Unsigned move vector element to general-purpose register
This instruction reads the unsigned integer from the source SIMD&FP register, zero-extends it to form a 32-bit or 64-bit value, and writes the result to the destination general-purpose register.
Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped.
This instruction is used by the alias MOV (to general).
| 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 | Q | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | imm5 | 0 | 0 | 1 | 1 | 1 | 1 | Rn | Rd | ||||||||||||
| op | imm4 | ||||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_AdvSIMD) then EndOfDecode(Decode_UNDEF); end; if imm5 == 'x0000' then EndOfDecode(Decode_UNDEF); end; let size : integer{} = LowestSetBitNZ(imm5[3:0]); let d : integer{} = UInt(Rd); let n : integer{} = UInt(Rn); let esize : integer{} = 8 << size; let datasize : integer{} = 32 << UInt(Q); if datasize == 64 && esize < 64 then EndOfDecode(Decode_UNDEF); end; if datasize == 32 && esize >= 64 then EndOfDecode(Decode_UNDEF); end; let index : integer = UInt(imm5[4:size+1]); let idxdsize : integer{} = 64 << UInt(imm5[4]);
| <Wd> |
Is the 32-bit name of the general-purpose destination register, encoded in the "Rd" field. |
| <Vn> |
Is the name of the SIMD&FP source register, encoded in the "Rn" field. |
| <Ts> |
Is an element size specifier,
encoded in
|
| <Xd> |
Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field. |
| Alias | Of variant | Is preferred when |
|---|---|---|
| MOV (to general) | 32-bit | imm5 IN {'xx100'} |
| MOV (to general) | 64-bit | imm5 IN {'x1000'} |
if index == 0 then AArch64_CheckFPEnabled(); else AArch64_CheckFPAdvSIMDEnabled(); end; let operand : bits(idxdsize) = V{}(n); X{datasize}(d) = ZeroExtend{datasize}(operand[index*:esize]);
This instruction is a data-independent-time instruction as described in About PSTATE.DIT.
2026-03_rel 2026-03-26 20:48:11
Copyright © 2010-2026 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.