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| author | Craig Topper <craig.topper@gmail.com> | 2013-08-08 07:38:55 +0000 |
|---|---|---|
| committer | Craig Topper <craig.topper@gmail.com> | 2013-08-08 07:38:55 +0000 |
| commit | 309dfefb6f5801968b4bb000b0de01e4c5d6aab2 (patch) | |
| tree | a8e609e8f751ab6e281681e7be9f6e99ce0331c9 /llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | |
| parent | 2b7b2f373b7275330da97feaacaeb76342470072 (diff) | |
| download | bcm5719-llvm-309dfefb6f5801968b4bb000b0de01e4c5d6aab2.tar.gz bcm5719-llvm-309dfefb6f5801968b4bb000b0de01e4c5d6aab2.zip | |
Optimize mask generation for one of the DAG combiner shufflevector cases.
llvm-svn: 187961
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index cb8894105b1..0d71761fd0f 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -9358,10 +9358,10 @@ SDValue DAGCombiner::visitVECTOR_SHUFFLE(SDNode *N) { for (unsigned i = 0; i != NumElts; ++i) { int Idx = SVN->getMaskElt(i); if (Idx >= 0) { - if (Idx < (int)NumElts) - Idx += NumElts; - else + if (Idx >= (int)NumElts) Idx -= NumElts; + else + Idx = -1; // remove reference to lhs } NewMask.push_back(Idx); } |
