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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2015-06-13 16:25:12 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2015-06-13 16:25:12 +0000 |
| commit | d3f64274462e500724ae2df9d7b590094eff87b4 (patch) | |
| tree | de7dd92d7cd14a1a625f098ef574a8403842f3bf /llvm/lib/CodeGen | |
| parent | 57149984849a14f664b749a312f61fbdfe413691 (diff) | |
| download | bcm5719-llvm-d3f64274462e500724ae2df9d7b590094eff87b4.tar.gz bcm5719-llvm-d3f64274462e500724ae2df9d7b590094eff87b4.zip | |
[DAGCombiner] Added BSWAP(BSWAP(x)) -> x combine pattern.
llvm-svn: 239682
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 1e33f1ed10f..33f5f52332a 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -4773,6 +4773,9 @@ SDValue DAGCombiner::visitBSWAP(SDNode *N) { // fold (bswap c1) -> c2 if (isConstantIntBuildVectorOrConstantInt(N0)) return DAG.getNode(ISD::BSWAP, SDLoc(N), VT, N0); + // fold (bswap (bswap x)) -> x + if (N0.getOpcode() == ISD::BSWAP) + return N0->getOperand(0); return SDValue(); } |
