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[Bug math/5781] Slow sine function for special values on AMD64 - second attempt
- From: "carlos at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Thu, 06 Feb 2014 15:48:07 +0000
- Subject: [Bug math/5781] Slow sine function for special values on AMD64 - second attempt
- Auto-submitted: auto-generated
- References: <bug-5781-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=5781
Carlos O'Donell <carlos at redhat dot com> changed:
What |Removed |Added
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CC| |carlos at redhat dot com
--- Comment #11 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to John Wilkinson from comment #9)
> I have also come across a very similar issue on i7 Intel platforms, please
> see bug 16531. Calls to cos can take around 0.15 ms, 1000 times their normal
> time, which is a serious problem for the real-time system we are developing.
The default libm functions never guarantee constant runtime. You will have this
same problem for many of the functions provided by the library.
However we are working on enhancing libm to include something like what you're
looking for. Please have look at and comment:
https://sourceware.org/glibc/wiki/libm
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