Neccessity of push and pop operands on CPUs
Posted
by
Hawken
on Stack Overflow
See other posts from Stack Overflow
or by Hawken
Published on 2012-04-14T17:23:52Z
Indexed on
2012/04/14
17:29 UTC
Read the original article
Hit count: 225
Why do we have commands like push and pop?
From what I understand pop
and push
are basically the same as doing a (mov
then add
) and (sub
then mov
) on esp
respectively.
For example wouldn't:
pushl %eax
be equivalent to:
subl $4, %esp
movl %eax, (%esp-4)
please correct me if stack access is not (%esp-4)
, I'm still learning assembly
The only true benefit I can see is if doing both operation simultaneously offers some advantage; however I don't see how it could.
© Stack Overflow or respective owner