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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2019-02-08 17:19:01 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2019-02-08 17:19:01 +0000 |
| commit | 478bb90779863e4faadc37eacd2c101b5cdf3b78 (patch) | |
| tree | 5fd31d02ce7c3c93df165e151b5c754e23d46d3f /llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | |
| parent | 91c32fd8c8fa395971a028f7091273fa2c8f44e6 (diff) | |
| download | bcm5719-llvm-478bb90779863e4faadc37eacd2c101b5cdf3b78.tar.gz bcm5719-llvm-478bb90779863e4faadc37eacd2c101b5cdf3b78.zip | |
[TargetLowering] Add SimplifyDemandedBits funnel shift support
llvm-svn: 353539
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 5a933dd8be2..b462aabad2f 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -7144,6 +7144,10 @@ SDValue DAGCombiner::visitFunnelShift(SDNode *N) { if (N0 == N1 && hasOperation(RotOpc, VT)) return DAG.getNode(RotOpc, SDLoc(N), VT, N0, N2); + // Simplify, based on bits shifted out of N0/N1. + if (SimplifyDemandedBits(SDValue(N, 0))) + return SDValue(N, 0); + return SDValue(); } |
