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Update chunk of #if 0'ed code to remove fixed FIXME and make it compile. We 

probably want to do some sort of performance assessment before enabling it,
though.

llvm-svn: 90510
This commit is contained in:
Eli Friedman 2009-12-04 01:30:56 +00:00
parent 43d4a899c4
commit 6d11ec8cb8
1 changed files with 6 additions and 11 deletions
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17
clang/lib/CodeGen/CGExprAgg.cpp
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@ -502,21 +502,16 @@ void AggExprEmitter::EmitNullInitializationToLValue(LValue LV, QualType T) {
void AggExprEmitter::VisitInitListExpr(InitListExpr *E) {
#if 0
// FIXME: Disabled while we figure out what to do about
// test/CodeGen/bitfield.c
// FIXME: Assess perf here? Figure out what cases are worth optimizing here
// (Length of globals? Chunks of zeroed-out space?).
//
// If we can, prefer a copy from a global; this is a lot less code for long
// globals, and it's easier for the current optimizers to analyze.
// FIXME: Should we really be doing this? Should we try to avoid cases where
// we emit a global with a lot of zeros? Should we try to avoid short
// globals?
if (E->isConstantInitializer(CGF.getContext(), 0)) {
llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, &CGF);
if (llvm::Constant* C = CGF.CGM.EmitConstantExpr(E, E->getType(), &CGF)) {
llvm::GlobalVariable* GV =
new llvm::GlobalVariable(C->getType(), true,
llvm::GlobalValue::InternalLinkage,
C, "", &CGF.CGM.getModule(), 0);
EmitFinalDestCopy(E, LValue::MakeAddr(GV, 0));
new llvm::GlobalVariable(CGF.CGM.getModule(), C->getType(), true,
llvm::GlobalValue::InternalLinkage, C, "");
EmitFinalDestCopy(E, LValue::MakeAddr(GV, Qualifiers()));
return;
}
#endif