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/* Simple bitmaps.

   Copyright (C) 1999, 2000, 2002, 2003, 2004, 2006, 2007, 2008

   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

/* It's not clear yet whether using bitmap.[ch] will be a win.

   It should be straightforward to convert so for now we keep things simple

   while more important issues are dealt with.  */

#define SBITMAP_ELT_BITS ((unsigned) HOST_BITS_PER_WIDEST_FAST_INT)

#define SBITMAP_ELT_TYPE unsigned HOST_WIDEST_FAST_INT

/* Can't use SBITMAP_ELT_BITS in this macro because it contains a

   cast.  There is no perfect macro in GCC to test against.  This

   suffices for roughly 99% of the hosts we run on, and the rest

   don't have 256 bit integers.  */

#if HOST_BITS_PER_WIDEST_FAST_INT > 255

#error Need to increase size of datatype used for popcount

#endif

typedef struct simple_bitmap_def

{

  unsigned char *popcount;      /* Population count.  */

  unsigned int n_bits;          /* Number of bits.  */

  unsigned int size;            /* Size in elements.  */

  SBITMAP_ELT_TYPE elms[1];     /* The elements.  */

} *sbitmap;

typedef const struct simple_bitmap_def *const_sbitmap;

typedef SBITMAP_ELT_TYPE *sbitmap_ptr;

typedef const SBITMAP_ELT_TYPE *const_sbitmap_ptr;

/* Return the set size needed for N elements.  */

#define SBITMAP_SET_SIZE(N) (((N) + SBITMAP_ELT_BITS - 1) / SBITMAP_ELT_BITS)

#define SBITMAP_SIZE_BYTES(BITMAP) ((BITMAP)->size * sizeof (SBITMAP_ELT_TYPE))

/* Test if bit number bitno in the bitmap is set.  */

#define TEST_BIT(BITMAP, BITNO) \

((BITMAP)->elms [(BITNO) / SBITMAP_ELT_BITS] >> (BITNO) % SBITMAP_ELT_BITS & 1)

/* Set bit number BITNO in the sbitmap MAP.  Updates population count

   if this bitmap has one.  */

static inline void

SET_BIT (sbitmap map, unsigned int bitno)

{

  if (map->popcount)

    {

      bool oldbit;

      oldbit = TEST_BIT (map, bitno);

      if (!oldbit)

        map->popcount[bitno / SBITMAP_ELT_BITS]++;

    }

  map->elms[bitno / SBITMAP_ELT_BITS]

    |= (SBITMAP_ELT_TYPE) 1 << (bitno) % SBITMAP_ELT_BITS;

}

/* Reset bit number BITNO in the sbitmap MAP.  Updates population

   count if this bitmap has one.  */

static inline void

RESET_BIT (sbitmap map,  unsigned int bitno)

{

  if (map->popcount)

    {

      bool oldbit;

      oldbit = TEST_BIT (map, bitno);

      if (oldbit)

        map->popcount[bitno / SBITMAP_ELT_BITS]--;

    }

  map->elms[bitno / SBITMAP_ELT_BITS]

    &= ~((SBITMAP_ELT_TYPE) 1 << (bitno) % SBITMAP_ELT_BITS);

}

/* The iterator for sbitmap.  */

typedef struct {

  /* 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;

} sbitmap_iterator;

/* Initialize the iterator I with sbitmap BMP and the initial index

   MIN.  */

static inline void

sbitmap_iter_init (sbitmap_iterator *i, const_sbitmap bmp, unsigned int min)

{

  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

sbitmap_iter_cond (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

sbitmap_iter_next (sbitmap_iterator *i)

{

  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.  */

#define EXECUTE_IF_SET_IN_SBITMAP(SBITMAP, MIN, N, ITER)        \

  for (sbitmap_iter_init (&(ITER), (SBITMAP), (MIN));           \

       sbitmap_iter_cond (&(ITER), &(N));                       \

       sbitmap_iter_next (&(ITER)))

#define EXECUTE_IF_SET_IN_SBITMAP_REV(SBITMAP, N, CODE)                 \

do {                                                                    \

  unsigned int word_num_;                                               \

  unsigned int bit_num_;                                                \

  unsigned int size_ = (SBITMAP)->size;                                 \

  SBITMAP_ELT_TYPE *ptr_ = (SBITMAP)->elms;                             \

                                                                        \

  for (word_num_ = size_; word_num_ > 0; word_num_--)                    \

    {                                                                   \

      SBITMAP_ELT_TYPE word_ = ptr_[word_num_ - 1];                     \

                                                                        \

      if (word_ != 0)                                                    \

        for (bit_num_ = SBITMAP_ELT_BITS; bit_num_ > 0; bit_num_--)      \

          {                                                             \

            SBITMAP_ELT_TYPE _mask = (SBITMAP_ELT_TYPE)1 << (bit_num_ - 1);\

                                                                        \

            if ((word_ & _mask) != 0)                                    \

              {                                                         \

                word_ &= ~ _mask;                                       \

                (N) = (word_num_ - 1) * SBITMAP_ELT_BITS + bit_num_ - 1;\

                CODE;                                                   \

                if (word_ == 0)                                          \

                  break;                                                \

              }                                                         \

          }                                                             \

    }                                                                   \

} while (0)

