From: Segher Boessenkool <segher@kernel.crashing.org>
To: "Zhu Ebony-r57400" <ebony.zhu@freescale.com>
Cc: linuxppc-dev@ozlabs.org, Paul Mackerras <paulus@samba.org>
Subject: Re: [patch][0/5] powerpc: Add support to fully comply with IEEE-754standard
Date: Fri, 12 Jan 2007 13:03:53 +0100 [thread overview]
Message-ID: <009dcf6d65c2d14067471cb2df09fae2@kernel.crashing.org> (raw)
In-Reply-To: <32F3CC26D4DAC44E8ECD07155727A46E816A18@zch01exm20.fsl.freescale.net>
> When floating-point underflow exceptions are disabled
> (SPEFSCR[FUNFE] is cleared) and the result of a floating-point
> operation
> underflows, a signed zero result is produced.
You probably want to make at least this one tweakable
per-process; on some important algorithms (some FFTs
etc.) the results are perfectly acceptable with underflow-
to-zero and the performance difference is huge. AltiVec
can do this per-process too, for example -- it has a
user register for setting this, you need some other
interface though.
Segher
next prev parent reply other threads:[~2007-01-12 12:03 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-12 5:19 [patch][0/5] powerpc: Add support to fully comply with IEEE-754 standard Zhu Ebony-r57400
2007-01-12 5:29 ` Paul Mackerras
2007-01-12 5:46 ` Kumar Gala
2007-01-12 8:27 ` Zhu Ebony-r57400
2007-01-12 12:06 ` Segher Boessenkool
2007-01-15 8:41 ` Zhu Ebony-r57400
2007-01-12 6:38 ` [patch][0/5] powerpc: Add support to fully comply with IEEE-754standard Zhu Ebony-r57400
2007-01-12 6:49 ` Kumar Gala
2007-01-12 12:03 ` Segher Boessenkool [this message]
2007-01-15 8:16 ` Zhu Ebony-r57400
2007-01-15 16:08 ` Segher Boessenkool
2007-01-12 6:41 ` [patch][0/5] powerpc: Add support to fully comply with IEEE-754 standard Kumar Gala
2007-01-12 8:09 ` Zhu Ebony-r57400
2007-01-12 12:04 ` Segher Boessenkool
2007-01-15 6:45 ` Zhu Ebony-r57400
2007-01-15 15:54 ` Segher Boessenkool
2007-01-12 18:36 ` Kumar Gala
2007-01-15 6:37 ` Zhu Ebony-r57400
2007-01-15 14:37 ` Kumar Gala
2007-01-16 9:54 ` Zhu Ebony-r57400
2007-01-25 8:25 ` Zhu Ebony-r57400
2007-01-25 8:28 ` Kumar Gala
2007-01-25 8:53 ` Zhu Ebony-r57400
2007-01-25 15:10 ` Kumar Gala
2007-01-26 6:16 ` Zhu Ebony-r57400
2007-01-29 10:00 ` Zhu Ebony-r57400
2007-01-29 14:30 ` Kumar Gala
2007-01-31 9:45 ` Zhu Ebony-r57400
2007-01-31 14:48 ` Kumar Gala
2007-02-01 9:35 ` Zhu Ebony-r57400
2007-02-07 5:52 ` Zhu Ebony-r57400
2007-02-07 7:11 ` Kumar Gala
2007-02-07 7:21 ` Zhu Ebony-r57400
2007-02-07 7:57 ` Kumar Gala
2007-02-07 8:04 ` Zhu Ebony-r57400
2007-02-08 3:50 ` [patch][0/5] powerpc V2 : " Zhu Ebony-r57400
2007-02-08 5:18 ` Kumar Gala
2007-02-08 5:40 ` Zhu Ebony-r57400
2007-02-08 7:06 ` Zhu Ebony-r57400
2007-02-08 7:15 ` Kumar Gala
2007-02-08 8:08 ` Zhu Ebony-r57400
2007-02-08 17:18 ` Kumar Gala
2007-02-09 5:15 ` Zhu Ebony-r57400
2007-07-30 14:56 ` Sergei Shtylyov
2007-07-31 3:36 ` Zhu Ebony-r57400
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