1 2 /* @(#)w_atan2.c 1.3 95/01/18 */ 3 /* 4 * ==================================================== 5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 6 * 7 * Developed at SunSoft, a Sun Microsystems, Inc. business. 8 * Permission to use, copy, modify, and distribute this 9 * software is freely granted, provided that this notice 10 * is preserved. 11 * ==================================================== 12 * 13 */ 14 15 /* 16 * wrapper ieee_atan2(y,x) 17 */ 18 19 #include "fdlibm.h" 20 21 22 #ifdef __STDC__ 23 double ieee_atan2(double y, double x) /* wrapper atan2 */ 24 #else 25 double ieee_atan2(y,x) /* wrapper atan2 */ 26 double y,x; 27 #endif 28 { 29 #ifdef _IEEE_LIBM 30 return __ieee754_atan2(y,x); 31 #else 32 double z; 33 z = __ieee754_atan2(y,x); 34 if(_LIB_VERSION == _IEEE_||ieee_isnan(x)||ieee_isnan(y)) return z; 35 if(x==0.0&&y==0.0) { 36 return __kernel_standard(y,x,3); /* ieee_atan2(+-0,+-0) */ 37 } else 38 return z; 39 #endif 40 } 41
