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"
28 #include <math_ldbl_opt.h>
31 long double __logbl(long double x
)
33 long double __logbl(x
)
38 GET_LDOUBLE_WORDS64(hx
,lx
,x
);
39 hx
&= 0x7fffffffffffffffLL
; /* high |x| */
40 if((hx
|(lx
&0x7fffffffffffffffLL
))==0) return -1.0/fabs(x
);
41 if(hx
>=0x7ff0000000000000LL
) return x
*x
;
42 if((hx
>>=52)==0) /* IEEE 754 logb */
45 return (long double) (hx
-0x3ff);
47 long_double_symbol (libm
, __logbl
, logbl
);