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w_logf.c revision 1.1 
      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 #ifndef lint
     17 static char rcsid[] = "$Id: w_logf.c,v 1.1 1994/08/10 20:35:23 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