math/w_exp2_compat.c

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