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