libm/w_hypot.c

   1 /* @(#)w_hypot.c 5.1 93/09/24 */
   2 /*
   3  * ====================================================
   4  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   5  *
   6  * Developed at SunPro, a Sun Microsystems, Inc. business.
   7  * Permission to use, copy, modify, and distribute this
   8  * software is freely granted, provided that this notice
   9  * is preserved.
  10  * ====================================================
  11  */
  12
  13 /*
  14  * wrapper hypot(x,y)
  15  */
  16
  17 #include <math.h>
  18 #include "math_private.h"
  19
  20 double
  21 hypot (double x, double y)
  22 {
  23 #if defined(__UCLIBC_HAS_FENV__)
  24         double z = __ieee754_hypot(x,y);
  25         if(__builtin_expect(!isfinite(z), 0)
  26            && isfinite(x) && isfinite(y) && _LIB_VERSION != _IEEE_)
  27             return __kernel_standard(x, y, 4); /* hypot overflow */
  28
  29         return z;
  30 #else
  31         return __ieee754_hypot(x,y);
  32 #endif
  33 }
  34 libm_hidden_def(hypot)