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dfd2257a | 1 | /* Round float value to long int. |
688903eb | 2 | Copyright (C) 1997-2018 Free Software Foundation, Inc. |
478b92f0 | 3 | This file is part of the GNU C Library. |
dfd2257a | 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. |
28f540f4 | 5 | |
478b92f0 | 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. | |
28f540f4 | 10 | |
478b92f0 UD |
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. |
28f540f4 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 19 | |
06d97e5e JM |
20 | #include <fenv.h> |
21 | #include <limits.h> | |
dfd2257a | 22 | #include <math.h> |
28f540f4 | 23 | |
1ed0291c | 24 | #include <math_private.h> |
2f49ce7d | 25 | #include <libm-alias-float.h> |
06d97e5e | 26 | #include <fix-fp-int-convert-overflow.h> |
dfd2257a UD |
27 | |
28 | ||
29 | long int | |
30 | __lroundf (float x) | |
28f540f4 | 31 | { |
dfd2257a | 32 | int32_t j0; |
24ab7723 | 33 | uint32_t i; |
dfd2257a UD |
34 | long int result; |
35 | int sign; | |
36 | ||
37 | GET_FLOAT_WORD (i, x); | |
38 | j0 = ((i >> 23) & 0xff) - 0x7f; | |
39 | sign = (i & 0x80000000) != 0 ? -1 : 1; | |
40 | i &= 0x7fffff; | |
41 | i |= 0x800000; | |
42 | ||
cc3fa755 | 43 | if (j0 < (int32_t) (8 * sizeof (long int)) - 1) |
dfd2257a UD |
44 | { |
45 | if (j0 < 0) | |
46 | return j0 < -1 ? 0 : sign; | |
47 | else if (j0 >= 23) | |
48 | result = (long int) i << (j0 - 23); | |
49 | else | |
50 | { | |
51 | i += 0x400000 >> j0; | |
52 | ||
53 | result = i >> (23 - j0); | |
54 | } | |
55 | } | |
56 | else | |
28f540f4 | 57 | { |
06d97e5e JM |
58 | #ifdef FE_INVALID |
59 | /* The number is too large. Unless it rounds to LONG_MIN, | |
60 | FE_INVALID must be raised and the return value is | |
61 | unspecified. */ | |
62 | if (FIX_FLT_LONG_CONVERT_OVERFLOW && x != (float) LONG_MIN) | |
63 | { | |
64 | feraiseexcept (FE_INVALID); | |
65 | return sign == 1 ? LONG_MAX : LONG_MIN; | |
66 | } | |
67 | #endif | |
dfd2257a | 68 | return (long int) x; |
28f540f4 RM |
69 | } |
70 | ||
dfd2257a | 71 | return sign * result; |
28f540f4 | 72 | } |
28f540f4 | 73 | |
2f49ce7d | 74 | libm_alias_float (__lround, lround) |