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Remove special casing of pointers and treat them generically as integers of 

the appopriate size.  This gives us the ability to eliminate int -> ptr -> int

llvm-svn: 15063
This commit is contained in:
Chris Lattner 2004-07-21 04:27:24 +00:00
parent fdcf624939
commit 4fbad968f8
1 changed files with 5 additions and 8 deletions
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13
llvm/lib/Transforms/Scalar/InstructionCombining.cpp
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@ -1974,14 +1974,11 @@ static inline bool isEliminableCastOfCast(const Type *SrcTy, const Type *MidTy,
if (SrcTy == DstTy && SrcTy->isLosslesslyConvertibleTo(MidTy))
return true;
// If the source and destination types are pointer types, and the intermediate
// is an integer type bigger than a pointer, eliminate the casts.
if (isa<PointerType>(SrcTy) && isa<PointerType>(DstTy)) {
if (isa<PointerType>(MidTy)) return true;
if (MidTy->isInteger() && MidTy->getPrimitiveSize() >= TD->getPointerSize())
return true;
}
// If we are casting between pointer and integer types, treat pointers as
// integers of the appropriate size for the code below.
if (isa<PointerType>(SrcTy)) SrcTy = TD->getIntPtrType();
if (isa<PointerType>(MidTy)) MidTy = TD->getIntPtrType();
if (isa<PointerType>(DstTy)) DstTy = TD->getIntPtrType();
// Allow free casting and conversion of sizes as long as the sign doesn't
// change...