src/math/sincosl.c

   1 #define _GNU_SOURCE
   2 #include "libm.h"
   3
   4 #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
   5 void sincosl(long double x, long double *sin, long double *cos)
   6 {
   7         double sind, cosd;
   8         sincos(x, &sind, &cosd);
   9         *sin = sind;
  10         *cos = cosd;
  11 }
  12 #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
  13 void sincosl(long double x, long double *sin, long double *cos)
  14 {
  15         union ldshape u = {x};
  16         unsigned n;
  17         long double y[2], s, c;
  18
  19         u.i.se &= 0x7fff;
  20         if (u.i.se == 0x7fff) {
  21                 *sin = *cos = x - x;
  22                 return;
  23         }
  24         if (u.f < M_PI_4) {
  25                 if (u.i.se < 0x3fff - LDBL_MANT_DIG) {
  26                         /* raise underflow if subnormal */
  27                         if (u.i.se == 0) FORCE_EVAL(x*0x1p-120f);
  28                         *sin = x;
  29                         /* raise inexact if x!=0 */
  30                         *cos = 1.0 + x;
  31                         return;
  32                 }
  33                 *sin = __sinl(x, 0, 0);
  34                 *cos = __cosl(x, 0);
  35                 return;
  36         }
  37         n = __rem_pio2l(x, y);
  38         s = __sinl(y[0], y[1], 1);
  39         c = __cosl(y[0], y[1]);
  40         switch (n & 3) {
  41         case 0:
  42                 *sin = s;
  43                 *cos = c;
  44                 break;
  45         case 1:
  46                 *sin = c;
  47                 *cos = -s;
  48                 break;
  49         case 2:
  50                 *sin = -s;
  51                 *cos = -c;
  52                 break;
  53         case 3:
  54         default:
  55                 *sin = -c;
  56                 *cos = s;
  57                 break;
  58         }
  59 }
  60 #endif