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Fix bug: InstCombine/cast.ll:test11 / PR#7

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8954 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2003-10-07 22:54:13 +00:00
parent d1c5ea1071
commit 6c266db54c
1 changed files with 23 additions and 1 deletions
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24
lib/Transforms/Scalar/InstructionCombining.cpp
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@@ -1607,10 +1607,32 @@ static const Type *getPromotedType(const Type *Ty) {
// visitCallSite - Improvements for call and invoke instructions. // visitCallSite - Improvements for call and invoke instructions.
// //
Instruction *InstCombiner::visitCallSite(CallSite CS) { Instruction *InstCombiner::visitCallSite(CallSite CS) {
bool Changed = false;
// If the callee is a constexpr cast of a function, attempt to move the cast
// to the arguments of the call/invoke.
if (transformConstExprCastCall(CS)) return 0; if (transformConstExprCastCall(CS)) return 0;
Value *Callee = CS.getCalledValue();
const PointerType *PTy = cast<PointerType>(Callee->getType());
const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
if (FTy->isVarArg()) {
// See if we can optimize any arguments passed through the varargs area of
// the call.
for (CallSite::arg_iterator I = CS.arg_begin()+FTy->getNumParams(),
E = CS.arg_end(); I != E; ++I)
if (CastInst *CI = dyn_cast<CastInst>(*I)) {
// If this cast does not effect the value passed through the varargs
// area, we can eliminate the use of the cast.
Value *Op = CI->getOperand(0);
if (CI->getType()->isLosslesslyConvertibleTo(Op->getType())) {
*I = Op;
Changed = true;
}
}
}
return 0; return Changed ? CS.getInstruction() : 0;
} }
// transformConstExprCastCall - If the callee is a constexpr cast of a function, // transformConstExprCastCall - If the callee is a constexpr cast of a function,