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)
  15 {
  16   if (__builtin_expect (x <= u_threshold || x > o_threshold, 0)
  17       && _LIB_VERSION != _IEEE_ && __finitel (x))
  18     /* exp2 overflow: 244, exp2 underflow: 245 */
  19     return __kernel_standard (x, x, 244 + (x <= o_threshold));
  20
  21   return __ieee754_exp2l (x);
  22 }
  23 weak_alias (__exp2l, exp2l)