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libLTO, llvm-lto, gold: Introduce flag for controlling optimization level.

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This change also introduces a link-time optimization level of 1. This
optimization level runs only the globaldce pass as well as cleanup passes for
passes that run at -O0, specifically simplifycfg which cleans up lowerbitsets.

http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20150316/266951.html

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232769 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne
2015-03-19 22:01:00 +00:00
parent 0dda07ad4d
commit 416d8ecf80
10 changed files with 151 additions and 53 deletions
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32
lib/LTO/LTOCodeGenerator.cpp
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@ -71,7 +71,7 @@ LTOCodeGenerator::LTOCodeGenerator()
LTOCodeGenerator::LTOCodeGenerator(std::unique_ptr<LLVMContext> Context)
: OwnedContext(std::move(Context)), Context(*OwnedContext),
IRLinker(new Module("ld-temp.o", *OwnedContext)) {
IRLinker(new Module("ld-temp.o", *OwnedContext)), OptLevel(2) {
initialize();
}
@ -291,12 +291,11 @@ const void *LTOCodeGenerator::compileOptimized(size_t *length,
bool LTOCodeGenerator::compile_to_file(const char **name,
bool disableOpt,
bool disableInline,
bool disableGVNLoadPRE,
bool disableVectorization,
std::string &errMsg) {
if (!optimize(disableOpt, disableInline, disableGVNLoadPRE,
if (!optimize(disableInline, disableGVNLoadPRE,
disableVectorization, errMsg))
return false;
@ -304,12 +303,11 @@ bool LTOCodeGenerator::compile_to_file(const char **name,
}
const void* LTOCodeGenerator::compile(size_t *length,
bool disableOpt,
bool disableInline,
bool disableGVNLoadPRE,
bool disableVectorization,
std::string &errMsg) {
if (!optimize(disableOpt, disableInline, disableGVNLoadPRE,
if (!optimize(disableInline, disableGVNLoadPRE,
disableVectorization, errMsg))
return nullptr;
@ -363,9 +361,25 @@ bool LTOCodeGenerator::determineTarget(std::string &errMsg) {
MCpu = "cyclone";
}
CodeGenOpt::Level CGOptLevel;
switch (OptLevel) {
case 0:
CGOptLevel = CodeGenOpt::None;
break;
case 1:
CGOptLevel = CodeGenOpt::Less;
break;
case 2:
CGOptLevel = CodeGenOpt::Default;
break;
case 3:
CGOptLevel = CodeGenOpt::Aggressive;
break;
}
TargetMach = march->createTargetMachine(TripleStr, MCpu, FeatureStr, Options,
RelocModel, CodeModel::Default,
CodeGenOpt::Aggressive);
CGOptLevel);
return true;
}
@ -512,8 +526,7 @@ void LTOCodeGenerator::applyScopeRestrictions() {
}
/// Optimize merged modules using various IPO passes
bool LTOCodeGenerator::optimize(bool DisableOpt,
bool DisableInline,
bool LTOCodeGenerator::optimize(bool DisableInline,
bool DisableGVNLoadPRE,
bool DisableVectorization,
std::string &errMsg) {
@ -542,8 +555,7 @@ bool LTOCodeGenerator::optimize(bool DisableOpt,
if (!DisableInline)
PMB.Inliner = createFunctionInliningPass();
PMB.LibraryInfo = new TargetLibraryInfoImpl(TargetTriple);
if (DisableOpt)
PMB.OptLevel = 0;
PMB.OptLevel = OptLevel;
PMB.VerifyInput = true;
PMB.VerifyOutput = true;