w_atan2.c - vx32 - Local 9vx git repository for patches.
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       ---
       w_atan2.c (934B)
       ---
            1 /* @(#)w_atan2.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 #ifndef lint
           14 static char rcsid[] = "$FreeBSD: src/lib/msun/src/w_atan2.c,v 1.7 2002/05/28 18:15:04 alfred Exp $";
           15 #endif
           16 
           17 /*
           18  * wrapper atan2(y,x)
           19  */
           20 
           21 #include "math.h"
           22 #include "math_private.h"
           23 
           24 
           25 double
           26 atan2(double y, double x)        /* wrapper atan2 */
           27 {
           28 #ifdef _IEEE_LIBM
           29         return __ieee754_atan2(y,x);
           30 #else
           31         double z;
           32         z = __ieee754_atan2(y,x);
           33         if(_LIB_VERSION == _IEEE_||isnan(x)||isnan(y)) return z;
           34         if(x==0.0&&y==0.0) {
           35                 return __kernel_standard(y,x,3); /* atan2(+-0,+-0) */
           36         } else
           37             return z;
           38 #endif
           39 }