Date: Thu, 7 Aug 2003 16:21:20 -0400 (EDT) From: Daniel Eischen <eischen@vigrid.com> To: Marcel Moolenaar <marcel@xcllnt.net> Cc: alpha@freebsd.org Subject: Re: Atomic swap Message-ID: <Pine.GSO.4.10.10308071617070.14420-100000@pcnet5.pcnet.com> In-Reply-To: <20030807195504.GA837@athlon.pn.xcllnt.net>
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On Thu, 7 Aug 2003, Marcel Moolenaar wrote:
> On Thu, Aug 07, 2003 at 03:31:55PM -0400, Daniel Eischen wrote:
> > > > > " stq t0,%3\n"
> > > ^^^^^^^^^^^^^^^^^^^^
> > >
> > > Whoops, typo: %3 should be %2.
> >
> > Yup, I caught that but didn't want to complain when something
> > is handed to me on a silver platter ;-)
>
> As long as you saw it :-)
BTW, this is the only way I got it to compile. The compiler
(or assembler) didn't seem to like having t0 and t1 hardcoded.
Grr, I just remembered. t0, t1, etc are our names for
them. They should probably be $1 and $2.
static __inline void
atomic_swap_long(volatile long *dst, long val, long *res)
{
long temp1, temp2;
__asm ( "1: ldq_l %3, %1\n"
" mov %2, %4\n"
" stq_c %4, %1\n"
" beq %4, 1b\n"
" stq %3, %0\n"
: "=m"(*res) : "m"(*dst), "r"(val), "r"(temp1), "r"(temp2) : "memory");
}
--
Dan Eischen
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