables only temporarily in order for instcombine
// and globalopt to perform constant folding and static constructor
// evaluation. After that elim-avail-extern will covert imported globals
// back to declarations, so we don't need debug info for them.
ValueMap.MD()[CU->getRawGlobalVariables()].reset(nullptr);

// Imported entities only need to be mapped in if they have local
// scope, as those might correspond to an imported entity inside a
View file
39 llvm/lib/Transforms/IPO/FunctionImport.cpp
@@ -294,10 +294,8 @@ static void computeImportForReferencedGlobals(
LLVM_DEBUG(dbgs() << " ref -> " << VI << "\n");

for (auto &RefSummary : VI.getSummaryList())
if (RefSummary->getSummaryKind() == GlobalValueSummary::GlobalVarKind &&
!RefSummary->notEligibleToImport() &&
!GlobalValue::isInterposableLinkage(RefSummary->linkage()) &&
RefSummary->refs().empty()) {
if (isa<GlobalVarSummary>(RefSummary.get()) &&
canImportGlobalVar(RefSummary.get())) {
auto ILI = ImportList[RefSummary->modulePath()].insert(VI.getGUID());
// Only update stat if we haven't already imported this variable.
if (ILI.second)
@@ -824,6 +822,25 @@ void llvm::computeDeadSymbols(
NumLiveSymbols += LiveSymbols;
}

// Compute dead symbols and propagate constants in combined index.
void llvm::computeDeadSymbolsWithConstProp(
ModuleSummaryIndex &Index,
const DenseSet<GlobalValue::GUID> &GUIDPreservedSymbols,
function_ref<PrevailingType(GlobalValue::GUID)> isPrevailing,
bool ImportEnabled) {
computeDeadSymbols(Index, GUIDPreservedSymbols, isPrevailing);
if (ImportEnabled) {
Index.propagateConstants(GUIDPreservedSymbols);
} else {
// If import is disabled we should drop read-only attribute
// from all summaries to prevent internalization.
for (auto &P : Index)
for (auto &S : P.second.SummaryList)
if (auto *GVS = dyn_cast<GlobalVarSummary>(S.get()))
GVS->setReadOnly(false);
}
}

/// Compute the set of summaries needed for a ThinLTO backend compilation of
/// \p ModulePath.
void llvm::gatherImportedSummariesForModule(
@@ -1020,6 +1037,18 @@ static Function *replaceAliasWithAliasee(Module *SrcModule, GlobalAlias *GA) {
return NewFn;
}

// Internalize values that we marked with specific attribute
// in processGlobalForThinLTO.
static void internalizeImmutableGVs(Module &M) {
for (auto &GV : M.globals())
// Skip GVs which have been converted to declarations
// by dropDeadSymbols.
if (!GV.isDeclaration() && GV.hasAttribute("thinlto-internalize")) {
GV.setLinkage(GlobalValue::InternalLinkage);
GV.setVisibility(GlobalValue::DefaultVisibility);
}
}

// Automatically import functions in Module \p DestModule based on the summaries
// index.
Expected<bool> FunctionImporter::importFunctions(
@@ -1143,6 +1172,8 @@ Expected<bool> FunctionImporter::importFunctions(
NumImportedModules++;
}

internalizeImmutableGVs(DestModule);

NumImportedFunctions += (ImportedCount - ImportedGVCount);
NumImportedGlobalVars += ImportedGVCount;

View file
21 llvm/lib/Transforms/Utils/FunctionImportUtils.cpp
@@ -204,15 +204,32 @@ void FunctionImportGlobalProcessing::processGlobalForThinLTO(GlobalValue &GV) {

// Check the summaries to see if the symbol gets resolved to a known local
// definition.
ValueInfo VI;
if (GV.hasName()) {
ValueInfo VI = ImportIndex.getValueInfo(GV.getGUID());
VI = ImportIndex.getValueInfo(GV.getGUID());
if (VI && VI.isDSOLocal()) {
GV.setDSOLocal(true);
if (GV.hasDLLImportStorageClass())
GV.setDLLStorageClass(GlobalValue::DefaultStorageClass);
}
}

// Mark read-only variables which can be imported with specific attribute.
// We can't internalize them now because IRMover will fail to link variable
// definitions to their external declarations during ThinLTO import. We'll
// internalize read-only variables later, after import is finished.
// See internalizeImmutableGVs.
//
// If global value dead stripping is not enabled in summary then
// propagateConstants hasn't been run. We can't internalize GV
// in such case.
if (!GV.isDeclaration() && VI && ImportIndex.withGlobalValueDeadStripping()) {
const auto &SL = VI.getSummaryList();
auto *GVS = SL.empty() ? nullptr : dyn_cast<GlobalVarSummary>(SL[0].get());
if (GVS && GVS->isReadOnly())
cast<GlobalVariable>(&GV)->addAttribute("thinlto-internalize");
}

bool DoPromote = false;
if (GV.hasLocalLinkage() &&
((DoPromote = shouldPromoteLocalToGlobal(&GV)) || isPerformingImport())) {
@@ -230,7 +247,7 @@ void FunctionImportGlobalProcessing::processGlobalForThinLTO(GlobalValue &GV) {
// Remove functions imported as available externally defs from comdats,
// as this is a declaration for the linker, and will be dropped eventually.
// It is illegal for comdats to contain declarations.
auto *GO = dyn_cast_or_null<GlobalObject>(&GV);
auto *GO = dyn_cast<GlobalObject>(&GV);
if (GO && GO->isDeclarationForLinker() && GO->hasComdat()) {
// The IRMover should not have placed any imported declarations in
// a comdat, so the only declaration that should be in a comdat
View file
2 llvm/test/Bitcode/summary_version.ll
@@ -2,7 +2,7 @@
; RUN: opt -module-summary %s -o - | llvm-bcanalyzer -dump | FileCheck %s

