diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp b/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp index f1599c361ff..ad4e0e2b815 100644 --- a/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp +++ b/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp @@ -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 |
