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From: Paul Rubin <no.email@nospam.invalid>
Newsgroups: comp.lang.ada
Subject: Re: AI12-0218:  What is the portable representation clause for
 processing IETF packets on little-endian machines?
Date: Fri, 11 May 2018 18:15:29 -0700
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"Randy Brukardt" <randy@rrsoftware.com> writes:
> I don't know of any way on the x86 processor of reading a byte-swapped 
> 32-bit integer into a register so it can be used.

Load it into a register, then BSWAP.  This could be made into a compiler
intrinsic if necessary.  GCC has __builtin_bswap16, __builtin_bswap32,
and __builtin_bswap64 for this purpose.