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From:	Martin Str|mberg <ams AT ludd DOT luth DOT se>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: different binary output with 32- and 64-bit hosted compilers
Date:	Wed, 2 Sep 2015 14:52:13 +0000 (UTC)
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"Ozkan Sezer (sezeroz AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com> wrote:
> I have a source that gives the following asm output difference

> --- g_weapon.s
> +++ ../../g_weapon.s
> @@ -4526,7 +4526,7 @@
>         .long   1065353216
>         .p2align 3
>  LC5:
> -       .long   -1717986918
> +       .long   2576980378
>         .long   1069128089
>         .p2align 2
>  LC13:

Yes, I understand that.

> .. and results in different *.o.  This is with gcc5 (which I really
> don't want to use).

The diff above can't give different bit patterns on 32-bit
two-complements machine. The bits will be
10011001100110011001100110011010 for both -1717986918 and 2576980378.
The differences in .o must be because of something else.

> The original mail shows that with gcc-3.4.6 there are not only differences
> like -858993459 and 3435973837 but also asm output differences.

I have, so far, only seen posts from you with this (IMO) same bits
non-difference.

If there are different opcodes used, it's (much) harder to definitely
say if they mean the same thing. Likely they don't.


-- 
MartinS

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