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Handle comparisons of gep instructions that have different typed indices
as long as they are the same size. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19734 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2244,9 +2244,9 @@ Instruction *InstCombiner::FoldGEPSetCC(User *GEPLHS, Value *RHS,
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unsigned DiffOperand = 0; // The operand that differs.
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for (unsigned i = 1, e = GEPRHS->getNumOperands(); i != e; ++i)
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if (GEPLHS->getOperand(i) != GEPRHS->getOperand(i)) {
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if (GEPLHS->getOperand(i)->getType() !=
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GEPRHS->getOperand(i)->getType()) {
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// Irreconsilable differences.
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if (GEPLHS->getOperand(i)->getType()->getPrimitiveSize() !=
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GEPRHS->getOperand(i)->getType()->getPrimitiveSize()) {
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// Irreconcilable differences.
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NumDifferences = 2;
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break;
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} else {
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@ -2259,8 +2259,12 @@ Instruction *InstCombiner::FoldGEPSetCC(User *GEPLHS, Value *RHS,
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return ReplaceInstUsesWith(I, // No comparison is needed here.
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ConstantBool::get(Cond == Instruction::SetEQ));
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else if (NumDifferences == 1) {
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return new SetCondInst(Cond, GEPLHS->getOperand(DiffOperand),
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GEPRHS->getOperand(DiffOperand));
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Value *LHSV = GEPLHS->getOperand(DiffOperand);
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Value *RHSV = GEPRHS->getOperand(DiffOperand);
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if (LHSV->getType() != RHSV->getType())
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LHSV = InsertNewInstBefore(new CastInst(LHSV, RHSV->getType(),
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LHSV->getName()+".c"), I);
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return new SetCondInst(Cond, LHSV, RHSV);
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}
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}
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