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[LTO] Add a "CodeGenOnly" option. Allows the client to skip the optimizer.

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Summary: Slowly getting on par with libLTO

Reviewers: tejohnson

Subscribers: llvm-commits, mehdi_amini

Differential Revision: https://reviews.llvm.org/D23615

llvm-svn: 279416
This commit is contained in:
Mehdi Amini 2016-08-22 06:25:41 +00:00
parent a24c55f53c
commit d00c9cd31e
3 changed files with 32 additions and 21 deletions
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3
include/llvm/LTO/Config.h
View File

@ -52,6 +52,9 @@ struct Config {
unsigned OptLevel = 2;
bool DisableVerify = false;
/// Disable entirely the optimizer, including importing for ThinLTO
bool CodeGenOnly = false;
/// Setting this field will replace target triples in input files with this
/// triple.
std::string OverrideTriple;

40
lib/LTO/LTO.cpp
View File

@ -365,27 +365,29 @@ Error LTO::runRegularLTO(AddOutputFn AddOutput) {
!Conf.PreOptModuleHook(0, *RegularLTO.CombinedModule))
return Error();
for (const auto &R : GlobalResolutions) {
if (R.second.IRName.empty())
continue;
if (R.second.Partition != 0 &&
R.second.Partition != GlobalResolution::External)
continue;
if (!Conf.CodeGenOnly) {
for (const auto &R : GlobalResolutions) {
if (R.second.IRName.empty())
continue;
if (R.second.Partition != 0 &&
R.second.Partition != GlobalResolution::External)
continue;
GlobalValue *GV = RegularLTO.CombinedModule->getNamedValue(R.second.IRName);
// Ignore symbols defined in other partitions.
if (!GV || GV->hasLocalLinkage())
continue;
GV->setUnnamedAddr(R.second.UnnamedAddr ? GlobalValue::UnnamedAddr::Global
: GlobalValue::UnnamedAddr::None);
if (R.second.Partition == 0)
GV->setLinkage(GlobalValue::InternalLinkage);
GlobalValue *GV =
RegularLTO.CombinedModule->getNamedValue(R.second.IRName);
// Ignore symbols defined in other partitions.
if (!GV || GV->hasLocalLinkage())
continue;
GV->setUnnamedAddr(R.second.UnnamedAddr ? GlobalValue::UnnamedAddr::Global
: GlobalValue::UnnamedAddr::None);
if (R.second.Partition == 0)
GV->setLinkage(GlobalValue::InternalLinkage);
}
if (Conf.PostInternalizeModuleHook &&
!Conf.PostInternalizeModuleHook(0, *RegularLTO.CombinedModule))
return Error();
}
if (Conf.PostInternalizeModuleHook &&
!Conf.PostInternalizeModuleHook(0, *RegularLTO.CombinedModule))
return Error();
return backend(Conf, AddOutput, RegularLTO.ParallelCodeGenParallelismLevel,
std::move(RegularLTO.CombinedModule));
}

10
lib/LTO/LTOBackend.cpp
View File

@ -224,8 +224,9 @@ Error lto::backend(Config &C, AddOutputFn AddOutput,
std::unique_ptr<TargetMachine> TM =
createTargetMachine(C, M->getTargetTriple(), *TOrErr);
if (!opt(C, TM.get(), 0, *M, /*IsThinLto=*/false))
return Error();
if (!C.CodeGenOnly)
if (!opt(C, TM.get(), 0, *M, /*IsThinLto=*/false))
return Error();
if (ParallelCodeGenParallelismLevel == 1)
codegen(C, TM.get(), AddOutput, 0, *M);
@ -247,6 +248,11 @@ Error lto::thinBackend(Config &Conf, unsigned Task, AddOutputFn AddOutput,
std::unique_ptr<TargetMachine> TM =
createTargetMachine(Conf, Mod.getTargetTriple(), *TOrErr);
if (Conf.CodeGenOnly) {
codegen(Conf, TM.get(), AddOutput, Task, Mod);
return Error();
}
if (Conf.PreOptModuleHook && !Conf.PreOptModuleHook(Task, Mod))
return Error();