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Use CodegenOpts::less when creating a TargetMachine for clang `-O1` 

Summary:
Clang was initializing the TargetMachine with CodeGenOpt::Default
for O1. This change is aligning it on llc:

-O0: OptLevel = CodeGenOpt::None
-O1: OptLevel = CodeGenOpt::Less
-O2 -Os -Oz: OptLevel = CodeGenOpt::Default
-O3: OptLevel = CodeGenOpt::Aggressive

Reviewers: echristo, chandlerc

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D28409

llvm-svn: 291276
This commit is contained in:
Mehdi Amini 2017-01-06 20:52:30 +00:00
parent 00f6beaed4
commit a7276feed7
1 changed files with 15 additions and 4 deletions
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19
clang/lib/CodeGen/BackendUtil.cpp
View File

@ -519,11 +519,22 @@ void EmitAssemblyHelper::CreateTargetMachine(bool MustCreateTM) {
.Case("dynamic-no-pic", llvm::Reloc::DynamicNoPIC);
assert(RM.hasValue() && "invalid PIC model!");
CodeGenOpt::Level OptLevel = CodeGenOpt::Default;
CodeGenOpt::Level OptLevel;
switch (CodeGenOpts.OptimizationLevel) {
default: break;
case 0: OptLevel = CodeGenOpt::None; break;
case 3: OptLevel = CodeGenOpt::Aggressive; break;
default:
llvm_unreachable("Invalid optimization level!");
case 0:
OptLevel = CodeGenOpt::None;
break;
case 1:
OptLevel = CodeGenOpt::Less;
break;
case 2:
OptLevel = CodeGenOpt::Default;
break; // O2/Os/Oz
case 3:
OptLevel = CodeGenOpt::Aggressive;
break;
}
llvm::TargetOptions Options;