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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2012-05-26 21:19:12 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2012-05-26 21:19:12 +0000 |
| commit | 5aad872f8c4d85112172057fb5bf9a7f64013c6c (patch) | |
| tree | 1d422debfe3da179889f004e2be295b5e516c137 /llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp | |
| parent | f2beccf6b4e9eb59b5080ae866e8d59a38679f15 (diff) | |
| download | bcm5719-llvm-5aad872f8c4d85112172057fb5bf9a7f64013c6c.tar.gz bcm5719-llvm-5aad872f8c4d85112172057fb5bf9a7f64013c6c.zip | |
SDAGBuilder: Don't create an invalid iterator when there is only one switch case.
Found by libstdc++'s debug mode.
llvm-svn: 157522
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp index 0d37c62660d..f8cbcaa0d65 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp @@ -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. |
