/* Functions to support general ended bitmaps.
- Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+ Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+ 2006, 2007, 2008, 2009, 2010 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 2, or (at your option) any later
+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
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#ifndef GCC_BITMAP_H
-#define GCC_BITMAP_H
+#define GCC_BITMAP_H
+#include "hashtab.h"
+#include "statistics.h"
+#include "obstack.h"
+
+/* Fundamental storage type for bitmap. */
+
+typedef unsigned long BITMAP_WORD;
+/* BITMAP_WORD_BITS needs to be unsigned, but cannot contain casts as
+ it is used in preprocessor directives -- hence the 1u. */
+#define BITMAP_WORD_BITS (CHAR_BIT * SIZEOF_LONG * 1u)
/* Number of words to use for each element in the linked list. */
#ifndef BITMAP_ELEMENT_WORDS
-#define BITMAP_ELEMENT_WORDS 2
+#define BITMAP_ELEMENT_WORDS ((128 + BITMAP_WORD_BITS - 1) / BITMAP_WORD_BITS)
#endif
-/* Number of bits in each actual element of a bitmap. We get slightly better
- code for bit % BITMAP_ELEMENT_ALL_BITS and bit / BITMAP_ELEMENT_ALL_BITS if
- bits is unsigned, assuming it is a power of 2. */
+/* Number of bits in each actual element of a bitmap. */
+
+#define BITMAP_ELEMENT_ALL_BITS (BITMAP_ELEMENT_WORDS * BITMAP_WORD_BITS)
-#define BITMAP_ELEMENT_ALL_BITS \
- ((unsigned) (BITMAP_ELEMENT_WORDS * HOST_BITS_PER_WIDE_INT))
+/* Obstack for allocating bitmaps and elements from. */
+typedef struct GTY (()) bitmap_obstack {
+ struct bitmap_element_def *elements;
+ struct bitmap_head_def *heads;
+ struct obstack GTY ((skip)) obstack;
+} bitmap_obstack;
/* Bitmap set element. We use a linked list to hold only the bits that
are set. This allows for use to grow the bitset dynamically without
- having to realloc and copy a giant bit array. The `prev' field is
- undefined for an element on the free list. */
+ having to realloc and copy a giant bit array.
-typedef struct bitmap_element_def
-{
+ The free list is implemented as a list of lists. There is one
+ outer list connected together by prev fields. Each element of that
+ outer is an inner list (that may consist only of the outer list
+ element) that are connected by the next fields. The prev pointer
+ is undefined for interior elements. This allows
+ bitmap_elt_clear_from to be implemented in unit time rather than
+ linear in the number of elements to be freed. */
+
+typedef struct GTY(()) bitmap_element_def {
struct bitmap_element_def *next; /* Next element. */
struct bitmap_element_def *prev; /* Previous element. */
unsigned int indx; /* regno/BITMAP_ELEMENT_ALL_BITS. */
- unsigned HOST_WIDE_INT bits[BITMAP_ELEMENT_WORDS]; /* Bits that are set. */
+ BITMAP_WORD bits[BITMAP_ELEMENT_WORDS]; /* Bits that are set. */
} bitmap_element;
-/* Head of bitmap linked list. */
-typedef struct bitmap_head_def {
+struct bitmap_descriptor;
+/* Head of bitmap linked list. gengtype ignores ifdefs, but for
+ statistics we need to add a bitmap descriptor pointer. As it is
+ not collected, we can just GTY((skip)) it. */
+
+typedef struct GTY(()) bitmap_head_def {
bitmap_element *first; /* First element in linked list. */
bitmap_element *current; /* Last element looked at. */
unsigned int indx; /* Index of last element looked at. */
-
-} bitmap_head, *bitmap;
-
-/* Enumeration giving the various operations we support. */
-enum bitmap_bits {
- BITMAP_AND, /* TO = FROM1 & FROM2 */
- BITMAP_AND_COMPL, /* TO = FROM1 & ~ FROM2 */
- BITMAP_IOR, /* TO = FROM1 | FROM2 */
- BITMAP_XOR, /* TO = FROM1 ^ FROM2 */
- BITMAP_IOR_COMPL /* TO = FROM1 | ~FROM2 */
-};
+ bitmap_obstack *obstack; /* Obstack to allocate elements from.
