/* Functions to support general ended bitmaps.
- Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
+ Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
-This file is part of GNU CC.
+This file is part of GCC.
-GNU CC 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 version.
+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
+version.
-GNU CC 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.
+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 GNU CC; 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 COPYING. If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA. */
#include "config.h"
#include "system.h"
#include "rtl.h"
#include "flags.h"
#include "obstack.h"
-#include "regs.h"
-#include "basic-block.h"
+#include "ggc.h"
+#include "bitmap.h"
/* Obstack to allocate bitmap elements from. */
static struct obstack bitmap_obstack;
#endif
/* Global data */
-bitmap_element bitmap_zero; /* An element of all zero bits. */
-bitmap_element *bitmap_free; /* Freelist of bitmap elements. */
+bitmap_element bitmap_zero_bits; /* An element of all zero bits. */
+static bitmap_element *bitmap_free; /* Freelist of bitmap elements. */
+static GTY((deletable (""))) bitmap_element *bitmap_ggc_free;
+static void bitmap_elem_to_freelist PARAMS ((bitmap, bitmap_element *));
static void bitmap_element_free PARAMS ((bitmap, bitmap_element *));
-static bitmap_element *bitmap_element_allocate PARAMS ((void));
+static bitmap_element *bitmap_element_allocate PARAMS ((bitmap));
static int bitmap_element_zerop PARAMS ((bitmap_element *));
static void bitmap_element_link PARAMS ((bitmap, bitmap_element *));
static bitmap_element *bitmap_find_bit PARAMS ((bitmap, unsigned int));
\f
-/* Free a bitmap element */
+/* Add ELEM to the appropriate freelist. */
+static INLINE void
+bitmap_elem_to_freelist (head, elt)
+ bitmap head;
+ bitmap_element *elt;
+{
+ if (head->using_obstack)
+ {
+ elt->next = bitmap_free;
+ bitmap_free = elt;
+ }
+ else
+ {
+ elt->next = bitmap_ggc_free;
+ bitmap_ggc_free = elt;
+ }
+}
+
+/* Free a bitmap element. Since these are allocated off the
+ bitmap_obstack, "free" actually means "put onto the freelist". */
static INLINE void
bitmap_element_free (head, elt)
/* Since the first thing we try is to insert before current,
make current the next entry in preference to the previous. */
if (head->current == elt)
- head->current = next != 0 ? next : prev;
-
- elt->next = bitmap_free;
- bitmap_free = elt;
+ {
+ head->current = next != 0 ? next : prev;
+ if (head->current)
+ head->indx = head->current->indx;
+ }
+ bitmap_elem_to_freelist (head, elt);
}
\f
/* Allocate a bitmap element. The bits are cleared, but nothing else is. */
static INLINE bitmap_element *
-bitmap_element_allocate ()
+bitmap_element_allocate (head)
+ bitmap head;
{
bitmap_element *element;
-#if BITMAP_ELEMENT_WORDS != 2
- int i;
-#endif
- if (bitmap_free != 0)
- {
- element = bitmap_free;
- bitmap_free = element->next;
- }
- else
+ if (head->using_obstack)
{
- /* We can't use gcc_obstack_init to initialize the obstack since
- print-rtl.c now calls bitmap functions, and bitmap is linked
- into the gen* functions. */
- if (!bitmap_obstack_init)
+ if (bitmap_free != 0)
{
- bitmap_obstack_init = TRUE;
-
- /* Let particular systems override the size of a chunk. */
+ element = bitmap_free;
+ bitmap_free = element->next;
+ }
+ else
+ {
+ /* We can't use gcc_obstack_init to initialize the obstack since
+ print-rtl.c now calls bitmap functions, and bitmap is linked
+ into the gen* functions. */
+ if (!bitmap_obstack_init)
+ {
+ bitmap_obstack_init = TRUE;
+
+ /* Let particular systems override the size of a chunk. */
#ifndef OBSTACK_CHUNK_SIZE
