Re: To Tom Lane 2017-02-20 <>
> 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  <>

        [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:

Thanks for the input,
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