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Move summary dead stripping before regular LTO.

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This way dead stripping results are recorded in combined summary and
can be used in regular LTO passes.

Differential Revision: https://reviews.llvm.org/D33615

llvm-svn: 304577
This commit is contained in:
Evgeniy Stepanov
2017-06-02 18:24:17 +00:00
parent 469014ada4
commit 659b3bc77d
2 changed files with 28 additions and 14 deletions
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26
llvm/lib/LTO/LTO.cpp
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@@ -622,6 +622,19 @@ unsigned LTO::getMaxTasks() const {
}
Error LTO::run(AddStreamFn AddStream, NativeObjectCache Cache) {
// Compute "dead" symbols, we don't want to import/export these!
DenseSet<GlobalValue::GUID> GUIDPreservedSymbols;
for (auto &Res : GlobalResolutions) {
if (Res.second.VisibleOutsideThinLTO &&
// IRName will be defined if we have seen the prevailing copy of
// this value. If not, no need to preserve any ThinLTO copies.
!Res.second.IRName.empty())
GUIDPreservedSymbols.insert(GlobalValue::getGUID(
GlobalValue::dropLLVMManglingEscape(Res.second.IRName)));
}
computeDeadSymbols(ThinLTO.CombinedIndex, GUIDPreservedSymbols);
// Save the status of having a regularLTO combined module, as
// this is needed for generating the ThinLTO Task ID, and
// the CombinedModule will be moved at the end of runRegularLTO.
@@ -974,19 +987,6 @@ Error LTO::runThinLTO(AddStreamFn AddStream, NativeObjectCache Cache,
StringMap<std::map<GlobalValue::GUID, GlobalValue::LinkageTypes>> ResolvedODR;
if (Conf.OptLevel > 0) {
// Compute "dead" symbols, we don't want to import/export these!
DenseSet<GlobalValue::GUID> GUIDPreservedSymbols;
for (auto &Res : GlobalResolutions) {
if (Res.second.VisibleOutsideThinLTO &&
// IRName will be defined if we have seen the prevailing copy of
// this value. If not, no need to preserve any ThinLTO copies.
!Res.second.IRName.empty())
GUIDPreservedSymbols.insert(GlobalValue::getGUID(
GlobalValue::dropLLVMManglingEscape(Res.second.IRName)));
}
computeDeadSymbols(ThinLTO.CombinedIndex, GUIDPreservedSymbols);
ComputeCrossModuleImport(ThinLTO.CombinedIndex, ModuleToDefinedGVSummaries,
ImportLists, ExportLists);