; CHECK: <GLOBALVAL_SUMMARY_BLOCK
; CHECK: <VERSION op0=4/>
; CHECK: <VERSION op0=5/>



View file
4 llvm/test/Bitcode/thinlto-alias.ll
@@ -20,7 +20,7 @@
; CHECK-NEXT: <VERSION
; See if the call to func is registered.
; The value id 1 matches the second FUNCTION record above.
; CHECK-NEXT: <PERMODULE {{.*}} op5=1/>
; CHECK-NEXT: <PERMODULE {{.*}} op6=1/>
; CHECK-NEXT: </GLOBALVAL_SUMMARY_BLOCK>

; CHECK: <STRTAB_BLOCK
@@ -33,7 +33,7 @@
; COMBINED-NEXT: <VALUE_GUID op0=[[ALIASID:[0-9]+]] op1=-5751648690987223394/>
; COMBINED-NEXT: <VALUE_GUID
; COMBINED-NEXT: <VALUE_GUID op0=[[ALIASEEID:[0-9]+]] op1=-1039159065113703048/>
; COMBINED-NEXT: <COMBINED {{.*}} op6=[[ALIASID]]/>
; COMBINED-NEXT: <COMBINED {{.*}} op7=[[ALIASID]]/>
; COMBINED-NEXT: <COMBINED {{.*}}
; COMBINED-NEXT: <COMBINED_ALIAS {{.*}} op3=[[ALIASEEID]]
; COMBINED-NEXT: </GLOBALVAL_SUMMARY_BLOCK
View file
2 llvm/test/Bitcode/thinlto-alias2.ll
@@ -4,7 +4,7 @@

; CHECK: <GLOBALVAL_SUMMARY_BLOCK
; CHECK-NEXT: <VERSION
; CHECK-NEXT: <PERMODULE {{.*}} op4=0 op5=[[ALIASID:[0-9]+]]/>
; CHECK-NEXT: <PERMODULE {{.*}} op4=0 op5=0 op6=[[ALIASID:[0-9]+]]/>
; CHECK-NEXT: <PERMODULE {{.*}} op0=[[ALIASEEID:[0-9]+]]
; CHECK-NEXT: <ALIAS {{.*}} op0=[[ALIASID]] {{.*}} op2=[[ALIASEEID]]/>
; CHECK-NEXT: </GLOBALVAL_SUMMARY_BLOCK>
View file
4 llvm/test/Bitcode/thinlto-function-summary-callgraph-cast.ll
@@ -6,9 +6,9 @@
; CHECK: <GLOBALVAL_SUMMARY_BLOCK
; CHECK-NEXT: <VERSION
; "op7" is a call to "callee" function.
; CHECK-NEXT: <PERMODULE {{.*}} op7=3 op8=[[ALIASID:[0-9]+]]/>
; CHECK-NEXT: <PERMODULE {{.*}} op8=3 op9=[[ALIASID:[0-9]+]]/>
; "another_caller" has only references but no calls.
; CHECK-NEXT: <PERMODULE {{.*}} op4=3 {{.*}} op7={{[0-9]+}}/>
; CHECK-NEXT: <PERMODULE {{.*}} op4=3 {{.*}} op8={{[0-9]+}}/>
; CHECK-NEXT: <PERMODULE {{.*}} op0=[[ALIASEEID:[0-9]+]]
; CHECK-NEXT: <ALIAS {{.*}} op0=[[ALIASID]] {{.*}} op2=[[ALIASEEID]]/>
; CHECK-NEXT: </GLOBALVAL_SUMMARY_BLOCK>
View file
4 llvm/test/Bitcode/thinlto-function-summary-callgraph-pgo.ll
@@ -17,7 +17,7 @@
; CHECK: <GLOBALVAL_SUMMARY_BLOCK
; CHECK-NEXT: <VERSION
; See if the call to func is registered, using the expected hotness type.
; CHECK-NEXT: <PERMODULE_PROFILE {{.*}} op5=1 op6=2/>
; CHECK-NEXT: <PERMODULE_PROFILE {{.*}} op6=1 op7=2/>
; CHECK-NEXT: </GLOBALVAL_SUMMARY_BLOCK>
; CHECK: <STRTAB_BLOCK
; CHECK-NEXT: blob data = 'mainfunc{{.*}}'
@@ -30,7 +30,7 @@
; COMBINED-NEXT: <COMBINED
; See if the call to func is registered, using the expected hotness type.
; op6=2 which is hotnessType::None.
; COMBINED-NEXT: <COMBINED_PROFILE {{.*}} op6=[[FUNCID]] op7=2/>
; COMBINED-NEXT: <COMBINED_PROFILE {{.*}} op7=[[FUNCID]] op8=2/>
; COMBINED-NEXT: </GLOBALVAL_SUMMARY_BLOCK>

; ModuleID = 'thinlto-function-summary-callgraph.ll'
View file
4 llvm/test/Bitcode/thinlto-function-summary-callgraph-profile-summary.ll
@@ -48,7 +48,7 @@
; CHECK-NEXT: <VERSION
; CHECK-NEXT: <VALUE_GUID op0=25 op1=123/>
; op4=hot1 op6=cold op8=hot2 op10=hot4 op12=none1 op14=hot3 op16=none2 op18=none3 op20=123
; CHECK-NEXT: <PERMODULE_PROFILE {{.*}} op5=1 op6=3 op7=5 op8=1 op9=2 op10=3 op11=4 op12=1 op13=6 op14=2 op15=3 op16=3 op17=7 op18=2 op19=8 op20=2 op21=25 op22=4/>
; CHECK-NEXT: <PERMODULE_PROFILE {{.*}} op6=1 op7=3 op8=5 op9=1 op10=2 op11=3 op12=4 op13=1 op14=6 op15=2 op16=3 op17=3 op18=7 op19=2 op20=8 op21=2 op22=25 op23=4/>
; CHECK-NEXT: </GLOBALVAL_SUMMARY_BLOCK>

