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Avoid spliting loops where two split condition branches are not independent.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41148 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -711,12 +711,22 @@ bool LoopIndexSplit::splitLoop(SplitInfo &SD) {
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|| Latch == SplitTerminator->getSuccessor(1)))
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return false;
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// If one of the split condition branch is post dominating other then loop
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// index split is not appropriate.
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BasicBlock *Succ0 = SplitTerminator->getSuccessor(0);
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BasicBlock *Succ1 = SplitTerminator->getSuccessor(1);
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if (DT->dominates(Succ0, Latch) || DT->dominates(Succ1, Latch))
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return false;
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// If one of the split condition branch is a predecessor of the other
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// split condition branch head then do not split loop on this condition.
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for(pred_iterator PI = pred_begin(Succ0), PE = pred_end(Succ0); PI != PE; ++PI)
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if (Succ1 == *PI)
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return false;
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for(pred_iterator PI = pred_begin(Succ1), PE = pred_end(Succ1); PI != PE; ++PI)
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if (Succ0 == *PI)
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return false;
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// True loop is original loop. False loop is cloned loop.
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bool SignedPredicate = ExitCondition->isSignedPredicate();
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