| From: | Christoph Berg <christoph(dot)berg(at)credativ(dot)de> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: powerpc(32) point/polygon regression failures on Debian Jessie |
| Date: | 2017-02-21 10:05:53 |
| Message-ID: | 20170221100553.6acj65iq374cgzc5@msg.credativ.de |
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| Lists: | pgsql-hackers |
Re: To Tom Lane 2017-02-20 <20170220161556(dot)5ukosuj5o572b4rn(at)msg(dot)credativ(dot)de>
> I was compiling the program on jessie and on sid, and running the
> jessie binary on sid made it output the same as the sid binary, so the
> difference isn't in the binary, but in some system library.
Fwiw, the problem will be fixed in Jessie's glibc by backporting this update:
2015-02-12 Joseph Myers <joseph(at)codesourcery(dot)com>
[BZ #17964]
* sysdeps/powerpc/fpu/e_sqrt.c (__slow_ieee754_sqrt): Use
__builtin_fma instead of relying on contraction of a * b + c.
(Upstream it's probably one of these, didn't dig deeper:
https://sourceware.org/git/?p=glibc.git&a=search&h=HEAD&st=commit&s=__builtin_fma)
Thanks for the input,
Christoph
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