+ If NULL, then use GGC allocation. */
+#ifdef GATHER_STATISTICS
+ struct bitmap_descriptor GTY((skip)) *desc;
+#endif
+} bitmap_head;
/* Global data */
extern bitmap_element bitmap_zero_bits; /* Zero bitmap element */
+extern bitmap_obstack bitmap_default_obstack; /* Default bitmap obstack */
/* Clear a bitmap by freeing up the linked list. */
-extern void bitmap_clear PARAMS ((bitmap));
+extern void bitmap_clear (bitmap);
/* Copy a bitmap to another bitmap. */
-extern void bitmap_copy PARAMS ((bitmap, bitmap));
+extern void bitmap_copy (bitmap, const_bitmap);
/* True if two bitmaps are identical. */
-extern int bitmap_equal_p PARAMS ((bitmap, bitmap));
-
-/* Perform an operation on two bitmaps, yielding a third. */
-extern int bitmap_operation PARAMS ((bitmap, bitmap, bitmap, enum bitmap_bits));
-
-/* `or' into one bitmap the `and' of a second bitmap witih the complement
- of a third. */
-extern void bitmap_ior_and_compl PARAMS ((bitmap, bitmap, bitmap));
-
-/* Clear a single register in a register set. */
-extern void bitmap_clear_bit PARAMS ((bitmap, int));
-
-/* Set a single register in a register set. */
-extern void bitmap_set_bit PARAMS ((bitmap, int));
+extern bool bitmap_equal_p (const_bitmap, const_bitmap);
+
+/* True if the bitmaps intersect (their AND is non-empty). */
+extern bool bitmap_intersect_p (const_bitmap, const_bitmap);
+
+/* True if the complement of the second intersects the first (their
+ AND_COMPL is non-empty). */
+extern bool bitmap_intersect_compl_p (const_bitmap, const_bitmap);
+
+/* True if MAP is an empty bitmap. */
+#define bitmap_empty_p(MAP) (!(MAP)->first)
+
+/* True if the bitmap has only a single bit set. */
+extern bool bitmap_single_bit_set_p (const_bitmap);
+
+/* Count the number of bits set in the bitmap. */
+extern unsigned long bitmap_count_bits (const_bitmap);
+
+/* Boolean operations on bitmaps. The _into variants are two operand
+ versions that modify the first source operand. The other variants
+ are three operand versions that to not destroy the source bitmaps.
+ The operations supported are &, & ~, |, ^. */
+extern void bitmap_and (bitmap, const_bitmap, const_bitmap);
+extern void bitmap_and_into (bitmap, const_bitmap);
+extern bool bitmap_and_compl (bitmap, const_bitmap, const_bitmap);
+extern bool bitmap_and_compl_into (bitmap, const_bitmap);
+#define bitmap_compl_and(DST, A, B) bitmap_and_compl (DST, B, A)
+extern void bitmap_compl_and_into (bitmap, const_bitmap);
+extern void bitmap_clear_range (bitmap, unsigned int, unsigned int);
+extern void bitmap_set_range (bitmap, unsigned int, unsigned int);
+extern bool bitmap_ior (bitmap, const_bitmap, const_bitmap);
+extern bool bitmap_ior_into (bitmap, const_bitmap);
+extern void bitmap_xor (bitmap, const_bitmap, const_bitmap);
+extern void bitmap_xor_into (bitmap, const_bitmap);
+
+/* DST = A | (B & C). Return true if DST changes. */
+extern bool bitmap_ior_and_into (bitmap DST, const_bitmap B, const_bitmap C);
+/* DST = A | (B & ~C). Return true if DST changes. */
+extern bool bitmap_ior_and_compl (bitmap DST, const_bitmap A, const_bitmap B, const_bitmap C);
+/* A |= (B & ~C). Return true if A changes. */
+extern bool bitmap_ior_and_compl_into (bitmap DST, const_bitmap B, const_bitmap C);
+
