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Another situation where ROTR is cheaper than ROTL. 

llvm-svn: 55577
This commit is contained in:
Bill Wendling 2008-08-31 01:13:31 +00:00
parent 4822a7ac8a
commit 11284ea499
1 changed files with 3 additions and 3 deletions
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6
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -2044,10 +2044,10 @@ SDNode *DAGCombiner::MatchRotate(SDValue LHS, SDValue RHS) {
if (ConstantSDNode *SUBC =
dyn_cast<ConstantSDNode>(LHSShiftAmt.getOperand(0))) {
if (SUBC->getAPIntValue() == OpSizeInBits) {
if (HasROTL)
return DAG.getNode(ISD::ROTL, VT, LHSShiftArg, LHSShiftAmt).getNode();
else
if (HasROTR)
return DAG.getNode(ISD::ROTR, VT, LHSShiftArg, RHSShiftAmt).getNode();
else
return DAG.getNode(ISD::ROTL, VT, LHSShiftArg, LHSShiftAmt).getNode();
}
}
}