fusl/src/math/sincosl.c

#define _GNU_SOURCE
#include "libm.h"

#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
void sincosl(long double x, long double* sin, long double* cos) {
  double sind, cosd;
  sincos(x, &sind, &cosd);
  *sin = sind;
  *cos = cosd;
}
#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
void sincosl(long double x, long double* sin, long double* cos) {
  union ldshape u = {x};
  unsigned n;
  long double y[2], s, c;

  u.i.se &= 0x7fff;
  if (u.i.se == 0x7fff) {
    *sin = *cos = x - x;
    return;
  }
  if (u.f < M_PI_4) {
    if (u.i.se < 0x3fff - LDBL_MANT_DIG) {
      /* raise underflow if subnormal */
      if (u.i.se == 0)
        FORCE_EVAL(x * 0x1p-120f);
      *sin = x;
      /* raise inexact if x!=0 */
      *cos = 1.0 + x;
      return;
    }
    *sin = __sinl(x, 0, 0);
    *cos = __cosl(x, 0);
    return;
  }
  n = __rem_pio2l(x, y);
  s = __sinl(y[0], y[1], 1);
  c = __cosl(y[0], y[1]);
  switch (n & 3) {
    case 0:
      *sin = s;
      *cos = c;
      break;
    case 1:
      *sin = c;
      *cos = -s;
      break;
    case 2:
      *sin = -s;
      *cos = -c;
      break;
    case 3:
    default:
      *sin = -c;
      *cos = s;
      break;
  }
}
#endif