+/* Clear a single bit in a bitmap. Return true if the bit changed. */
+extern bool bitmap_clear_bit (bitmap, int);
+
+/* Set a single bit in a bitmap. Return true if the bit changed. */
+extern bool bitmap_set_bit (bitmap, int);
/* Return true if a register is set in a register set. */
-extern int bitmap_bit_p PARAMS ((bitmap, int));
+extern int bitmap_bit_p (bitmap, int);
/* Debug functions to print a bitmap linked list. */
-extern void debug_bitmap PARAMS ((bitmap));
-extern void debug_bitmap_file PARAMS ((FILE *, bitmap));
+extern void debug_bitmap (const_bitmap);
+extern void debug_bitmap_file (FILE *, const_bitmap);
+
+/* Print a bitmap. */
+extern void bitmap_print (FILE *, const_bitmap, const char *, const char *);
-/* Print a bitmap */
-extern void bitmap_print PARAMS ((FILE *, bitmap, const char *, const char *));
+/* Initialize and release a bitmap obstack. */
+extern void bitmap_obstack_initialize (bitmap_obstack *);
+extern void bitmap_obstack_release (bitmap_obstack *);
+extern void bitmap_register (bitmap MEM_STAT_DECL);
+extern void dump_bitmap_statistics (void);
-/* Initialize a bitmap header. */
-extern bitmap bitmap_initialize PARAMS ((bitmap));
+/* Initialize a bitmap header. OBSTACK indicates the bitmap obstack
+ to allocate from, NULL for GC'd bitmap. */
+
+static inline void
+bitmap_initialize_stat (bitmap head, bitmap_obstack *obstack MEM_STAT_DECL)
+{
+ head->first = head->current = NULL;
+ head->obstack = obstack;
+#ifdef GATHER_STATISTICS
+ bitmap_register (head PASS_MEM_STAT);
+#endif
+}
+#define bitmap_initialize(h,o) bitmap_initialize_stat (h,o MEM_STAT_INFO)
-/* Release all memory held by bitmaps. */
-extern void bitmap_release_memory PARAMS ((void));
+/* Allocate and free bitmaps from obstack, malloc and gc'd memory. */
+extern bitmap bitmap_obstack_alloc_stat (bitmap_obstack *obstack MEM_STAT_DECL);
+#define bitmap_obstack_alloc(t) bitmap_obstack_alloc_stat (t MEM_STAT_INFO)
+extern bitmap bitmap_gc_alloc_stat (ALONE_MEM_STAT_DECL);
+#define bitmap_gc_alloc() bitmap_gc_alloc_stat (ALONE_MEM_STAT_INFO)
+extern void bitmap_obstack_free (bitmap);
/* A few compatibility/functions macros for compatibility with sbitmaps */
#define dump_bitmap(file, bitmap) bitmap_print (file, bitmap, "", "\n")
#define bitmap_zero(a) bitmap_clear (a)
-#define bitmap_a_or_b(a,b,c) bitmap_operation (a, b, c, BITMAP_IOR)
-#define bitmap_a_and_b(a,b,c) bitmap_operation (a, b, c, BITMAP_AND)
-extern int bitmap_union_of_diff PARAMS((bitmap, bitmap, bitmap, bitmap));
-extern int bitmap_first_set_bit PARAMS((bitmap));
-extern int bitmap_last_set_bit PARAMS((bitmap));
-
-/* Allocate a bitmap with oballoc. */
-#define BITMAP_OBSTACK_ALLOC(OBSTACK) \
- bitmap_initialize ((bitmap) obstack_alloc (OBSTACK, sizeof (bitmap_head)))
-
-/* Allocate a bitmap with alloca. Note alloca cannot be passed as an
- argument to a function, so we set a temporary variable to the value
- returned by alloca and pass that variable to bitmap_initialize().
- PTR is then set to the value returned from bitmap_initialize() to
- avoid having it appear more than once in case it has side effects. */
-#define BITMAP_ALLOCA(PTR) \
-do { \
- bitmap temp_bitmap_ = (bitmap) alloca (sizeof (bitmap_head)); \
