Set PIELevel module flag

[tmsriram]

Summary

In patch http://reviews.llvm.org/D19671, I added a patch to create PIELevel module flag. This patch sets the flag.

[rnk]

lgtm

lib/CodeGen/CodeGenModule.cpp

490–496

This seems simpler as:

assert(PLevel < 3 && "invalid PIE level");
getModule().setPIELevel(static_cast<llvm::PIELevel::Level>(PLevel));

[tmsriram]

Simplify code setting PICLevel and PIELevel module flags.

[rnk]

still lgtm

lib/CodeGen/CodeGenModule.cpp

480

formatting nit: no space between 'assert' and '('

[tmsriram]

267948

lib/CodeGen/CodeGenModule.cpp

if (LangOpts.CUDAIsDevice && getTarget().getTriple().isNVPTX()) {
     // Indicate whether __nvvm_reflect should be configured to flush denormal
     // floating point values to 0.  (This corresponds to its "__CUDA_FTZ"
     // property.)
     getModule().addModuleFlag(llvm::Module::Override, "nvvm-reflect-ftz",
                               LangOpts.CUDADeviceFlushDenormalsToZero ? 1 : 0);
   }
 
   if (uint32_t PLevel = Context.getLangOpts().PICLevel) {
-    llvm::PICLevel::Level PL = llvm::PICLevel::Default;
-    switch (PLevel) {
-    case 0: break;
-    case 1: PL = llvm::PICLevel::Small; break;
-    case 2: PL = llvm::PICLevel::Large; break;
-    default: llvm_unreachable("Invalid PIC Level");
-    }
+    assert (PLevel < 3 && "Invalid PIC Level");
+    getModule().setPICLevel(static_cast<llvm::PICLevel::Level>(PLevel));
 
-    getModule().setPICLevel(PL);
+  if (uint32_t PLevel = Context.getLangOpts().PIELevel) {
+    assert (PLevel < 3 && "Invalid PIE Level");
+    getModule().setPIELevel(static_cast<llvm::PIELevel::Level>(PLevel));
   }
 
   SimplifyPersonality();
 
   if (getCodeGenOpts().EmitDeclMetadata)
     EmitDeclMetadata();
 
   if (getCodeGenOpts().EmitGcovArcs || getCodeGenOpts().EmitGcovNotes)
     EmitCoverageFile();
 
   if (DebugInfo)
     DebugInfo->finalize();
 
   EmitVersionIdentMetadata();
 
   EmitTargetMetadata();
 }