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https://github.com/c64scene-ar/llvm-6502.git
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improved zap discovery
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26148 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -363,6 +363,39 @@ void AlphaDAGToDAGISel::Select(SDOperand &Result, SDOperand Op) {
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}
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break;
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case ISD::AND: {
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ConstantSDNode* SC;
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ConstantSDNode* MC;
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if (N->getOperand(0).getOpcode() == ISD::SRL &&
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(MC = dyn_cast<ConstantSDNode>(N->getOperand(1))) &&
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(SC = dyn_cast<ConstantSDNode>(N->getOperand(0).getOperand(1))))
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{
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uint64_t sval = SC->getValue();
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uint64_t mval = MC->getValue();
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if (get_zapImm(mval)) //the result is a zap, let the autogened stuff deal
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break;
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// given mask X, and shift S, we want to see if there is any zap in the mask
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// if we play around with the botton S bits
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uint64_t dontcare = (~0ULL) >> (64 - sval);
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uint64_t mask = mval << sval;
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if (get_zapImm(mask | dontcare))
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mask = mask | dontcare;
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if (get_zapImm(mask)) {
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SDOperand Src;
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Select(Src, N->getOperand(0).getOperand(0));
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SDOperand Z =
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SDOperand(CurDAG->getTargetNode(Alpha::ZAPNOTi, MVT::i64, Src,
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getI64Imm(get_zapImm(mask))), 0);
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Result = SDOperand(CurDAG->getTargetNode(Alpha::SRL, MVT::i64, Z,
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getI64Imm(sval)), 0);
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return;
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}
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}
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break;
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}
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}
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SelectCode(Result, Op);
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