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Make sure the immediate dominator isn't NULL through iterations
of the loop. We could get to this condition via indirect branches. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91009 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -160,16 +160,17 @@ namespace {
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// Because the exit block is not in the loop, we know we have to get _at
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// least_ its immediate dominator.
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do {
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// Get next Immediate Dominator.
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IDom = IDom->getIDom();
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IDom = IDom->getIDom();
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while (IDom && IDom != BlockInLoopNode) {
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// If we have got to the header of the loop, then the instructions block
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// did not dominate the exit node, so we can't hoist it.
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if (IDom->getBlock() == LoopHeader)
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return false;
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} while (IDom != BlockInLoopNode);
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// Get next Immediate Dominator.
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IDom = IDom->getIDom();
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};
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return true;
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}
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