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Date: Wed, 17 Feb 2016 12:58:10 +0200
Message-ID: <CAA2C=vCK7HN5hqT10_LBCdET9R_=dMbH1uYPELU4CJs80==CLw@mail.gmail.com>
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>
To: djgpp AT delorie DOT com
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On 2/17/16, Ozkan Sezer <sezeroz AT gmail DOT com> wrote:
> 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.
>

Interesting thing is, I can not reproduce the issue on linux:
I compiled the pristine binutils-2.26 source on my x86_64-linux
(fedora 20), installed to ~/b226.

I then ran first normally:
$ gcc -m32 -x assembler-with-cpp -v -c d_copy.s
... which reports:
COLLECT_GCC_OPTIONS='-m32' '-v' '-c' '-mtune=generic' '-march=i686'
 as -v --32 -o d_copy.o /tmp/ccEPaWUM.s
GNU assembler version 2.23.2 (x86_64-redhat-linux) using BFD version
version 2.23.2

And a second time with the PATH pointing to new binutils, like:
$ PATH=~/b226/bin:$PATH gcc -m32 -x assembler-with-cpp -v -c d_copy.s
... which reports:
COLLECT_GCC_OPTIONS='-m32' '-v' '-c' '-mtune=generic' '-march=i686'
 as -v --32 -o d_copy.o /tmp/ccPMZpRd.s
GNU assembler version 2.26 (x86_64-pc-linux-gnu) using BFD version
(GNU Binutils) 2.26.20160125

Then I ran objdump -d on the two generated *.o files and they are identical:
  dd:	f3 a5                	rep movsl %ds:(%esi),%es:(%edi)

Is this specific to djgpp (or to djgpp port of binutils) ?

--
O.S.