Bug#718577: Libc6/libm-2.17 almost two times slower than 2.13 in trigonometric calculations

[Jonathan Nieder <jrnieder@gmail.com>]

tags 718577 + upstream patch
quit

Hal BugsBuster wrote:

> Do you mean that all these catastrophic overheads are no longer
> existing in libm-2.18 ?

Yes, I believe Carlos was saying that glibc 2.18 has a fix for the
performance regression, which Debian should apply:

>> commit 2506109403de69bd454de27835d42e6eb6ec3abc
>> Author: Siddhesh Poyarekar <siddhesh@redhat.com>
>> Date:   Wed Jun 12 10:36:48 2013 +0530
>>
>>     Set/restore rounding mode only when needed
[...]
>>     So the improvements are:
>>
>>     cos: 27.9089%
>>     exp: 22.6919%
>>     pow: 4.01564%
>>     sin: 19.1585%
>>     tan: 1.96086%

Thanks for your kindness and patience, and hope that helps,
Jonathan