[Bug math/5997] Very slow execution of sinf function

[Bug math/5997] Very slow execution of sinf function

[jsm28 at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=5997

Joseph Myers <jsm28 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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         AssignedTo|aj at suse dot de           |unassigned at sourceware
                   |                            |dot org

--- Comment #3 from Joseph Myers <jsm28 at gcc dot gnu.org> 2012-02-29 20:23:22 UTC ---
Confirmed with current sources.  Given that sinf is not correctly rounding (see
bug 1163) it's quite possible there is a reasonable fix that does not involve a
whole new correctly rounding implementation - although we're generally moving
away from x87 trig instructions as too inaccurate (see bug 13658).

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[Bug math/5997] Very slow execution of sinf function

[liubov.dmitrieva at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=5997

--- Comment #4 from Liubov Dmitrieva <liubov.dmitrieva at gmail dot com> 2012-06-22 17:30:32 UTC ---
Created attachment 6469
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6469
here is the log of current 2012/06/21 GLIBC IA32 sinf/cosf errors

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[Bug math/5997] Very slow execution of sinf function

[siddhesh at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=5997

Siddhesh Poyarekar <siddhesh at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |siddhesh at redhat dot com

--- Comment #5 from Siddhesh Poyarekar <siddhesh at redhat dot com> 2013-04-01 12:53:31 UTC ---
FWIW, the function now runs much faster after the multiple precision
improvements.  The worst case is only about a 100 times slower now instead of
1000 times.

I've not looked yet, but I think there is a case for capping maximum precision
for worst case computation for sin (and all trigonometric functions) as well,
so this could get even better.

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[Bug math/5997] Very slow execution of sinf function

[siddhesh at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=5997

--- Comment #6 from Siddhesh Poyarekar <siddhesh at redhat dot com> 2013-04-01 12:54:29 UTC ---
Sorry, wrong bz. Comment 5 should have gone into bug 5781.

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[Bug math/5997] Very slow execution of sinf function

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=5997

Joseph Myers <jsm28 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement

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[Bug math/5997] Very slow execution of sinf function

[neleai at seznam dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=5997

Ondrej Bilka <neleai at seznam dot cz> changed:

           What    |Removed                     |Added
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                 CC|                            |john.wilkinson at spirent dot com

--- Comment #7 from Ondrej Bilka <neleai at seznam dot cz> ---
*** Bug 16531 has been marked as a duplicate of this bug. ***

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[Bug math/5997] Very slow execution of sinf function

[grugh at centrum dot cz]

------- Additional Comments From grugh at centrum dot cz  2008-07-14 13:44 -------
I had a similar problem with sin function. The problem is connected only to
64-bit distribution.
Using of sinl function is temporary solution, but I had to call it usually this
way, because of unwanted optimizations:
volatile long double _x = x;  // x is argument for the sin function (type double)
volatile long double result = sinl(_x);
my own bug report (marked as invalid ;-( )
http://sourceware.org/bugzilla/show_bug.cgi?id=5781
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).

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[Bug math/5997] Very slow execution of sinf function

[jvdelisle at gcc dot gnu dot org]

------- Additional Comments From jvdelisle at gcc dot gnu dot org  2008-03-30 00:09 -------
On a openSUSE 11.0alpha3, x86_64, glibc 2.7 (20071106 system, the sinf() calls
the ../sysdeps/x86_64/fpu/s_sincosf.c:175 FPU function whereas on a Fedora 8
system with glibc 2.7 the ../sysdeps/ieee754/flt-32/s_sinf.c, line 29 software
implementation of sinf is called.

Any suggestions on how to fix this.  We should be using the FPU calls.

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[Bug math/5997] Very slow execution of sinf function

[fxcoudert at gcc dot gnu dot org]

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                 CC|                            |fxcoudert at gcc dot gnu dot
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