- (PTR) = bitmap_initialize (temp_bitmap_); \
-} while (0)
-
-/* Allocate a bitmap with xmalloc. */
-#define BITMAP_XMALLOC() \
- bitmap_initialize ((bitmap) xmalloc (sizeof (bitmap_head)))
+extern unsigned bitmap_first_set_bit (const_bitmap);
+extern unsigned bitmap_last_set_bit (const_bitmap);
+
+/* Compute bitmap hash (for purposes of hashing etc.) */
+extern hashval_t bitmap_hash(const_bitmap);
+
+/* Allocate a bitmap from a bit obstack. */
+#define BITMAP_ALLOC(OBSTACK) bitmap_obstack_alloc (OBSTACK)
+
+/* Allocate a gc'd bitmap. */
+#define BITMAP_GGC_ALLOC() bitmap_gc_alloc ()
/* Do any cleanup needed on a bitmap when it is no longer used. */
-#define BITMAP_FREE(BITMAP) \
-do { \
- if (BITMAP) \
- { \
- bitmap_clear (BITMAP); \
- (BITMAP) = 0; \
- } \
-} while (0)
-
-/* Do any cleanup needed on an xmalloced bitmap when it is no longer used. */
-#define BITMAP_XFREE(BITMAP) \
-do { \
- if (BITMAP) \
- { \
- bitmap_clear (BITMAP); \
- free (BITMAP); \
- (BITMAP) = 0; \
- } \
-} while (0)
-
-/* Do any one-time initializations needed for bitmaps. */
-#define BITMAP_INIT_ONCE()
-
-/* Loop over all bits in BITMAP, starting with MIN, setting BITNUM to the
- bit number and executing CODE for all bits that are set. */
-
-#define EXECUTE_IF_SET_IN_BITMAP(BITMAP, MIN, BITNUM, CODE) \
-do { \
- bitmap_element *ptr_ = (BITMAP)->first; \
- unsigned int indx_ = (MIN) / BITMAP_ELEMENT_ALL_BITS; \
- unsigned bit_num_ = (MIN) % ((unsigned) HOST_BITS_PER_WIDE_INT); \
- unsigned word_num_ = (((MIN) / ((unsigned) HOST_BITS_PER_WIDE_INT)) \
- % BITMAP_ELEMENT_WORDS); \
- \
- \
- /* Find the block the minimum bit is in. */ \
- while (ptr_ != 0 && ptr_->indx < indx_) \
- ptr_ = ptr_->next; \
- \
- if (ptr_ != 0 && ptr_->indx != indx_) \
- { \
- bit_num_ = 0; \
- word_num_ = 0; \
- } \
- \
- for (; ptr_ != 0; ptr_ = ptr_->next) \
- { \
- for (; word_num_ < BITMAP_ELEMENT_WORDS; word_num_++) \
- { \
- unsigned HOST_WIDE_INT word_ = ptr_->bits[word_num_]; \
- \
- if (word_ != 0) \
- { \
- for (; bit_num_ < HOST_BITS_PER_WIDE_INT; bit_num_++) \
- { \
- unsigned HOST_WIDE_INT mask_ \
- = ((unsigned HOST_WIDE_INT) 1) << bit_num_; \
- \
- if ((word_ & mask_) != 0) \
- { \
- word_ &= ~ mask_; \
- (BITNUM) = (ptr_->indx * BITMAP_ELEMENT_ALL_BITS \
- + word_num_ * HOST_BITS_PER_WIDE_INT \
- + bit_num_); \
- CODE; \
- \
- if (word_ == 0) \
- break; \
- } \
- } \
- } \
- \
- bit_num_ = 0; \
- } \
- \
- word_num_ = 0; \
- } \
-} while (0)
-
-/* Loop over all bits in BITMAP1 and BITMAP2, starting with MIN, setting
- BITNUM to the bit number and executing CODE for all bits that are set in
- the first bitmap and not set in the second. */
-
-#define EXECUTE_IF_AND_COMPL_IN_BITMAP(BITMAP1, BITMAP2, MIN, BITNUM, CODE) \
-do { \
- bitmap_element *ptr1_ = (BITMAP1)->first; \
- bitmap_element *ptr2_ = (BITMAP2)->first; \
- unsigned int indx_ = (MIN) / BITMAP_ELEMENT_ALL_BITS; \
- unsigned bit_num_ = (MIN) % ((unsigned) HOST_BITS_PER_WIDE_INT); \
- unsigned word_num_ = (((MIN) / ((unsigned) HOST_BITS_PER_WIDE_INT)) \
- % BITMAP_ELEMENT_WORDS); \
- \
- /* Find the block the minimum bit is in in the first bitmap. */ \
- while (ptr1_ != 0 && ptr1_->indx < indx_) \
- ptr1_ = ptr1_->next; \
- \
- if (ptr1_ != 0 && ptr1_->indx != indx_) \
- { \
- bit_num_ = 0; \
