Add multiple of predicate register size to scalar register
This instruction adds the current predicate register size in bytes multiplied by an immediate in the range -32 to 31 to the 64-bit source general-purpose register or current stack pointer and places the result in the 64-bit destination general-purpose register or current stack pointer.
| 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 | Rn | 0 | 1 | 0 | 1 | 0 | imm6 | Rd | |||||||||||||
| op | |||||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_SVE) && !IsFeatureImplemented(FEAT_SME) then EndOfDecode(Decode_UNDEF); end; let n : integer = UInt(Rn); let d : integer = UInt(Rd); let imm : integer = SInt(imm6);
| <Xd|SP> |
Is the 64-bit name of the destination general-purpose register or stack pointer, encoded in the "Rd" field. |
| <Xn|SP> |
Is the 64-bit name of the source general-purpose register or stack pointer, encoded in the "Rn" field. |
| <imm> |
Is the signed immediate operand, in the range -32 to 31, encoded in the "imm6" field. |
CheckSVEEnabled(); let VL : integer{} = CurrentVL(); let PL : integer{} = VL DIV 8; let operand1 : bits(64) = if n == 31 then SP{64}() else X{64}(n); let result : bits(64) = operand1 + (imm * (PL DIV 8)); if d == 31 then SP{64}() = result; else X{64}(d) = result; end;
This instruction is a data-independent-time instruction as described in About PSTATE.DIT.
2026-03_rel 2026-03-26 20:48:11
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