; CHECK: <STRTAB_BLOCK
@@ -71,7 +71,7 @@
; COMBINED-NEXT: <COMBINED abbrevid=
; COMBINED-NEXT: <COMBINED abbrevid=
; COMBINED-NEXT: <COMBINED abbrevid=
; COMBINED-NEXT: <COMBINED_PROFILE {{.*}} op6=[[HOT1:.*]] op7=3 op8=[[COLD:.*]] op9=1 op10=[[HOT2:.*]] op11=3 op12=[[NONE1:.*]] op13=2 op14=[[HOT3:.*]] op15=3 op16=[[NONE2:.*]] op17=2 op18=[[NONE3:.*]] op19=2/>
; COMBINED-NEXT: <COMBINED_PROFILE {{.*}} op7=[[HOT1:.*]] op8=3 op9=[[COLD:.*]] op10=1 op11=[[HOT2:.*]] op12=3 op13=[[NONE1:.*]] op14=2 op15=[[HOT3:.*]] op16=3 op17=[[NONE2:.*]] op18=2 op19=[[NONE3:.*]] op20=2/>
; COMBINED_NEXT: <COMBINED abbrevid=
; COMBINED_NEXT: </GLOBALVAL_SUMMARY_BLOCK>

View file
2 llvm/test/Bitcode/thinlto-function-summary-callgraph-relbf.ll
@@ -13,7 +13,7 @@
; CHECK: <GLOBALVAL_SUMMARY_BLOCK
; CHECK-NEXT: <VERSION
; See if the call to func is registered.
; CHECK-NEXT: <PERMODULE_RELBF {{.*}} op4=1 {{.*}} op7=256
; CHECK-NEXT: <PERMODULE_RELBF {{.*}} op4=1 {{.*}} op8=256
; CHECK-NEXT: </GLOBALVAL_SUMMARY_BLOCK>
; CHECK: <STRTAB_BLOCK
; CHECK-NEXT: blob data = 'undefinedglobmainfunc{{.*}}'
View file
4 llvm/test/Bitcode/thinlto-function-summary-callgraph-sample-profile-summary.ll
@@ -31,7 +31,7 @@
; CHECK-NEXT: <VERSION
; CHECK-NEXT: <VALUE_GUID op0=26 op1=123/>
; op4=none1 op6=hot1 op8=cold1 op10=none2 op12=hot2 op14=cold2 op16=none3 op18=hot3 op20=cold3 op22=123
; CHECK-NEXT: <PERMODULE_PROFILE {{.*}} op5=7 op6=0 op7=1 op8=3 op9=4 op10=1 op11=8 op12=0 op13=2 op14=3 op15=5 op16=1 op17=9 op18=0 op19=3 op20=3 op21=6 op22=1 op23=26 op24=4/>
; CHECK-NEXT: <PERMODULE_PROFILE {{.*}} op6=7 op7=0 op8=1 op9=3 op10=4 op11=1 op12=8 op13=0 op14=2 op15=3 op16=5 op17=1 op18=9 op19=0 op20=3 op21=3 op22=6 op23=1 op24=26 op25=4/>
; CHECK-NEXT: </GLOBALVAL_SUMMARY_BLOCK>

; CHECK: <STRTAB_BLOCK
@@ -58,7 +58,7 @@
; COMBINED-NEXT: <COMBINED abbrevid=
; COMBINED-NEXT: <COMBINED abbrevid=
; COMBINED-NEXT: <COMBINED abbrevid=
; COMBINED-NEXT: <COMBINED_PROFILE {{.*}} op6=[[NONE1:.*]] op7=0 op8=[[HOT1:.*]] op9=3 op10=[[COLD1:.*]] op11=1 op12=[[NONE2:.*]] op13=0 op14=[[HOT2:.*]] op15=3 op16=[[COLD2:.*]] op17=1 op18=[[NONE3:.*]] op19=0 op20=[[HOT3:.*]] op21=3 op22=[[COLD3:.*]] op23=1/>
; COMBINED-NEXT: <COMBINED_PROFILE {{.*}} op7=[[NONE1:.*]] op8=0 op9=[[HOT1:.*]] op10=3 op11=[[COLD1:.*]] op12=1 op13=[[NONE2:.*]] op14=0 op15=[[HOT2:.*]] op16=3 op17=[[COLD2:.*]] op18=1 op19=[[NONE3:.*]] op20=0 op21=[[HOT3:.*]] op22=3 op23=[[COLD3:.*]] op24=1/>
; COMBINED_NEXT: <COMBINED abbrevid=
; COMBINED_NEXT: </GLOBALVAL_SUMMARY_BLOCK>

View file
4 llvm/test/Bitcode/thinlto-function-summary-callgraph.ll
@@ -17,7 +17,7 @@
; CHECK-NEXT: <FUNCTION op0=17 op1=4
; CHECK: <GLOBALVAL_SUMMARY_BLOCK
; CHECK-NEXT: <VERSION
; See if the call to func is registered.
; See if the call to func is registered
; CHECK-NEXT: <PERMODULE {{.*}} op4=1
; CHECK-NEXT: </GLOBALVAL_SUMMARY_BLOCK>
; CHECK: <STRTAB_BLOCK
@@ -33,7 +33,7 @@
; COMBINED-NEXT: <VALUE_GUID
; COMBINED-NEXT: <COMBINED
; See if the call to func is registered.
; COMBINED-NEXT: <COMBINED {{.*}} op6=[[FUNCID]]/>
; COMBINED-NEXT: <COMBINED {{.*}} op7=[[FUNCID]]/>
; COMBINED-NEXT: </GLOBALVAL_SUMMARY_BLOCK>