- word_num_ = 0; \
- } \
- \
- for (; ptr1_ != 0 ; ptr1_ = ptr1_->next) \
- { \
- /* Advance BITMAP2 to the equivalent link, using an all \
- zero element if an equivalent link doesn't exist. */ \
- bitmap_element *tmp2_; \
- \
- while (ptr2_ != 0 && ptr2_->indx < ptr1_->indx) \
- ptr2_ = ptr2_->next; \
- \
- tmp2_ = ((ptr2_ != 0 && ptr2_->indx == ptr1_->indx) \
- ? ptr2_ : &bitmap_zero_bits); \
- \
- for (; word_num_ < BITMAP_ELEMENT_WORDS; word_num_++) \
- { \
- unsigned HOST_WIDE_INT word_ = (ptr1_->bits[word_num_] \
- & ~ tmp2_->bits[word_num_]); \
- if (word_ != 0) \
- { \
- for (; bit_num_ < HOST_BITS_PER_WIDE_INT; bit_num_++) \
- { \
- unsigned HOST_WIDE_INT mask_ \
- = ((unsigned HOST_WIDE_INT)1) << bit_num_; \
- \
- if ((word_ & mask_) != 0) \
- { \
- word_ &= ~ mask_; \
- (BITNUM) = (ptr1_->indx * BITMAP_ELEMENT_ALL_BITS \
- + word_num_ * HOST_BITS_PER_WIDE_INT \
- + bit_num_); \
- \
- CODE; \
- if (word_ == 0) \
- break; \
- } \
- } \
- } \
- \
- bit_num_ = 0; \
- } \
- \
- word_num_ = 0; \
- } \
-} while (0)
-
-/* Loop over all bits in BITMAP1 and BITMAP2, starting with MIN, setting
- BITNUM to the bit number and executing CODE for all bits that are set in
- the both bitmaps. */
-
-#define EXECUTE_IF_AND_IN_BITMAP(BITMAP1, BITMAP2, MIN, BITNUM, CODE) \
-do { \
- bitmap_element *ptr1_ = (BITMAP1)->first; \
- bitmap_element *ptr2_ = (BITMAP2)->first; \
- unsigned int indx_ = (MIN) / BITMAP_ELEMENT_ALL_BITS; \
- unsigned bit_num_ = (MIN) % ((unsigned) HOST_BITS_PER_WIDE_INT); \
- unsigned word_num_ = (((MIN) / ((unsigned) HOST_BITS_PER_WIDE_INT)) \
- % BITMAP_ELEMENT_WORDS); \
- \
- /* Find the block the minimum bit is in in the first bitmap. */ \
- while (ptr1_ != 0 && ptr1_->indx < indx_) \
- ptr1_ = ptr1_->next; \
- \
- if (ptr1_ != 0 && ptr1_->indx != indx_) \
- { \
- bit_num_ = 0; \
- word_num_ = 0; \
- } \
- \
- for (; ptr1_ != 0 ; ptr1_ = ptr1_->next) \
- { \
- /* Advance BITMAP2 to the equivalent link */ \
- while (ptr2_ != 0 && ptr2_->indx < ptr1_->indx) \
- ptr2_ = ptr2_->next; \
- \
- if (ptr2_ == 0) \
- { \
- /* If there are no more elements in BITMAP2, exit loop now.*/ \
- ptr1_ = (bitmap_element *)0; \
- break; \
- } \
- else if (ptr2_->indx > ptr1_->indx) \
- { \
- bit_num_ = word_num_ = 0; \
- continue; \
- } \
- \
- for (; word_num_ < BITMAP_ELEMENT_WORDS; word_num_++) \
- { \
- unsigned HOST_WIDE_INT word_ = (ptr1_->bits[word_num_] \
- & ptr2_->bits[word_num_]); \
- if (word_ != 0) \
- { \
- for (; bit_num_ < HOST_BITS_PER_WIDE_INT; bit_num_++) \
- { \
- unsigned HOST_WIDE_INT mask_ \
- = ((unsigned HOST_WIDE_INT)1) << bit_num_; \
- \
- if ((word_ & mask_) != 0) \
- { \
- word_ &= ~ mask_; \
- (BITNUM) = (ptr1_->indx * BITMAP_ELEMENT_ALL_BITS \
- + word_num_ * HOST_BITS_PER_WIDE_INT \
- + bit_num_); \
- \
- CODE; \
- if (word_ == 0) \
- break; \
- } \
- } \
- } \
- \
- bit_num_ = 0; \
- } \
- \
- word_num_ = 0; \
- } \
-} while (0)
+#define BITMAP_FREE(BITMAP) \
+ ((void) (bitmap_obstack_free ((bitmap) BITMAP), (BITMAP) = (bitmap) NULL))
+
+/* Iterator for bitmaps. */
+
+typedef struct
+{
+ /* Pointer to the current bitmap element. */
+ bitmap_element *elt1;
+
+ /* Pointer to 2nd bitmap element when two are involved. */
+ bitmap_element *elt2;
+
