Reverse bytes in 16-bit halfwords
This instruction reverses the byte order in each 16-bit halfword of a register.
| 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 | 0 | 1 | Rn | Rd | ||||||||
| S | opcode2 | opc | |||||||||||||||||||||||||||||
if opc == '11' && sf == '0' then EndOfDecode(Decode_UNDEF); end; let d : integer{} = UInt(Rd); let n : integer{} = UInt(Rn); let datasize : integer{} = 32 << UInt(sf); let container_size : integer{} = 8 << UInt(opc);
| <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. |
let operand : bits(datasize) = X{}(n); var result : bits(datasize); let containers : integer = datasize DIV container_size; for c = 0 to containers-1 do let container : bits(container_size) = operand[c*:container_size]; result[c*:container_size] = Reverse{container_size}(container, 8); end; X{datasize}(d) = result;
This instruction is a data-independent-time instruction as described in About PSTATE.DIT.
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