From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Kumar Gala <galak@kernel.crashing.org>
Cc: Xie Shaohui-B21989 <B21989@freescale.com>,
Liu Qiang-B32616 <B32616@freescale.com>,
Zang Roy-R61911 <r61911@freescale.com>,
Timur Tabi <timur@tabi.org>,
"tiejun.chen" <tiejun.chen@windriver.com>,
David Laight <David.Laight@ACULAB.COM>,
Fleming Andy-AFLEMING <afleming@freescale.com>,
Bhushan Bharat-R65777 <R65777@freescale.com>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: fsqrt
Date: Sat, 08 Jun 2013 09:23:51 +1000 [thread overview]
Message-ID: <1370647431.3766.432.camel@pasglop> (raw)
In-Reply-To: <B90B185D-AC79-4A39-91F1-57F371D9D732@kernel.crashing.org>
On Fri, 2013-06-07 at 14:19 -0500, Kumar Gala wrote:
> > I don't personally have the bandwidth to do a clean implementation (that
> > handles FP exceptions, NaNs, FPSCR, etc...) but I believe it would be
> > valuable if somebody else did (hint hint hint :-) since without this,
> > Fedora ppc64 is basically going to be a non-started on those chips.
> >
> > BTW. Did you guys (ie. FSL) finally add fsqrt to e6500 or it's still
> > out ?
> >
> > Cheers,
> > Ben.
>
> Pretty sure fsqrt is still out of e6500.
Ok, thinking out loud... looks like we might be able to just use existing
math-emu for that. From what I can tell, all it needs (other than enabling
the config option), is a call to flush_fp_to_thread(current);
While talking math-emu... we seem to have some duplication between the
code on do_mathemu which can be compiled without CONFIG_MATH_EMULATION and
in this case only just emulates loads/stores/fmr and the code in
arch/powerpc/kernel/softemu8xx.c.
Is there any reason we can't just get rid of the latter ?
Cheers,
Ben.
next prev parent reply other threads:[~2013-06-07 23:24 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-16 4:47 SATA FSL and upstreaming Benjamin Herrenschmidt
2013-05-16 5:45 ` Benjamin Herrenschmidt
2013-05-16 5:55 ` tiejun.chen
2013-05-16 6:06 ` Benjamin Herrenschmidt
2013-05-16 5:59 ` Zang Roy-R61911
2013-05-16 6:01 ` Bhushan Bharat-R65777
2013-05-16 6:05 ` Zang Roy-R61911
2013-05-16 6:09 ` Benjamin Herrenschmidt
2013-05-16 6:17 ` tiejun.chen
2013-05-16 6:20 ` Zang Roy-R61911
2013-05-16 6:25 ` tiejun.chen
2013-05-16 7:20 ` Zang Roy-R61911
2013-05-16 6:26 ` Benjamin Herrenschmidt
2013-05-16 6:21 ` Benjamin Herrenschmidt
2013-05-16 6:35 ` tiejun.chen
2013-05-16 6:37 ` Zang Roy-R61911
2013-05-16 6:40 ` Benjamin Herrenschmidt
2013-05-16 6:43 ` tiejun.chen
2013-05-16 6:48 ` Bhushan Bharat-R65777
2013-05-16 6:49 ` Zang Roy-R61911
2013-05-16 6:53 ` Benjamin Herrenschmidt
2013-05-16 6:56 ` tiejun.chen
2013-05-16 7:01 ` Zang Roy-R61911
2013-05-16 7:05 ` Benjamin Herrenschmidt
2013-05-16 7:13 ` Bhushan Bharat-R65777
2013-05-16 7:26 ` Benjamin Herrenschmidt
2013-05-16 7:20 ` Xie Shaohui-B21989
2013-05-16 7:25 ` Bhushan Bharat-R65777
2013-05-16 6:59 ` Benjamin Herrenschmidt
2013-05-16 7:17 ` Zang Roy-R61911
2013-05-16 6:52 ` Benjamin Herrenschmidt
2013-05-16 14:56 ` Timur Tabi
2013-06-07 3:52 ` Benjamin Herrenschmidt
2013-06-07 4:39 ` Benjamin Herrenschmidt
2013-06-07 4:45 ` Zang Roy-R61911
2013-06-07 4:47 ` Benjamin Herrenschmidt
2013-06-07 4:50 ` Zang Roy-R61911
2013-06-07 7:41 ` fsqrt Benjamin Herrenschmidt
2013-06-07 7:45 ` fsqrt Zang Roy-R61911
2013-06-07 8:53 ` fsqrt Benjamin Herrenschmidt
2013-06-07 8:59 ` fsqrt Benjamin Herrenschmidt
2013-06-07 10:48 ` fsqrt David Laight
2013-06-07 12:14 ` fsqrt Benjamin Herrenschmidt
2013-06-07 19:19 ` fsqrt Kumar Gala
2013-06-07 23:23 ` Benjamin Herrenschmidt [this message]
2013-06-07 23:25 ` fsqrt Benjamin Herrenschmidt
2013-06-07 23:30 ` fsqrt Benjamin Herrenschmidt
2013-06-08 0:20 ` fsqrt Dan Malek
2013-06-08 0:34 ` fsqrt Benjamin Herrenschmidt
2013-06-08 1:13 ` fsqrt Dan Malek
2013-06-08 4:31 ` fsqrt Benjamin Herrenschmidt
2013-06-09 6:32 ` fsqrt Benjamin Herrenschmidt
2013-06-07 7:46 ` fsqrt tiejun.chen
2013-06-07 8:53 ` fsqrt Benjamin Herrenschmidt
2013-06-07 9:02 ` fsqrt tiejun.chen
2013-06-07 12:07 ` fsqrt Benjamin Herrenschmidt
2013-06-07 7:05 ` FSL 64-bit DMA window question Benjamin Herrenschmidt
2013-06-07 7:58 ` Zang Roy-R61911
2013-06-07 8:55 ` Benjamin Herrenschmidt
2013-06-07 9:44 ` Zang Roy-R61911
2013-06-07 12:09 ` Benjamin Herrenschmidt
[not found] ` <1370642488.6813.15@snotra>
2013-06-07 22:02 ` Scott Wood
2013-06-07 22:09 ` Benjamin Herrenschmidt
2013-06-07 22:34 ` Scott Wood
2013-06-07 22:39 ` Benjamin Herrenschmidt
2013-06-07 23:29 ` Scott Wood
2013-06-07 23:33 ` Benjamin Herrenschmidt
2013-06-07 12:09 ` SATA FSL and upstreaming Timur Tabi
2013-05-16 6:17 ` Zang Roy-R61911
2013-05-16 6:23 ` Benjamin Herrenschmidt
2013-05-16 6:33 ` Bhushan Bharat-R65777
2013-05-16 6:34 ` Benjamin Herrenschmidt
2013-05-16 6:35 ` Zang Roy-R61911
2013-05-16 6:37 ` Benjamin Herrenschmidt
2013-05-16 6:41 ` tiejun.chen
2013-05-16 6:48 ` Zang Roy-R61911
2013-05-16 6:24 ` Xie Shaohui-B21989
2013-05-16 6:31 ` Benjamin Herrenschmidt
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