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e1273106 VM |
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 | 18 | */ |
08c95df8 | 19 | #include "cache.h" |
e1273106 VM |
20 | #include "ewok.h" |
21 | ||
34b935c0 JK |
22 | #define EWAH_MASK(x) ((eword_t)1 << (x % BITS_IN_EWORD)) |
23 | #define EWAH_BLOCK(x) (x / BITS_IN_EWORD) | |
e1273106 | 24 | |
14fbd260 | 25 | struct bitmap *bitmap_word_alloc(size_t word_alloc) |
e1273106 | 26 | { |
fb7dbf3e | 27 | struct bitmap *bitmap = xmalloc(sizeof(struct bitmap)); |
14fbd260 JK |
28 | bitmap->words = xcalloc(word_alloc, sizeof(eword_t)); |
29 | bitmap->word_alloc = word_alloc; | |
e1273106 VM |
30 | return bitmap; |
31 | } | |
32 | ||
14fbd260 JK |
33 | struct bitmap *bitmap_new(void) |
34 | { | |
35 | return bitmap_word_alloc(32); | |
36 | } | |
37 | ||
e1273106 VM |
38 | void bitmap_set(struct bitmap *self, size_t pos) |
39 | { | |
414382fb | 40 | size_t block = EWAH_BLOCK(pos); |
e1273106 VM |
41 | |
42 | if (block >= self->word_alloc) { | |
43 | size_t old_size = self->word_alloc; | |
14fbd260 | 44 | self->word_alloc = block ? block * 2 : 1; |
08c95df8 | 45 | REALLOC_ARRAY(self->words, self->word_alloc); |
e1273106 VM |
46 | memset(self->words + old_size, 0x0, |
47 | (self->word_alloc - old_size) * sizeof(eword_t)); | |
48 | } | |
49 | ||
414382fb | 50 | self->words[block] |= EWAH_MASK(pos); |
e1273106 VM |
51 | } |
52 | ||
cc4aa285 JK |
53 | void bitmap_unset(struct bitmap *self, size_t pos) |
54 | { | |
55 | size_t block = EWAH_BLOCK(pos); | |
56 | ||
57 | if (block < self->word_alloc) | |
58 | self->words[block] &= ~EWAH_MASK(pos); | |
59 | } | |
60 | ||
e1273106 VM |
61 | int bitmap_get(struct bitmap *self, size_t pos) |
62 | { | |
414382fb | 63 | size_t block = EWAH_BLOCK(pos); |
e1273106 | 64 | return block < self->word_alloc && |
414382fb | 65 | (self->words[block] & EWAH_MASK(pos)) != 0; |
e1273106 VM |
66 | } |
67 | ||
68 | struct ewah_bitmap *bitmap_to_ewah(struct bitmap *bitmap) | |
69 | { | |
70 | struct ewah_bitmap *ewah = ewah_new(); | |
71 | size_t i, running_empty_words = 0; | |
72 | eword_t last_word = 0; | |
73 | ||
74 | for (i = 0; i < bitmap->word_alloc; ++i) { | |
75 | if (bitmap->words[i] == 0) { | |
76 | running_empty_words++; | |
77 | continue; | |
78 | } | |
79 | ||
80 | if (last_word != 0) | |
81 | ewah_add(ewah, last_word); | |
82 | ||
83 | if (running_empty_words > 0) { | |
84 | ewah_add_empty_words(ewah, 0, running_empty_words); | |
85 | running_empty_words = 0; | |
86 | } | |
87 | ||
88 | last_word = bitmap->words[i]; | |
89 | } | |
90 | ||
91 | ewah_add(ewah, last_word); | |
92 | return ewah; | |
93 | } | |
94 | ||
95 | struct bitmap *ewah_to_bitmap(struct ewah_bitmap *ewah) | |
96 | { | |
97 | struct bitmap *bitmap = bitmap_new(); | |
98 | struct ewah_iterator it; | |
99 | eword_t blowup; | |
100 | size_t i = 0; | |
101 | ||
102 | ewah_iterator_init(&it, ewah); | |
103 | ||
104 | while (ewah_iterator_next(&blowup, &it)) { | |
08c95df8 | 105 | ALLOC_GROW(bitmap->words, i + 1, bitmap->word_alloc); |
e1273106 VM |
106 | bitmap->words[i++] = blowup; |
107 | } | |
108 | ||
109 | bitmap->word_alloc = i; | |
110 | return bitmap; | |
111 | } | |
112 | ||
113 | void bitmap_and_not(struct bitmap *self, struct bitmap *other) | |
114 | { | |
115 | const size_t count = (self->word_alloc < other->word_alloc) ? | |
116 | self->word_alloc : other->word_alloc; | |
117 | ||
118 | size_t i; | |
119 | ||
120 | for (i = 0; i < count; ++i) | |
121 | self->words[i] &= ~other->words[i]; | |
122 | } | |
123 | ||
124 | void bitmap_or_ewah(struct bitmap *self, struct ewah_bitmap *other) | |
125 | { | |
126 | size_t original_size = self->word_alloc; | |
34b935c0 | 127 | size_t other_final = (other->bit_size / BITS_IN_EWORD) + 1; |
e1273106 VM |
128 | size_t i = 0; |
129 | struct ewah_iterator it; | |
130 | eword_t word; | |
131 | ||
132 | if (self->word_alloc < other_final) { | |
133 | self->word_alloc = other_final; | |
08c95df8 | 134 | REALLOC_ARRAY(self->words, self->word_alloc); |
e1273106 VM |
135 | memset(self->words + original_size, 0x0, |
136 | (self->word_alloc - original_size) * sizeof(eword_t)); | |
137 | } | |
138 | ||
139 | ewah_iterator_init(&it, other); | |
140 | ||
141 | while (ewah_iterator_next(&word, &it)) | |
142 | self->words[i++] |= word; | |
143 | } | |
144 | ||
e1273106 VM |
145 | size_t bitmap_popcount(struct bitmap *self) |
146 | { | |
147 | size_t i, count = 0; | |
148 | ||
149 | for (i = 0; i < self->word_alloc; ++i) | |
150 | count += ewah_bit_popcount64(self->words[i]); | |
151 | ||
152 | return count; | |
153 | } | |
154 | ||
155 | int bitmap_equals(struct bitmap *self, struct bitmap *other) | |
156 | { | |
157 | struct bitmap *big, *small; | |
158 | size_t i; | |
159 | ||
160 | if (self->word_alloc < other->word_alloc) { | |
161 | small = self; | |
162 | big = other; | |
163 | } else { | |
164 | small = other; | |
165 | big = self; | |
166 | } | |
167 | ||
168 | for (i = 0; i < small->word_alloc; ++i) { | |
169 | if (small->words[i] != big->words[i]) | |
170 | return 0; | |
171 | } | |
172 | ||
173 | for (; i < big->word_alloc; ++i) { | |
174 | if (big->words[i] != 0) | |
175 | return 0; | |
176 | } | |
177 | ||
178 | return 1; | |
179 | } | |
180 | ||
181 | void bitmap_reset(struct bitmap *bitmap) | |
182 | { | |
183 | memset(bitmap->words, 0x0, bitmap->word_alloc * sizeof(eword_t)); | |
184 | } | |
185 | ||
186 | void bitmap_free(struct bitmap *bitmap) | |
187 | { | |
188 | if (bitmap == NULL) | |
189 | return; | |
190 | ||
191 | free(bitmap->words); | |
192 | free(bitmap); | |
193 | } |