Extract register extracts a register from a pair of registers.
This instruction is used by the alias ROR (immediate).
| 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 |
| sf | 0 | 0 | 1 | 0 | 0 | 1 | 1 | 1 | N | 0 | Rm | imms | Rn | Rd | |||||||||||||||||
| op21 | o0 | ||||||||||||||||||||||||||||||
if N != sf then UNDEFINED; if sf == '0' && imms<5> == '1' then UNDEFINED; integer d = UInt(Rd); integer n = UInt(Rn); integer m = UInt(Rm); constant integer datasize = 32 << UInt(sf); constant integer lsb = UInt(imms);
| <Wd> |
Is the 32-bit name of the general-purpose destination register, encoded in the "Rd" field. |
| <Wn> |
Is the 32-bit name of the first general-purpose source register, encoded in the "Rn" field. |
| <Wm> |
Is the 32-bit name of the second general-purpose source register, encoded in the "Rm" field. |
| <Xd> |
Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field. |
| <Xn> |
Is the 64-bit name of the first general-purpose source register, encoded in the "Rn" field. |
| <Xm> |
Is the 64-bit name of the second general-purpose source register, encoded in the "Rm" field. |
| Alias | Is preferred when |
|---|---|
| ROR (immediate) | Rn == Rm |
bits(datasize) result; bits(datasize) operand1 = X[n, datasize]; bits(datasize) operand2 = X[m, datasize]; bits(2*datasize) concat = operand1:operand2; result = concat<(lsb+datasize)-1:lsb>; X[d, datasize] = result;
If PSTATE.DIT is 1:
Internal version only: aarchmrs v2023-12_rel, pseudocode v2023-12_rel, sve v2023-12_rel ; Build timestamp: 2023-12-15T16:46
Copyright © 2010-2023 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.