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SDAGBuilder: Don't create an invalid iterator when there is only one switch case.

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Found by libstdc++'s debug mode.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157522 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2012-05-26 21:19:12 +00:00
parent c511b2a5a1
commit 5db954dab9
1 changed files with 2 additions and 2 deletions
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4
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -1984,10 +1984,10 @@ bool SelectionDAGBuilder::handleSmallSwitchRange(CaseRec& CR,
}
}
}
// Rearrange the case blocks so that the last one falls through if possible.
Case &BackCase = *(CR.Range.second-1);
if (NextBlock && Default != NextBlock && BackCase.BB != NextBlock) {
if (Size > 1 &&
NextBlock && Default != NextBlock && BackCase.BB != NextBlock) {
// The last case block won't fall through into 'NextBlock' if we emit the
// branches in this order. See if rearranging a case value would help.
// We start at the bottom as it's the case with the least weight.