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If we have an add, do it in the pointer realm, not the int realm. This is critical in the linux kernel for pointer analysis correctness

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llvm-svn: 30496
This commit is contained in:
Andrew Lenharth 2006-09-19 18:24:51 +00:00
parent 17889b837e
commit 0240d56eb6
1 changed files with 22 additions and 0 deletions
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22
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -1595,6 +1595,28 @@ FoundSExt:
return R;
}
// add (cast *A to intptrtype) B -> cast (GEP (cast *A to sbyte*) B) -> intptrtype
{
CastInst* CI = dyn_cast<CastInst>(LHS);
Value* Other = RHS;
if (!CI) {
CI = dyn_cast<CastInst>(RHS);
Other = LHS;
}
if (CI) {
const Type *UIntPtrTy = TD->getIntPtrType();
const Type *SIntPtrTy = UIntPtrTy->getSignedVersion();
if((CI->getType() == UIntPtrTy || CI->getType() == SIntPtrTy)
&& isa<PointerType>(CI->getOperand(0)->getType())) {
Instruction* I2 = new CastInst(CI->getOperand(0), PointerType::get(Type::SByteTy), "ctg", &I);
WorkList.push_back(I2);
I2 = new GetElementPtrInst(I2, Other, "ctg", &I);
WorkList.push_back(I2);
return new CastInst(I2, CI->getType());
}
}
}
return Changed ? &I : 0;
}