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Restrict InstCombine from converting varargs to or from fixed args.

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More targetted fix replacing d0e277d272d517ca1cda368267d199f0da7cad95.

llvm-svn: 149648
This commit is contained in:
Jim Grosbach 2012-02-03 00:00:55 +00:00
parent bc7e9b3c96
commit 12f2a6322e
1 changed files with 7 additions and 0 deletions
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7
lib/Transforms/InstCombine/InstCombineCalls.cpp
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@ -1104,6 +1104,13 @@ bool InstCombiner::transformConstExprCastCall(CallSite CS) {
PointerType *APTy = cast<PointerType>(CS.getCalledValue()->getType());
if (FT->isVarArg()!=cast<FunctionType>(APTy->getElementType())->isVarArg())
return false;
// If both the callee and the cast type are varargs, we still have to make
// sure the number of fixed parameters are the same or we have the same
// ABI issues as if we introduce a varargs call.
if (FT->getNumParams() !=
cast<FunctionType>(APTy->getElementType())->getNumParams())
return false;
}
if (FT->getNumParams() < NumActualArgs && FT->isVarArg() &&