tanl.c raw

   1  #include "libm.h"
   2  
   3  #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
   4  long double tanl(long double x)
   5  {
   6  	return tan(x);
   7  }
   8  #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
   9  long double tanl(long double x)
  10  {
  11  	union ldshape u = {x};
  12  	long double y[2];
  13  	unsigned n;
  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 __tanl(x, 0, 0);
  25  	}
  26  	n = __rem_pio2l(x, y);
  27  	return __tanl(y[0], y[1], n&1);
  28  }
  29  #endif
  30