From mboxrd@z Thu Jan  1 00:00:00 1970
From: Franz Sirl <Franz.Sirl-kernel@lauterbach.com>
To: Geoff Keating <geoffk@cygnus.com>
Cc: "David J Schinsing" <dxs@pt.com>, gcc@gcc.gnu.org
Subject: Re: PowerPC code generation
Date: Wed, 05 Jul 2000 13:53:00 -0000
Message-id: <4.3.2.7.2.20000705224335.00d84780@mail.lauterbach.com>
References: <David> <J> <Schinsing"'s> <message> <of> <"Wed,> <5> <Jul> <2000> <14:47:53> <-0400> <OFA60BB7AF.840E75F8-ON85256913.0066FEA7@pt.com> <jm1z189vdd.fsf@envy.cygnus.com>
X-SW-Source: 2000-07/msg00078.html

At 22:26 05.07.00, Geoff Keating wrote:
>"David J Schinsing" <dxs@pt.com> writes:
>
> >    What can I do to get gcc to generate byte-reversed loads and stores
> > (like the lwbrx instruction, for example).  Perhaps there's a way to define
> > a structure so as to generate them?
>
>You can use asm statements, like
>
>asm ("lwbrx %0, 0, %1" : "=r"(result) : "r"(&input), "X"(input));
>
>at present, there is no way to have gcc generate such code without
>using asm statements.

Just out of interest, if I would implement __attribute__((little_endian)) 
and __attribute__((big_endian)) for MEM's, basically the major work would 
be to create something like a "revmovsi" pattern in the .md and tell 
compiler how to use it, or? Which pass of the compiler would be responsible 
for that? reload?

Franz.