Message-Id:	<199704151205.MAA07354@bryggen.bgnett.no>
From:	"Gisle Vanem" <giva AT bgnett DOT no>
To:	<grendel AT hoth DOT amu DOT edu DOT pl>
Cc:	<djgpp AT delorie DOT com>
Subject:	Re: Using -m486
Date:	Tue, 15 Apr 1997 14:05:15 +0200
MIME-Version:	1.0

> Hmm... The -m486 won't do what you want. It merely instructs the
optimizer to 
> optimize code for i486 ordering of instructions and their timings. It
doesn't 
> mean it will use BSWAP to swap bytes. *It will not* do that. 

I know. I should maybe clearer in my original post. My intention was to
check (at runtime) if CPU was 486+ before running the code compiled with
BSWAP. The BSWAP should be an inline asm function (coded using .byte xx
since
gas knows nothing about 486+ instructions).

> You can hand-code these instructions where you need'em. The -m386 -m486
*do not* 
> choose the instruction set specific for the CPU they *seem* to select.
-m486 
> will still use only i386 instructions - how otherwise would programs
compiled 
> with -m486 run on i386? 

Gisle Vanem        ---- Nera Telecomm ASA      tel. +47-55-225633
SW Eng.                 P.O.Box 10             fax. +47-55-225651
                        5061 Kokstad, NORWAY   email: giva AT bgnett DOT no
                                                      gv AT nera DOT no

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