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w_logf.c revision 1.6 
      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 1.6 2002/05/26 22:02:02 wiz Exp $");
     19 #endif
     20 
     21 /*
     22  * wrapper logf(x)
     23  */
     24 
     25 #include "math.h"
     26 #include "math_private.h"
     27 
     28 
     29 float
     30 logf(float x)		/* wrapper logf */
     31 {
     32 #ifdef _IEEE_LIBM
     33 	return __ieee754_logf(x);
     34 #else
     35 	float z;
     36 	z = __ieee754_logf(x);
     37 	if(_LIB_VERSION == _IEEE_ || isnanf(x) || x > (float)0.0) return z;
     38 	if(x==(float)0.0)
     39 	    /* logf(0) */
     40 	    return (float)__kernel_standard((double)x,(double)x,116);
     41 	else
     42 	    /* logf(x<0) */
     43 	    return (float)__kernel_standard((double)x,(double)x,117);
     44 #endif
     45 }
     46