/usr/lib/gcc-cross/powerpc64-linux-gnu/7/plugin/include/sbitmap.h is in gcc-7-plugin-dev-powerpc64-linux-gnu 7.3.0-16ubuntu3cross1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 | /* Simple bitmaps.
Copyright (C) 1999-2017 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_SBITMAP_H
#define GCC_SBITMAP_H
/* Implementation of sets using simple bitmap vectors.
This set representation is suitable for non-sparse sets with a known
(a priori) universe. The set is represented as a simple array of the
host's fastest unsigned integer. For a given member I in the set:
- the element for I will be at sbitmap[I / (bits per element)]
- the position for I within element is I % (bits per element)
This representation is very space-efficient for large non-sparse sets
with random access patterns.
The following operations can be performed in O(1) time:
* set_size : SBITMAP_SIZE
* member_p : bitmap_bit_p
* add_member : bitmap_set_bit
* remove_member : bitmap_clear_bit
Most other operations on this set representation are O(U) where U is
the size of the set universe:
* clear : bitmap_clear
* choose_one : bitmap_first_set_bit /
bitmap_last_set_bit
* forall : EXECUTE_IF_SET_IN_BITMAP
* set_copy : bitmap_copy
* set_intersection : bitmap_and
* set_union : bitmap_ior
* set_difference : bitmap_and_compl
* set_disjuction : (not implemented)
* set_compare : bitmap_equal_p
Some operations on 3 sets that occur frequently in data flow problems
are also implemented:
* A | (B & C) : bitmap_or_and
* A | (B & ~C) : bitmap_ior_and_compl
* A & (B | C) : bitmap_and_or
Most of the set functions have two variants: One that returns non-zero
if members were added or removed from the target set, and one that just
performs the operation without feedback. The former operations are a
bit more expensive but the result can often be used to avoid iterations
on other sets.
Allocating a bitmap is done with sbitmap_alloc, and resizing is
performed with sbitmap_resize.
The storage requirements for simple bitmap sets is O(U) where U is the
size of the set universe (colloquially the number of bits in the bitmap).
This set representation works well for relatively small data flow problems
(there are special routines for that, see sbitmap_vector_*). The set
operations can be vectorized and there is almost no computating overhead,
so that even sparse simple bitmap sets outperform dedicated sparse set
representations like linked-list bitmaps. For larger problems, the size
overhead of simple bitmap sets gets too high and other set representations
have to be used. */
#define SBITMAP_ELT_BITS (HOST_BITS_PER_WIDEST_FAST_INT * 1u)
#define SBITMAP_ELT_TYPE unsigned HOST_WIDEST_FAST_INT
struct simple_bitmap_def
{
unsigned int n_bits; /* Number of bits. */
unsigned int size; /* Size in elements. */
SBITMAP_ELT_TYPE elms[1]; /* The elements. */
};
/* Return the set size needed for N elements. */
#define SBITMAP_SET_SIZE(N) (((N) + SBITMAP_ELT_BITS - 1) / SBITMAP_ELT_BITS)
/* Return the number of bits in BITMAP. */
#define SBITMAP_SIZE(BITMAP) ((BITMAP)->n_bits)
/* Test if bit number bitno in the bitmap is set. */
static inline SBITMAP_ELT_TYPE
bitmap_bit_p (const_sbitmap map, int bitno)
{
size_t i = bitno / SBITMAP_ELT_BITS;
unsigned int s = bitno % SBITMAP_ELT_BITS;
return (map->elms[i] >> s) & (SBITMAP_ELT_TYPE) 1;
}
/* Set bit number BITNO in the sbitmap MAP. */
static inline void
bitmap_set_bit (sbitmap map, int bitno)
{
map->elms[bitno / SBITMAP_ELT_BITS]
|= (SBITMAP_ELT_TYPE) 1 << (bitno) % SBITMAP_ELT_BITS;
}
/* Reset bit number BITNO in the sbitmap MAP. */
static inline void
bitmap_clear_bit (sbitmap map, int bitno)
{
map->elms[bitno / SBITMAP_ELT_BITS]
&= ~((SBITMAP_ELT_TYPE) 1 << (bitno) % SBITMAP_ELT_BITS);
}
/* The iterator for sbitmap. */
struct sbitmap_iterator {
/* The pointer to the first word of the bitmap. */
const SBITMAP_ELT_TYPE *ptr;
/* The size of the bitmap. */
unsigned int size;
/* The current word index. */
unsigned int word_num;
/* The current bit index (not modulo SBITMAP_ELT_BITS). */
unsigned int bit_num;
/* The words currently visited. */
SBITMAP_ELT_TYPE word;
};
/* Initialize the iterator I with sbitmap BMP and the initial index
MIN. */
static inline void
bmp_iter_set_init (sbitmap_iterator *i, const_sbitmap bmp,
