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Handle arguments passed in through the va_arg area 

llvm-svn: 6769
This commit is contained in:
Chris Lattner 2003-06-18 16:25:51 +00:00
parent d768c51f1b
commit 5d3c145d4e
1 changed files with 7 additions and 1 deletions
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8
llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
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@ -79,7 +79,13 @@ static ArgumentLiveness getArgumentLiveness(const Argument &A) {
Function *Callee = CS.getCalledFunction();
if (!Callee) return Alive;
// FIXME: check to see if it's passed through a va_arg area
// Check to see if it's passed through a va_arg area: if so, we cannot
// remove it.
unsigned NumFixedArgs = Callee->getFunctionType()->getNumParams();
for (CallSite::arg_iterator AI = CS.arg_begin()+NumFixedArgs;
AI != CS.arg_end(); ++AI)
if (AI->get() == &A) // If passed through va_arg area, we cannot remove it
return Alive;
}
return MaybeLive; // It must be used, but only as argument to a function