; ModuleID = 'thinlto-function-summary-callgraph.ll'
View file
12 llvm/test/Bitcode/thinlto-function-summary-refgraph.ll
@@ -41,27 +41,27 @@
; CHECK: <GLOBALVAL_SUMMARY_BLOCK
; Function main contains call to func, as well as address reference to func:
; op0=main op4=func op5=func
; CHECK-DAG: <PERMODULE {{.*}} op0=11 op1=0 {{.*}} op4=1 op5=2 op6=2/>
; CHECK-DAG: <PERMODULE {{.*}} op0=11 op1=0 {{.*}} op4=1 op5=0 op6=2 op7=2/>
; Function W contains a call to func3 as well as a reference to globalvar:
; op0=W op4=globalvar op5=func3
; CHECK-DAG: <PERMODULE {{.*}} op0=6 op1=5 {{.*}} op4=1 op5=1 op6=5/>
; CHECK-DAG: <PERMODULE {{.*}} op0=6 op1=5 {{.*}} op4=1 op5=0 op6=1 op7=5/>
; Function X contains call to foo, as well as address reference to foo
; which is in the same instruction as the call:
; op0=X op4=foo op5=foo
; CHECK-DAG: <PERMODULE {{.*}} op0=7 op1=1 {{.*}} op4=1 op5=4 op6=4/>
; CHECK-DAG: <PERMODULE {{.*}} op0=7 op1=1 {{.*}} op4=1 op5=0 op6=4 op7=4/>
; Function Y contains call to func2, and ensures we don't incorrectly add
; a reference to it when reached while earlier analyzing the phi using its
; return value:
; op0=Y op4=func2
; CHECK-DAG: <PERMODULE {{.*}} op0=8 op1=72 {{.*}} op4=0 op5=3/>
; CHECK-DAG: <PERMODULE {{.*}} op0=8 op1=72 {{.*}} op4=0 op5=0 op6=3/>
; Function Z contains call to func2, and ensures we don't incorrectly add
; a reference to it when reached while analyzing subsequent use of its return
; value:
; op0=Z op4=func2
; CHECK-DAG: <PERMODULE {{.*}} op0=9 op1=3 {{.*}} op4=0 op5=3/>
; CHECK-DAG: <PERMODULE {{.*}} op0=9 op1=3 {{.*}} op4=0 op5=0 op6=3/>
; Variable bar initialization contains address reference to func:
; op0=bar op2=func
; CHECK-DAG: <PERMODULE_GLOBALVAR_INIT_REFS {{.*}} op0=0 op1=0 op2=2/>
; CHECK-DAG: <PERMODULE_GLOBALVAR_INIT_REFS {{.*}} op0=0 op1=0 op2=1 op3=2/>
; CHECK: </GLOBALVAL_SUMMARY_BLOCK>

; CHECK: <STRTAB_BLOCK
View file
5 llvm/test/ThinLTO/X86/Inputs/index-const-prop-alias.ll
@@ -0,0 +1,5 @@
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@g = global i32 42, align 4
@g.alias = weak alias i32, i32* @g
View file
19 llvm/test/ThinLTO/X86/Inputs/index-const-prop-cache-foo.ll
@@ -0,0 +1,19 @@
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@gFoo = internal unnamed_addr global i32 1, align 4

; Function Attrs: norecurse nounwind readonly ssp uwtable
define i32 @foo() local_unnamed_addr {
%1 = load i32, i32* @gFoo, align 4
ret i32 %1
}

; Function Attrs: nounwind ssp uwtable
define void @bar() local_unnamed_addr {
%1 = tail call i32 @rand()
store i32 %1, i32* @gFoo, align 4
ret void
}

declare i32 @rand() local_unnamed_addr
View file
10 llvm/test/ThinLTO/X86/Inputs/index-const-prop-cache-test1.ll
@@ -0,0 +1,10 @@
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: nounwind ssp uwtable
define i32 @test() local_unnamed_addr {
%1 = tail call i32 (...) @foo()
ret i32 %1
}

declare i32 @foo(...) local_unnamed_addr
View file
14 llvm/test/ThinLTO/X86/Inputs/index-const-prop-cache-test2.ll
@@ -0,0 +1,14 @@
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: nounwind ssp uwtable
define i32 @test() local_unnamed_addr {
%1 = tail call i32 (...) @foo()
%2 = tail call i32 (...) @bar()
%3 = add nsw i32 %2, %1
ret i32 %3
}

declare i32 @foo(...) local_unnamed_addr

declare i32 @bar(...) local_unnamed_addr
View file
5 llvm/test/ThinLTO/X86/Inputs/index-const-prop-comdat.ll
@@ -0,0 +1,5 @@
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

$comdat.any = comdat any
@g = global i32 42, comdat($comdat.any)
View file
4 llvm/test/ThinLTO/X86/Inputs/index-const-prop-define-g.ll
@@ -0,0 +1,4 @@
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@g = global i32 42, align 4
View file
12 llvm/test/ThinLTO/X86/Inputs/index-const-prop-full-lto.ll
@@ -0,0 +1,12 @@
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@g = external global i32

define i32 @foo() {
%v = load i32, i32* @g
ret i32 %v
}

!0 = !{i32 1, !"ThinLTO", i32 0}
!llvm.module.flags = !{ !0 }
View file
5 llvm/test/ThinLTO/X86/Inputs/index-const-prop-gvref.ll
@@ -0,0 +1,5 @@
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@b = global i32* @a, align 8
@a = global i32 42, align 4
View file
15 llvm/test/ThinLTO/X86/Inputs/index-const-prop-linkage.ll
@@ -0,0 +1,15 @@
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@g1 = common global i32 0, align 4
@g2 = global i32 42, align 4
@g3 = available_externally global i32 42, align 4

define i32 @foo() {
%v1 = load i32, i32* @g1
%v2 = load i32, i32* @g2
%v3 = load i32, i32* @g3
%s1 = add i32 %v1, %v2
%s2 = add i32 %s1, %v3
ret i32 %s2
}
View file
64 llvm/test/ThinLTO/X86/Inputs/index-const-prop.ll
@@ -0,0 +1,64 @@
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-linux-gnu"

@gBar = local_unnamed_addr global i32 2, align 4, !dbg !0
@gFoo = internal unnamed_addr global i32 1, align 4, !dbg !6

; Function Attrs: norecurse nounwind readonly
define i32 @foo() local_unnamed_addr #0 !dbg !14 {
%1 = load i32, i32* @gFoo, align 4, !dbg !17
ret i32 %1, !dbg !18
}

