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
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assembly

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stack

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cpu

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cpu-architecture

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att

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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