Assembly move instructions

Question

Hi I just started learning assembly in IA32. Can anyone tell me what these two move instructions do? They seem to be some compound instruction.

movl    (%esi,%edx), %ebx
movl    %ebx, (%edi,%edx)

Answer 1

movl    (%esi,%edx), %ebx

Here you have an array whose base is at %edx . You are accessing an element indexed by %esi , and moving it to a temporary register %ebx .

movl    %ebx, (%edi,%edx)

Here you are moving a value from your temporary register %ebx to an element in your %edx array indexed by %edi .