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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: AI12-0218:  What is the portable representation clause for
 processing IETF packets on little-endian machines?
Date: Tue, 15 May 2018 16:39:24 -0500
Organization: JSA Research & Innovation
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"Paul Rubin" <no.email@nospam.invalid> wrote in message 
news:87lgcld9yu.fsf@nightsong.com...
>> What's "BSWAP"? It's not an instruction I'm familar with on x86.
>
> http://www.felixcloutier.com/x86/BSWAP.html
>
>> (Admittedly, I don't usually use newer instructions because of the
>> need to have some sort of alternative to run on older processors.)
>
> It was introduced with the 486 so I think it runs on almost any x86 that
> anyone is currently using.

My bad; it definitely is in the printed Pentium manual on my shelf. Never 
had a reason to use it, I guess.

>> In any case, one has to build such support into the back-end.
>
> In GCC you can write intrinsics by using pragmas that include the
> desired assembly code.

You can write assembly code in Janus/Ada, but that would be terrible quality 
as that doesn't tie into the register manager and thus has to use memory to 
get operands in and out.

                 Randy.