w_ynf.c (1330B)
1 /* w_ynf.c -- float version of w_yn.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 #ifndef lint 17 static char rcsid[] = "$FreeBSD: src/lib/msun/src/w_ynf.c,v 1.5 2002/05/28 18:15:04 alfred Exp $"; 18 #endif 19 20 #include "math.h" 21 #include "math_private.h" 22 23 float 24 ynf(int n, float x) /* wrapper ynf */ 25 { 26 #ifdef _IEEE_LIBM 27 return __ieee754_ynf(n,x); 28 #else 29 float z; 30 z = __ieee754_ynf(n,x); 31 if(_LIB_VERSION == _IEEE_ || isnanf(x) ) return z; 32 if(x <= (float)0.0){ 33 if(x==(float)0.0) 34 /* d= -one/(x-x); */ 35 return (float)__kernel_standard((double)n,(double)x,112); 36 else 37 /* d = zero/(x-x); */ 38 return (float)__kernel_standard((double)n,(double)x,113); 39 } 40 if(x>(float)X_TLOSS) { 41 /* yn(x>X_TLOSS,n) */ 42 return (float)__kernel_standard((double)n,(double)x,139); 43 } else 44 return z; 45 #endif 46 }