1 /* w_atan2f.c -- float version of w_atan2.c. 2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@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 #if defined(LIBM_SCCS) && !defined(lint) 17 static char rcsid[] = "$Id: w_atan2f.c,v 1.2 1994/09/22 16:45:26 jtc Exp $"; 18 #endif 19 20 /* 21 * wrapper atan2f(y,x) 22 */ 23 24 #include "math.h" 25 #include "math_private.h" 26 27 28 #ifdef __STDC__ 29 float atan2f(float y, float x) /* wrapper atan2f */ 30 #else 31 float atan2f(y,x) /* wrapper atan2 */ 32 float y,x; 33 #endif 34 { 35 #ifdef _IEEE_LIBM 36 return __ieee754_atan2f(y,x); 37 #else 38 float z; 39 z = __ieee754_atan2f(y,x); 40 if(_LIB_VERSION == _IEEE_||isnanf(x)||isnanf(y)) return z; 41 if(x==(float)0.0&&y==(float)0.0) { 42 /* atan2f(+-0,+-0) */ 43 return (float)__kernel_standard((double)y,(double)x,103); 44 } else 45 return z; 46 #endif 47 } 48