w_y0f.c (1351B)
1 /* w_y0f.c -- float version of w_y0.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_y0f.c,v 1.5 2002/05/28 18:15:04 alfred Exp $"; 18 #endif 19 20 /* 21 * wrapper y0f(float x) 22 */ 23 24 #include "math.h" 25 #include "math_private.h" 26 27 float 28 y0f(float x) /* wrapper y0f */ 29 { 30 #ifdef _IEEE_LIBM 31 return __ieee754_y0f(x); 32 #else 33 float z; 34 z = __ieee754_y0f(x); 35 if(_LIB_VERSION == _IEEE_ || isnanf(x) ) return z; 36 if(x <= (float)0.0){ 37 if(x==(float)0.0) 38 /* d= -one/(x-x); */ 39 return (float)__kernel_standard((double)x,(double)x,108); 40 else 41 /* d = zero/(x-x); */ 42 return (float)__kernel_standard((double)x,(double)x,109); 43 } 44 if(x>(float)X_TLOSS) { 45 /* y0(x>X_TLOSS) */ 46 return (float)__kernel_standard((double)x,(double)x,135); 47 } else 48 return z; 49 #endif 50 }