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Fix PR284: [indvars] Induction variable analysis violates LLVM invariants 

llvm-svn: 12275
This commit is contained in:
Chris Lattner 2004-03-10 21:42:19 +00:00
parent 6fdbd60ed6
commit 61f57617d7
1 changed files with 5 additions and 1 deletions
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6
llvm/lib/Analysis/InductionVariable.cpp
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@ -136,10 +136,14 @@ InductionVariable::InductionVariable(PHINode *P, LoopInfo *LoopInfo): End(0) {
if (Constant *CV = dyn_cast<Constant>(V))
Step = ConstantExpr::get(Instruction::Sub, Zero, CV);
else if (Instruction *I = dyn_cast<Instruction>(V)) {
BasicBlock::iterator InsertPt = I;
for (++InsertPt; isa<PHINode>(InsertPt); ++InsertPt)
/*empty*/;
Step = BinaryOperator::create(Instruction::Sub, Zero, V,
V->getName()+".neg", I->getNext());
V->getName()+".neg", InsertPt);
} else {
// Must be loop invariant
Step = BinaryOperator::create(Instruction::Sub, Zero, V,
V->getName()+".neg",
Phi->getParent()->getParent()->begin()->begin());