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mplement a theoretical fixme. 

llvm-svn: 93024
This commit is contained in:
Chris Lattner 2010-01-08 19:28:47 +00:00
parent b3ed45b67c
commit 9242ae047c
1 changed files with 7 additions and 3 deletions
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10
llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
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@ -476,9 +476,13 @@ static unsigned CanEvaluateSExtd(Value *V, const Type *Ty,
/// insert the code to evaluate the expression.
Value *InstCombiner::EvaluateInDifferentType(Value *V, const Type *Ty,
bool isSigned) {
// FIXME: use libanalysis constant folding.
if (Constant *C = dyn_cast<Constant>(V))
return ConstantExpr::getIntegerCast(C, Ty, isSigned /*Sext or ZExt*/);
if (Constant *C = dyn_cast<Constant>(V)) {
C = ConstantExpr::getIntegerCast(C, Ty, isSigned /*Sext or ZExt*/);
// If we got a constantexpr back, try to simplify it with TD info.
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
C = ConstantFoldConstantExpression(CE, TD);
return C;
}
// Otherwise, it must be an instruction.
Instruction *I = cast<Instruction>(V);