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 = (long double) LDBL_MIN_EXP;
  11
  12 long double
  13 __exp2l (long double x)                 /* wrapper exp2l */
  14 {
  15 #ifdef _IEEE_LIBM
  16   return __ieee754_exp2l (x);
  17 #else
  18   long double z;
  19   z = __ieee754_exp2l (x);
  20   if (_LIB_VERSION != _IEEE_ && __finitel (x))
  21     {
  22       if (x > o_threshold)
  23         return __kernel_standard (x, x, 244); /* exp2l overflow */
  24       else if (x < u_threshold)
  25         return __kernel_standard (x, x, 245); /* exp2l underflow */
  26     }
  27   return z;
  28 #endif
  29 }
  30 weak_alias (__exp2l, exp2l)