Bitwise select with first input inverted
This instruction selects bits from the inverted first source vector where the corresponding bit in the third source vector is '1', and from the second source vector where the corresponding bit in the third source vector is '0'. The result is destructively placed in the destination and first source vector. This instruction is unpredicated.
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | Zm | 0 | 0 | 1 | 1 | 1 | 1 | Zk | Zdn | ||||||||||||
| opc | o2 | ||||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_SVE2) && !IsFeatureImplemented(FEAT_SME) then EndOfDecode(Decode_UNDEF); end; let m : integer = UInt(Zm); let k : integer = UInt(Zk); let dn : integer = UInt(Zdn);
| <Zdn> |
Is the name of the first source and destination scalable vector register, encoded in the "Zdn" field. |
| <Zm> |
Is the name of the second source scalable vector register, encoded in the "Zm" field. |
| <Zk> |
Is the name of the third source scalable vector register, encoded in the "Zk" field. |
CheckSVEEnabled(); let VL : integer{} = CurrentVL(); let operand1 : bits(VL) = Z{}(dn); let operand2 : bits(VL) = Z{}(m); let operand3 : bits(VL) = Z{}(k); Z{VL}(dn) = (NOT(operand1) AND operand3) OR (operand2 AND NOT(operand3));
This instruction is a data-independent-time instruction as described in About PSTATE.DIT.
This instruction might be immediately preceded in program order by a MOVPRFX instruction. The MOVPRFX must conform to all of the following requirements, otherwise the behavior of the MOVPRFX and this instruction is CONSTRAINED UNPREDICTABLE:
2026-03_rel 2026-03-26 20:48:11
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