Date: Thu, 07 Aug 2003 16:37:52 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: deischen@freebsd.org Cc: Marcel Moolenaar <marcel@xcllnt.net> Subject: Re: Atomic swap Message-ID: <XFMail.20030807163752.jhb@FreeBSD.org> In-Reply-To: <Pine.GSO.4.10.10308071617070.14420-100000@pcnet5.pcnet.com>
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On 07-Aug-2003 Daniel Eischen wrote: > 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. Yes, t0 and t1 are #define's, so they don't work in inline asm. Also, you should clobber them if you use them directly, i.e. __asm(" ldq $1, %1\n" (suggested by Peter I think) "1: ldq_l $1, %1\n" " mov %2, $2\n" " stq_c $2, %1\n" " beq $2, 1b\n" " stq $1, %0\n" : "+m" (*res) : "m" (*dst), "r" (val) : "memory", "$1", "$2"); -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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