Assembler:Commands:XCHG

command xchg destination, source

Exchange the contents of the source with the destination.

Exchanges the contents of the destination (first) and source (second) operands. The operands can be two general-purpose registers or a register and a memory location. If a memory operand is referenced, the processor's locking protocol is automatically implemented for the duration of the exchange operation, regardless of the presence or absence of the LOCK prefix or of the value of the IOPL. The XCHG instruction can also be used instead of the BSWAP instruction for 16-bit operands.

c9x.me/x86/html/file_module_x86_id_328.html

Command Parameters

Parameter	Description
destination	r8-m8 / r16-m16 / r32-m32
source	r8-m8 / r16-m16 / r32-m32

Examples

xchg dl,ah

xchg al,[edx+110] // byte value

xchg ax,dx

xchg [eax+10],dx // word value

xchg edx,eax

xchg [esi],edi // dword value

See also

• Assembler
• Auto Assembler
• Assembler Commands

External links

• c9x.me/x86/
• ref.x86asm.net
• wikipedia.org/wiki/X86_instruction_listings