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| 1 | /* Basic zero byte detection. Generic C version. |
|---|---|
| 2 | Copyright (C) 2023-2024 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 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. |
| 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 |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #ifndef _STRING_FZA_H |
| 20 | #define _STRING_FZA_H 1 |
| 21 | |
| 22 | #include <string-misc.h> |
| 23 | #include <string-optype.h> |
| 24 | |
| 25 | /* The CMPBGE instruction creates a bit mask rather than a byte mask. |
| 26 | However, if we narrow find_t to either 'int' or 'uint8_t', we get |
| 27 | unnecessary truncation instructions from the 'unsigned long' type |
| 28 | returned by __builtin_alpha_cmpbge. */ |
| 29 | typedef op_t find_t; |
| 30 | |
| 31 | static __always_inline find_t |
| 32 | find_zero_all (op_t x) |
| 33 | { |
| 34 | return __builtin_alpha_cmpbge (0, x); |
| 35 | } |
| 36 | |
| 37 | static __always_inline find_t |
| 38 | find_eq_all (op_t x1, op_t x2) |
| 39 | { |
| 40 | return find_zero_all (x1 ^ x2); |
| 41 | } |
| 42 | |
| 43 | static __always_inline find_t |
| 44 | find_zero_eq_all (op_t x1, op_t x2) |
| 45 | { |
| 46 | return find_zero_all (x1) | find_zero_all (x1 ^ x2); |
| 47 | } |
| 48 | |
| 49 | static __always_inline find_t |
| 50 | find_zero_ne_all (op_t x1, op_t x2) |
| 51 | { |
| 52 | return find_zero_all (x1) | (find_zero_all (x1 ^ x2) ^ 0xff); |
| 53 | } |
| 54 | |
| 55 | /* Define the "inexact" versions in terms of the exact versions. */ |
| 56 | #define find_zero_low find_zero_all |
| 57 | #define find_eq_low find_eq_all |
| 58 | #define find_zero_eq_low find_zero_eq_all |
| 59 | |
| 60 | #endif /* _STRING_FZA_H */ |
| 61 |
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