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      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 #include <sys/cdefs.h>
     14 #if defined(LIBM_SCCS) && !defined(lint)
     15 __RCSID("$NetBSD: w_sqrt.c,v 1.10 2013/11/19 19:24:34 joerg Exp $");
     16 #endif
     17 
     18 /*
     19  * wrapper sqrt(x)
     20  */
     21 
     22 #include "namespace.h"
     23 #include "math.h"
     24 #include "math_private.h"
     25 
     26 #ifndef __HAVE_LONG_DOUBLE
     27 __strong_alias(_sqrtl, sqrt)
     28 __weak_alias(sqrtl, _sqrtl)
     29 #endif
     30 
     31 double
     32 sqrt(double x)		/* wrapper sqrt */
     33 {
     34 #ifdef _IEEE_LIBM
     35 	return __ieee754_sqrt(x);
     36 #else
     37 	double z;
     38 	z = __ieee754_sqrt(x);
     39 	if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
     40 	if(x<0.0) {
     41 	    return __kernel_standard(x,x,26); /* sqrt(negative) */
     42 	} else
     43 	    return z;
     44 #endif
     45 }
     46