lib/libm/src/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 #include <sys/cdefs.h>
  17 #if defined(LIBM_SCCS) && !defined(lint)
  18 __RCSID("$NetBSD: w_sqrtf.c,v 1.6 2002/05/26 22:02:03 wiz Exp $");
  19 #endif
  20
  21 /*
  22  * wrapper sqrtf(x)
  23  */
  24
  25 #include "math.h"
  26 #include "math_private.h"
  27
  28 float
  29 sqrtf(float x)          /* wrapper sqrtf */
  30 {
  31 #ifdef _IEEE_LIBM
  32         return __ieee754_sqrtf(x);
  33 #else
  34         float z;
  35         z = __ieee754_sqrtf(x);
  36         if(_LIB_VERSION == _IEEE_ || isnanf(x)) return z;
  37         if(x<(float)0.0) {
  38             /* sqrtf(negative) */
  39             return (float)__kernel_standard((double)x,(double)x,126);
  40         } else
  41             return z;
  42 #endif
  43 }