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Fix PR284: [indvars] Induction variable analysis violates LLVM invariants
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12275 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -136,10 +136,14 @@ InductionVariable::InductionVariable(PHINode *P, LoopInfo *LoopInfo): End(0) {
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if (Constant *CV = dyn_cast<Constant>(V))
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Step = ConstantExpr::get(Instruction::Sub, Zero, CV);
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else if (Instruction *I = dyn_cast<Instruction>(V)) {
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BasicBlock::iterator InsertPt = I;
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for (++InsertPt; isa<PHINode>(InsertPt); ++InsertPt)
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/*empty*/;
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Step = BinaryOperator::create(Instruction::Sub, Zero, V,
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V->getName()+".neg", I->getNext());
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V->getName()+".neg", InsertPt);
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} else {
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// Must be loop invariant
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Step = BinaryOperator::create(Instruction::Sub, Zero, V,
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V->getName()+".neg",
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Phi->getParent()->getParent()->begin()->begin());
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