From: Zang Roy-r61911 <tie-fei.zang@freescale.com>
To: Kumar Gala <galak@kernel.crashing.org>
Cc: linuxppc-dev list <linuxppc-dev@ozlabs.org>,
Liu Yu <B13201@freescale.com>,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [PATCH] Fix rounding bug in emulation for double floatoperating
Date: 14 Dec 2007 14:06:14 +0800 [thread overview]
Message-ID: <1197612373.10259.9.camel@localhost.localdomain> (raw)
In-Reply-To: <BB2AC24A-6336-4270-9124-734BCC09F7DA@kernel.crashing.org>
On Fri, 2007-12-14 at 13:46, Kumar Gala wrote:
> >> When I run this on a G5 (w/HW FP) I get:
> >>
> >> dmul 3fe0000000000000 * 1 = 0 expected 0 (PASS)
> >> dmul bfe0000000000000 * 1 = 8000000000000000 expected 0 (PASS)
> >> dmul 8000000000000001 * bfe0000000000000 = 0 expected 0 (PASS)
> >>
> >> ddiv 1 / 4000000000000000 = 0 expected 0 (PASS)
> >>
> >> and on the 85xx w/FP emu:
> >>
> >> dmul 3fe0000000000000 * 1 = 0 expected 0 (PASS)
> >> dmul bfe0000000000000 * 1 = 8000000000000000 expected 0 (PASS)
> >> dmul 8000000000000001 * bfe0000000000000 = 0 expected 0 (PASS)
> >>
> >> ddiv 1 / 4000000000000000 = 0 expected 0 (PASS)
> >>
> >> Maybe I'm missing where the error is.
> > I am missing ...
> > It is supposed to run based on previous IEEE 754 patch.
> > http://ozlabs.org/pipermail/linuxppc-dev/2007-February/031351.html
>
> I'd really like to see to see a testcase show the issue with "classic
> FP emu" on a 85xx system.
I can understand.
You know, For a 85xx system without the previous patch or other
'classic' powerpc, it is hard to trigger this issue. Although I believe
it is a problem fixed up.
Do you have any idea?
Roy
next prev parent reply other threads:[~2007-12-14 6:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-10 5:00 [PATCH] Fix rounding bug in emulation for double float operating Liu Yu
2007-12-10 4:56 ` David Gibson
2007-12-10 5:25 ` [PATCH] Fix rounding bug in emulation for double floatoperating Liu Yu
2007-12-10 15:00 ` Kumar Gala
2007-12-11 1:38 ` Liu Yu
2007-12-11 3:19 ` Zang Roy-r61911
2007-12-11 15:26 ` Kumar Gala
2007-12-12 8:30 ` Zang Roy-r61911
2007-12-12 13:36 ` Kumar Gala
2007-12-14 5:46 ` Kumar Gala
2007-12-14 6:06 ` Zang Roy-r61911 [this message]
2007-12-14 6:14 ` Kumar Gala
2007-12-14 5:01 ` [PATCH] Fix rounding bug in emulation for double float operating Kumar Gala
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