; Function Attrs: norecurse nounwind readonly
define i32 @bar() local_unnamed_addr #0 !dbg !19 {
%1 = load i32, i32* @gBar, align 4, !dbg !20
ret i32 %1, !dbg !21
}

define void @baz() local_unnamed_addr !dbg !22 {
%1 = tail call i32 @rand(), !dbg !25
store i32 %1, i32* @gFoo, align 4, !dbg !26
%2 = tail call i32 @rand(), !dbg !27
store i32 %2, i32* @gBar, align 4, !dbg !28
ret void, !dbg !29
}

declare i32 @rand() local_unnamed_addr

attributes #0 = { norecurse nounwind readonly }

!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!9, !10, !11, !12}
!llvm.ident = !{!13}

!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "gBar", scope: !2, file: !3, line: 4, type: !8, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 7.0.0 (trunk 332246)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
!3 = !DIFile(filename: "foo.c", directory: "/data/work/lto/roref/test")
!4 = !{}
!5 = !{!0, !6}
!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
!7 = distinct !DIGlobalVariable(name: "gFoo", scope: !2, file: !3, line: 3, type: !8, isLocal: true, isDefinition: true)
!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!9 = !{i32 2, !"Dwarf Version", i32 4}
!10 = !{i32 2, !"Debug Info Version", i32 3}
!11 = !{i32 1, !"wchar_size", i32 4}
!12 = !{i32 7, !"PIC Level", i32 2}
!13 = !{!"clang version 7.0.0 (trunk 332246)"}
!14 = distinct !DISubprogram(name: "foo", scope: !3, file: !3, line: 6, type: !15, isLocal: false, isDefinition: true, scopeLine: 6, isOptimized: true, unit: !2, retainedNodes: !4)
!15 = !DISubroutineType(types: !16)
!16 = !{!8}
!17 = !DILocation(line: 7, column: 10, scope: !14)
!18 = !DILocation(line: 7, column: 3, scope: !14)
!19 = distinct !DISubprogram(name: "bar", scope: !3, file: !3, line: 10, type: !15, isLocal: false, isDefinition: true, scopeLine: 10, isOptimized: true, unit: !2, retainedNodes: !4)
!20 = !DILocation(line: 11, column: 10, scope: !19)
!21 = !DILocation(line: 11, column: 3, scope: !19)
!22 = distinct !DISubprogram(name: "baz", scope: !3, file: !3, line: 14, type: !23, isLocal: false, isDefinition: true, scopeLine: 14, isOptimized: true, unit: !2, retainedNodes: !4)
!23 = !DISubroutineType(types: !24)
!24 = !{null}
!25 = !DILocation(line: 15, column: 10, scope: !22)
!26 = !DILocation(line: 15, column: 8, scope: !22)
!27 = !DILocation(line: 16, column: 10, scope: !22)
!28 = !DILocation(line: 16, column: 8, scope: !22)
!29 = !DILocation(line: 17, column: 1, scope: !22)
View file
10 llvm/test/ThinLTO/X86/dot-dumper.ll
@@ -20,7 +20,7 @@
; STRUCTURE-DAG: subgraph cluster_1
; STRUCTURE: // Cross-module edges:
; STRUCTURE-DAG: M0_{{[0-9]+}} -> M1_{{[0-9]+}} // call
; STRUCTURE-DAG: M0_{{[0-9]+}} -> M1_{{[0-9]+}} [{{.*}}]; // ref
; STRUCTURE-DAG: M0_{{[0-9]+}} -> M1_{{[0-9]+}} [{{.*}}]; // const-ref
; STRUCTURE-NEXT: }

; CLUSTER0: // Module: {{.*}}1.bc
@@ -33,13 +33,13 @@

; CLUSTER1: // Module: {{.*}}2.bc
; CLUSTER1-NEXT: subgraph cluster_1 {
; CLUSTER1-DAG: M1_[[A:[0-9]+]] [{{.*}}A|extern{{.*}}]; // variable
; CLUSTER1-DAG: M1_[[A:[0-9]+]] [{{.*}}A|extern{{.*}}]; // variable, immutable
; CLUSTER1-DAG: M1_[[FOO:[0-9]+]] [{{.*}}foo|extern{{.*}} ffl: 00001{{.*}}]; // function
; CLUSTER1-DAG: M1_[[B:[0-9]+]] [{{.*}}B|extern{{.*}}]; // variable
; CLUSTER1-DAG: M1_[[B:[0-9]+]] [{{.*}}B|extern{{.*}}]; // variable, immutable
; CLUSTER1-DAG: M1_[[BAR:[0-9]+]] [{{.*}}bar|extern{{.*}}]; // function, dead
; CLUSTER1-NEXT: // Edges:
; CLUSTER1-DAG: M1_[[FOO]] -> M1_[[B]] [{{.*}}]; // ref
; CLUSTER1-DAG: M1_[[FOO]] -> M1_[[A]] [{{.*}}]; // ref
; CLUSTER1-DAG: M1_[[FOO]] -> M1_[[B]] [{{.*}}]; // const-ref
; CLUSTER1-DAG: M1_[[FOO]] -> M1_[[A]] [{{.*}}]; // const-ref
; CLUSTER1-DAG: }

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
View file
4 llvm/test/ThinLTO/X86/globals-import-const-fold.ll
@@ -2,12 +2,12 @@
; RUN: opt -module-summary %p/Inputs/globals-import-cf-baz.ll -o %t2.bc
; RUN: llvm-lto -thinlto-action=thinlink %t1.bc %t2.bc -o %t3.index.bc

; RUN: llvm-lto -thinlto-action=import %t1.bc %t2.bc -thinlto-index=%t3.index.bc
; RUN: llvm-lto -thinlto-action=import -exported-symbol=main %t1.bc -thinlto-index=%t3.index.bc
; RUN: llvm-dis %t1.bc.thinlto.imported.bc -o - | FileCheck --check-prefix=IMPORT %s
; RUN: llvm-lto -thinlto-action=optimize %t1.bc.thinlto.imported.bc -o %t1.bc.thinlto.opt.bc
; RUN: llvm-dis %t1.bc.thinlto.opt.bc -o - | FileCheck --check-prefix=OPTIMIZE %s

; IMPORT: @baz = available_externally local_unnamed_addr constant i32 10
; IMPORT: @baz = internal local_unnamed_addr constant i32 10

