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 #include <sys/cdefs.h> 17 #if defined(LIBM_SCCS) && !defined(lint) 18 __RCSID("$NetBSD: w_logf.c,v 1.7 2007/08/20 16:01:40 drochner Exp $"); 19 #endif 20 21 /* 22 * wrapper logf(x) 23 */ 24 25 #include "namespace.h" 26 #include "math.h" 27 #include "math_private.h" 28 29 #ifdef __weak_alias 30 __weak_alias(logf, _logf) 31 #endif 32 33 float 34 logf(float x) /* wrapper logf */ 35 { 36 #ifdef _IEEE_LIBM 37 return __ieee754_logf(x); 38 #else 39 float z; 40 z = __ieee754_logf(x); 41 if(_LIB_VERSION == _IEEE_ || isnanf(x) || x > (float)0.0) return z; 42 if(x==(float)0.0) 43 /* logf(0) */ 44 return (float)__kernel_standard((double)x,(double)x,116); 45 else 46 /* logf(x<0) */ 47 return (float)__kernel_standard((double)x,(double)x,117); 48 #endif 49 } 50