math/w_exp2l.c

   1 /*
   2  * wrapper exp2l(x)
   3  */
   4
   5 #include <float.h>
   6 #include <math.h>
   7 #include "math_private.h"
   8
   9 static const long double o_threshold = (long double) LDBL_MAX_EXP;
  10 static const long double u_threshold
  11   = (long double) (LDBL_MIN_EXP - LDBL_MANT_DIG - 1);
  12
  13 long double
  14 __exp2l (long double x)                 /* wrapper exp2l */
  15 {
  16 #ifdef _IEEE_LIBM
  17   return __ieee754_exp2l (x);
  18 #else
  19   long double z;
  20   z = __ieee754_exp2l (x);
  21   if (_LIB_VERSION != _IEEE_ && __finitel (x))
  22     {
  23       if (x > o_threshold)
  24         return __kernel_standard (x, x, 244); /* exp2l overflow */
  25       else if (x <= u_threshold)
  26         return __kernel_standard (x, x, 245); /* exp2l underflow */
  27     }
  28   return z;
  29 #endif
  30 }
  31 weak_alias (__exp2l, exp2l)