musl - new exp fails erfc in libc-test

Date: Wed, 7 Aug 2019 17:47:54 -0700
From: Dan Gohman <sunfish@...illa.com>
To: musl@...ts.openwall.com
Subject: new exp fails erfc in libc-test

As of the patch which introduced the new exp implementations:

http://git.musl-libc.org/cgit/musl/commit/?id=e16f7b3c02e17d0ace779a11f0d53a9c05fdd434

I am seeing a test failure in the erfc test in libc-test on at least x86-64
(erfc calls exp internally):

src/math/special/erfc.h:6: RN erfc(0x1.5db559fe5c0bap+0) want
0x1.b53cf571d328fp-5 got 0x1.b53cf571d328cp-5 ulperr -2.609 = -0x1.8p+1 +
0x1.900982p-2

Please let me know if there's any other information which would be useful.

Dan

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