sinl.c raw

   1  #include "libm.h"
   2  
   3  #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
   4  long double sinl(long double x)
   5  {
   6  	return sin(x);
   7  }
   8  #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
   9  long double sinl(long double x)
  10  {
  11  	union ldshape u = {x};
  12  	unsigned n;
  13  	long double y[2], hi, lo;
  14  
  15  	u.i.se &= 0x7fff;
  16  	if (u.i.se == 0x7fff)
  17  		return x - x;
  18  	if (u.f < M_PI_4) {
  19  		if (u.i.se < 0x3fff - LDBL_MANT_DIG/2) {
  20  			/* raise inexact if x!=0 and underflow if subnormal */
  21  			FORCE_EVAL(u.i.se == 0 ? x*0x1p-120f : x+0x1p120f);
  22  			return x;
  23  		}
  24  		return __sinl(x, 0.0, 0);
  25  	}
  26  	n = __rem_pio2l(x, y);
  27  	hi = y[0];
  28  	lo = y[1];
  29  	switch (n & 3) {
  30  	case 0:
  31  		return __sinl(hi, lo, 1);
  32  	case 1:
  33  		return __cosl(hi, lo);
  34  	case 2:
  35  		return -__sinl(hi, lo, 1);
  36  	case 3:
  37  	default:
  38  		return -__cosl(hi, lo);
  39  	}
  40  }
  41  #endif
  42