[Bug 253313] lib/msun: hypotl(3) mishandles subnormal numbers

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253313

--- Comment #7 from commit-hook at FreeBSD.org ---
A commit in branch stable/13 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=97232b0dc03146c0e6466a4886edaaca4f95c3a7

commit 97232b0dc03146c0e6466a4886edaaca4f95c3a7
Author:     Dimitry Andric <dim at FreeBSD.org>
AuthorDate: 2021-02-10 22:28:43 +0000
Commit:     Dimitry Andric <dim at FreeBSD.org>
CommitDate: 2021-02-18 18:08:27 +0000

    Fix incorrect hypotl(3) result with subnormal numbers

    This adjusts the factor used to scale the subnormal numbers, so it
    becomes the right value after adjusting its exponent. Thanks to Steve
    Kargl for finding the most elegant fix.

    Also enable the hypot tests, and add a test case for this bug.

    PR:             253313

    (cherry picked from commit d3338f3355a612cf385632291f46c5777bba8d18)

    Fix lib/msun/test builds on platforms without 80-bit long doubles

    After d3338f3355a612cf385632291f46c5777bba8d18, the lib/msun test case
    'hypotl_near_underflow' would fail to compile on platforms where long
    doubles weren't 80 bit, like on x86. Disable this particular test on
    such platforms for now.

    PR:             253313

    (cherry picked from commit 25120662284466ecef976df8f86e97bafdedf991)

 contrib/netbsd-tests/lib/libm/t_hypot.c | 24 ++++++++++++++++++++++++
 lib/msun/src/e_hypotl.c                 |  2 +-
 lib/msun/tests/Makefile                 |  1 +
 3 files changed, 26 insertions(+), 1 deletion(-)

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