From: Thiemo Seufer <ths@networkno.de>
To: "Maciej W. Rozycki" <macro@linux-mips.org>
Cc: Atsushi Nemoto <anemo@mba.ocn.ne.jp>,
u1@terran.org, linux-mips@linux-mips.org
Subject: Re: MIPS checksum bug
Date: Fri, 19 Sep 2008 18:35:38 +0200 [thread overview]
Message-ID: <20080919163538.GA22497@networkno.de> (raw)
In-Reply-To: <Pine.LNX.4.55.0809191656030.29711@cliff.in.clinika.pl>
Maciej W. Rozycki wrote:
> On Sat, 20 Sep 2008, Atsushi Nemoto wrote:
>
> > @@ -229,6 +239,9 @@ LEAF(csum_partial)
> >
> > /* Still a full word to go */
> > ulw t1, (src)
> > +#ifdef USE_DOUBLE
> > + add t1, zero /* clear upper 32bit */
> > +#endif
> > PTR_ADDIU src, 4
> > ADDC(sum, t1)
> >
>
> Unfortunately you can't zero-extend with a single instruction (you can
> use a single sll(v) to sign-extend), unless the R2 ISA provides some
> suitable oddity (which I haven't checked).
AFAIR dext can do this for MIPS64 R2.
Thiemo
next prev parent reply other threads:[~2008-09-19 16:35 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <072748C6-07A9-4167-A8A5-80D0F7D9C784@darkforest.org>
2008-09-17 5:15 ` MIPS checksum bug Bryan Phillippe
2008-09-17 10:40 ` Maciej W. Rozycki
2008-09-17 13:23 ` Atsushi Nemoto
2008-09-17 14:46 ` Maciej W. Rozycki
2008-09-17 15:27 ` Atsushi Nemoto
2008-09-17 18:21 ` Maciej W. Rozycki
2008-09-18 22:07 ` Ralf Baechle
2008-09-19 10:12 ` Maciej W. Rozycki
2008-09-19 11:23 ` Ralf Baechle
2008-09-19 11:47 ` [PATCH] MIPS checksum fix Ralf Baechle
2008-09-19 12:07 ` Ralf Baechle
2008-09-19 12:15 ` Maciej W. Rozycki
2008-09-19 14:09 ` Atsushi Nemoto
2008-09-19 15:02 ` Maciej W. Rozycki
2008-09-20 15:09 ` Ralf Baechle
2008-09-23 21:52 ` Bryan Phillippe
2008-09-23 22:06 ` Ralf Baechle
2008-09-29 15:28 ` Atsushi Nemoto
2008-09-19 12:26 ` MIPS checksum bug Maciej W. Rozycki
2008-09-19 16:04 ` Bryan Phillippe
2008-09-17 22:52 ` Bryan Phillippe
2008-09-18 16:17 ` Atsushi Nemoto
2008-09-19 1:14 ` Ralf Baechle
2008-09-19 15:43 ` Atsushi Nemoto
2008-09-19 16:09 ` Maciej W. Rozycki
2008-09-19 16:35 ` Thiemo Seufer [this message]
2008-09-19 23:18 ` Maciej W. Rozycki
2008-09-20 0:13 ` Ralf Baechle
2008-09-20 13:45 ` Atsushi Nemoto
2008-09-18 4:43 ` Bryan Phillippe
2008-09-18 10:06 ` Maciej W. Rozycki
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