gnu/155309: [PATCH] gcc: backport bswap32() and bswap64()

[Bruce Evans]

The following reply was made to PR gnu/155309; it has been noted by GNATS.

From: Bruce Evans <brde at optusnet.com.au>
To: Martin Matuska <mm at FreeBSD.org>
Cc: FreeBSD-gnats-submit at FreeBSD.org, freebsd-bugs at FreeBSD.org
Subject: Re: gnu/155309: [PATCH] gcc: backport bswap32() and bswap64()
Date: Sun, 6 Mar 2011 22:28:19 +1100 (EST)

 On Sun, 6 Mar 2011, Martin Matuska wrote:
 
 >> Description:
 > In many ports, we have to deal with patching the missing bswap32()
 > and bswap64() functions.
 
 Er, we have these in endian.h.
 
 > The gcc-4.3 branch SVN revision is 118361, is GPLv2-licensed,
 > applies cleanly and is fully compatible with our code.
 
 However, gcc doesn't know how to turn a C expression for bswap*() into
 the bswap instruction.  clang does.  Does this patch fix that?  Using
 the C expression in all cases allows cleaning endian.h files, except
 possibly on other arches that still need asm.
 
 Bruce