Re: CVS commit: src/tests/lib/libc/locale

[Robert Elz <kre%munnari.OZ.AU@localhost>]

    Date:        Wed, 29 Nov 2017 06:12:02 +0000
    From:        Taylor R Campbell <campbell+netbsd-source-changes-d%mumble.net@localhost>
    Message-ID:  <20171129061642.E8DCB603BF%jupiter.mumble.net@localhost>

  | That's pretty interesting!

That is what I thought, it was certainly not what I expected.

  | Can you reproduce it in a small isolated program like the attached
  | one?

I will try later today, but I think I'll try something simpler first.

Since we know what bit pattern is in the variables, it should
be possible to simply start with values containing those patterns,
and just compare, & subtract, and see what happens.

The strtod() and setlocale() are most likely just window dressing,
and would make determining what is going on more difficult, unless
they do turn out to be affecting things.

I doubt there is anything very subtle (as in which addresses happen
to be used, or whatever) - this test has undergone significant alterations,
and it keeps behaving exactly the same way, every time, on i386 (and
what I also wasn't sure would happen, on "real" i386 (or as real as Xen
approximates, which for floating point, should be quite good) and on
qemu (we should see the results from that sometime tomorrow.)

kre