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Implement support for varargs functions without any fixed

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parameters in the CBE by implicitly adding a fixed argument.
This allows eliminating a work-around from DAE.  Patch by
Sylvere Teissier!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100944 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-04-10 19:12:44 +00:00
parent 195d2dec10
commit 5106dcd078
2 changed files with 23 additions and 31 deletions
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15
lib/Transforms/IPO/DeadArgumentElimination.cpp
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@@ -694,18 +694,6 @@ bool DAE::RemoveDeadStuffFromFunction(Function *F) {
AttrListPtr NewPAL = AttrListPtr::get(AttributesVec.begin(),
AttributesVec.end());
// Work around LLVM bug PR56: the CWriter cannot emit varargs functions which
// have zero fixed arguments.
//
// Note that we apply this hack for a vararg fuction that does not have any
// arguments anymore, but did have them before (so don't bother fixing
// functions that were already broken wrt CWriter).
bool ExtraArgHack = false;
if (Params.empty() && FTy->isVarArg() && FTy->getNumParams() != 0) {
ExtraArgHack = true;
Params.push_back(Type::getInt32Ty(F->getContext()));
}
// Create the new function type based on the recomputed parameters.
FunctionType *NFTy = FunctionType::get(NRetTy, Params, FTy->isVarArg());
@@ -755,9 +743,6 @@ bool DAE::RemoveDeadStuffFromFunction(Function *F) {
AttributesVec.push_back(AttributeWithIndex::get(Args.size(), Attrs));
}
if (ExtraArgHack)
Args.push_back(UndefValue::get(Type::getInt32Ty(F->getContext())));
// Push any varargs arguments on the list. Don't forget their attributes.
for (CallSite::arg_iterator E = CS.arg_end(); I != E; ++I, ++i) {
Args.push_back(*I);