Revision 324006

Synchronize most of libm with head as of r323004.  This excludes a few
arch-specific updates for powerpcspe, mips and riscv, for which support
has not been merged yet.

Bump __FreeBSD_version for the addition of cacoshl, cacosl, casinhl,
casinl, catanl, catanhl, sincos, sincosf, and sincosl.

MFC r305382 (by bde):

  Add asm versions of fmod(), fmodf() and fmodl() on amd64.  Add asm
  versions of fmodf() amd fmodl() on i387.

  fmod is similar to remainder, and the C versions are 3 to 9 times
  slower than the asm versions on x86 for both, but we had the strange
  mixture of all 6 variants of remainder in asm and only 1 of 6
  variants of fmod in asm.

MFC r305384 (by bde):

  Disconnect the "optimized" asm variants of cos(), sin() and tan() from
  the build on i386.  Leave them in the source tree for regression tests.

  The asm functions were always much less accurate (by a factor of more
  than 10**18 in the worst case).  They were faster on old CPUs.  But
  with each new generation of CPUs they get relatively slower.  The
  double precision C version's average advantage is about a factor of 2
  on Haswell.

  The asm functions were already intentionally avoided in float and long
  double precision on i386 and in all precisions on amd64.  Float
  precision and amd64 give larger advantages to the C version.  The long
  double precision C code and compilers' understanding of long double
  precision are not so good, so the i387 is still slightly faster for
  long double precision, except for the unimportant subcase of huge args
  where the sub-optimal C code now somehow beats the i387 by about a
  factor of 2.

MFC r305385 (by bde):

  Oops, the previous i386 version of e_fmodf.S and e_fmodl.S was
  actually the amd64 version.

MFC r306409 (by emaste):

  libm: fix some unused variable (rcsid) and dangling else warnings

  s_{fabs,fmax,logb,scalb}{,f,l}.c may be built elsewhere with a higher
  WARNS setting.

  Reviewed by:	ed
  Sponsored by:	The FreeBSD Foundation
  Differential Revision:	https://reviews.freebsd.org/D8061

MFC r306410 (by emaste):

  libm: simplify i387 subdir logic with make's :S substitution

MFC r306527 (by emaste):

  libm: remove unused variables for LDBL_MANT_DIG != 113

  Sponsored by:	The FreeBSD Foundation

MFC r306709 (by emaste):

  libm: remove unused variables

  Sponsored by:	The FreeBSD Foundation

MFC r307066 (by br):

  Don't use fmaxl/fminl on platforms with no long double support,
  use fmax/fmin instead.

  This fixes fmaxmin test failure on MIPS64.

  Reviewed by:	emaste
  Sponsored by:	DARPA, AFRL
  Sponsored by:	HEIF5
  Differential Revision:	https://reviews.freebsd.org/D8216

MFC r308172 (by emaste):

  libm: add braces around initialization of subobjects

  This cleans up a warning when building libm at higher WARNS levels and
  makes the intent more clear. By the C standard the values are assigned
  to subobject members in order so this change introduces no functional
  change. (6.7.9 20)

  Reviewed by:	kib
  Sponsored by:	The FreeBSD Foundation
  Differential Revision:	https://reviews.freebsd.org/D8333

MFC r313761 (by mmokhi):

  Add casinl() cacosl() catanl() casinhl() cacoshl() catanhl() APIs to msun
  to improve C11 conformance.

  PR:		216850 216851 216852 216856 216857 216858
  Submitted by:	mmokhi
  Reported by:	sgk@troutmask.apl.washington.edu
  Reviewed by:	bde, mat, theraven
  Approved by:	bde (src committer), mat (mentor)
  Differential Revision:	https://reviews.freebsd.org/D9491

MFC r313863 (by mmokhi):

  Fix building of r313761 on platforms that
  `long double` is alias of `double` (MIPS, etc)

  PR:		216850 216851 216852 216856 216857 216858
  Reported by:	emsate
  Reviewed by:	bde emaste hselasky
  Approved by:	bde emaste hselasky
  Differential Revision:	https://reviews.freebsd.org/D9491

MFC r313864 (by mmokhi):

  Add documentations related to new APIs of r313761

  PR:		216850 216851 216852 216856 216857 216858
  Submitted by:	sgk@troutmask.apl.washington.edu
  Reported by:	sgk@troutmask.apl.washington.edu
  Reviewed by:	bde emaste hselasky
  Approved by:	bde emaste hselasky
  Differential Revision:	https://reviews.freebsd.org/D9491

MFC r314950 (by ngie):

  Don't expect :test_large_inputs to fail with i386 anymore

  Recent changes (maybe a side-effect of the ATF-ification in r314649)
  invalidate the failure expectation.

