question about allocating local variable
Prawit Chaivong
arsenal_pui@yahoo.com
Tue Jun 29 03:14:00 GMT 2004
--- Eljay Love-Jensen <eljay@adobe.com> wrote:
> Hi Prawit,
>
> >Does anybody has any explaination [why the
> compiler allocates more than
> specified]?
>
> Alignment.
If we need char a[9] and the compiler allocated 12
bytes for me. That makes sense. But I'm wondering why
I need 9 bytes but compiler allocated 24 bytes.
I might misunderstand about alignment. And I will be
appreciate if you could tell me why it gonna be that
way.
>
> You didn't specify what platform, GCC version
> (3.3.4? 3.4.0?), and compile
> options you are using. If you are not generated
> optimized code, the code
> may not be optimized.
>
gcc 2.96 on x86 And asm code are the same no matter
what you gonna optimized or not.
> It is also possible that one of the GCC Gnurus made
> a boo-boo. Rare, but
> can happen. Especially between optimizations that
> are in contention, which
> may have unintended side-effects on different
> platforms. (I discovered 3
> such issues, on GCC 2.95 on Solaris. They're all
> fixed now.)
>
> HTH,
> --Eljay
>
>
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