X-Git-Url: http://git.sourceforge.jp/view?p=pf3gnuchains%2Fgcc-fork.git;a=blobdiff_plain;f=gcc%2Fbitmap.c;h=8d7f1b2aa9536e52528449f0211c08fc84b75f1d;hp=4e448ac58865a5aee7eda79f1f96fb0c2d4d661d;hb=3550cdc15f67928728dace2862aa0312301ba7a8;hpb=01ce7a1b4676cbabb411defe964313048ee6c8fd diff --git a/gcc/bitmap.c b/gcc/bitmap.c index 4e448ac5886..8d7f1b2aa95 100644 --- a/gcc/bitmap.c +++ b/gcc/bitmap.c @@ -1,59 +1,162 @@ /* Functions to support general ended bitmaps. - Copyright (C) 1997, 1998 Free Software Foundation, Inc. + Copyright (C) 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, + 2006, 2007, 2008, 2009, 2010 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 3, 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 COPYING3. If not see +. */ #include "config.h" #include "system.h" -#include "rtl.h" -#include "flags.h" +#include "coretypes.h" #include "obstack.h" -#include "regs.h" -#include "basic-block.h" +#include "ggc.h" +#include "bitmap.h" +#include "hashtab.h" -/* Obstack to allocate bitmap elements from. */ -static struct obstack bitmap_obstack; -static int bitmap_obstack_init = FALSE; - -#ifndef INLINE -#ifndef __GNUC__ -#define INLINE -#else -#define INLINE __inline__ -#endif +#ifdef GATHER_STATISTICS + +/* Store information about each particular bitmap. */ +struct bitmap_descriptor +{ + const char *function; + const char *file; + int line; + int created; + HOST_WIDEST_INT allocated; + HOST_WIDEST_INT peak; + HOST_WIDEST_INT current; + int nsearches; + int search_iter; +}; + +/* Hashtable mapping bitmap names to descriptors. */ +static htab_t bitmap_desc_hash; + +/* Hashtable helpers. */ +static hashval_t +hash_descriptor (const void *p) +{ + const struct bitmap_descriptor *const d = + (const struct bitmap_descriptor *) p; + return htab_hash_pointer (d->file) + d->line; +} +struct loc +{ + const char *file; + const char *function; + int line; +}; +static int +eq_descriptor (const void *p1, const void *p2) +{ + const struct bitmap_descriptor *const d = + (const struct bitmap_descriptor *) p1; + const struct loc *const l = (const struct loc *) p2; + return d->file == l->file && d->function == l->function && d->line == l->line; +} + +/* For given file and line, return descriptor, create new if needed. */ +static struct bitmap_descriptor * +bitmap_descriptor (const char *file, const char *function, int line) +{ + struct bitmap_descriptor **slot; + struct loc loc; + + loc.file = file; + loc.function = function; + loc.line = line; + + if (!bitmap_desc_hash) + bitmap_desc_hash = htab_create (10, hash_descriptor, eq_descriptor, NULL); + + slot = (struct bitmap_descriptor **) + htab_find_slot_with_hash (bitmap_desc_hash, &loc, + htab_hash_pointer (file) + line, + INSERT); + if (*slot) + return *slot; + *slot = XCNEW (struct bitmap_descriptor); + (*slot)->file = file; + (*slot)->function = function; + (*slot)->line = line; + return *slot; +} + +/* Register new bitmap. */ +void +bitmap_register (bitmap b MEM_STAT_DECL) +{ + b->desc = bitmap_descriptor (_loc_name, _loc_function, _loc_line); + b->desc->created++; +} + +/* Account the overhead. */ +static void +register_overhead (bitmap b, int amount) +{ + b->desc->current += amount; + if (amount > 0) + b->desc->allocated += amount; + gcc_assert (b->desc->current >= 0); + if (b->desc->peak < b->desc->current) + b->desc->peak = b->desc->current; +} #endif /* Global data */ -bitmap_element bitmap_zero; /* An element of all zero