+ /* Word within the current element. */
+ unsigned word_no;
+
+ /* Contents of the actually processed word. When finding next bit
+ it is shifted right, so that the actual bit is always the least
+ significant bit of ACTUAL. */
+ BITMAP_WORD bits;
+} bitmap_iterator;
+
+/* Initialize a single bitmap iterator. START_BIT is the first bit to
+ iterate from. */
+
+static inline void
+bmp_iter_set_init (bitmap_iterator *bi, const_bitmap map,
+ unsigned start_bit, unsigned *bit_no)
+{
+ bi->elt1 = map->first;
+ bi->elt2 = NULL;
+
+ /* Advance elt1 until it is not before the block containing start_bit. */
+ while (1)
+ {
+ if (!bi->elt1)
+ {
+ bi->elt1 = &bitmap_zero_bits;
+ break;
+ }
+
+ if (bi->elt1->indx >= start_bit / BITMAP_ELEMENT_ALL_BITS)
+ break;
+ bi->elt1 = bi->elt1->next;
+ }
+
+ /* We might have gone past the start bit, so reinitialize it. */
+ if (bi->elt1->indx != start_bit / BITMAP_ELEMENT_ALL_BITS)
+ start_bit = bi->elt1->indx * BITMAP_ELEMENT_ALL_BITS;
+
+ /* Initialize for what is now start_bit. */
+ bi->word_no = start_bit / BITMAP_WORD_BITS % BITMAP_ELEMENT_WORDS;
+ bi->bits = bi->elt1->bits[bi->word_no];
+ bi->bits >>= start_bit % BITMAP_WORD_BITS;
+
+ /* If this word is zero, we must make sure we're not pointing at the
+ first bit, otherwise our incrementing to the next word boundary
+ will fail. It won't matter if this increment moves us into the
+ next word. */
+ start_bit += !bi->bits;
+
+ *bit_no = start_bit;
+}
+
+/* Initialize an iterator to iterate over the intersection of two
+ bitmaps. START_BIT is the bit to commence from. */
+
+static inline void
+bmp_iter_and_init (bitmap_iterator *bi, const_bitmap map1, const_bitmap map2,
+ unsigned start_bit, unsigned *bit_no)
+{
+ bi->elt1 = map1->first;
+ bi->elt2 = map2->first;
+
+ /* Advance elt1 until it is not before the block containing
+ start_bit. */
+ while (1)
+ {
+ if (!bi->elt1)
+ {
+ bi->elt2 = NULL;
+ break;
+ }
+
+ if (bi->elt1->indx >= start_bit / BITMAP_ELEMENT_ALL_BITS)
+ break;
+ bi->elt1 = bi->elt1->next;
+ }
+
+ /* Advance elt2 until it is not before elt1. */
+ while (1)
+ {
+ if (!bi->elt2)
+ {
+ bi->elt1 = bi->elt2 = &bitmap_zero_bits;
+ break;
+ }
+
+ if (bi->elt2->indx >= bi->elt1->indx)
+ break;
+ bi->elt2 = bi->elt2->next;
+ }
+
+ /* If we're at the same index, then we have some intersecting bits. */
+ if (bi->elt1->indx == bi->elt2->indx)
+ {
+ /* We might have advanced beyond the start_bit, so reinitialize
+ for that. */
+ if (bi->elt1->indx != start_bit / BITMAP_ELEMENT_ALL_BITS)
+ start_bit = bi->elt1->indx * BITMAP_ELEMENT_ALL_BITS;
+
+ bi->word_no = start_bit / BITMAP_WORD_BITS % BITMAP_ELEMENT_WORDS;
+ bi->bits = bi->elt1->bits[bi->word_no] & bi->elt2->bits[bi->word_no];
+ bi->bits >>= start_bit % BITMAP_WORD_BITS;
+ }
+ else
+ {
+ /* Otherwise we must immediately advance elt1, so initialize for
+ that. */
+ bi->word_no = BITMAP_ELEMENT_WORDS - 1;
+ bi->bits = 0;
+ }
+
+ /* If this word is zero, we must make sure we're not pointing at the
+ first bit, otherwise our incrementing to the next word boundary
+ will fail. It won't matter if this increment moves us into the
+ next word. */
+ start_bit += !bi->bits;
+
+ *bit_no = start_bit;
+}
+
+/* Initialize an iterator to iterate over the bits in MAP1 & ~MAP2.
