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[Bug math/16531] cosine very occasionally takes an exceptionally long time
- From: "john.wilkinson at spirent dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Wed, 05 Feb 2014 21:03:50 +0000
- Subject: [Bug math/16531] cosine very occasionally takes an exceptionally long time
- Auto-submitted: auto-generated
- References: <bug-16531-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=16531
John Wilkinson <john.wilkinson at spirent dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|DUPLICATE |---
--- Comment #2 from John Wilkinson <john.wilkinson at spirent dot com> ---
I don't think this is a duplicate of bug 5997 which concerns large multiples of
PI. It looks more like a potential duplicate of bug 5781 although this seems
specific to AMD64 whilst this reported problem is on Intel i7s.
Please note this is a critical problem for those implementing high performance
real-time systems. A time of 0.15 ms is a massive amount of time for a modern
processor. There are very few numbers for which cos takes this time but they
are fatal for any guarantee of real-time performance.
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