1 /* s_logbl.c -- long double version of s_logb.c.
2 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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
13 * ====================================================
16 #if defined(LIBM_SCCS) && !defined(lint)
17 static char rcsid[] = "$NetBSD: $";
21 * long double logbl(x)
22 * IEEE 754 logb. Included to pass IEEE test suite. Not recommend.
27 #include "math_private.h"
30 long double __logbl(long double x)
32 long double __logbl(x)
37 GET_LDOUBLE_WORDS64(hx,lx,x);
38 hx &= 0x7fffffffffffffffLL; /* high |x| */
39 if((hx|lx)==0) return -1.0/fabs(x);
40 if(hx>=0x7fff000000000000LL) return x*x;
41 if((hx>>=48)==0) /* IEEE 754 logb */
44 return (long double) (hx-0x3fff);
46 weak_alias (__logbl, logbl)