View source for Assembler:Commands:BSWAP

[[Category:Assembler]]
'''command''' bswap ''operand''

The bswap instruction reverse the byte order of the destination. Its used to convert values from Little-Endian to Big-Endian.



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Reverses the byte order of a 32-bit / 64-Bit (destination) register. 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.

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=== Command Parameters ===
{|width="85%" cellpadding="10%" cellpadding="5%" cellspacing="0" border="0"
!align="left"|Parameter
!style="width: 80%;background-color:white;" align="left"|Description
|-
|operand
|The operand to reverse byte order on
|}


== Examples ==

 bswap eax

 bswap edx

 bswap rax

 bswap rdx


{{AssemblerCommandSeeAlso}}


== External links ==
* [https://c9x.me/x86/ c9x.me/x86/]
* [http://ref.x86asm.net/ ref.x86asm.net]
* [https://wikipedia.org/wiki/X86_instruction_listings wikipedia.org/wiki/X86_instruction_listings]