1 /* s_logbl.c -- long double version of s_logb.c.
2 * Conversion to long double by Ulrich Drepper,
3 * Cygnus Support, drepper@cygnus.com.
7 * ====================================================
8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
10 * Developed at SunPro, a Sun Microsystems, Inc. business.
11 * Permission to use, copy, modify, and distribute this
12 * software is freely granted, provided that this notice
14 * ====================================================
17 #if defined(LIBM_SCCS) && !defined(lint)
18 static char rcsid
[] = "$NetBSD: $";
22 * long double logbl(x)
23 * IEEE 754 logb. Included to pass IEEE test suite. Not recommend.
28 #include "math_private.h"
31 long double __logbl(long double x
)
33 long double __logbl(x
)
38 GET_LDOUBLE_WORDS(es
,ix
,lx
,x
);
39 es
&= 0x7fff; /* exponent */
40 if((es
|ix
|lx
)==0) return -1.0/fabs(x
);
41 if(es
==0x7fff) return x
*x
;
42 if(es
==0) /* IEEE 754 logb */
45 return (long double) (es
-0x3fff);
47 weak_alias (__logbl
, logbl
)