lib/54232: lib/libm/t_cos:cosf_angles regression on i386

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         54232
>Category:       lib
>Synopsis:       lib/libm/t_cos:cosf_angles regression on i386
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun May 26 11:35:00 +0000 2019
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date >= 2018.11.08.20.29.37
>Organization:

>Environment:
System: NetBSD
Architecture: i386
Machine: i386
>Description:

The cosf_angles test case of the lib/libm/t_cos test program is
failing on i386, but not on amd64, since November 2018.  It started
failing some time between Nov 5 and Nov 8, during a period when the
system failed to build and/or install.

It's failing both in qemu and on real hardware:

  http://releng.netbsd.org/b5reports/i386/commits-2018.11.html#2018.11.08.20.29.37

  http://www.gson.org/netbsd/bugs/build/i386-baremetal/2019/2019.05.09.05.00.31/test.html#lib_libm_t_cos_cosf_angles

>How-To-Repeat:

Run the test on i386.

>Fix: