Stromeko at nexgo.de
Fri Apr 14 06:08:56 UTC 2017
Gary E. Miller writes:
> That because a float is only 21 significant digits, the same significant
> digits as in 7FFFFC00
Nope, a float has 24 binary digits for the mantissa (including the
hidden bit), unless they changed the standard while I wasn't looking.
So there really isn't an explanation of where the extra three missing
> So somewhere netBSD is using a float instead of a double...
> Or something else that is netBSD specific...
Not necessarily. The printf conversion specifier in that test is bunk,
use %g or even better %a and specify the correct precision. Also, add
the index into the table somewhere in the output so one can see what
test was actually performed and output _all_ intermediates.
> TEST(lfpfunc, FDF_RoundTrip)../../tests/libntp/lfpfunc.c:268::FAIL:
> Expected 0.0
> Was 2147482624.0. 2147483647.500000 diff 2147482624.000000 not within 2.384186e-07
The operative number here is actually the third one (diff) and it looks
to me like op3 was zero (the conversion back from double was'#t
performed correctly). You'd likely gain more insight if you looked at
the bit pattern from temp before converting it back to double.
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