Home | History | Annotate | Line # | Download | only in src
w_logf.c revision 1.5 
      1 /* w_logf.c -- float version of w_log.c.
      2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian (at) 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 1.5 1999/07/02 15:37:45 simonb Exp $");
     19 #endif
     20 
     21 /*
     22  * wrapper logf(x)
     23  */
     24 
     25 #include "math.h"
     26 #include "math_private.h"
     27 
     28 
     29 #ifdef __STDC__
     30 	float logf(float x)		/* wrapper logf */
     31 #else
     32 	float logf(x)			/* wrapper logf */
     33 	float x;
     34 #endif
     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