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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: Thu, 18 Feb 2016 03:27:08 +0100
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> This is not the first time when change to binutils forces to change 
> existing
> assembler code. Most often error messages are being generated for old
> GNU assembler  code. One that I remember was operand length suffix
> handling (when they are required, when not accepted).

It may be possible that Quake was the only instance of this weird rep/movsl 
in the "wild".

But the thing is, Quake source should be regarded as "frozen": certainly 
there will be people trying to recompile official unmodified (and 
unchanging) source in the future.
Silent bad binary code on this particular instruction will be yet another 
obstacle on their way.


--
Wiktor S.