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Date: Sat, 2 Feb 2019 21:05:13 -0500
From: Morten Welinder <mwelinder@...il.com>
To: musl@...ts.openwall.com
Subject: Re: Possible Mistype in exp.c
Thanks.
> there are no universal tests for math functions [...]
I'm painfully aware of that, :-/ However, there are a few collections
of test values out there. Of varying size and quality.
crlibm has fairly large tables of test values. See, for example,
https://github.com/taschini/crlibm/blob/master/tests/sin.testdata
John Burkardt has a pile at
http://people.sc.fsu.edu/~jburkardt/c_src/test_values/test_values.c
These tests are not ieee-854 based, but base 10. For arctanh, for
example, the test value 0.999999 really is supposed to be fraction
999999/1000000 and not whatever that rounds to as a double. That
reference value reflects that.
Testing is important. Cases in point: crlibm had a crazy return value
for expm1( 2 * -2.079401950488110); glibc 2.23 was released with a
broken cos function.
Morten
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