bits. */ -bitmap_element *bitmap_free; /* Freelist of bitmap elements. */ - -static void bitmap_element_free PROTO((bitmap, bitmap_element *)); -static bitmap_element *bitmap_element_allocate PROTO((void)); -static int bitmap_element_zerop PROTO((bitmap_element *)); -static void bitmap_element_link PROTO((bitmap, bitmap_element *)); -static bitmap_element *bitmap_find_bit PROTO((bitmap, unsigned int)); +bitmap_element bitmap_zero_bits; /* An element of all zero bits. */ +bitmap_obstack bitmap_default_obstack; /* The default bitmap obstack. */ +static int bitmap_default_obstack_depth; +static GTY((deletable)) bitmap_element *bitmap_ggc_free; /* Freelist of + GC'd elements. */ + +static void bitmap_elem_to_freelist (bitmap, bitmap_element *); +static void bitmap_element_free (bitmap, bitmap_element *); +static bitmap_element *bitmap_element_allocate (bitmap); +static int bitmap_element_zerop (const bitmap_element *); +static void bitmap_element_link (bitmap, bitmap_element *); +static bitmap_element *bitmap_elt_insert_after (bitmap, bitmap_element *, unsigned int); +static void bitmap_elt_clear_from (bitmap, bitmap_element *); +static bitmap_element *bitmap_find_bit (bitmap, unsigned int); -/* Free a bitmap element */ -static INLINE void -bitmap_element_free (head, elt) - bitmap head; - bitmap_element *elt; +/* Add ELEM to the appropriate freelist. */ +static inline void +bitmap_elem_to_freelist (bitmap head, bitmap_element *elt) +{ + bitmap_obstack *bit_obstack = head->obstack; + + elt->next = NULL; + if (bit_obstack) + { + elt->prev = bit_obstack->elements; + bit_obstack->elements = elt; + } + else + { + elt->prev = 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 (bitmap head, bitmap_element *elt) { bitmap_element *next = elt->next; bitmap_element *prev = elt->prev; @@ -70,82 +173,240 @@ 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; + else + head->indx = 0; + } +#ifdef GATHER_STATISTICS + register_overhead (head, -((int)sizeof (bitmap_element))); +#endif + bitmap_elem_to_freelist (head, elt); } /* Allocate a bitmap element. The bits are cleared, but nothing else is. */ -static INLINE bitmap_element * -bitmap_element_allocate () +static inline bitmap_element * +bitmap_element_allocate (bitmap head) { bitmap_element *element; -#if BITMAP_ELEMENT_WORDS != 2 - int i; -#endif + bitmap_obstack *bit_obstack = head->obstack; - if (bitmap_free != 0) + if (bit_obstack) { - element = bitmap_free; - bitmap_free = element->next; + element = bit_obstack->elements; + + if (element) + /* Use up the inner list first before looking at the next + element of the outer list. */ + if (element->next) + { + bit_obstack->elements = element->next; + bit_obstack->elements->prev = element->prev; + } + else + /* Inner list was just a singleton. */ + bit_obstack->elements = element->prev; + else + element = XOBNEW (&bit_obstack->obstack, bitmap_element); } 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; + element = bitmap_ggc_free; + if (element) + /* Use up the inner list first before looking at the next + element of the outer list. */ + if (element->next) + { + bitmap_ggc_free = element->next; + bitmap_ggc_free->prev = element->prev; + } + else + /* Inner list was just a singleton. */ + bitmap_ggc_free = element->prev; + else + element = ggc_alloc_bitmap_element_def (); + } - /* Let particular systems override the size of a chunk. */ -#ifndef OBSTACK_CHUNK_SIZE -#define OBSTACK_CHUNK_SIZE 