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[Bug math/13932] x86_64 pow unexpectedly slow for some inputs
- From: "siddhesh at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Mon, 11 Mar 2013 06:29:10 +0000
- Subject: [Bug math/13932] x86_64 pow unexpectedly slow for some inputs
- Auto-submitted: auto-generated
- References: <bug-13932-131@http.sourceware.org/bugzilla/>
http://sourceware.org/bugzilla/show_bug.cgi?id=13932
--- Comment #5 from Siddhesh Poyarekar <siddhesh at redhat dot com> 2013-03-11 06:29:10 UTC ---
If we did, we wouldn't have had to do all those iterations at different
precision levels and the result would have been much faster :)
Nevertheless, I've added patches to master that ought to improve performance by
at least 4x in the worst case, bringing it close to mpfr performance (still
about 2x slower though). There's still scope to make it faster, which is why I
haven't closed this bug yet.
The man pages are not part of glibc, they're a separate project by themselves.
There could be a case for adding a note explaining the multiprecision fallback
(why it's there, overview, impact, etc.) in the glibc manual though.
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