MFC r327400 (by eadler):

cacos(3): correct spelling of 'I'

In some cases we had 'i' instead of 'I'.

PR: 195517
Submitted by: stephen

MFC r329259 (by eadler):

msun: signed overflow in atan2

As a component of atan2(y, x), the case of x == 1.0 is farmed out to
atan(y). The current implementation of this comparison is vulnerable
to signed integer underflow (that is, undefined behavior), and it's
performed in a somewhat more complicated way than it need be. Change
it to not be quite so cute, rather directly comparing the high/low
bits of x to the specific IEEE-754 bit pattern that encodes 1.0.

Note that while there are three different e_atan* files in the
relevant directory, only this one needs fixing. e_atan2f.c already
compares against the full bit pattern encoding 1.0f, while
e_atan2l.cuses bitwise-ands/ors/nots and so doesn't require a change.

Closes #130

Submitted by: Jeff Walden (@jswalden github PR #130)
Reviewed by: bde

MFC r334721 (by cem):

clog.3, complex.3: Fix typos and igor style issues

PR: 228783
Reported by: Karsten <freebsd-bugzilla AT kkoenig.net>

MFC r336299 (by mmacy):

msun: add ld80/ld128 powl, cpow, cpowf, cpowl from openbsd

This corresponds to the latest status (hasn't changed in 9+
years) from openbsd of ld80/ld128 powl, and source cpowf, cpow,
cpowl (the complex power functions for float complex, double
complex, and long double complex) which are required for C99
compliance and were missing from FreeBSD. Also required for
some numerical codes using complex numbered Hamiltonians.

Thanks to jhb for tracking down the issue with making
weak_reference compile on powerpc.

When asked to review, bde said "I don't like it" - but
provided no actionable feedback or superior implementations.

Discussed with: jhb
Submitted by: jmd
Differential Revision: https://reviews.freebsd.org/D15919

MFC r336563:

Recommit r336497: Fix powl, cpow, cpowf, and cpowl imports from OpenBSD

This is a follow-up to r336299.

• lib/msun/Makefile: . Remove polevll.c

• lib/msun/ld80/e_powl.c: . Copy contents of polevll.c to here. This is the only consumer of these functions. Make functions 'static inline'. . Make reducl a 'static inline' function.

• lib/msun/man/exp.3: . Remove BUGS section that no longer applies.

• lib/msun/src/math_private.h: . Remove prototypes of p1evll() and polevll()

• lib/msun/src/s_cpow.c:
• lib/msun/src/s_cpowf.c:
• lib/msun/src/s_cpowl.c . Include math_private.h. . Use the CMPLX macro from either C99 or math_private.h (depends on compiler support) instead of the problematic use of complex I.

Submitted by: Steve Kargl <sgk@troutmask.apl.washington.edu>
PR: 229876