math/w_exp2f_compat.c

   1 /*
   2  * wrapper exp2f(x)
   3  */
   4
   5 #include <math.h>
   6 #include <math_private.h>
   7 #include <math-svid-compat.h>
   8
   9 #if LIBM_SVID_COMPAT && SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_27)
  10 float
  11 __exp2f_compat (float x)
  12 {
  13   float z = __ieee754_exp2f (x);
  14   if (__builtin_expect (!isfinite (z) || z == 0, 0)
  15       && isfinite (x) && _LIB_VERSION != _IEEE_)
  16     /* exp2 overflow: 144, exp2 underflow: 145 */
  17     return __kernel_standard_f (x, x, 144 + !!signbit (x));
  18
  19   return z;
  20 }
  21 compat_symbol (libm, __exp2f_compat, exp2f, GLIBC_2_1);
  22 #endif