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REV64
Reverse Bytes reverses the byte order in a 64-bit general-purpose register.
When assembling for Armv8.2, an assembler must support this pseudo-instruction. It is optional whether an assembler supports this pseudo-instruction when assembling for an architecture earlier than Armv8.2.
This is a pseudo-instruction of REV. This means:
- The encodings in this description are named to match the encodings of REV.
- The assembler syntax is used only for assembly, and is not used on disassembly.
- The description of REV gives the operational pseudocode for this instruction.
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 |
1 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | Rn | Rd | ||||||||
sf | opc |
Assembler Symbols
<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 general-purpose source register, encoded in the "Rn" field. |
Operation
The description of REV gives the operational pseudocode for this instruction.
Operational information
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.