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[DAG][ARM] computeKnownBitsForTargetNode - add handling for ARMISD VORRIMM\VBICIMM nodes #149494

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[DAG][ARM] computeKnownBitsForTargetNode - add handling for ARMISD VORRIMM\VBICIMM nodes #149494

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[DAG][ARM] computeKnownBitsForTargetNode - add handling for ARMISD VO…
woruyu Jul 18, 2025
97757a8
fix: review
woruyu Jul 21, 2025
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25 changes: 25 additions & 0 deletions llvm/lib/Target/ARM/ARMISelLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -20106,6 +20106,31 @@ void ARMTargetLowering::computeKnownBitsForTargetNode(const SDValue Op,
Known = KnownOp0.intersectWith(KnownOp1);
break;
}
case ARMISD::VORRIMM: {
KnownBits KnownLHS = DAG.computeKnownBits(Op.getOperand(0), Depth + 1);

unsigned Encoded = Op.getConstantOperandVal(1);
unsigned ElemSize = Op.getScalarValueSizeInBits();
uint64_t DecodedVal = ARM_AM::decodeVMOVModImm(Encoded, ElemSize);
APInt Imm(ElemSize, DecodedVal);

Known.One = KnownLHS.One | Imm;
Known.Zero = KnownLHS.Zero & ~Imm;
return;
}
case ARMISD::VBICIMM: {
KnownBits KnownLHS = DAG.computeKnownBits(Op.getOperand(0), Depth + 1);

unsigned Encoded = Op.getConstantOperandVal(1);
unsigned ElemSize = Op.getScalarValueSizeInBits();
uint64_t DecodedVal = ARM_AM::decodeVMOVModImm(Encoded, ElemSize);
APInt Imm(ElemSize, DecodedVal);

APInt NotImm = ~Imm;
Known.One = KnownLHS.One & NotImm;
Known.Zero = KnownLHS.Zero | Imm;
return;
}
}
}

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