math/w_sqrtf.c

   1 /* w_sqrtf.c -- float version of w_sqrt.c.
   2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
   3  */
   4
   5 /*
   6  * ====================================================
   7  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   8  *
   9  * Developed at SunPro, a Sun Microsystems, Inc. business.
  10  * Permission to use, copy, modify, and distribute this
  11  * software is freely granted, provided that this notice
  12  * is preserved.
  13  * ====================================================
  14  */
  15
  16 #if defined(LIBM_SCCS) && !defined(lint)
  17 static char rcsid[] = "$NetBSD: w_sqrtf.c,v 1.3 1995/05/10 20:49:59 jtc Exp $";
  18 #endif
  19
  20 /*
  21  * wrapper sqrtf(x)
  22  */
  23
  24 #include <math.h>
  25 #include "math_private.h"
  26
  27 #ifdef __STDC__
  28         float __sqrtf(float x)          /* wrapper sqrtf */
  29 #else
  30         float sqrt(x)                   /* wrapper sqrtf */
  31         float x;
  32 #endif
  33 {
  34 #ifdef _IEEE_LIBM
  35         return __ieee754_sqrtf(x);
  36 #else
  37         float z;
  38         z = __ieee754_sqrtf(x);
  39         if(_LIB_VERSION == _IEEE_ || __isnanf(x)) return z;
  40         if(x<(float)0.0) {
  41             /* sqrtf(negative) */
  42             return (float)__kernel_standard((double)x,(double)x,126);
  43         } else
  44             return z;
  45 #endif
  46 }
  47 weak_alias (__sqrtf, sqrtf)