math/w_hypot_compat.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 #include <math-svid-compat.h>
  20 #include <libm-alias-double.h>
  21
  22
  23 #if LIBM_SVID_COMPAT
  24 double
  25 __hypot (double x, double y)
  26 {
  27         double z = __ieee754_hypot(x,y);
  28         if(__builtin_expect(!isfinite(z), 0)
  29            && isfinite(x) && isfinite(y) && _LIB_VERSION != _IEEE_)
  30             return __kernel_standard(x, y, 4); /* hypot overflow */
  31
  32         return z;
  33 }
  34 libm_alias_double (__hypot, hypot)
  35 #endif