1/* s_floorl.c -- long double version of s_floor.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 * floorl(x)
22 * Return x rounded toward -inf to integral value
23 * Method:
24 * Bit twiddling.
25 */
26
27#define NO_MATH_REDIRECT
28#include <math.h>
29#include <math_private.h>
30#include <libm-alias-ldouble.h>
31#include <math-use-builtins.h>
32
33_Float128
34__floorl (_Float128 x)
35{
36#if USE_FLOORL_BUILTIN
37 return __builtin_floorl (x);
38#else
39 /* Use generic implementation. */
40 int64_t i0, i1, j0;
41 uint64_t i, j;
42 GET_LDOUBLE_WORDS64 (i0, i1, x);
43 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
44 if (j0 < 48)
45 {
46 if (j0 < 0)
47 {
48 /* return 0 * sign (x) if |x| < 1 */
49 if (i0 >= 0)
50 {
51 i0 = i1 = 0;
52 }
53 else if (((i0 & 0x7fffffffffffffffLL) | i1) != 0)
54 {
55 i0 = 0xbfff000000000000ULL;
56 i1 = 0;
57 }
58 }
59 else
60 {
61 i = (0x0000ffffffffffffULL) >> j0;
62 if (((i0 & i) | i1) == 0)
63 return x; /* x is integral */
64 if (i0 < 0)
65 i0 += (0x0001000000000000LL) >> j0;
66 i0 &= (~i);
67 i1 = 0;
68 }
69 }
70 else if (j0 > 111)
71 {
72 if (j0 == 0x4000)
73 return x + x; /* inf or NaN */
74 else
75 return x; /* x is integral */
76 }
77 else
78 {
79 i = -1ULL >> (j0 - 48);
80 if ((i1 & i) == 0)
81 return x; /* x is integral */
82 if (i0 < 0)
83 {
84 if (j0 == 48)
85 i0 += 1;
86 else
87 {
88 j = i1 + (1LL << (112 - j0));
89 if (j < i1)
90 i0 += 1 ; /* got a carry */
91 i1 = j;
92 }
93 }
94 i1 &= (~i);
95 }
96 SET_LDOUBLE_WORDS64 (x, i0, i1);
97 return x;
98#endif /* ! USE_FLOORL_BUILTIN */
99}
100libm_alias_ldouble (__floor, floor)
101