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[Bug math/13932] x86_64 pow unexpectedly slow for some inputs
- From: "ppluzhnikov at google dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Thu, 13 Dec 2012 18:57:52 +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
Paul Pluzhnikov <ppluzhnikov at google dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Host| |x86_64-linux-gnu
--- Comment #2 from Paul Pluzhnikov <ppluzhnikov at google dot com> 2012-12-13 18:57:52 UTC ---
(In reply to comment #1)
> I can still reproduce it with 2.12
2.12 is ancient history. Current git trunk:
# i686:
Could not get the test to work. Something appears to be broken with my
toolchain, or with trunk in i686 mode.
# x86_64:
./elf/ld.so --library-path .:math:dlfcn /tmp/test_pow64
pow(0.562500, 1.5): 0.000990 calls/usec
pow(0.563250, 1.5): 12.753271 calls/usec
ratio: 12887
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