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ConstantFoldConstantExpression can theoretically return null. 

llvm-svn: 104948
This commit is contained in:
Dan Gohman 2010-05-28 16:12:08 +00:00
parent 4412c9c551
commit a3b6c4b529
1 changed files with 8 additions and 4 deletions
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12
llvm/lib/Analysis/ScalarEvolution.cpp
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@ -2278,7 +2278,8 @@ const SCEV *ScalarEvolution::getSizeOfExpr(const Type *AllocTy) {
Constant *C = ConstantExpr::getSizeOf(AllocTy);
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
C = ConstantFoldConstantExpression(CE, TD);
if (Constant *Folded = ConstantFoldConstantExpression(CE, TD))
C = Folded;
const Type *Ty = getEffectiveSCEVType(PointerType::getUnqual(AllocTy));
return getTruncateOrZeroExtend(getSCEV(C), Ty);
}
@ -2286,7 +2287,8 @@ const SCEV *ScalarEvolution::getSizeOfExpr(const Type *AllocTy) {
const SCEV *ScalarEvolution::getAlignOfExpr(const Type *AllocTy) {
Constant *C = ConstantExpr::getAlignOf(AllocTy);
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
C = ConstantFoldConstantExpression(CE, TD);
if (Constant *Folded = ConstantFoldConstantExpression(CE, TD))
C = Folded;
const Type *Ty = getEffectiveSCEVType(PointerType::getUnqual(AllocTy));
return getTruncateOrZeroExtend(getSCEV(C), Ty);
}
@ -2302,7 +2304,8 @@ const SCEV *ScalarEvolution::getOffsetOfExpr(const StructType *STy,
Constant *C = ConstantExpr::getOffsetOf(STy, FieldNo);
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
C = ConstantFoldConstantExpression(CE, TD);
if (Constant *Folded = ConstantFoldConstantExpression(CE, TD))
C = Folded;
const Type *Ty = getEffectiveSCEVType(PointerType::getUnqual(STy));
return getTruncateOrZeroExtend(getSCEV(C), Ty);
}
@ -2311,7 +2314,8 @@ const SCEV *ScalarEvolution::getOffsetOfExpr(const Type *CTy,
Constant *FieldNo) {
Constant *C = ConstantExpr::getOffsetOf(CTy, FieldNo);
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
C = ConstantFoldConstantExpression(CE, TD);
if (Constant *Folded = ConstantFoldConstantExpression(CE, TD))
C = Folded;
const Type *Ty = getEffectiveSCEVType(PointerType::getUnqual(CTy));
return getTruncateOrZeroExtend(getSCEV(C), Ty);
}