0 +#ifdef GATHER_STATISTICS + register_overhead (head, sizeof (bitmap_element)); #endif - /* Let them override the alloc and free routines too. */ -#ifndef OBSTACK_CHUNK_ALLOC -#define OBSTACK_CHUNK_ALLOC xmalloc + memset (element->bits, 0, sizeof (element->bits)); + + return element; +} + +/* Remove ELT and all following elements from bitmap HEAD. */ + +void +bitmap_elt_clear_from (bitmap head, bitmap_element *elt) +{ + bitmap_element *prev; + bitmap_obstack *bit_obstack = head->obstack; +#ifdef GATHER_STATISTICS + int n; #endif -#ifndef OBSTACK_CHUNK_FREE -#define OBSTACK_CHUNK_FREE free + + if (!elt) return; +#ifdef GATHER_STATISTICS + n = 0; + for (prev = elt; prev; prev = prev->next) + n++; + register_overhead (head, -sizeof (bitmap_element) * n); #endif + prev = elt->prev; + if (prev) + { + prev->next = NULL; + if (head->current->indx > prev->indx) + { + head->current = prev; + head->indx = prev->indx; + } + } + else + { + head->first = NULL; + head->current = NULL; + head->indx = 0; + } + + /* Put the entire list onto the free list in one operation. */ + if (bit_obstack) + { + elt->prev = bit_obstack->elements; + bit_obstack->elements = elt; + } + else + { + elt->prev = bitmap_ggc_free; + bitmap_ggc_free = elt; + } +} + +/* Clear a bitmap by freeing the linked list. */ + +void +bitmap_clear (bitmap head) +{ + if (head->first) + bitmap_elt_clear_from (head, head->first); +} + +/* Initialize a bitmap obstack. If BIT_OBSTACK is NULL, initialize + the default bitmap obstack. */ + +void +bitmap_obstack_initialize (bitmap_obstack *bit_obstack) +{ + if (!bit_obstack) + { + if (bitmap_default_obstack_depth++) + return; + bit_obstack = &bitmap_default_obstack; + } + #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); - } + bit_obstack->elements = NULL; + bit_obstack->heads = NULL; + obstack_specify_allocation (&bit_obstack->obstack, OBSTACK_CHUNK_SIZE, + __alignof__ (bitmap_element), + obstack_chunk_alloc, + obstack_chunk_free); +} - element = (bitmap_element *) obstack_alloc (&bitmap_obstack, - sizeof (bitmap_element)); +/* Release the memory from a bitmap obstack. If BIT_OBSTACK is NULL, + release the default bitmap obstack. */ + +void +bitmap_obstack_release (bitmap_obstack *bit_obstack) +{ + if (!bit_obstack) + { + if (--bitmap_default_obstack_depth) + { + gcc_assert (bitmap_default_obstack_depth > 0); + return; + } + bit_obstack = &bitmap_default_obstack; } -#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; + bit_obstack->elements = NULL; + bit_obstack->heads = NULL; + obstack_free (&bit_obstack->obstack, NULL); +} + +/* Create a new bitmap on an obstack. If BIT_OBSTACK is NULL, create + it on the default bitmap obstack. */ + +bitmap +bitmap_obstack_alloc_stat (bitmap_obstack *bit_obstack MEM_STAT_DECL) +{ + bitmap map; + + if (!bit_obstack) + bit_obstack = &bitmap_default_obstack; + map = bit_obstack->heads; + if (map) + bit_obstack->heads = (struct bitmap_head_def *) map->first; + else + map = XOBNEW (&bit_obstack->obstack, bitmap_head); + bitmap_initialize_stat (map, bit_obstack PASS_MEM_STAT); +#ifdef GATHER_STATISTICS + register_overhead (map, sizeof (bitmap_head)); #endif - return element; + return map; +} + +/* Create a new GCd bitmap. */ + +bitmap +bitmap_gc_alloc_stat (ALONE_MEM_STAT_DECL) +{ + bitmap map; + + map = ggc_alloc_bitmap_head_def (); + bitmap_initialize_stat (map, NULL PASS_MEM_STAT); +#ifdef GATHER_STATISTICS + register_overhead (map, sizeof (bitmap_head)); +#endif + + return map; +} + +/* Release an obstack allocated bitmap. */ + +void +bitmap_obstack_free (bitmap map) +{ + if (map) + { + bitmap_clear (map); + map->first = (bitmap_element *) map->obstack->heads; +#ifdef GATHER_STATISTICS + register_overhead (map, -((int)sizeof (bitmap_head))); +#endif + map->obstack->heads = map; + } } + /* Return nonzero if all bits in an element are zero. */ -static INLINE int -bitmap_element_zerop (element) - bitmap_element *element; +static inline int +bitmap_element_zerop (const bitmap_element *element) { #if BITMAP_ELEMENT_WORDS == 2 return (element->bits[0] | element->bits[1]) == 0; #else - int i; + unsigned i; for (i = 0; i < BITMAP_ELEMENT_WORDS; i++) if (element->bits[i] != 0) @@ -157,10 +418,8 @@ bitmap_element_zerop (element) /* Link the bitmap element into the current bitmap linked list. */ -static INLINE void -bitmap_element_link (head, element) - bitmap head; - bitmap_element *element; +static inline void +bitmap_element_link (bitmap head, bitmap_element *element) { unsigned int indx = element->indx; bitmap_element *ptr; @@ -211,53 +470,59 @@ bitmap_element_link (head, element) head->current = element; head->indx = indx; } - -/* Clear a bitmap by freeing the linked list. */ -INLINE void -bitmap_clear (head) - bitmap head; +/* Insert a new uninitialized element into bitmap HEAD after element + ELT. If ELT is NULL, insert the element at the start. Return the + new element. */ + +static bitmap_element * +bitmap_elt_insert_after (bitmap head, bitmap_element *elt, unsigned int indx) { - bitmap_element *element, *next; + bitmap_element *node = bitmap_element_allocate (head); + node->indx = indx; - for (element = head->first; element != 0; element = next) + if (!elt) { - next = element->next; - element->next = bitmap_free; - bitmap_free = element; + if (!head->current) + { + head->current = node; + head->indx = indx; + } + node->next = head->first; + if (node->next) + node->next->prev = node; + head->first = node; + node->prev = NULL; } - - head->first = head->current = 0; + else + { + gcc_checking_assert (head->current); + node->next = elt->next; + if (node->next) + node->next->prev = node; + elt->next = node; + node->prev = elt; + } + return node; } -/* Copy a bitmap to another bitmap */ +/* Copy a bitmap to another bitmap. */ void -bitmap_copy (to, from) - bitmap to; - bitmap from; +bitmap_copy (bitmap to, const_bitmap from) { - bitmap_element *from_ptr, *to_ptr = 0; -#if BITMAP_ELEMENT_WORDS != 2 - int i; -#endif + const bitmap_element *from_ptr; + bitmap_element *to_ptr = 0; bitmap_clear (to); - /* Copy elements in forward direction one at a time */ + /* 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; - -#if BITMAP_ELEMENT_WORDS == 2 - to_elt->bits[0] = from_ptr->bits[0]; - to_elt->bits[1] = from_ptr->bits[1]; -#else - for (i = 0; i < BITMAP_ELEMENT_WORDS; i++) - to_elt->bits[i] = from_ptr->bits[i]; -#endif + memcpy (to_elt->bits, from_ptr->bits, sizeof (to_elt->bits)); /* Here we have a special case of bitmap_element_link, for the case where we know the links are being entered in sequence. */ @@ -283,28 +548,54 @@ bitmap_copy (to, from) would hold the bitmap's bit to make eventual allocation faster. */ -static INLINE bitmap_element * -bitmap_find_bit (head, bit) - bitmap head; - unsigned int bit; +static inline bitmap_element * +bitmap_find_bit (bitmap head, unsigned int bit) { bitmap_element *element; - unsigned HOST_WIDE_INT