+ */
+
+static inline void
+bmp_iter_and_compl_init (bitmap_iterator *bi, const_bitmap map1, const_bitmap map2,
+ unsigned start_bit, unsigned *bit_no)
+{
+ bi->elt1 = map1->first;
+ bi->elt2 = map2->first;
+
+ /* Advance elt1 until it is not before the block containing start_bit. */
+ while (1)
+ {
+ if (!bi->elt1)
+ {
+ bi->elt1 = &bitmap_zero_bits;
+ break;
+ }
+
+ if (bi->elt1->indx >= start_bit / BITMAP_ELEMENT_ALL_BITS)
+ break;
+ bi->elt1 = bi->elt1->next;
+ }
+
+ /* Advance elt2 until it is not before elt1. */
+ while (bi->elt2 && bi->elt2->indx < bi->elt1->indx)
+ bi->elt2 = bi->elt2->next;
+
+ /* We might have advanced beyond the start_bit, so reinitialize for
+ that. */
+ if (bi->elt1->indx != start_bit / BITMAP_ELEMENT_ALL_BITS)
+ start_bit = bi->elt1->indx * BITMAP_ELEMENT_ALL_BITS;
+
+ bi->word_no = start_bit / BITMAP_WORD_BITS % BITMAP_ELEMENT_WORDS;
+ bi->bits = bi->elt1->bits[bi->word_no];
+ if (bi->elt2 && bi->elt1->indx == bi->elt2->indx)
+ bi->bits &= ~bi->elt2->bits[bi->word_no];
+ bi->bits >>= start_bit % BITMAP_WORD_BITS;
+
+ /* If this word is zero, we must make sure we're not pointing at the
+ first bit, otherwise our incrementing to the next word boundary
+ will fail. It won't matter if this increment moves us into the
+ next word. */
+ start_bit += !bi->bits;
+
+ *bit_no = start_bit;
+}
+
+/* Advance to the next bit in BI. We don't advance to the next
+ nonzero bit yet. */
+
+static inline void
+bmp_iter_next (bitmap_iterator *bi, unsigned *bit_no)
+{
+ bi->bits >>= 1;
+ *bit_no += 1;
+}
+
+/* Advance to first set bit in BI. */
+
+static inline void
+bmp_iter_next_bit (bitmap_iterator * bi, unsigned *bit_no)
+{
+#if (GCC_VERSION >= 3004)
+ {
+ unsigned int n = __builtin_ctzl (bi->bits);
+ gcc_assert (sizeof (unsigned long) == sizeof (BITMAP_WORD));
+ bi->bits >>= n;
+ *bit_no += n;
+ }
+#else
+ while (!(bi->bits & 1))
+ {
+ bi->bits >>= 1;
+ *bit_no += 1;
+ }
+#endif
+}
+
+/* Advance to the next nonzero bit of a single bitmap, we will have
+ already advanced past the just iterated bit. Return true if there
+ is a bit to iterate. */
+
+static inline bool
+bmp_iter_set (bitmap_iterator *bi, unsigned *bit_no)
+{
+ /* If our current word is nonzero, it contains the bit we want. */
+ if (bi->bits)
+ {
+ next_bit:
+ bmp_iter_next_bit (bi, bit_no);
+ return true;
+ }
+
+ /* Round up to the word boundary. We might have just iterated past
+ the end of the last word, hence the -1. It is not possible for
+ bit_no to point at the beginning of the now last word. */
+ *bit_no = ((*bit_no + BITMAP_WORD_BITS - 1)
+ / BITMAP_WORD_BITS * BITMAP_WORD_BITS);
+ bi->word_no++;
+
+ while (1)
+ {
+ /* Find the next nonzero word in this elt. */
+ while (bi->word_no != BITMAP_ELEMENT_WORDS)
+ {
+ bi->bits = bi->elt1->bits[bi->word_no];
+ if (bi->bits)
+ goto next_bit;
+ *bit_no += BITMAP_WORD_BITS;
+ bi->word_no++;
+ }
+
+ /* Advance to the next element. */
+ bi->elt1 = bi->elt1->next;
+ if (!bi->elt1)
+ return false;
+ *bit_no = bi->elt1->indx * BITMAP_ELEMENT_ALL_BITS;
+ bi->word_no = 0;
+ }
+}
+
+/* Advance to the next nonzero bit of an intersecting pair of
+ bitmaps. We will have already advanced past the just iterated bit.
