Neccessity of push and pop operands on CPUs
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Hawken
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Published on 2012-04-14T17:23:52Z
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2012/04/14
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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.
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