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:

313029282726252423222120191817161514131211109876543210
1101101011000000000011RnRd
sfSopcode2opc

64-bit

REV64 <Xd>, <Xn>

is equivalent to

REV <Xd>, <Xn>

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:


Internal version only: aarchmrs v2024-03_relA, pseudocode v2024-03_rel, sve v2024-03_rel ; Build timestamp: 2024-03-26T09:45

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