Unsigned saturating increment vector by multiple of 64-bit predicate constraint element count
This instruction determines the number of active 64-bit elements implied by the named predicate constraint, multiplies that by an immediate in the range 1 to 16 inclusive, and then uses the result to increment all destination vector elements. The results are saturated to the 64-bit unsigned integer range.
The named predicate constraint limits the number of active elements in a single predicate to:
Unspecified or out of range constraint encodings generate an empty predicate or zero element count rather than Undefined Instruction exception.
| 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 | 1 | 1 | 1 | 0 | imm4 | 1 | 1 | 0 | 0 | 0 | 1 | pattern | Zdn | |||||||||||
| size | D | U | |||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_SVE) && !IsFeatureImplemented(FEAT_SME) then EndOfDecode(Decode_UNDEF); end; let esize : integer{} = 64; let dn : integer = UInt(Zdn); let pat : bits(5) = pattern; let imm : integer = UInt(imm4) + 1; let unsigned : boolean = TRUE;
| <Zdn> |
Is the name of the source and destination scalable vector register, encoded in the "Zdn" field. |
| <imm> |
Is the immediate multiplier, in the range 1 to 16, defaulting to 1, encoded in the "imm4" field. |
CheckSVEEnabled(); let VL : integer{} = CurrentVL(); let elements : integer = VL DIV esize; let count : integer = DecodePredCount(pat, esize); let operand1 : bits(VL) = Z{}(dn); var result : bits(VL); for e = 0 to elements-1 do let op1elt : bits(esize) = operand1[e*:esize]; if unsigned then (result[e*:esize], -) = UnsignedSatQ{esize}(UInt(op1elt) + (count * imm)); else (result[e*:esize], -) = SignedSatQ{esize}(SInt(op1elt) + (count * imm)); end; end; Z{VL}(dn) = result;
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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