js/src/fdlibm/w_atan2.c

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  16  * The Original Code is Mozilla Communicator client code, released
  17  * March 31, 1998.
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  39
  40 /* @(#)w_atan2.c 1.3 95/01/18 */
  41 /*
  42  * ====================================================
  43  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
  44  *
  45  * Developed at SunSoft, a Sun Microsystems, Inc. business.
  46  * Permission to use, copy, modify, and distribute this
  47  * software is freely granted, provided that this notice
  48  * is preserved.
  49  * ====================================================
  50  *
  51  */
  52
  53 /*
  54  * wrapper atan2(y,x)
  55  */
  56
  57 #include "fdlibm.h"
  58
  59
  60 #ifdef __STDC__
  61         double fd_atan2(double y, double x)     /* wrapper atan2 */
  62 #else
  63         double fd_atan2(y,x)                    /* wrapper atan2 */
  64         double y,x;
  65 #endif
  66 {
  67 #ifdef _IEEE_LIBM
  68         return __ieee754_atan2(y,x);
  69 #else
  70         double z;
  71         z = __ieee754_atan2(y,x);
  72         if(_LIB_VERSION == _IEEE_||fd_isnan(x)||fd_isnan(y)) return z;
  73         if(x==0.0&&y==0.0) {
  74         int err;
  75         return __kernel_standard(y,x,3,&err); /* atan2(+-0,+-0) */
  76         } else
  77             return z;
  78 #endif
  79 }