+ Return true if there is a bit to iterate. */
+
+static inline bool
+bmp_iter_and (bitmap_iterator *bi, unsigned *bit_no)
+{
+ /* If our current word is nonzero, it contains the bit we want. */
+ if (bi->bits)
+ {
+ next_bit:
+ bmp_iter_next_bit (bi, bit_no);
+ return true;
+ }
+
+ /* Round up to the word boundary. We might have just iterated past
+ the end of the last word, hence the -1. It is not possible for
+ bit_no to point at the beginning of the now last word. */
+ *bit_no = ((*bit_no + BITMAP_WORD_BITS - 1)
+ / BITMAP_WORD_BITS * BITMAP_WORD_BITS);
+ bi->word_no++;
+
+ while (1)
+ {
+ /* Find the next nonzero word in this elt. */
+ while (bi->word_no != BITMAP_ELEMENT_WORDS)
+ {
+ bi->bits = bi->elt1->bits[bi->word_no] & bi->elt2->bits[bi->word_no];
+ if (bi->bits)
+ goto next_bit;
+ *bit_no += BITMAP_WORD_BITS;
+ bi->word_no++;
+ }
+
+ /* Advance to the next identical element. */
+ do
+ {
+ /* Advance elt1 while it is less than elt2. We always want
+ to advance one elt. */
+ do
+ {
+ bi->elt1 = bi->elt1->next;
+ if (!bi->elt1)
+ return false;
+ }
+ while (bi->elt1->indx < bi->elt2->indx);
+
+ /* Advance elt2 to be no less than elt1. This might not
+ advance. */
+ while (bi->elt2->indx < bi->elt1->indx)
+ {
+ bi->elt2 = bi->elt2->next;
+ if (!bi->elt2)
+ return false;
+ }
+ }
+ while (bi->elt1->indx != bi->elt2->indx);
+
+ *bit_no = bi->elt1->indx * BITMAP_ELEMENT_ALL_BITS;
+ bi->word_no = 0;
+ }
+}
+
+/* Advance to the next nonzero bit in the intersection of
+ complemented bitmaps. We will have already advanced past the just
+ iterated bit. */
+
+static inline bool
+bmp_iter_and_compl (bitmap_iterator *bi, unsigned *bit_no)
+{
+ /* If our current word is nonzero, it contains the bit we want. */
+ if (bi->bits)
+ {
+ next_bit:
+ bmp_iter_next_bit (bi, bit_no);
+ return true;
+ }
+
+ /* Round up to the word boundary. We might have just iterated past
+ the end of the last word, hence the -1. It is not possible for
+ bit_no to point at the beginning of the now last word. */
+ *bit_no = ((*bit_no + BITMAP_WORD_BITS - 1)
+ / BITMAP_WORD_BITS * BITMAP_WORD_BITS);
+ bi->word_no++;
+
+ while (1)
+ {
+ /* Find the next nonzero word in this elt. */
+ while (bi->word_no != BITMAP_ELEMENT_WORDS)
+ {
+ bi->bits = bi->elt1->bits[bi->word_no];
+ if (bi->elt2 && bi->elt2->indx == bi->elt1->indx)
+ bi->bits &= ~bi->elt2->bits[bi->word_no];
+ if (bi->bits)
+ goto next_bit;
+ *bit_no += BITMAP_WORD_BITS;
+ bi->word_no++;
+ }
+
+ /* Advance to the next element of elt1. */
+ bi->elt1 = bi->elt1->next;
+ if (!bi->elt1)
+ return false;
+
+ /* Advance elt2 until it is no less than elt1. */
+ while (bi->elt2 && bi->elt2->indx < bi->elt1->indx)
+ bi->elt2 = bi->elt2->next;
+
+ *bit_no = bi->elt1->indx * BITMAP_ELEMENT_ALL_BITS;
+ bi->word_no = 0;
+ }
+}
+
+/* Loop over all bits set in BITMAP, starting with MIN and setting
+ BITNUM to the bit number. ITER is a bitmap iterator. BITNUM
+ should be treated as a read-only variable as it contains loop
+ state. */
+
+#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)))
+
+/* Loop over all the bits set in BITMAP1 & BITMAP2, starting with MIN
+ and setting BITNUM to the bit number. ITER is a bitmap iterator.
+ BITNUM should be treated as a read-only variable as it contains
+ loop state. */
+
+#define EXECUTE_IF_AND_IN_BITMAP(BITMAP1, BITMAP2, MIN, BITNUM, ITER) \
+ for (bmp_iter_and_init (&(ITER), (BITMAP1), (BITMAP2), (MIN), \
+ &(BITNUM)); \
+ bmp_iter_and (&(ITER), &(BITNUM)); \
+ bmp_iter_next (&(ITER), &(BITNUM)))
+
+/* Loop over all the bits set in BITMAP1 & ~BITMAP2, starting with MIN
+ and setting BITNUM to the bit number. ITER is a bitmap iterator.
+ BITNUM should be treated as a read-only variable as it contains
+ loop state. */
+
+#define EXECUTE_IF_AND_COMPL_IN_BITMAP(BITMAP1, BITMAP2, MIN, BITNUM, ITER) \
+ for (bmp_iter_and_compl_init (&(ITER), (BITMAP1), (BITMAP2), (MIN), \
+ &(BITNUM)); \
+ bmp_iter_and_compl (&(ITER), &(BITNUM)); \
+ bmp_iter_next (&(ITER), &(BITNUM)))
#endif /* GCC_BITMAP_H */
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