Base Instructions | SIMD&FP Instructions | SVE Instructions | SME Instructions | Index by Encoding | Shared Pseudocode | Proprietary Notice

## ASR (immediate, unpredicated)

Arithmetic shift right by immediate (unpredicated)

Shift right by immediate, preserving the sign bit, each element of the source vector, and place the results in the corresponding elements of the destination vector. The immediate shift amount is an unsigned value in the range 1 to number of bits per element. 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 | tszh | 1 | tszl | imm3 | 1 | 0 | 0 | 1 | 0 | 0 | Zn | Zd
|  |  |  |  |  |  | U |  |

####

ASR <Zd>.<T>, <Zn>.<T>, #<const>

if !HaveSVE() && !HaveSME() then UNDEFINED; constant bits(4) tsize = tszh:tszl; if tsize == '0000' then UNDEFINED; constant integer esize = 8 << HighestSetBit(tsize); integer n = UInt(Zn); integer d = UInt(Zd); integer shift = (2 * esize) - UInt(tsize:imm3);

### Assembler Symbols

<Zd> | Is the name of the destination scalable vector register, encoded in the "Zd" field.

<T> | Is the size specifier, encoded in tszh:tszl:
tszh | tszl | <T>
--- | --- | ---
00 | 00 | RESERVED
00 | 01 | B
00 | 1x | H
01 | xx | S
1x | xx | D

<Zn> | Is the name of the source scalable vector register, encoded in the "Zn" field.

<const> | Is the immediate shift amount, in the range 1 to number of bits per element, encoded in "tszh:tszl:imm3".

### Operation

CheckSVEEnabled(); constant integer VL = CurrentVL; constant integer elements = VL DIV esize; bits(VL) operand1 = Z[n, VL]; bits(VL) result; for e = 0 to elements-1 bits(esize) element1 = Elem[operand1, e, esize]; Elem[result, e, esize] = ASR(element1, shift); Z[d, VL] = result;

### Operational information

If FEAT_SVE2 is implemented or FEAT_SME is implemented, then if PSTATE.DIT is 1:

- The execution time of this instruction is independent of:
  - The values of the data supplied in any of its registers.
  - The values of the NZCV flags.
- The response of this instruction to asynchronous exceptions does not vary based on:
  - The values of the data supplied in any of its registers.
  - The values of the NZCV flags.

Base Instructions | SIMD&FP Instructions | SVE Instructions | SME Instructions | Index by Encoding | Shared Pseudocode | Proprietary Notice

Internal version only: isa v33.64, AdvSIMD v29.12, pseudocode v2023-06_rel, sve v2023-06_rel ; Build timestamp: 2023-07-04T19:42

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