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Implement constant propogation of shifts 

llvm-svn: 2470
This commit is contained in:
Chris Lattner 2002-05-06 03:00:54 +00:00
parent b2f02e5952
commit 6670d86b0b
1 changed files with 28 additions and 0 deletions
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28
llvm/lib/VMCore/ConstantHandling.cpp
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@ -56,6 +56,14 @@ class TemplateRules : public ConstRules {
const Constant *V2) const {
return SubClassName::Rem((const ArgType *)V1, (const ArgType *)V2);
}
virtual Constant *shl(const Constant *V1,
const Constant *V2) const {
return SubClassName::Shl((const ArgType *)V1, (const ArgType *)V2);
}
virtual Constant *shr(const Constant *V1,
const Constant *V2) const {
return SubClassName::Shr((const ArgType *)V1, (const ArgType *)V2);
}
virtual ConstantBool *lessthan(const Constant *V1,
const Constant *V2) const {
@ -122,6 +130,12 @@ class TemplateRules : public ConstRules {
inline static Constant *Rem(const ArgType *V1, const ArgType *V2) {
return 0;
}
inline static Constant *Shl(const ArgType *V1, const ArgType *V2) {
return 0;
}
inline static Constant *Shr(const ArgType *V1, const ArgType *V2) {
return 0;
}
inline static ConstantBool *LessThan(const ArgType *V1, const ArgType *V2) {
return 0;
}
@ -337,6 +351,20 @@ struct DirectIntRules
(BuiltinType)V2->getValue();
return ConstantClass::get(*Ty, Result);
}
inline static Constant *Shl(const ConstantClass *V1,
const ConstantClass *V2) {
BuiltinType Result = (BuiltinType)V1->getValue() <<
(BuiltinType)V2->getValue();
return ConstantClass::get(*Ty, Result);
}
inline static Constant *Shr(const ConstantClass *V1,
const ConstantClass *V2) {
BuiltinType Result = (BuiltinType)V1->getValue() >>
(BuiltinType)V2->getValue();
return ConstantClass::get(*Ty, Result);
}
};