#define OBSTACK_CHUNK_SIZE 0
#endif
- /* Let them override the alloc and free routines too. */
+ /* Let them override the alloc and free routines too. */
#ifndef OBSTACK_CHUNK_ALLOC
#define OBSTACK_CHUNK_ALLOC xmalloc
#endif
#ifndef OBSTACK_CHUNK_FREE
#define OBSTACK_CHUNK_FREE free
#endif
-
+
#if !defined(__GNUC__) || (__GNUC__ < 2)
#define __alignof__(type) 0
#endif
-
- obstack_specify_allocation (&bitmap_obstack, OBSTACK_CHUNK_SIZE,
- __alignof__ (bitmap_element),
- (void *(*) PARAMS ((long))) OBSTACK_CHUNK_ALLOC,
- (void (*) PARAMS ((void *))) OBSTACK_CHUNK_FREE);
+
+ obstack_specify_allocation (&bitmap_obstack, OBSTACK_CHUNK_SIZE,
+ __alignof__ (bitmap_element),
+ (void *(*) PARAMS ((long))) OBSTACK_CHUNK_ALLOC,
+ (void (*) PARAMS ((void *))) OBSTACK_CHUNK_FREE);
+ }
+
+ element = (bitmap_element *) obstack_alloc (&bitmap_obstack,
+ sizeof (bitmap_element));
}
-
- element = (bitmap_element *) obstack_alloc (&bitmap_obstack,
- sizeof (bitmap_element));
+ }
+ else
+ {
+ if (bitmap_ggc_free != NULL)
+ {
+ element = bitmap_ggc_free;
+ bitmap_ggc_free = element->next;
+ }
+ else
+ element = ggc_alloc (sizeof (bitmap_element));
}
-#if BITMAP_ELEMENT_WORDS == 2
- element->bits[0] = element->bits[1] = 0;
-#else
- for (i = 0; i < BITMAP_ELEMENT_WORDS; i++)
- element->bits[i] = 0;
-#endif
+ memset (element->bits, 0, sizeof (element->bits));
return element;
}
+/* Release any memory allocated by bitmaps. */
+
+void
+bitmap_release_memory ()
+{
+ bitmap_free = 0;
+ if (bitmap_obstack_init)
+ {
+ bitmap_obstack_init = FALSE;
+ obstack_free (&bitmap_obstack, NULL);
+ }
+}
+
/* Return nonzero if all bits in an element are zero. */
static INLINE int
for (element = head->first; element != 0; element = next)
{
next = element->next;
- element->next = bitmap_free;
- bitmap_free = element;
+ bitmap_elem_to_freelist (head, element);
}
- head->first = head->current = 0;
+ head->first = head->current = 0;
}
\f
-/* Copy a bitmap to another bitmap */
+/* Copy a bitmap to another bitmap. */
void
bitmap_copy (to, from)
/* Copy elements in forward direction one at a time */
for (from_ptr = from->first; from_ptr; from_ptr = from_ptr->next)
{
- bitmap_element *to_elt = bitmap_element_allocate ();
+ bitmap_element *to_elt = bitmap_element_allocate (to);
to_elt->indx = from_ptr->indx;
bitmap_element *element;
unsigned HOST_WIDE_INT indx = bit / BITMAP_ELEMENT_ALL_BITS;
- if (head->current == 0)
- return 0;
+ if (head->current == 0
+ || head->indx == indx)
+ return head->current;
if (head->indx > indx)
for (element = head->current;
}
}
-\f
/* Set a single bit in a bitmap. */
void
if (ptr == 0)
{
- ptr = bitmap_element_allocate ();
+ ptr = bitmap_element_allocate (head);
ptr->indx = bit / BITMAP_ELEMENT_ALL_BITS;
ptr->bits[word_num] = bit_val;
bitmap_element_link (head, ptr);
else
ptr->bits[word_num] |= bit_val;
}
-\f
+
/* Return whether a bit is set within a bitmap. */
int
return (ptr->bits[word_num] >> bit_num) & 1;
}
\f
+/* Return the bit number of the first set bit in the bitmap, or -1
+ if the bitmap is empty. */
+
+int
+bitmap_first_set_bit (a)
+ bitmap a;
+{
+ bitmap_element *ptr = a->first;
+ unsigned HOST_WIDE_INT word;
+ unsigned word_num, bit_num;
+
+ if (ptr == NULL)
+ return -1;
+
+#if BITMAP_ELEMENT_WORDS == 2
+ word_num = 0, word = ptr->bits[0];
+ if (word == 0)
+ word_num = 1, word = ptr->bits[1];
+#else
+ for (word_num = 0; word_num < BITMAP_ELEMENT_WORDS; ++word_num)
+ if ((word = ptr->bits[word_num]) != 0)
+ break;
+#endif
+
+ /* Binary search for the first set bit. */
+ /* ??? It'd be nice to know if ffs or ffsl was available. */
+
+ bit_num = 0;
+ word = word & -word;
+
+#if HOST_BITS_PER_WIDE_INT > 64
+ #error "Fill out the table."
