[Bug math/1163] sinf inaccurate for some inputs

["liubov.dmitrieva at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=1163

Liubov Dmitrieva <liubov.dmitrieva at gmail dot com> changed:

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--- Comment #5 from Liubov Dmitrieva <liubov.dmitrieva at gmail dot com> 2012-06-22 18:08:04 UTC ---
There are many inputs give results that are wrong by more than 1 ulp for sinf()
in sysdeps/ieee754/flt-32, and for cosf - also...

I unintentionally attached my data to another tracker: 
http://sourceware.org/bugzilla/show_bug.cgi?id=5997

Summary is: Intel proprietary test system observed ~1.4 ulp errors on usual
arguments, and observed total loss of accuracy on |x| > 1e30 for current glibc
routines which use the flt-32 C implementations

I've submitted a patch proposed new implementation which solves the issue for
all architectures with SSE2 support and significantly improves performance.

http://sourceware.org/ml/libc-alpha/2012-06/msg00624.html

I intend submit a patch with x86_64 Sse2 implementation of sinf and cosf as
well.

New Asm versions, provided by Intel, are maximum 0.500121 ulp for sinf,
0.500573 ulp for cosf.

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