[Bug 218300] [LIBM] implementations of sincos, sincosf, and sincosl

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218300

            Bug ID: 218300
           Summary: [LIBM] implementations of sincos, sincosf, and sincosl
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: standards
          Assignee: freebsd-standards at FreeBSD.org
          Reporter: sgk at troutmask.apl.washington.edu

Created attachment 181395
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=181395&action=edit
patch

The attached patch implements 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.

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