+#endif
+#if HOST_BITS_PER_WIDE_INT > 32
+ if ((word & 0xffffffff) == 0)
+ word >>= 32, bit_num += 32;
+#endif
+ if ((word & 0xffff) == 0)
+ word >>= 16, bit_num += 16;
+ if ((word & 0xff) == 0)
+ word >>= 8, bit_num += 8;
+ if (word & 0xf0)
+ bit_num += 4;
+ if (word & 0xcc)
+ bit_num += 2;
+ if (word & 0xaa)
+ bit_num += 1;
+
+ return (ptr->indx * BITMAP_ELEMENT_ALL_BITS
+ + word_num * HOST_BITS_PER_WIDE_INT
+ + bit_num);
+}
+
+/* Return the bit number of the last set bit in the bitmap, or -1
+ if the bitmap is empty. */
+
+int
+bitmap_last_set_bit (a)
+ bitmap a;
+{
+ bitmap_element *ptr = a->first;
+ unsigned HOST_WIDE_INT word;
+ unsigned word_num, bit_num;
+
+ if (ptr == NULL)
+ return -1;
+
+ while (ptr->next != NULL)
+ ptr = ptr->next;
+
+#if BITMAP_ELEMENT_WORDS == 2
+ word_num = 1, word = ptr->bits[1];
+ if (word == 0)
+ word_num = 0, word = ptr->bits[0];
+#else
+ for (word_num = BITMAP_ELEMENT_WORDS; word_num-- > 0; )
+ if ((word = ptr->bits[word_num]) != 0)
+ break;
+#endif
+
+ /* Binary search for the last set bit. */
+
+ bit_num = 0;
+#if HOST_BITS_PER_WIDE_INT > 64
+ #error "Fill out the table."
+#endif
+#if HOST_BITS_PER_WIDE_INT > 32
+ if (word & ~ (unsigned HOST_WIDE_INT) 0xffffffff)
+ word >>= 32, bit_num += 32;
+#endif
+ if (word & 0xffff0000)
+ word >>= 16, bit_num += 16;
+ if (word & 0xff00)
+ word >>= 8, bit_num += 8;
+ if (word & 0xf0)
+ word >>= 4, bit_num += 4;
+ if (word & 0xc)
+ word >>= 2, bit_num += 2;
+ if (word & 0x2)
+ bit_num += 1;
+
+ return (ptr->indx * BITMAP_ELEMENT_ALL_BITS
+ + word_num * HOST_BITS_PER_WIDE_INT
+ + bit_num);
+}
+\f
/* Store in bitmap TO the result of combining bitmap FROM1 and FROM2 using
a specific bit manipulation. Return true if TO changes. */
bitmap from2;
enum bitmap_bits operation;
{
+#define HIGHEST_INDEX (unsigned int) ~0
+
bitmap_element *from1_ptr = from1->first;
bitmap_element *from2_ptr = from2->first;
- unsigned int indx1 = (from1_ptr) ? from1_ptr->indx : -1;
- unsigned int indx2 = (from2_ptr) ? from2_ptr->indx : -1;
+ unsigned int indx1 = (from1_ptr) ? from1_ptr->indx : HIGHEST_INDEX;
+ unsigned int indx2 = (from2_ptr) ? from2_ptr->indx : HIGHEST_INDEX;
bitmap_element *to_ptr = to->first;
bitmap_element *from1_tmp;
bitmap_element *from2_tmp;
from1_tmp = from1_ptr;
from2_tmp = from2_ptr;
from1_ptr = from1_ptr->next;
- indx1 = (from1_ptr) ? from1_ptr->indx : -1;
+ indx1 = (from1_ptr) ? from1_ptr->indx : HIGHEST_INDEX;
from2_ptr = from2_ptr->next;
- indx2 = (from2_ptr) ? from2_ptr->indx : -1;
+ indx2 = (from2_ptr) ? from2_ptr->indx : HIGHEST_INDEX;
}
else if (indx1 < indx2)
{
indx = indx1;
from1_tmp = from1_ptr;
- from2_tmp = &bitmap_zero;
+ from2_tmp = &bitmap_zero_bits;
from1_ptr = from1_ptr->next;
- indx1 = (from1_ptr) ? from1_ptr->indx : -1;
+ indx1 = (from1_ptr) ? from1_ptr->indx : HIGHEST_INDEX;
}
else
{
indx = indx2;
- from1_tmp = &bitmap_zero;
+ from1_tmp = &bitmap_zero_bits;
from2_tmp = from2_ptr;
from2_ptr = from2_ptr->next;
- indx2 = (from2_ptr) ? from2_ptr->indx : -1;
+ indx2 = (from2_ptr) ? from2_ptr->indx : HIGHEST_INDEX;
}
/* Find the appropriate element from TO. Begin by discarding
- elements that we've skipped. */
+ elements that we've skipped. */
while (to_ptr && to_ptr->indx < indx)
{
changed = 1;
to_tmp = to_ptr;
