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add a comment, make a check more lenient
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22581 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -71,6 +71,9 @@ namespace {
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const TargetData *TD;
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const Type *UIntPtrTy;
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bool Changed;
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/// MaxTargetAMSize - This is the maximum power-of-two scale value that the
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/// target can handle for free with its addressing modes.
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unsigned MaxTargetAMSize;
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/// IVUsesByStride - Keep track of all uses of induction variables that we
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@ -649,15 +652,14 @@ void LoopStrengthReduce::runOnLoop(Loop *L) {
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// compared against some value to decide loop termination.
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if (PN->hasOneUse()) {
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BinaryOperator *BO = dyn_cast<BinaryOperator>(*(PN->use_begin()));
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if (BO && BO->getOpcode() == Instruction::Add)
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if (BO->hasOneUse()) {
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if (PN == dyn_cast<PHINode>(*(BO->use_begin()))) {
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DeadInsts.insert(BO);
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// Break the cycle, then delete the PHI.
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PN->replaceAllUsesWith(UndefValue::get(PN->getType()));
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PN->eraseFromParent();
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}
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if (BO && BO->hasOneUse()) {
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if (PN == *(BO->use_begin())) {
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DeadInsts.insert(BO);
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// Break the cycle, then delete the PHI.
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PN->replaceAllUsesWith(UndefValue::get(PN->getType()));
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PN->eraseFromParent();
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}
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}
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}
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}
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DeleteTriviallyDeadInstructions(DeadInsts);
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