  PR:		205446
  Sponsored by:	Dell EMC Isilon

MFC r317349 (by pfg):

  msun: Remove trailing space in Sunsoft copyright statement.

  Submittedby:	kargl

MFC r319047 (by mmel):

  Implement sincos, sincosf, and sincosl.
  The primary benefit of these functions is that argument
  reduction is done once instead of twice in independent
  calls to sin() and cos().

  * lib/msun/Makefile:
    . Add s_sincos[fl].c to the build.
    . Add sincos.3 documentation.
    . Add appropriate MLINKS.

  * lib/msun/Symbol.map:
    . Expose sincos[fl] symbols in dynamic libm.so.

  * lib/msun/man/sincos.3:
    . Documentation for sincos[fl].

  * lib/msun/src/k_sincos.h:
    . Kernel for sincos() function.  This merges the individual kernels
      for sin() and cos().  The merger offered an opportunity to re-arrange
      the individual kernels for better performance.

  * lib/msun/src/k_sincosf.h:
     . Kernel for sincosf() function.  This merges the individual kernels
       for sinf() and cosf(). The merger offered an opportunity to re-arrange
       the individual kernels for better performance.

  * lib/msun/src/k_sincosl.h:
     . Kernel for sincosl() function.  This merges the individual kernels
       for sinl() and cosl(). The merger offered an opportunity to re-arrange
       the individual kernels for better performance.

  * lib/msun/src/math.h:
    . Add prototytpes for sincos[fl]().

  * lib/msun/src/math_private.h:
    . Add RETURNV macros.  This is needed to reset fpsetprec on I386
      hardware for a function with type void.

  * lib/msun/src/s_sincos.c:
    . Implementation of sincos() where sin() and cos() were merged into
      one routine and possibly re-arranged for better performance.

  * lib/msun/src/s_sincosf.c:
    . Implementation of sincosf() where sinf() and cosf() were merged into
      one routine and possibly re-arranged for better performance.

  * lib/msun/src/s_sincosl.c:
    . Implementation of sincosl() where sinl() and cosl() were merged into
      one routine and possibly re-arranged for better performance.

  PR:		215977, 218300
  Submitted by:	Steven G. Kargl <sgk@troutmask.apl.washington.edu>
  Differential Revision:	https://reviews.freebsd.org/D10765

MFC r321457 (by ngie):

  Mark :reduction as an expected failure

  It fails with clang 5.0+.

  PR:	220989
  Reported by:	Jenkins

MFC r322418 (by rlibby):

  lib/msun: avoid referring to broken LDBL_MAX

  LDBL_MAX is broken on i386:
  https://lists.freebsd.org/pipermail/freebsd-numerics/2012-September/000288.html

  Gcc has produced +Infinity for LDBL_MAX on i386 and amd64 with -m32
  for some time, and newer versions of gcc are now warning that the
  "floating constant exceeds range of 'long double'".  Avoid this by
  referring to half the value of LDBL_MAX instead.

  Reviewed by:	bde
  Approved by:	markj (mentor)
  Sponsored by:	Dell EMC Isilon

MFC r322435 (by rlibby):

  Revert r322418, LDBL_MAX_EXP unsuitable for macro pasting on some arches

  Either need a different way to spell HALF_LDBL_MAX, or a different way
  to spell LDBL_MAX_EXP, or a different approach.

  Reported by:	ian

MFC r322921 (by ngie):

  Revert r321457

  It doesn't fail after ^/head@r322855 (the releng_50 clang merge).

  PR:	220989