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1 | /** |
2 | * Copyright 2013, GitHub, Inc | |
3 | * Copyright 2009-2013, Daniel Lemire, Cliff Moon, | |
4 | * David McIntosh, Robert Becho, Google Inc. and Veronika Zenz | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version 2 | |
9 | * of the License, or (at your option) any later version. | |
10 | * | |
11 | * This program 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 | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
48425792 | 17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
e1273106 VM |
18 | */ |
19 | #ifndef __EWOK_RLW_H__ | |
20 | #define __EWOK_RLW_H__ | |
21 | ||
22 | #define RLW_RUNNING_BITS (sizeof(eword_t) * 4) | |
23 | #define RLW_LITERAL_BITS (sizeof(eword_t) * 8 - 1 - RLW_RUNNING_BITS) | |
24 | ||
25 | #define RLW_LARGEST_RUNNING_COUNT (((eword_t)1 << RLW_RUNNING_BITS) - 1) | |
26 | #define RLW_LARGEST_LITERAL_COUNT (((eword_t)1 << RLW_LITERAL_BITS) - 1) | |
27 | ||
28 | #define RLW_LARGEST_RUNNING_COUNT_SHIFT (RLW_LARGEST_RUNNING_COUNT << 1) | |
29 | ||
30 | #define RLW_RUNNING_LEN_PLUS_BIT (((eword_t)1 << (RLW_RUNNING_BITS + 1)) - 1) | |
31 | ||
32 | static int rlw_get_run_bit(const eword_t *word) | |
33 | { | |
34 | return *word & (eword_t)1; | |
35 | } | |
36 | ||
37 | static inline void rlw_set_run_bit(eword_t *word, int b) | |
38 | { | |
39 | if (b) { | |
40 | *word |= (eword_t)1; | |
41 | } else { | |
42 | *word &= (eword_t)(~1); | |
43 | } | |
44 | } | |
45 | ||
46 | static inline void rlw_xor_run_bit(eword_t *word) | |
47 | { | |
48 | if (*word & 1) { | |
49 | *word &= (eword_t)(~1); | |
50 | } else { | |
51 | *word |= (eword_t)1; | |
52 | } | |
53 | } | |
54 | ||
55 | static inline void rlw_set_running_len(eword_t *word, eword_t l) | |
56 | { | |
57 | *word |= RLW_LARGEST_RUNNING_COUNT_SHIFT; | |
58 | *word &= (l << 1) | (~RLW_LARGEST_RUNNING_COUNT_SHIFT); | |
59 | } | |
60 | ||
61 | static inline eword_t rlw_get_running_len(const eword_t *word) | |
62 | { | |
63 | return (*word >> 1) & RLW_LARGEST_RUNNING_COUNT; | |
64 | } | |
65 | ||
66 | static inline eword_t rlw_get_literal_words(const eword_t *word) | |
67 | { | |
68 | return *word >> (1 + RLW_RUNNING_BITS); | |
69 | } | |
70 | ||
71 | static inline void rlw_set_literal_words(eword_t *word, eword_t l) | |
72 | { | |
73 | *word |= ~RLW_RUNNING_LEN_PLUS_BIT; | |
74 | *word &= (l << (RLW_RUNNING_BITS + 1)) | RLW_RUNNING_LEN_PLUS_BIT; | |
75 | } | |
76 | ||
77 | static inline eword_t rlw_size(const eword_t *self) | |
78 | { | |
79 | return rlw_get_running_len(self) + rlw_get_literal_words(self); | |
80 | } | |
81 | ||
82 | struct rlw_iterator { | |
83 | const eword_t *buffer; | |
84 | size_t size; | |
85 | size_t pointer; | |
86 | size_t literal_word_start; | |
87 | ||
88 | struct { | |
89 | const eword_t *word; | |
90 | int literal_words; | |
91 | int running_len; | |
92 | int literal_word_offset; | |
93 | int running_bit; | |
94 | } rlw; | |
95 | }; | |
96 | ||
97 | void rlwit_init(struct rlw_iterator *it, struct ewah_bitmap *bitmap); | |
98 | void rlwit_discard_first_words(struct rlw_iterator *it, size_t x); | |
99 | size_t rlwit_discharge( | |
100 | struct rlw_iterator *it, struct ewah_bitmap *out, size_t max, int negate); | |
e1273106 VM |
101 | |
102 | static inline size_t rlwit_word_size(struct rlw_iterator *it) | |
103 | { | |
104 | return it->rlw.running_len + it->rlw.literal_words; | |
105 | } | |
106 | ||
107 | static inline size_t rlwit_literal_words(struct rlw_iterator *it) | |
108 | { | |
109 | return it->pointer - it->rlw.literal_words; | |
110 | } | |
111 | ||
112 | #endif |