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Re: Stack frame question on x86 code generation
- From: Gang-Ryung Uh <uh18104 at yahoo dot com>
- To: Arturas Moskvinas <arturas dot moskvinas at gmail dot com>, Niko Matsakis <niko at alum dot mit dot edu>, gcc-help <gcc-help at gcc dot gnu dot org>
- Date: Sun, 24 Apr 2005 08:06:27 -0700 (PDT)
- Subject: Re: Stack frame question on x86 code generation
Thank you!
Your explanation helps a lot.
Best regards,
--- Arturas Moskvinas <arturas.moskvinas@gmail.com>
wrote:
> > This is to make room for the parameters to
> printf(); there are two, and
> > each is a pointer, and hence four bytes, so the
> total space required is
> > eight bytes.
>
> I think you are not very correct in this part, if
> you write simple
> function which calls function without parameter,
> you'll see that gcc
> is also substract by 8 (12 if you use
> -fomit-frame-pointer). Command
> pushl substracts ESP pointer by 4 itself. So i think
> gcc is trying to
> align variable (and return address) in stack.
>
>
> Arturas Moskvinas
>
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