; OPTIMIZE: define i32 @main()
; OPTIMIZE-NEXT: ret i32 10
View file
18 llvm/test/ThinLTO/X86/index-const-prop-O0.ll
@@ -0,0 +1,18 @@
; RUN: opt -module-summary %s -o %t1.bc
; RUN: opt -module-summary %p/Inputs/index-const-prop-define-g.ll -o %t2.bc
; RUN: llvm-lto2 run -O0 -save-temps %t2.bc -r=%t2.bc,g,pl %t1.bc -r=%t1.bc,main,plx -r=%t1.bc,g, -o %t3
; RUN: llvm-dis %t3.1.3.import.bc -o - | FileCheck %s

; With -O0 import is disabled so we must not internalize
; read-only globals
; CHECK: @g = dso_local global i32 42

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@g = external global i32

define i32 @main() {
%v = load i32, i32* @g
ret i32 %v
}
View file
42 llvm/test/ThinLTO/X86/index-const-prop-alias.ll
@@ -0,0 +1,42 @@
; RUN: opt -module-summary %s -o %t1.bc
; RUN: opt -module-summary %p/Inputs/index-const-prop-alias.ll -o %t2.bc
; RUN: llvm-lto2 run %t1.bc -r=%t1.bc,main,plx -r=%t1.bc,ret_ptr,pl -r=%t1.bc,g.alias,l -r=%t1.bc,g,l \
; RUN: %t2.bc -r=%t2.bc,g,pl -r=%t2.bc,g.alias,pl -save-temps -o %t3
; RUN: llvm-dis %t3.1.3.import.bc -o - | FileCheck %s --check-prefix=IMPORT
; RUN: llvm-dis %t3.1.5.precodegen.bc -o - | FileCheck %s --check-prefix=CODEGEN

; When ret_ptr is preserved we return pointer to alias, so we can't internalize aliasee
; RUN: llvm-lto2 run %t1.bc -r=%t1.bc,main,plx -r=%t1.bc,ret_ptr,plx -r=%t1.bc,g.alias,l -r=%t1.bc,g,l \
; RUN: %t2.bc -r=%t2.bc,g,pl -r=%t2.bc,g.alias,pl -save-temps -o %t4
; RUN: llvm-dis %t4.1.3.import.bc -o - | FileCheck %s --check-prefix=PRESERVED

; When g.alias is preserved we can't internalize aliasee either
; RUN: llvm-lto2 run %t1.bc -r=%t1.bc,main,plx -r=%t1.bc,ret_ptr,pl -r=%t1.bc,g.alias,l -r=%t1.bc,g,l \
; RUN: %t2.bc -r=%t2.bc,g,pl -r=%t2.bc,g.alias,plx -save-temps -o %t5
; RUN: llvm-dis %t5.1.3.import.bc -o - | FileCheck %s --check-prefix=PRESERVED

; We currently don't support importing aliases
; IMPORT: @g.alias = external dso_local global i32
; IMPORT-NEXT: @g = internal global i32 42, align 4 #0
; IMPORT: attributes #0 = { "thinlto-internalize" }

; CODEGEN: define dso_local i32 @main
; CODEGEN-NEXT: ret i32 42

; PRESERVED: @g.alias = external dso_local global i32
; PRESERVED-NEXT: @g = available_externally dso_local global i32 42, align 4

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@g.alias = external global i32
@g = external global i32

define i32 @main() {
%v = load i32, i32* @g
ret i32 %v
}

define i32* @ret_ptr() {
ret i32* @g.alias
}
View file
41 llvm/test/ThinLTO/X86/index-const-prop-cache.ll
@@ -0,0 +1,41 @@
; Check that we correctly handle 'ReadOnly' attribute when computing cache key
; RUN: opt -module-summary -module-hash %s -o %t1.bc
; RUN: opt -module-summary -module-hash %p/Inputs/index-const-prop-cache-foo.ll -o %t2.bc
; RUN: opt -module-summary -module-hash %p/Inputs/index-const-prop-cache-test1.ll -o %t3.bc
; RUN: opt -module-summary -module-hash %p/Inputs/index-const-prop-cache-test2.ll -o %t4.bc
; RUN: rm -Rf %t.cache && mkdir %t.cache

; Here @gFoo variable is writeable
; RUN: llvm-lto -thinlto-action=run %t1.bc %t4.bc %t2.bc \
; RUN: -exported-symbol=main -exported-symbol=test -thinlto-cache-dir=%t.cache
; RUN: ls %t.cache/llvmcache-* | count 3

; Now gFoo is read-only and all modules should get different cache keys.
; RUN: llvm-lto -thinlto-action=run %t1.bc %t3.bc %t2.bc \
; RUN: -exported-symbol=main -exported-symbol=test -thinlto-cache-dir=%t.cache
; RUN: ls %t.cache/llvmcache-* | count 6

; Do the same but with llvm-lto2
; RUN: rm -Rf %t.cache && mkdir %t.cache
; RUN: llvm-lto2 run %t1.bc %t4.bc %t2.bc -cache-dir=%t.cache -o %t5 \
; RUN: -r=%t1.bc,main,plx -r=%t1.bc,foo,l \
; RUN: -r=%t4.bc,test,plx -r=%t4.bc,foo,l -r=%t4.bc,bar,l \
; RUN: -r=%t2.bc,foo,pl -r=%t2.bc,bar,pl -r=%t2.bc,rand,
; RUN: ls %t.cache/llvmcache-* | count 3

; RUN: llvm-lto2 run %t1.bc %t3.bc %t2.bc -cache-dir %t.cache -o %t6 \
; RUN: -r=%t1.bc,main,plx -r=%t1.bc,foo,l \
; RUN: -r=%t3.bc,test,plx -r=%t3.bc,foo,l \
; RUN: -r=%t2.bc,foo,pl -r=%t2.bc,bar,pl -r=%t2.bc,rand,
; RUN: ls %t.cache/llvmcache-* | count 6

