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Delete dead code. sext and zext can not turn integers into pointers. Further, 

the optimization described in the comment is only valid with target data.

llvm-svn: 82353
This commit is contained in:
Nick Lewycky 2009-09-20 02:11:47 +00:00
parent 5a3fa4ef33
commit 595b3dfcbe
1 changed files with 0 additions and 15 deletions
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15
llvm/lib/VMCore/ConstantFold.cpp
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@ -1248,21 +1248,6 @@ static ICmpInst::Predicate evaluateICmpRelation(LLVMContext &Context,
Constant::getNullValue(CE1Op0->getType()),
sgnd);
}
// If the dest type is a pointer type, and the RHS is a constantexpr cast
// from the same type as the src of the LHS, evaluate the inputs. This is
// important for things like "icmp eq (cast 4 to int*), (cast 5 to int*)",
// which happens a lot in compilers with tagged integers.
if (ConstantExpr *CE2 = dyn_cast<ConstantExpr>(V2))
if (CE2->isCast() && isa<PointerType>(CE1->getType()) &&
CE1->getOperand(0)->getType() == CE2->getOperand(0)->getType() &&
CE1->getOperand(0)->getType()->isInteger()) {
bool sgnd = isSigned;
if (CE1->getOpcode() == Instruction::ZExt) isSigned = false;
if (CE1->getOpcode() == Instruction::SExt) isSigned = true;
return evaluateICmpRelation(Context, CE1->getOperand(0),
CE2->getOperand(0), sgnd);
}
break;
case Instruction::GetElementPtr: