1/* s_rintl.c -- long double version of s_rint.c.
2 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
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#if defined(LIBM_SCCS) && !defined(lint)
17static char rcsid[] = "$NetBSD: $";
18#endif
19
20/*
21 * rintl(x)
22 * Return x rounded to integral value according to the prevailing
23 * rounding mode.
24 * Method:
25 * Using floating addition.
26 * Exception:
27 * Inexact flag raised if x not equal to rintl(x).
28 */
29
30#include <math.h>
31#include <math_private.h>
32
33static const _Float128
34TWO112[2]={
35 5.19229685853482762853049632922009600E+33L, /* 0x406F000000000000, 0 */
36 -5.19229685853482762853049632922009600E+33L /* 0xC06F000000000000, 0 */
37};
38
39_Float128 __rintl(_Float128 x)
40{
41 int64_t i0,j0,sx;
42 u_int64_t i1 __attribute__ ((unused));
43 _Float128 w,t;
44 GET_LDOUBLE_WORDS64(i0,i1,x);
45 sx = (((u_int64_t)i0)>>63);
46 j0 = ((i0>>48)&0x7fff)-0x3fff;
47 if(j0<112) {
48 if(j0<0) {
49 w = TWO112[sx]+x;
50 t = w-TWO112[sx];
51 GET_LDOUBLE_MSW64(i0,t);
52 SET_LDOUBLE_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63));
53 return t;
54 }
55 } else {
56 if(j0==0x4000) return x+x; /* inf or NaN */
57 else return x; /* x is integral */
58 }
59 w = TWO112[sx]+x;
60 return w-TWO112[sx];
61}
62weak_alias (__rintl, rintl)
63