w_logf.c (1093B)
1 /* w_logf.c -- float version of w_log.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_logf.c,v 1.7 2002/05/28 18:15:04 alfred Exp $"; 18 #endif 19 20 /* 21 * wrapper logf(x) 22 */ 23 24 #include "math.h" 25 #include "math_private.h" 26 27 28 float 29 logf(float x) /* wrapper logf */ 30 { 31 #ifdef _IEEE_LIBM 32 return __ieee754_logf(x); 33 #else 34 float z; 35 z = __ieee754_logf(x); 36 if(_LIB_VERSION == _IEEE_ || isnanf(x) || x > (float)0.0) return z; 37 if(x==(float)0.0) 38 /* logf(0) */ 39 return (float)__kernel_standard((double)x,(double)x,116); 40 else 41 /* logf(x<0) */ 42 return (float)__kernel_standard((double)x,(double)x,117); 43 #endif 44 }