Re: To Tom Lane 2017-02-20 <20170220161556.5ukosuj5o572b...@msg.credativ.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 <jos...@codesourcery.com>
[BZ #17964]
* sysdeps/powerpc/fpu/e_sqrt.c (__slow_ieee754_sqrt): Use
__builtin_fma instead of relying on contraction of a * b + c.
https://anonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie&id=b26c084f6eba0057b1cd93e0caf424a1d06bd97e
(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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