math/w_exp2.c

   1 /*
   2  * wrapper exp2(x)
   3  */
   4
   5 #include <math.h>
   6 #include <math_private.h>
   7
   8 double
   9 __exp2 (double x)
  10 {
  11   double z = __ieee754_exp2 (x);
  12   if (__builtin_expect (!__finite (z) || z == 0, 0)
  13       && __finite (x) && _LIB_VERSION != _IEEE_)
  14     /* exp2 overflow: 44, exp2 underflow: 45 */
  15     return __kernel_standard (x, x, 44 + !!__signbit (x));
  16
  17   return z;
  18 }
  19 weak_alias (__exp2, exp2)
  20 #ifdef NO_LONG_DOUBLE
  21 strong_alias (__exp2, __exp2l)
  22 weak_alias (__exp2, exp2l)
  23 #endif