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sincos.c

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/*
   sincos.c

   single-instruction sine and cosine function, intended to benefit
   user of chips with built-in single instructions which return the
   sine and cosine in one call.

   If no support is available, it does the trivial mapping of ANSI C
   functions.

   Modifying this file:

   If there is already a library version of sincos() for your platform,
   then copy the #ifdef PLATFORM_WITH_LIBRARY_SUPPORT section,
   change PLATFORM_WITH_LIBRARY_SUPPORT to your platform token,
   and nothing will be defined.

   If there is no software support for your platform, but the chip has
   a sincos analogy, copy the #ifdef PLATFORM_WITH_CHIP_SUPPORT section,
   change PLATFORM_WITH_CHIP_SUPPORT to your platform token, and
   implement the function with the asm keyword in assembly language.

   If there is no software or hardware support for sincos, just leave
   this file alone. You will get a multiple-call implementation.

   Modification history:

   30-Jan-1997  FMP added #ifdef __CPLUSPLUS__ around math.h include
   29-Jan-1997  FMP changed added PLATFORM_WITH_ to make more obvious
*/

/*
   Modification history:

   14-Apr-1997  FMP made C-only
   31-Mar-1997  FMP added sincos support for SunOS 4, which has _sincos
   in libm.a
   4-Nov-1996  Fred Proctor created
*/

#include <math.h>

#ifdef __GLIBC__
#define SINCOS_SUPPORT
#else

#include "sincos.h"             /* this declaration */
#endif

/* -------------------------------------------------------------------- */

/* TEMPLATES */

#ifdef PLATFORM_WITH_LIBRARY_SUPPORT /* use if sincos exists already */

#define SINCOS_SUPPORT          /* define to remove trivial implementation
                                   at end */

#endif /* #ifdef PLATFORM_WITH_LIBRARY_SUPPORT */

#ifdef PLATFORM_WITH_CHIP_SUPPORT /* use if sincos is on chip */

#define SINCOS_SUPPORT          /* define to remove trivial implementation
                                   at end */

void sincos(double x, double *s, double *c)
{
  /* use asm keyword to get at SINCOS instruction */
}

#endif /* #ifdef PLATFORM_WITH_CHIP_SUPPORT */

/* END TEMPLATES */

/* -------------------------------------------------------------------- */

/* PLATFORMS-- copy templates from above into here */

#ifdef sunos4

#define SINCOS_SUPPORT          /* define to remove trivial implementation
                                   at end */

#endif /* #ifdef PLATFORM_WITH_LIBRARY_SUPPORT */

#ifdef VXWORKS
#ifndef POWERPC

#define SINCOS_SUPPORT          /* define to remove trivial implementation
                                   at end */

#endif /* POWERPC */
#endif /* #ifdef VXWORKS */

/* END PLATFORMS */

/* -------------------------------------------------------------------- */

/* last resort- define with ANSI implementation */

#ifndef SINCOS_SUPPORT

#include <math.h>               /* sin(), cos() */

void sincos(double x, double *s, double *c)
{
  *s = sin(x);
  *c = cos(x);
}

#endif /* #ifndef SINCOS_SUPPORT */

/* -------------------------------------------------------------------- */

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