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: nounwind ssp uwtable
define i32 @main() local_unnamed_addr {
%1 = tail call i32 (...) @foo()
ret i32 %1
}

declare i32 @foo(...) local_unnamed_addr
View file
17 llvm/test/ThinLTO/X86/index-const-prop-comdat.ll
@@ -0,0 +1,17 @@
; RUN: opt -module-summary %s -o %t1.bc
; RUN: opt -module-summary %p/Inputs/index-const-prop-comdat.ll -o %t2.bc
; RUN: llvm-lto2 run -save-temps %t2.bc -r=%t2.bc,g,pl %t1.bc -r=%t1.bc,main,plx -r=%t1.bc,g, -o %t3
; RUN: llvm-dis %t3.2.3.import.bc -o - | FileCheck %s

; Comdats are not internalized even if they are read only.
; CHECK: @g = available_externally dso_local global i32 42

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@g = external global i32

define i32 @main() {
%v = load i32, i32* @g
ret i32 %v
}
View file
26 llvm/test/ThinLTO/X86/index-const-prop-dead.ll
@@ -0,0 +1,26 @@
; RUN: opt -module-summary %s -o %t1.bc
; RUN: opt -module-summary %p/Inputs/index-const-prop-define-g.ll -o %t2.bc
; RUN: llvm-lto2 run -save-temps %t2.bc -r=%t2.bc,g,pl \
; RUN: %t1.bc -r=%t1.bc,main,plx -r=%t1.bc,foo,pl -r=%t1.bc,g, -o %t3
; RUN: llvm-dis %t3.2.3.import.bc -o - | FileCheck %s

; Dead globals are converted to declarations by ThinLTO in dropDeadSymbols
; If we try to internalize such we'll get a broken module.
; CHECK: @g = external dso_local global i32

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@g = external global i32

; We need at least one live symbol to enable dead stripping
; Otherwise ModuleSummaryIndex::isGlobalValueLive will always
; return true.
define i32 @main() {
ret i32 42
}

define i32 @foo() {
%v = load i32, i32* @g
ret i32 %v
}
View file
24 llvm/test/ThinLTO/X86/index-const-prop-full-lto.ll
@@ -0,0 +1,24 @@
; RUN: opt -module-summary %s -o %t1.bc
; RUN: opt -module-summary %p/Inputs/index-const-prop-define-g.ll -o %t2.bc
; RUN: opt -module-summary %p/Inputs/index-const-prop-full-lto.ll -o %t3.bc
; RUN: llvm-lto2 run -save-temps %t2.bc -r=%t2.bc,g,pl \
; RUN: %t1.bc -r=%t1.bc,foo,l -r=%t1.bc,main,plx -r=%t1.bc,g, \
; RUN: %t3.bc -r=%t3.bc,foo,pl -r=%t3.bc,g, -o %t4
; RUN: llvm-dis %t4.2.3.import.bc -o - | FileCheck %s

; All references from functions in full LTO module are not constant.
; We cannot internalize @g
; CHECK: @g = available_externally dso_local global i32 42

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

declare i32 @foo()
@g = external global i32

define i32 @main() {
%v = call i32 @foo()
%v2 = load i32, i32* @g
%v3 = add i32 %v, %v2
ret i32 %v3
}
View file
27 llvm/test/ThinLTO/X86/index-const-prop-gvref.ll
@@ -0,0 +1,27 @@
; RUN: opt -module-summary %s -o %t1.bc
; RUN: opt -module-summary %p/Inputs/index-const-prop-gvref.ll -o %t2.bc
; RUN: llvm-lto2 run -save-temps %t2.bc -r=%t2.bc,b,pl -r=%t2.bc,a,pl \
; RUN: %t1.bc -r=%t1.bc,main,plx -r=%t1.bc,a, -r=%t1.bc,b, -o %t3
; RUN: llvm-dis %t3.1.3.import.bc -o - | FileCheck %s --check-prefix=SRC
; RUN: llvm-dis %t3.2.3.import.bc -o - | FileCheck %s --check-prefix=DEST

; No variable in the source module should have been internalized
; SRC: @b = dso_local global i32* @a
; SRC-NEXT: @a = dso_local global i32 42

; We can't internalize globals referenced by other live globals
; DEST: @b = external dso_local global i32*
; DEST-NEXT: @a = available_externally dso_local global i32 42, align 4

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@a = external global i32
@b = external global i32*

define i32 @main() {
%p = load i32*, i32** @b, align 8
store i32 33, i32* %p, align 4
%v = load i32, i32* @a, align 4
ret i32 %v
}
View file
21 llvm/test/ThinLTO/X86/index-const-prop-ldst.ll
@@ -0,0 +1,21 @@
; RUN: opt -module-summary %s -o %t1.bc
; RUN: opt -module-summary %p/Inputs/index-const-prop-define-g.ll -o %t2.bc
; RUN: llvm-lto2 run -save-temps %t2.bc -r=%t2.bc,g,pl %t1.bc -r=%t1.bc,main,plx -r=%t1.bc,g, -o %t3
; RUN: llvm-dis %t3.2.3.import.bc -o - | FileCheck %s

; The 'store' instruction in @main should prevent internalization
; even when there is 'load' instruction before it.
; CHECK: @g = available_externally dso_local global i32 42

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@g = external global i32

define i32 @main() {
%v = load i32, i32* @g
%q = add i32 %v, 1
store i32 %q, i32* @g

ret i32 %v
}
View file
27 llvm/test/ThinLTO/X86/index-const-prop-linkage.ll
@@ -0,0 +1,27 @@
; RUN: opt -module-summary %s -o %t1.bc
; RUN: opt -module-summary %p/Inputs/index-const-prop-linkage.ll -o %t2.bc
; RUN: llvm-lto2 run -save-temps %t2.bc -r=%t2.bc,foo,pl -r=%t2.bc,g1,pl -r=%t2.bc,g2,pl -r=%t2.bc,g3, \
; RUN: %t1.bc -r=%t1.bc,foo, -r=%t1.bc,main,plx -r=%t1.bc,g2, -o %t3
; RUN: llvm-dis %t3.2.3.import.bc -o - | FileCheck %s

