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 #if defined(LIBM_SCCS) && !defined(lint) 17 static char rcsid[] = "$NetBSD: w_logf.c,v 1.3 1995/05/10 20:49:40 jtc Exp $"; 18 #endif 19 20 /* 21 * wrapper logf(x) 22 */ 23 24 #include "math.h" 25 #include "math_private.h" 26 27 28 #ifdef __STDC__ 29 float logf(float x) /* wrapper logf */ 30 #else 31 float logf(x) /* wrapper logf */ 32 float x; 33 #endif 34 { 35 #ifdef _IEEE_LIBM 36 return __ieee754_logf(x); 37 #else 38 float z; 39 z = __ieee754_logf(x); 40 if(_LIB_VERSION == _IEEE_ || isnanf(x) || x > (float)0.0) return z; 41 if(x==(float)0.0) 42 /* logf(0) */ 43 return (float)__kernel_standard((double)x,(double)x,116); 44 else 45 /* logf(x<0) */ 46 return (float)__kernel_standard((double)x,(double)x,117); 47 #endif 48 } 49