indx = bit / BITMAP_ELEMENT_ALL_BITS; + unsigned int indx = bit / BITMAP_ELEMENT_ALL_BITS; - if (head->current == 0) - return 0; + if (head->current == 0 + || head->indx == indx) + return head->current; +#ifdef GATHER_STATISTICS + head->desc->nsearches++; +#endif + + if (head->indx < indx) + /* INDX is beyond head->indx. Search from head->current + forward. */ + for (element = head->current; + element->next != 0 && element->indx < indx; + element = element->next) +#ifdef GATHER_STATISTICS + head->desc->search_iter++; +#else + ; +#endif - if (head->indx > indx) + else if (head->indx / 2 < indx) + /* INDX is less than head->indx and closer to head->indx than to + 0. Search from head->current backward. */ for (element = head->current; element->prev != 0 && element->indx > indx; element = element->prev) +#ifdef GATHER_STATISTICS + head->desc->search_iter++; +#else ; +#endif else - for (element = head->current; + /* INDX is less than head->indx and closer to 0 than to + head->indx. Search from head->first forward. */ + for (element = head->first; element->next != 0 && element->indx < indx; element = element->next) +#ifdef GATHER_STATISTICS + head->desc->search_iter++; +#else ; +#endif /* `element' is the nearest to the one we want. If it's not the one we want, the one we want doesn't exist. */ @@ -316,59 +607,65 @@ bitmap_find_bit (head, bit) return element; } -/* Clear a single bit in a bitmap. */ +/* Clear a single bit in a bitmap. Return true if the bit changed. */ -void -bitmap_clear_bit (head, bit) - bitmap head; - int bit; +bool +bitmap_clear_bit (bitmap head, int bit) { - bitmap_element *ptr = bitmap_find_bit (head, bit); + bitmap_element *const ptr = bitmap_find_bit (head, bit); if (ptr != 0) { - unsigned bit_num = bit % (unsigned) HOST_BITS_PER_WIDE_INT; - unsigned word_num = ((bit / (unsigned) HOST_BITS_PER_WIDE_INT) - % BITMAP_ELEMENT_WORDS); - ptr->bits[word_num] &= ~ (((unsigned HOST_WIDE_INT) 1) << bit_num); + unsigned bit_num = bit % BITMAP_WORD_BITS; + unsigned word_num = bit / BITMAP_WORD_BITS % BITMAP_ELEMENT_WORDS; + BITMAP_WORD bit_val = ((BITMAP_WORD) 1) << bit_num; + bool res = (ptr->bits[word_num] & bit_val) != 0; + if (res) + { + ptr->bits[word_num] &= ~bit_val; + /* If we cleared the entire word, free up the element. */ + if (!ptr->bits[word_num] + && bitmap_element_zerop (ptr)) + bitmap_element_free (head, ptr); + } - /* If we cleared the entire word, free up the element */ - if (bitmap_element_zerop (ptr)) - bitmap_element_free (head, ptr); + return res; } + + return false; } - -/* Set a single bit in a bitmap. */ +/* Set a single bit in a bitmap. Return true if the bit changed. */ -void -bitmap_set_bit (head, bit) - bitmap head; - int bit; +bool +bitmap_set_bit (bitmap head, int bit) { bitmap_element *ptr = bitmap_find_bit (head, bit); - unsigned word_num - = ((bit / (unsigned) HOST_BITS_PER_WIDE_INT) % BITMAP_ELEMENT_WORDS); - unsigned bit_num = bit % (unsigned) HOST_BITS_PER_WIDE_INT; - unsigned HOST_WIDE_INT bit_val = ((unsigned HOST_WIDE_INT) 1) << bit_num; + unsigned word_num = bit / BITMAP_WORD_BITS % BITMAP_ELEMENT_WORDS; + unsigned bit_num = bit % BITMAP_WORD_BITS; + BITMAP_WORD bit_val = ((BITMAP_WORD) 1) << bit_num; 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); + return true; } else - ptr->bits[word_num] |= bit_val; + { + bool res = (ptr->bits[word_num] & bit_val) == 0; + if (res) + ptr->bits[word_num] |= bit_val; + return