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Handle comparisons of gep instructions that have different typed indices 

as long as they are the same size.

llvm-svn: 19734
This commit is contained in:
Chris Lattner 2005-01-21 23:06:49 +00:00
parent e70eb9da7d
commit fc4429e7c1
1 changed files with 9 additions and 5 deletions
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14
llvm/lib/Transforms/Scalar/InstructionCombining.cpp
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@ -2244,9 +2244,9 @@ Instruction *InstCombiner::FoldGEPSetCC(User *GEPLHS, Value *RHS,
unsigned DiffOperand = 0; // The operand that differs.
for (unsigned i = 1, e = GEPRHS->getNumOperands(); i != e; ++i)
if (GEPLHS->getOperand(i) != GEPRHS->getOperand(i)) {
if (GEPLHS->getOperand(i)->getType() !=
GEPRHS->getOperand(i)->getType()) {
// Irreconsilable differences.
if (GEPLHS->getOperand(i)->getType()->getPrimitiveSize() !=
GEPRHS->getOperand(i)->getType()->getPrimitiveSize()) {
// Irreconcilable differences.
NumDifferences = 2;
break;
} else {
@ -2259,8 +2259,12 @@ Instruction *InstCombiner::FoldGEPSetCC(User *GEPLHS, Value *RHS,
return ReplaceInstUsesWith(I, // No comparison is needed here.
ConstantBool::get(Cond == Instruction::SetEQ));
else if (NumDifferences == 1) {
return new SetCondInst(Cond, GEPLHS->getOperand(DiffOperand),
GEPRHS->getOperand(DiffOperand));
Value *LHSV = GEPLHS->getOperand(DiffOperand);
Value *RHSV = GEPRHS->getOperand(DiffOperand);
if (LHSV->getType() != RHSV->getType())
LHSV = InsertNewInstBefore(new CastInst(LHSV, RHSV->getType(),
LHSV->getName()+".c"), I);
return new SetCondInst(Cond, LHSV, RHSV);
}
}