[PATCH] D28409: Use CodegenOpts::less when creating a TargetMachine for clang `-O1`

[Mehdi AMINI via Phabricator via cfe-commits]

mehdi_amini created this revision.
mehdi_amini added reviewers: echristo, chandlerc.
mehdi_amini added a subscriber: cfe-commits.

Clang was initializing the TargetMachine with CodeGenOpt::Default
for https://reviews.llvm.org/owners/package/1/. 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


https://reviews.llvm.org/D28409

Files:
  clang/lib/CodeGen/BackendUtil.cpp


Index: clang/lib/CodeGen/BackendUtil.cpp
===================================================================
--- clang/lib/CodeGen/BackendUtil.cpp
+++ clang/lib/CodeGen/BackendUtil.cpp
@@ -514,11 +514,14 @@
            .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;


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