DESTDEST[7..0]
TEMP(31..24]DEST[15..8]
TEMP(23..16]DEST[23..16]
TEMP(15..8]DEST[31..24]
TEMP(7..0]
Opcode |
Instruction |
Description |
|---|---|---|
|
0F C8+rd |
BSWAP r32 |
Reverses the byte order of a 32-bit register. |
Reverses the byte order of a 32-bit (destination) register: bits 0 through 7 are swapped with bits 24 through 31, and bits 8 through 15 are swapped with bits 16 through 23. This instruction is provided for converting little-endian values to big-endian format and vice versa.
To swap bytes in a word value (16-bit register), use the XCHG instruction. When the BSWAP instruction references a 16-bit register, the result is undefined.
The BSWAP instruction is not supported on Intel(R) Architecture processors
earlier than the Intel486
TEMP DEST
DEST[7..0] TEMP(31..24]
DEST[15..8] TEMP(23..16]
DEST[23..16] TEMP(15..8]
DEST[31..24] TEMP(7..0]
None.
None.
For details, see Volume 2A and Volume 2B of the Intel(R) 64 and IA-32 Intel Architecture Software Developer's Manual. For the latest updates on the instruction set information, go to the web site.