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[LLVMdev] Cleanups in ROTL/ROTR DAG combiner code
2007 Mar 30
1
[LLVMdev] Cleanups in ROTL/ROTR DAG combiner code
...ND + || LHSShiftAmt.getOpcode() == ISD::ANY_EXTEND) && + (RHSShiftAmt.getOpcode() == ISD::SIGN_EXTEND + || RHSShiftAmt.getOpcode() == ISD::ZERO_EXTEND + || RHSShiftAmt.getOpcode() == ISD::ANY_EXTEND)) { + SDOperand LHSOp0 = LHSShiftAmt.getOperand(0); + SDOperand RHSOp0 = RHSShiftAmt.getOperand(0); + if (RHSOp0.getOpcode() == ISD::SUB && + RHSOp0.getOperand(1) == LHSOp0) { + // fold (or (shl x, (*ext y)), (srl x, (*ext (sub 32, y)))) -> + // (rotr x, y) + // fold (or (shl x, (*ext y)), (srl x, (*ext (sub 32, y)))) -> +...