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Add support for external calls that we know how to constant fold. This implements 

ctor-list-opt.ll:CTOR8

llvm-svn: 23465
This commit is contained in:
Chris Lattner 2005-09-27 05:02:43 +00:00
parent 1f1fd227fb
commit 3d27e7f27f
1 changed files with 20 additions and 11 deletions
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29
llvm/lib/Transforms/IPO/GlobalOpt.cpp
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@ -1451,20 +1451,29 @@ static bool EvaluateFunction(Function *F, Constant *&RetVal,
Function *Callee = dyn_cast<Function>(getVal(Values, CI->getOperand(0)));
if (!Callee) return false; // Cannot resolve.
if (Callee->isExternal() || Callee->getFunctionType()->isVarArg()) {
return false; // TODO: Constant fold calls.
}
std::vector<Constant*> Formals;
for (unsigned i = 1, e = CI->getNumOperands(); i != e; ++i)
Formals.push_back(getVal(Values, CI->getOperand(i)));
Constant *RetVal;
// Execute the call, if successful, use the return value.
if (!EvaluateFunction(Callee, RetVal, Formals, CallStack,
MutatedMemory, AllocaTmps))
return false;
InstResult = RetVal;
if (Callee->isExternal()) {
// If this is a function we can constant fold, do it.
if (Constant *C = ConstantFoldCall(Callee, Formals)) {
InstResult = C;
} else {
return false;
}
} else {
if (Callee->getFunctionType()->isVarArg())
return false;
Constant *RetVal;
// Execute the call, if successful, use the return value.
if (!EvaluateFunction(Callee, RetVal, Formals, CallStack,
MutatedMemory, AllocaTmps))
return false;
InstResult = RetVal;
}
} else if (TerminatorInst *TI = dyn_cast<TerminatorInst>(CurInst)) {
BasicBlock *NewBB = 0;
if (BranchInst *BI = dyn_cast<BranchInst>(CurInst)) {