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bc9f6000 | 1 | /* Truncate argument to nearest integral value not larger than the argument. |
04277e02 | 2 | Copyright (C) 1997-2019 Free Software Foundation, Inc. |
bc9f6000 UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
bc9f6000 UD |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
bc9f6000 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 17 | License along with the GNU C Library; if not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
bc9f6000 | 19 | |
7abf97be | 20 | #define NO_MATH_REDIRECT |
bc9f6000 UD |
21 | #include <math.h> |
22 | ||
1ed0291c | 23 | #include <math_private.h> |
a1132b5e | 24 | #include <libm-alias-double.h> |
bc9f6000 UD |
25 | |
26 | ||
27 | double | |
28 | __trunc (double x) | |
29 | { | |
30 | int32_t i0, j0; | |
24ab7723 | 31 | uint32_t i1; |
bc9f6000 UD |
32 | int sx; |
33 | ||
34 | EXTRACT_WORDS (i0, i1, x); | |
35 | sx = i0 & 0x80000000; | |
36 | j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; | |
37 | if (j0 < 20) | |
38 | { | |
39 | if (j0 < 0) | |
40 | /* The magnitude of the number is < 1 so the result is +-0. */ | |
41 | INSERT_WORDS (x, sx, 0); | |
42 | else | |
48252123 | 43 | INSERT_WORDS (x, sx | (i0 & ~(0x000fffff >> j0)), 0); |
bc9f6000 UD |
44 | } |
45 | else if (j0 > 51) | |
46 | { | |
47 | if (j0 == 0x400) | |
48 | /* x is inf or NaN. */ | |
49 | return x + x; | |
50 | } | |
51 | else | |
52 | { | |
53 | INSERT_WORDS (x, i0, i1 & ~(0xffffffffu >> (j0 - 20))); | |
54 | } | |
55 | ||
56 | return x; | |
57 | } | |
bdf20bea | 58 | #ifndef __trunc |
a1132b5e | 59 | libm_alias_double (__trunc, trunc) |
bc9f6000 | 60 | #endif |