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-barriers.h>
29#include <math_private.h>
30#include <libm-alias-ldouble.h>
31#include <math-use-builtins.h>
32
33_Float128
34__nearbyintl (_Float128 x)
35{
36#if USE_NEARBYINTL_BUILTIN
37 return __builtin_nearbyintl (x);
38#else
39 /* Use generic implementation. */
40 static const _Float128
41 TWO112[2] = {
42 L(5.19229685853482762853049632922009600E+33), /* 0x406F000000000000, 0 */
43 L(-5.19229685853482762853049632922009600E+33) /* 0xC06F000000000000, 0 */
44 };
45 fenv_t env;
46 int64_t i0, j0, sx;
47 uint64_t i1 __attribute__ ((unused));
48 _Float128 w, t;
49 GET_LDOUBLE_WORDS64 (i0, i1, x);
50 sx = (((uint64_t) i0) >> 63);
51 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
52 if (j0 < 112)
53 {
54 if (j0 < 0)
55 {
56 feholdexcept (&env);
57 w = TWO112[sx] + math_opt_barrier (x);
58 t = w - TWO112[sx];
59 math_force_eval (t);
60 fesetenv (&env);
61 GET_LDOUBLE_MSW64 (i0, t);
62 SET_LDOUBLE_MSW64 (t, (i0 & 0x7fffffffffffffffLL) | (sx << 63));
63 return t;
64 }
65 }
66 else
67 {
68 if (j0 == 0x4000)
69 return x + x; /* inf or NaN */
70 else
71 return x; /* x is integral */
72 }
73 feholdexcept (&env);
74 w = TWO112[sx] + math_opt_barrier (x);
75 t = w - TWO112[sx];
76 math_force_eval (t);
77 fesetenv (&env);
78 return t;
79#endif /* ! USE_NEARBYINTL_BUILTIN */
80}
81libm_alias_ldouble (__nearbyint, nearbyint)
82