diff options
| author | Bill Wendling <isanbard@gmail.com> | 2008-08-31 01:04:56 +0000 |
|---|---|---|
| committer | Bill Wendling <isanbard@gmail.com> | 2008-08-31 01:04:56 +0000 |
| commit | 353dea2f0aca7ddbdad242b9dabb065337744d98 (patch) | |
| tree | 790ab2af1baf06409b4da6d27cca0663ef861459 /lib/CodeGen/SelectionDAG/DAGCombiner.cpp | |
| parent | c5cbda12e933591ce76135aa776c44193255b2e9 (diff) | |
For this pattern, ROTR is the cheaper option.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55576 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index c0d5d08df1..2521609f5b 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -2075,14 +2075,14 @@ SDNode *DAGCombiner::MatchRotate(SDValue LHS, SDValue RHS) { } } else if (LExtOp0.getOpcode() == ISD::SUB && RExtOp0 == LExtOp0.getOperand(1)) { - // fold (or (shl x, (*ext (sub 32, y))), (srl x, (*ext r))) -> + // fold (or (shl x, (*ext (sub 32, y))), (srl x, (*ext y))) -> // (rotr x, y) - // fold (or (shl x, (*ext (sub 32, y))), (srl x, (*ext r))) -> + // fold (or (shl x, (*ext (sub 32, y))), (srl x, (*ext y))) -> // (rotl x, (sub 32, y)) if (ConstantSDNode *SUBC = cast<ConstantSDNode>(LExtOp0.getOperand(0))) { if (SUBC->getAPIntValue() == OpSizeInBits) { - return DAG.getNode(HasROTL ? ISD::ROTL : ISD::ROTR, VT, LHSShiftArg, - HasROTL ? LHSShiftAmt : RHSShiftAmt).getNode(); + return DAG.getNode(HasROTR ? ISD::ROTR : ISD::ROTL, VT, LHSShiftArg, + HasROTR ? RHSShiftAmt : LHSShiftAmt).getNode(); } } } |