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glibc  2.9
w_sqrtf.c
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00001 /* w_sqrtf.c -- float version of w_sqrt.c.
00002  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
00003  */
00004 
00005 /*
00006  * ====================================================
00007  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
00008  *
00009  * Developed at SunPro, a Sun Microsystems, Inc. business.
00010  * Permission to use, copy, modify, and distribute this
00011  * software is freely granted, provided that this notice 
00012  * is preserved.
00013  * ====================================================
00014  */
00015 
00016 #if defined(LIBM_SCCS) && !defined(lint)
00017 static char rcsid[] = "$NetBSD: w_sqrtf.c,v 1.3 1995/05/10 20:49:59 jtc Exp $";
00018 #endif
00019 
00020 /* 
00021  * wrapper sqrtf(x)
00022  */
00023 
00024 #include <math.h>
00025 #include "math_private.h"
00026 
00027 #ifdef __STDC__
00028        float __sqrtf(float x)             /* wrapper sqrtf */
00029 #else
00030        float sqrt(x)               /* wrapper sqrtf */
00031        float x;
00032 #endif
00033 {
00034 #ifdef _IEEE_LIBM
00035        return __ieee754_sqrtf(x);
00036 #else
00037        float z;
00038        z = __ieee754_sqrtf(x);
00039        if(_LIB_VERSION == _IEEE_ || __isnanf(x)) return z;
00040        if(x<(float)0.0) {
00041            /* sqrtf(negative) */
00042            return (float)__kernel_standard((double)x,(double)x,126);
00043        } else
00044            return z;
00045 #endif
00046 }
00047 weak_alias (__sqrtf, sqrtf)