; Check that we never internalize anything with:
; - appending linkage
; - common linkage
; - available_externally linkage
; - reference from @llvm.used
; CHECK: @llvm.used = appending global [1 x i32*] [i32* @g2]
; CHECK-NEXT: @g1 = external dso_local global i32, align 4
; CHECK-NEXT: @g2 = available_externally dso_local global i32 42, align 4
; CHECK-NEXT: @g3 = available_externally global i32 42, align 4

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

declare i32 @foo()
@g2 = external global i32
@llvm.used = appending global [1 x i32*] [i32* @g2]

define i32 @main() {
%v = call i32 @foo()
ret i32 %v
}
View file
40 llvm/test/ThinLTO/X86/index-const-prop.ll
@@ -0,0 +1,40 @@
; Check constant propagation in thinlto combined summary. This allows us to do 2 things:
; 1. Internalize global definition which is not used externally if all accesses to it are read-only
; 2. Make a local copy of internal definition if all accesses to it are readonly. This allows constant
; folding it during optimziation phase.

; RUN: opt -module-summary %s -o %t1.bc
; RUN: opt -module-summary %p/Inputs/index-const-prop.ll -o %t2.bc
; RUN: llvm-lto -thinlto-action=thinlink -o %t3.index.bc %t1.bc %t2.bc
; RUN: llvm-lto -thinlto-action=import -exported-symbol=main %t1.bc -thinlto-index=%t3.index.bc -o %t1.imported.bc
; RUN: llvm-dis %t1.imported.bc -o - | FileCheck %s --check-prefix=IMPORT
; RUN: llvm-lto -thinlto-action=optimize %t1.imported.bc -o - | llvm-dis - -o - | FileCheck %s --check-prefix=OPTIMIZE

; Check that we don't internalize gBar when it is exported
; RUN: llvm-lto -thinlto-action=import -exported-symbol main -exported-symbol gBar %t1.bc -thinlto-index=%t3.index.bc -o %t1.imported2.bc
; RUN: llvm-dis %t1.imported2.bc -o - | FileCheck %s --check-prefix=IMPORT2

; IMPORT: @gFoo.llvm.0 = internal unnamed_addr global i32 1, align 4, !dbg !0
; IMPORT-NEXT: @gBar = internal local_unnamed_addr global i32 2, align 4, !dbg !5
; IMPORT: !DICompileUnit({{.*}}, globals: !{{[0-9]+}})

; OPTIMIZE: define i32 @main
; OPTIMIZE-NEXT: ret i32 3

; IMPORT2: @gBar = available_externally local_unnamed_addr global i32 2, align 4, !dbg !5

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-linux-gnu"

@gBar = external global i32

define i32 @main() local_unnamed_addr {
%call = tail call i32 bitcast (i32 (...)* @foo to i32 ()*)()
%call1 = tail call i32 bitcast (i32 (...)* @bar to i32 ()*)()
%add = add nsw i32 %call1, %call
ret i32 %add
}

declare i32 @foo(...) local_unnamed_addr

declare i32 @bar(...) local_unnamed_addr
View file
59 llvm/test/ThinLTO/X86/index-const-prop2.ll
@@ -0,0 +1,59 @@
; Check constant propagation in thinlto combined summary. This allows us to do 2 things:
; 1. Internalize global definition which is not used externally if all accesses to it are read-only
; 2. Make a local copy of internal definition if all accesses to it are readonly. This allows constant
; folding it during optimziation phase.
; RUN: opt -module-summary %s -o %t1.bc
; RUN: opt -module-summary %p/Inputs/index-const-prop.ll -o %t2.bc
; RUN: llvm-lto2 run %t1.bc %t2.bc -save-temps \
; RUN: -r=%t2.bc,foo,pl \
; RUN: -r=%t2.bc,bar,pl \
; RUN: -r=%t2.bc,baz,pl \
; RUN: -r=%t2.bc,rand, \
; RUN: -r=%t2.bc,gBar,pl \
; RUN: -r=%t1.bc,main,plx \
; RUN: -r=%t1.bc,foo, \
; RUN: -r=%t1.bc,bar, \
; RUN: -r=%t1.bc,gBar, \
; RUN: -o %t3
; RUN: llvm-dis %t3.1.3.import.bc -o - | FileCheck %s --check-prefix=IMPORT
; RUN: llvm-dis %t3.1.5.precodegen.bc -o - | FileCheck %s --check-prefix=CODEGEN

; Now check that we won't internalize global (gBar) if it's externally referenced
; RUN: llvm-lto2 run %t1.bc %t2.bc -save-temps \
; RUN: -r=%t2.bc,foo,pl \
; RUN: -r=%t2.bc,bar,pl \
; RUN: -r=%t2.bc,baz,pl \
; RUN: -r=%t2.bc,rand, \
; RUN: -r=%t2.bc,gBar,plx \
; RUN: -r=%t1.bc,main,plx \
; RUN: -r=%t1.bc,foo, \
; RUN: -r=%t1.bc,bar, \
; RUN: -r=%t1.bc,gBar, \
; RUN: -o %t3
; RUN: llvm-dis %t3.1.3.import.bc -o - | FileCheck %s --check-prefix=IMPORT2

; IMPORT: @gFoo.llvm.0 = internal unnamed_addr global i32 1, align 4
; IMPORT-NEXT: @gBar = internal local_unnamed_addr global i32 2, align 4
; IMPORT: !DICompileUnit({{.*}}, globals: !{{[0-9]+}})

; CODEGEN: i32 @main()
; CODEGEN-NEXT: ret i32 3

; IMPORT2: @gBar = available_externally dso_local local_unnamed_addr global i32 2, align 4

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-linux-gnu"

; We should be able to link external definition of gBar to its declaration
@gBar = external global i32

define i32 @main() local_unnamed_addr {
%call = tail call i32 bitcast (i32 (...)* @foo to i32 ()*)()
%call1 = tail call i32 bitcast (i32 (...)* @bar to i32 ()*)()
%add = add nsw i32 %call1, %call
ret i32 %add
}

declare i32 @foo(...) local_unnamed_addr

declare i32 @bar(...) local_unnamed_addr