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From: "grugh at centrum dot cz" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sources.redhat.com
Subject: [Bug math/5781] Slow sine function for special values on AMD64 - second attempt
Date: Mon, 14 Jul 2008 14:17:00 -0000	[thread overview]
Message-ID: <20080714141653.16149.qmail@sourceware.org> (raw)
In-Reply-To: <20080221091038.5781.grugh@centrum.cz>


------- Additional Comments From grugh at centrum dot cz  2008-07-14 14:16 -------
I'm not the only one with such problems:
http://sources.redhat.com/bugzilla/show_bug.cgi?id=5997
I assume that for the 64-bit distribution (x86_64), it should use sin and sinf
from i386 arch (sysdeps\i386\fpu\s_sin.S and sysdeps\i386\fpu\s_sinf.S) and only
sinl implementation is explicit x86_64. But the sin and sinf are now used as
software versions (IBM library). And it's usually bit slower, sometimes MUCH
MORE slower (1000x).
IBM library is perhaps only emergency implementation (if there is no hw support)
and it's not used for "better" (<= 0.5ULP) precision.
"The First Step is to Admit You Have a Problem!"

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|INVALID                     |


http://sourceware.org/bugzilla/show_bug.cgi?id=5781

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  parent reply	other threads:[~2008-07-14 14:17 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-21  9:11 [Bug math/5781] New: " grugh at centrum dot cz
2008-02-21  9:39 ` [Bug math/5781] " jakub at redhat dot com
2008-02-21 17:10 ` joseph at codesourcery dot com
2008-02-21 17:43 ` jakub at redhat dot com
2008-02-22  9:01 ` grugh at centrum dot cz
2008-07-14 14:17 ` grugh at centrum dot cz [this message]
     [not found] <bug-5781-131@http.sourceware.org/bugzilla/>
2012-02-29 20:20 ` jsm28 at gcc dot gnu.org
2013-04-01 12:54 ` siddhesh at redhat dot com
2013-04-10  4:25 ` siddhesh at redhat dot com
2013-12-03 18:40 ` jsm28 at gcc dot gnu.org
2014-02-05 21:07 ` john.wilkinson at spirent dot com
2014-02-06  7:40 ` john.wilkinson at spirent dot com
2014-02-06 15:48 ` carlos at redhat dot com

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