diff options
| -rw-r--r-- | lib/VMCore/ConstantFold.cpp | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/lib/VMCore/ConstantFold.cpp b/lib/VMCore/ConstantFold.cpp index 36cc13cf55..8da98f1997 100644 --- a/lib/VMCore/ConstantFold.cpp +++ b/lib/VMCore/ConstantFold.cpp @@ -461,9 +461,21 @@ struct DirectIntRules : public DirectRules<ConstantClass, BuiltinType, Ty, DirectIntRules<ConstantClass, BuiltinType, Ty> > { + static Constant *Div(const ConstantClass *V1, const ConstantClass *V2) { + if (V2->isNullValue()) return 0; + if (V2->isAllOnesValue() && // MIN_INT / -1 + (BuiltinType)V1->getValue() == -(BuiltinType)V1->getValue()) + return 0; + BuiltinType R = (BuiltinType)V1->getValue() / (BuiltinType)V2->getValue(); + return ConstantClass::get(*Ty, R); + } + static Constant *Rem(const ConstantClass *V1, const ConstantClass *V2) { - if (V2->isNullValue()) return 0; + if (V2->isNullValue()) return 0; // X / 0 + if (V2->isAllOnesValue() && // MIN_INT / -1 + (BuiltinType)V1->getValue() == -(BuiltinType)V1->getValue()) + return 0; BuiltinType R = (BuiltinType)V1->getValue() % (BuiltinType)V2->getValue(); return ConstantClass::get(*Ty, R); } |