| 1 | /* Round float to integer away from zero. |
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| 2 | Copyright (C) 1997-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #define NO_MATH_REDIRECT |
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| 20 | #include <math.h> |
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| 21 | |
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| 22 | #include <math_private.h> |
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| 23 | #include <libm-alias-float.h> |
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| 24 | #include <math-use-builtins.h> |
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| 25 | |
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| 26 | |
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| 27 | float |
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| 28 | __roundf (float x) |
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| 29 | { |
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| 30 | #if USE_ROUNDF_BUILTIN |
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| 31 | return __builtin_roundf (x); |
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| 32 | #else |
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| 33 | /* Use generic implementation. */ |
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| 34 | int32_t i0, j0; |
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| 35 | |
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| 36 | GET_FLOAT_WORD (i0, x); |
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| 37 | j0 = ((i0 >> 23) & 0xff) - 0x7f; |
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| 38 | if (j0 < 23) |
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| 39 | { |
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| 40 | if (j0 < 0) |
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| 41 | { |
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| 42 | i0 &= 0x80000000; |
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| 43 | if (j0 == -1) |
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| 44 | i0 |= 0x3f800000; |
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| 45 | } |
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| 46 | else |
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| 47 | { |
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| 48 | uint32_t i = 0x007fffff >> j0; |
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| 49 | if ((i0 & i) == 0) |
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| 50 | /* X is integral. */ |
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| 51 | return x; |
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| 52 | |
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| 53 | i0 += 0x00400000 >> j0; |
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| 54 | i0 &= ~i; |
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| 55 | } |
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| 56 | } |
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| 57 | else |
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| 58 | { |
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| 59 | if (j0 == 0x80) |
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| 60 | /* Inf or NaN. */ |
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| 61 | return x + x; |
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| 62 | else |
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| 63 | return x; |
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| 64 | } |
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| 65 | |
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| 66 | SET_FLOAT_WORD (x, i0); |
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| 67 | return x; |
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| 68 | #endif /* ! USE_ROUNDF_BUILTIN */ |
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| 69 | } |
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| 70 | libm_alias_float (__round, round) |
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| 71 | |
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