1/* s_nearbyintl.c -- long double version of s_nearbyint.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/*
17 * nearbyintl(x)
18 * Return x rounded to integral value according to the prevailing
19 * rounding mode.
20 * Method:
21 * Using floating addition.
22 * Exception:
23 * Inexact flag raised if x not equal to rintl(x).
24 */
25
26#include <fenv.h>
27#include <math.h>
28#include <math_private.h>
29
30static const _Float128
31TWO112[2]={
32 L(5.19229685853482762853049632922009600E+33), /* 0x406F000000000000, 0 */
33 L(-5.19229685853482762853049632922009600E+33) /* 0xC06F000000000000, 0 */
34};
35
36_Float128 __nearbyintl(_Float128 x)
37{
38 fenv_t env;
39 int64_t i0,j0,sx;
40 u_int64_t i1 __attribute__ ((unused));
41 _Float128 w,t;
42 GET_LDOUBLE_WORDS64(i0,i1,x);
43 sx = (((u_int64_t)i0)>>63);
44 j0 = ((i0>>48)&0x7fff)-0x3fff;
45 if(j0<112) {
46 if(j0<0) {
47 feholdexcept (&env);
48 w = TWO112[sx]+x;
49 t = w-TWO112[sx];
50 math_force_eval (t);
51 fesetenv (&env);
52 GET_LDOUBLE_MSW64(i0,t);
53 SET_LDOUBLE_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63));
54 return t;
55 }
56 } else {
57 if(j0==0x4000) return x+x; /* inf or NaN */
58 else return x; /* x is integral */
59 }
60 feholdexcept (&env);
61 w = TWO112[sx]+x;
62 t = w-TWO112[sx];
63 math_force_eval (t);
64 fesetenv (&env);
65 return t;
66}
67weak_alias (__nearbyintl, nearbyintl)
68