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w_sqrtf.c revision 1.1 
      1 /* w_sqrtf.c -- float version of w_sqrt.c.
      2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian (at) 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 #ifndef lint
     17 static char rcsid[] = "$Id: w_sqrtf.c,v 1.1 1994/08/10 20:35:53 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