to_ptr = to_ptr->next;
- to_tmp = bitmap_free;
- bitmap_free = to_tmp;
+ bitmap_elem_to_freelist (to, to_tmp);
}
if (to_ptr && to_ptr->indx == indx)
{
to_ptr = to_ptr->next;
}
else
- to_tmp = bitmap_element_allocate ();
+ to_tmp = bitmap_element_allocate (to);
/* Do the operation, and if any bits are set, link it into the
linked list. */
case BITMAP_IOR:
DOIT (|);
break;
-
+ case BITMAP_IOR_COMPL:
+ DOIT (|~);
+ break;
case BITMAP_XOR:
DOIT (^);
break;
to_tmp->indx = indx;
bitmap_element_link (to, to_tmp);
}
+ else
+ {
+ bitmap_elem_to_freelist (to, to_tmp);
+ }
}
/* If we have elements of TO left over, free the lot. */
changed = 1;
for (to_tmp = to_ptr; to_tmp->next ; to_tmp = to_tmp->next)
continue;
- to_tmp->next = bitmap_free;
- bitmap_free = to_ptr;
+ if (to->using_obstack)
+ {
+ to_tmp->next = bitmap_free;
+ bitmap_free = to_ptr;
+ }
+ else
+ {
+ to_tmp->next = bitmap_ggc_free;
+ bitmap_ggc_free = to_ptr;
+ }
}
#undef DOIT
}
\f
/* Or into bitmap TO bitmap FROM1 and'ed with the complement of
- bitmap FROM2. */
+ bitmap FROM2. */
void
bitmap_ior_and_compl (to, from1, from2)
bitmap_operation (to, to, &tmp, BITMAP_IOR);
bitmap_clear (&tmp);
}
+
+int
+bitmap_union_of_diff (dst, a, b, c)
+ bitmap dst;
+ bitmap a;
+ bitmap b;
+ bitmap c;
+{
+ bitmap_head tmp;
+ int changed;
+
+ tmp.first = tmp.current = 0;
+
+ bitmap_operation (&tmp, b, c, BITMAP_AND_COMPL);
+ changed = bitmap_operation (dst, &tmp, a, BITMAP_IOR);
+ bitmap_clear (&tmp);
+
+ return changed;
+}
\f
/* Initialize a bitmap header. */
bitmap
-bitmap_initialize (head)
+bitmap_initialize (head, using_obstack)
bitmap head;
+ int using_obstack;
{
+ if (head == NULL && ! using_obstack)
+ head = ggc_alloc (sizeof (*head));
+
head->first = head->current = 0;
+ head->using_obstack = using_obstack;
return head;
}
bitmap_element *ptr;
fprintf (file, "\nfirst = ");
- fprintf (file, HOST_PTR_PRINTF, head->first);
+ fprintf (file, HOST_PTR_PRINTF, (PTR) head->first);
fprintf (file, " current = ");
- fprintf (file, HOST_PTR_PRINTF, head->current);
+ fprintf (file, HOST_PTR_PRINTF, (PTR) head->current);
fprintf (file, " indx = %u\n", head->indx);
for (ptr = head->first; ptr; ptr = ptr->next)
int i, j, col = 26;
fprintf (file, "\t");
- fprintf (file, HOST_PTR_PRINTF, ptr);
+ fprintf (file, HOST_PTR_PRINTF, (PTR) ptr);
fprintf (file, " next = ");
- fprintf (file, HOST_PTR_PRINTF, ptr->next);
+ fprintf (file, HOST_PTR_PRINTF, (PTR) ptr->next);
fprintf (file, " prev = ");
- fprintf (file, HOST_PTR_PRINTF, ptr->prev);
+ fprintf (file, HOST_PTR_PRINTF, (PTR) ptr->prev);
fprintf (file, " indx = %u\n\t\tbits = {", ptr->indx);
for (i = 0; i < BITMAP_ELEMENT_WORDS; i++)
fprintf (file, " }\n");
}
}
-\f
+
/* Function to be called from the debugger to print the contents
of a bitmap. */
{
debug_bitmap_file (stdout, head);
}
-\f
+
/* Function to print out the contents of a bitmap. Unlike debug_bitmap_file,
it does not print anything but the bits. */
});
fputs (suffix, file);
}
-\f
-/* Release any memory allocated by bitmaps. */
-void
-bitmap_release_memory ()
-{
- bitmap_free = 0;
- if (bitmap_obstack_init)
- {
- bitmap_obstack_init = FALSE;
- obstack_free (&bitmap_obstack, NULL_PTR);
- }
-}
+#include "gt-bitmap.h"
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