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Subject: Re: [PATCH] Fix rounding bug in emulation for double floatoperating
From: Zang Roy-r61911 <tie-fei.zang@freescale.com>
To: Kumar Gala <galak@kernel.crashing.org>
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Date: 14 Dec 2007 14:06:14 +0800
Cc: linuxppc-dev list <linuxppc-dev@ozlabs.org>, Liu Yu <B13201@freescale.com>,
	David Gibson <david@gibson.dropbear.id.au>
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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