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Date: Wed, 17 Feb 2016 11:25:45 +0200
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Subject: Re: ANNOUNCE: Update of DJGPP port of gcc-5.3.0
From: "Ozkan Sezer (sezeroz AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
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On 2/17/16, rugxulo AT gmail DOT com [via djgpp AT delorie DOT com] <djgpp AT delorie DOT com> wrote:
> Hi again,
>
> On Monday, February 15, 2016 at 8:11:49 PM UTC-6, Ozkan Sezer
> (sezeroz AT spam DOT no) [via djgpp AT spam DOT no] wrote:
>>
>> AFAICS, it is from quake's d_copy.s assembler source.
>
> The actual file should've been named d_copy.S (capital S) since it
> uses the preprocessor (to #include three *.h files and #define
> stuff). The file makefile.linux seems to use "-x assembler-with-cpp"
> to guarantee this.
>
> The actual line (137) is this:
>
> "	rep/movsl	(%esi),(%edi)"
>
> ... which is really this: "<tab>rep/movsl<tab>(%esi),(%edi)"
>
> But even more curious is that the file has copious line comments
> starting with "//". So if I had to guess, it's that GAS is (now)
> confusing the rest of the instruction as a comment.
>
> A quick diff (on objdump output) shows this:
>
> -   dd: f3 a5       rep movs DWORD PTR es:[edi],DWORD PTR ds:[esi]
> -   df: 01 c6       add    esi,eax
> -   e1: 01 d7       add    edi,edx
> -   e3: 4d          dec    ebp
> +   dd: f3 01 c6    repz add esi,eax
> +   e0: 01 d7       add    edi,edx
> +   e2: 4d          dec    ebp
>
> Notice that the "a5" is completely omitted, thus causing it to
> combine with the next instruction?
>
> Hmmm, no, "gcc -E -c" still shows "rep/movsl (%esi),(%edi)".
>
> Checking /dev/env/DJDIR/share/info/as.info ...
>
> 9.15 80386 Dependent Features
> 9.15.3.2 Special Characters
>
> "
>    If the `--divide' command line option has not been specified then
> the `/' character appearing anywhere on a line also introduces a line
> comment.
> "
>
> But 2.25.1's as.info says the same. So if this differs from 2.25.1,
> maybe they finally "fixed" it to do what the doc says.
>
> (A quick check of 2.19 info doc seems to imply similar, but it also
> almost seems to imply that '/' would only be a valid comment at the
> beginning of a line.)
>

The changelogs don't report such behavior change, do they?
This _should_ be reported to binutils bugzilla.

--
O.S.