unsigned int min, unsigned *bit_no ATTRIBUTE_UNUSED)
{
i->word_num = min / (unsigned int) SBITMAP_ELT_BITS;
i->bit_num = min;
i->size = bmp->size;
i->ptr = bmp->elms;
if (i->word_num >= i->size)
i->word = 0;
else
i->word = (i->ptr[i->word_num]
>> (i->bit_num % (unsigned int) SBITMAP_ELT_BITS));
}
/* Return true if we have more bits to visit, in which case *N is set
to the index of the bit to be visited. Otherwise, return
false. */
static inline bool
bmp_iter_set (sbitmap_iterator *i, unsigned int *n)
{
/* Skip words that are zeros. */
for (; i->word == 0; i->word = i->ptr[i->word_num])
{
i->word_num++;
/* If we have reached the end, break. */
if (i->word_num >= i->size)
return false;
i->bit_num = i->word_num * SBITMAP_ELT_BITS;
}
/* Skip bits that are zero. */
for (; (i->word & 1) == 0; i->word >>= 1)
i->bit_num++;
*n = i->bit_num;
return true;
}
/* Advance to the next bit. */
static inline void
bmp_iter_next (sbitmap_iterator *i, unsigned *bit_no ATTRIBUTE_UNUSED)
{
i->word >>= 1;
i->bit_num++;
}
/* Loop over all elements of SBITMAP, starting with MIN. In each
iteration, N is set to the index of the bit being visited. ITER is
an instance of sbitmap_iterator used to iterate the bitmap. */
#ifndef EXECUTE_IF_SET_IN_BITMAP
/* See bitmap.h for the other definition of EXECUTE_IF_SET_IN_BITMAP. */
#define EXECUTE_IF_SET_IN_BITMAP(BITMAP, MIN, BITNUM, ITER) \
for (bmp_iter_set_init (&(ITER), (BITMAP), (MIN), &(BITNUM)); \
bmp_iter_set (&(ITER), &(BITNUM)); \
bmp_iter_next (&(ITER), &(BITNUM)))
#endif
inline void sbitmap_free (sbitmap map)
{
free (map);
}
inline void sbitmap_vector_free (sbitmap * vec)
{
free (vec);
}
extern void dump_bitmap (FILE *, const_sbitmap);
extern void debug_raw (const simple_bitmap_def &ref);
extern void debug_raw (const simple_bitmap_def *ptr);
extern void dump_bitmap_file (FILE *, const_sbitmap);
extern void debug (const simple_bitmap_def &ref);
extern void debug (const simple_bitmap_def *ptr);
extern void dump_bitmap_vector (FILE *, const char *, const char *, sbitmap *,
int);
extern sbitmap sbitmap_alloc (unsigned int);
extern sbitmap *sbitmap_vector_alloc (unsigned int, unsigned int);
extern sbitmap sbitmap_resize (sbitmap, unsigned int, int);
extern void bitmap_copy (sbitmap, const_sbitmap);
extern int bitmap_equal_p (const_sbitmap, const_sbitmap);
extern unsigned int bitmap_count_bits (const_sbitmap);
extern bool bitmap_empty_p (const_sbitmap);
extern void bitmap_clear (sbitmap);
extern void bitmap_clear_range (sbitmap, unsigned, unsigned);
extern void bitmap_set_range (sbitmap, unsigned, unsigned);
extern void bitmap_ones (sbitmap);
extern void bitmap_vector_clear (sbitmap *, unsigned int);
extern void bitmap_vector_ones (sbitmap *, unsigned int);
extern bool bitmap_ior_and_compl (sbitmap, const_sbitmap,
const_sbitmap, const_sbitmap);
extern void bitmap_and_compl (sbitmap, const_sbitmap, const_sbitmap);
extern void bitmap_not (sbitmap, const_sbitmap);
extern bool bitmap_or_and (sbitmap, const_sbitmap,
const_sbitmap, const_sbitmap);
extern bool bitmap_and_or (sbitmap, const_sbitmap,
const_sbitmap, const_sbitmap);
extern bool bitmap_intersect_p (const_sbitmap, const_sbitmap);
extern bool bitmap_and (sbitmap, const_sbitmap, const_sbitmap);
extern bool bitmap_ior (sbitmap, const_sbitmap, const_sbitmap);
extern bool bitmap_xor (sbitmap, const_sbitmap, const_sbitmap);
extern bool bitmap_subset_p (const_sbitmap, const_sbitmap);
extern int bitmap_first_set_bit (const_sbitmap);
extern int bitmap_last_set_bit (const_sbitmap);
extern void debug_bitmap (const_sbitmap);
extern sbitmap sbitmap_realloc (sbitmap, unsigned int);
/* a class that ties the lifetime of a sbitmap to its scope. */
class auto_sbitmap
{
public:
explicit auto_sbitmap (unsigned int size) :
m_bitmap (sbitmap_alloc (size)) {}
~auto_sbitmap () { sbitmap_free (m_bitmap); }
/* Allow calling sbitmap functions on our bitmap. */
operator sbitmap () { return m_bitmap; }
private:
/* Prevent making a copy that refers to our sbitmap. */
auto_sbitmap (const auto_sbitmap &);
auto_sbitmap &operator = (const auto_sbitmap &);
#if __cplusplus >= 201103L
auto_sbitmap (auto_sbitmap &&);
auto_sbitmap &operator = (auto_sbitmap &&);
#endif
/* The bitmap we are managing. */
sbitmap m_bitmap;
};
#endif /* ! GCC_SBITMAP_H */
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