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dfd2257a | 1 | /* Round float value to long long int. |
2b778ceb | 2 | Copyright (C) 1997-2021 Free Software Foundation, Inc. |
dfd2257a | 3 | This file is part of the GNU C Library. |
dfd2257a UD |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
dfd2257a UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
dfd2257a | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
dfd2257a | 18 | |
06d97e5e JM |
19 | #include <fenv.h> |
20 | #include <limits.h> | |
dfd2257a UD |
21 | #include <math.h> |
22 | ||
1ed0291c | 23 | #include <math_private.h> |
2f49ce7d | 24 | #include <libm-alias-float.h> |
06d97e5e | 25 | #include <fix-fp-int-convert-overflow.h> |
dfd2257a UD |
26 | |
27 | ||
28 | long long int | |
29 | __llroundf (float x) | |
30 | { | |
31 | int32_t j0; | |
24ab7723 | 32 | uint32_t i; |
dfd2257a UD |
33 | long long int result; |
34 | int sign; | |
35 | ||
36 | GET_FLOAT_WORD (i, x); | |
37 | j0 = ((i >> 23) & 0xff) - 0x7f; | |
38 | sign = (i & 0x80000000) != 0 ? -1 : 1; | |
39 | i &= 0x7fffff; | |
40 | i |= 0x800000; | |
41 | ||
cc3fa755 | 42 | if (j0 < (int32_t) (8 * sizeof (long long int)) - 1) |
dfd2257a UD |
43 | { |
44 | if (j0 < 0) | |
45 | return j0 < -1 ? 0 : sign; | |
46 | else if (j0 >= 23) | |
cc3fa755 | 47 | result = (long long int) i << (j0 - 23); |
dfd2257a UD |
48 | else |
49 | { | |
50 | i += 0x400000 >> j0; | |
51 | ||
52 | result = i >> (23 - j0); | |
53 | } | |
54 | } | |
55 | else | |
56 | { | |
06d97e5e JM |
57 | #ifdef FE_INVALID |
58 | /* The number is too large. Unless it rounds to LLONG_MIN, | |
59 | FE_INVALID must be raised and the return value is | |
60 | unspecified. */ | |
61 | if (FIX_FLT_LLONG_CONVERT_OVERFLOW && x != (float) LLONG_MIN) | |
62 | { | |
63 | feraiseexcept (FE_INVALID); | |
64 | return sign == 1 ? LLONG_MAX : LLONG_MIN; | |
65 | } | |
66 | #endif | |
dfd2257a UD |
67 | return (long long int) x; |
68 | } | |
69 | ||
70 | return sign * result; | |
71 | } | |
72 | ||
2f49ce7d | 73 | libm_alias_float (__llround, llround) |