#define sbitmap_free(MAP)               (free((MAP)->popcount), free((MAP)))

#define sbitmap_vector_free(VEC)        free(VEC)

struct int_list;

extern void dump_sbitmap (FILE *, const_sbitmap);

extern void dump_sbitmap_file (FILE *, const_sbitmap);

extern void dump_sbitmap_vector (FILE *, const char *, const char *, sbitmap *,

                                 int);

extern sbitmap sbitmap_alloc (unsigned int);

extern sbitmap sbitmap_alloc_with_popcount (unsigned int);

extern sbitmap *sbitmap_vector_alloc (unsigned int, unsigned int);

extern sbitmap sbitmap_resize (sbitmap, unsigned int, int);

extern void sbitmap_copy (sbitmap, const_sbitmap);

extern void sbitmap_copy_n (sbitmap, const_sbitmap, unsigned int);

extern int sbitmap_equal (const_sbitmap, const_sbitmap);

extern bool sbitmap_empty_p (const_sbitmap);

extern bool sbitmap_range_empty_p (const_sbitmap, unsigned int, unsigned int);

extern void sbitmap_zero (sbitmap);

extern void sbitmap_ones (sbitmap);

extern void sbitmap_vector_zero (sbitmap *, unsigned int);

extern void sbitmap_vector_ones (sbitmap *, unsigned int);

extern void sbitmap_union_of_diff (sbitmap, const_sbitmap, const_sbitmap, const_sbitmap);

extern bool sbitmap_union_of_diff_cg (sbitmap, const_sbitmap, const_sbitmap, const_sbitmap);

extern void sbitmap_difference (sbitmap, const_sbitmap, const_sbitmap);

extern void sbitmap_not (sbitmap, const_sbitmap);

extern void sbitmap_a_or_b_and_c (sbitmap, const_sbitmap, const_sbitmap, const_sbitmap);

extern bool sbitmap_a_or_b_and_c_cg (sbitmap, const_sbitmap, const_sbitmap, const_sbitmap);

extern void sbitmap_a_and_b_or_c (sbitmap, const_sbitmap, const_sbitmap, const_sbitmap);

extern bool sbitmap_a_and_b_or_c_cg (sbitmap, const_sbitmap, const_sbitmap, const_sbitmap);

extern bool sbitmap_any_common_bits (const_sbitmap, const_sbitmap);

extern void sbitmap_a_and_b (sbitmap, const_sbitmap, const_sbitmap);

extern bool sbitmap_a_and_b_cg (sbitmap, const_sbitmap, const_sbitmap);

extern void sbitmap_a_or_b (sbitmap, const_sbitmap, const_sbitmap);

extern bool sbitmap_a_or_b_cg (sbitmap, const_sbitmap, const_sbitmap);

extern void sbitmap_a_xor_b (sbitmap, const_sbitmap, const_sbitmap);

extern bool sbitmap_a_xor_b_cg (sbitmap, const_sbitmap, const_sbitmap);

extern bool sbitmap_a_subset_b_p (const_sbitmap, const_sbitmap);

extern int sbitmap_first_set_bit (const_sbitmap);

extern int sbitmap_last_set_bit (const_sbitmap);

extern void sbitmap_intersect_of_predsucc (sbitmap, sbitmap *, int,

                                           struct int_list **);

#define sbitmap_intersect_of_predecessors  sbitmap_intersect_of_predsucc

#define sbitmap_intersect_of_successors    sbitmap_intersect_of_predsucc

extern void sbitmap_union_of_predsucc (sbitmap, sbitmap *, int,

                                       struct int_list **);

#define sbitmap_union_of_predecessors  sbitmap_union_of_predsucc

#define sbitmap_union_of_successors    sbitmap_union_of_predsucc

/* Intersection and Union of preds/succs using the new flow graph

   structure instead of the pred/succ arrays.  */

extern void sbitmap_intersection_of_succs (sbitmap, sbitmap *, int);

extern void sbitmap_intersection_of_preds (sbitmap, sbitmap *, int);

extern void sbitmap_union_of_succs (sbitmap, sbitmap *, int);

extern void sbitmap_union_of_preds (sbitmap, sbitmap *, int);

extern void debug_sbitmap (const_sbitmap);

extern sbitmap sbitmap_realloc (sbitmap, unsigned int);

extern unsigned long sbitmap_popcount(const_sbitmap, unsigned long);

extern void sbitmap_verify_popcount (const_sbitmap);

#endif /* ! GCC_SBITMAP_H */