Reverse Bytes reverses the byte order in a register.
This instruction is used by the pseudo-instruction REV64.
| 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 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | x | Rn | Rd | ||||||||
| opc | |||||||||||||||||||||||||||||||
integer d = UInt(Rd); integer n = UInt(Rn); integer datasize = if sf == '1' then 64 else 32; integer container_size; case opc of when '00' Unreachable(); when '01' container_size = 16; when '10' container_size = 32; when '11' if sf == '0' then UnallocatedEncoding(); container_size = 64;
| <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 general-purpose source register, encoded in the "Rn" 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 general-purpose source register, encoded in the "Rn" field. |
bits(datasize) operand = X[n]; bits(datasize) result; integer containers = datasize DIV container_size; integer elements_per_container = container_size DIV 8; integer index = 0; integer rev_index; for c = 0 to containers-1 rev_index = index + ((elements_per_container - 1) * 8); for e = 0 to elements_per_container-1 result<rev_index + 7:rev_index> = operand<index + 7:index>; index = index + 8; rev_index = rev_index - 8; X[d] = result;
Internal version only: isa v25.07, AdvSIMD v23.0, pseudocode v31.3
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