sysdeps/libm-ieee754/w_sqrt.c

   1 /* @(#)w_sqrt.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 #if defined(LIBM_SCCS) && !defined(lint)
  14 static char rcsid[] = "$NetBSD: w_sqrt.c,v 1.6 1995/05/10 20:49:55 jtc Exp $";
  15 #endif
  16
  17 /*
  18  * wrapper sqrt(x)
  19  */
  20
  21 #include "math.h"
  22 #include "math_private.h"
  23
  24 #ifdef __STDC__
  25         double __sqrt(double x)         /* wrapper sqrt */
  26 #else
  27         double __sqrt(x)                        /* wrapper sqrt */
  28         double x;
  29 #endif
  30 {
  31 #ifdef _IEEE_LIBM
  32         return __ieee754_sqrt(x);
  33 #else
  34         double z;
  35         z = __ieee754_sqrt(x);
  36         if(_LIB_VERSION == _IEEE_ || __isnan(x)) return z;
  37         if(x<0.0) {
  38             return __kernel_standard(x,x,26); /* sqrt(negative) */
  39         } else
  40             return z;
  41 #endif
  42 }
  43 weak_alias (__sqrt, sqrt)