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From: "Wiktor S. (wswiktorSP AT Mpoczta DOT fm) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: ANNOUNCE: Update of DJGPP port of gcc-5.3.0
Date: Tue, 16 Feb 2016 10:19:21 +0100
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

>> This was a one-line problem in assembly code:
>> 
>>     rep/movsl (%esi),(%edi)
>> 
>> Newest as.exe generates wrong binary code on the above line. After
>> changing to "rep movsl" with space it worked.
>> 
>> I don't know if rep/movsl syntax is correct or not, but if it is
>> not, AS should fail instead of silently generating bad code.
> 
> Do you mean that GCC itself is generating [sic] "rep/movsl" or is it
> some inline or handwritten (external) assembly file?


It is in handwritten assembly.

The dissasembled (wrong) instruction is

    rep add %eax,%esi



-- 
Wiktor S.