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Do not generate LLVM IR for available_externally function bodies at

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-O0, since we won't be using the definitions for anything anyway. For
lib/System/Path.o when built in Debug+Asserts mode, this leads to a 4%
improvement in compile time (and suppresses 440 function bodies).

<rdar://problem/7987644>

llvm-svn: 108156
This commit is contained in:
Douglas Gregor
2010-07-12 17:24:55 +00:00
parent 4be8f2ffad
commit dbb2806a7b
7 changed files with 33 additions and 13 deletions
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18
clang/lib/CodeGen/CodeGenModule.cpp
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@@ -817,14 +817,22 @@ void CodeGenModule::EmitGlobalDefinition(GlobalDecl GD) {
if (Method->isVirtual())
getVTables().EmitThunks(GD);
if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D))
return EmitCXXConstructor(CD, GD.getCtorType());
if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) {
// At -O0, don't generate IR for functions with available_externally
// linkage.
if (CodeGenOpts.OptimizationLevel == 0 &&
getFunctionLinkage(Function)
== llvm::Function::AvailableExternallyLinkage)
return;
if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(Function))
return EmitCXXConstructor(CD, GD.getCtorType());
if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(D))
return EmitCXXDestructor(DD, GD.getDtorType());
if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(Function))
return EmitCXXDestructor(DD, GD.getDtorType());
if (isa<FunctionDecl>(D))
return EmitGlobalFunctionDefinition(GD);
}
if (const VarDecl *VD = dyn_cast<VarDecl>(D))
return EmitGlobalVarDefinition(VD);