res; + } } - + /* Return whether a bit is set within a bitmap. */ int -bitmap_bit_p (head, bit) - bitmap head; - int bit; +bitmap_bit_p (bitmap head, int bit) { bitmap_element *ptr; unsigned bit_num; @@ -378,264 +675,1506 @@ bitmap_bit_p (head, bit) if (ptr == 0) return 0; - bit_num = bit % (unsigned) HOST_BITS_PER_WIDE_INT; - word_num - = ((bit / (unsigned) HOST_BITS_PER_WIDE_INT) % BITMAP_ELEMENT_WORDS); + bit_num = bit % BITMAP_WORD_BITS; + word_num = bit / BITMAP_WORD_BITS % BITMAP_ELEMENT_WORDS; - return - (ptr->bits[word_num] & (((unsigned HOST_WIDE_INT) 1) << bit_num)) != 0; + return (ptr->bits[word_num] >> bit_num) & 1; } -/* Store in bitmap TO the result of combining bitmap FROM1 and - FROM2 using a specific bit manipulation. */ +#if GCC_VERSION < 3400 +/* Table of number of set bits in a character, indexed by value of char. */ +static const unsigned char popcount_table[] = +{ + 0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, + 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, + 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, + 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, + 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, + 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, + 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, + 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8, +}; + +static unsigned long +bitmap_popcount (BITMAP_WORD a) +{ + unsigned long ret = 0; + unsigned i; -void -bitmap_operation (to, from1, from2, operation) - bitmap to; - bitmap from1; - bitmap from2; - enum bitmap_bits operation; -{ - bitmap_element *delete_list = 0; - bitmap_element *from1_ptr = from1->first; - bitmap_element *from2_ptr = from2->first; - unsigned int indx1 - = (from1_ptr) ? from1_ptr->indx : ~ (unsigned HOST_WIDE_INT) 0; - unsigned int indx2 - = (from2_ptr) ? from2_ptr->indx : ~ (unsigned HOST_WIDE_INT) 0; - bitmap_element *to_ptr = 0; - bitmap_element *from1_tmp; - bitmap_element *from2_tmp; - unsigned int indx; -#if BITMAP_ELEMENT_WORDS != 2 - int i; + /* Just do this the table way for now */ + for (i = 0; i < BITMAP_WORD_BITS; i+= 8) + ret += popcount_table[(a >> i) & 0xff]; + return ret; +} #endif +/* Count the number of bits set in the bitmap, and return it. */ - /* To simplify things, always create a new list. If the old list was one - of the inputs, free it later. Otherwise, free it now. */ - if (to == from1 || to == from2) - { - delete_list = to->first; - to->first = to->current = 0; - } - else - bitmap_clear (to); +unsigned long +bitmap_count_bits (const_bitmap a) +{ + unsigned long count = 0; + const bitmap_element *elt; + unsigned ix; - while (from1_ptr != 0 || from2_ptr != 0) + for (elt = a->first; elt; elt = elt->next) { - /* Figure out whether we need to substitute zero elements for - missing links. */ - if (indx1 == indx2) - { - indx = indx1; - from1_tmp = from1_ptr; - from2_tmp = from2_ptr; - from1_ptr = from1_ptr->next; - indx1 = (from1_ptr) ? from1_ptr->indx : ~ (unsigned HOST_WIDE_INT) 0; - from2_ptr = from2_ptr->next; - indx2 = (from2_ptr) ? from2_ptr->indx : ~ (unsigned HOST_WIDE_INT) 0; - } - else if (indx1 < indx2) + for (ix = 0; ix != BITMAP_ELEMENT_WORDS; ix++) { - indx = indx1; - from1_tmp = from1_ptr; - from2_tmp = &bitmap_zero; - from1_ptr = from1_ptr->next; - indx1 = (from1_ptr) ? from1_ptr->indx : ~ (unsigned HOST_WIDE_INT) 0; - } - else - { - indx = indx2; - from1_tmp = &bitmap_zero; - from2_tmp = from2_ptr; - from2_ptr = from2_ptr->next; - indx2 = (from2_ptr) ? from2_ptr->indx : ~ (unsigned HOST_WIDE_INT) 0; +#if GCC_VERSION >= 3400 + /* Note that popcountl matches BITMAP_WORD in type, so the actual size + of BITMAP_WORD is not material. */ + count += __builtin_popcountl (elt->bits[ix]); +#else + count += bitmap_popcount (elt->bits[ix]); +#endif } + } + return count; +} - if (to_ptr == 0) - to_ptr = bitmap_element_allocate (); +/* Return true if the bitmap has a single bit set. Otherwise return + false. */ - /* Do the operation, and if any bits are set, link it into the - linked list. */ - switch (operation) - { - default: - abort (); +bool +bitmap_single_bit_set_p (const_bitmap a) +{ + unsigned long count = 0; + const bitmap_element *elt; + unsigned ix; - case BITMAP_AND: -#if BITMAP_ELEMENT_WORDS == 2 - to_ptr->bits[0] = from1_tmp->bits[0] & from2_tmp->bits[0]; - to_ptr->bits[1] = from1_tmp->bits[1] & from2_tmp->bits[1]; -#else - for (i = BITMAP_ELEMENT_WORDS - 1; i >= 0; i--) - to_ptr->bits[i] = from1_tmp->bits[i] & from2_tmp->bits[i]; -#endif - break; + if (bitmap_empty_p (a)) + return false; - case BITMAP_AND_COMPL: -#if BITMAP_ELEMENT_WORDS == 2 - to_ptr->bits[0] = from1_tmp->bits[0] & ~ from2_tmp->bits[0]; - to_ptr->bits[1] = from1_tmp->bits[1] & ~ from2_tmp->bits[1]; -#else - for (i = BITMAP_ELEMENT_WORDS - 1; i >= 0; i--) - to_ptr->bits[i] = from1_tmp->bits[i] & ~ from2_tmp->bits[i]; -#endif - break; + elt = a->first; + /* As there are no completely empty bitmap elements, a second one + means we have more than one bit set. */ + if (elt->next != NULL) + return false; - case BITMAP_IOR: -#if BITMAP_ELEMENT_WORDS == 2 - to_ptr->bits[0] = from1_tmp->bits[0] | from2_tmp->bits[0]; - to_ptr->bits[1] = from1_tmp->bits[1] | from2_tmp->bits[1]; + for (ix = 0; ix != BITMAP_ELEMENT_WORDS; ix++) + { +#if GCC_VERSION >= 3400 + /* Note that popcountl matches BITMAP_WORD in type, so the actual size + of BITMAP_WORD is not material. */ + count += __builtin_popcountl (elt->bits[ix]); #else - for (i = BITMAP_ELEMENT_WORDS - 1; i >= 0; i--) - to_ptr->bits[i] = from1_tmp->bits[i] | from2_tmp->bits[i]; + count += bitmap_popcount (elt->bits[ix]); #endif - break; - } - - if (! bitmap_element_zerop (to_ptr)) - { - to_ptr->indx = indx; - bitmap_element_link (to, to_ptr); - to_ptr = 0; - } + if (count > 1) + return false; } - /* If we have an unallocated element due to the last element being 0, - release it back to the free pool. Don't bother calling - bitmap_element_free since it was never linked into a bitmap. */ - if (to_ptr != 0) + return count == 1; +} + + +/* Return the bit number of the first set bit in the bitmap. The + bitmap must be non-empty. */ + +unsigned +bitmap_first_set_bit (const_bitmap a) +{ + const bitmap_element *elt = a->first; + unsigned bit_no; + BITMAP_WORD word; + unsigned ix; + + gcc_checking_assert (elt); + bit_no = elt->indx * BITMAP_ELEMENT_ALL_BITS; + for (ix = 0; ix != BITMAP_ELEMENT_WORDS; ix++) { - to_ptr->next = bitmap_free; - bitmap_free = to_ptr; + word = elt->bits[ix]; + if (word) + goto found_bit; } + gcc_unreachable (); + found_bit: + bit_no += ix * BITMAP_WORD_BITS; + +#if GCC_VERSION >= 3004 + gcc_assert (sizeof(long) == sizeof (word)); + bit_no += __builtin_ctzl (word); +#else + /* Binary search for the first set bit. */ +#if BITMAP_WORD_BITS > 64 +#error "Fill out the table." +#endif +#if BITMAP_WORD_BITS > 32 + if (!(word & 0xffffffff)) + word >>= 32, bit_no += 32; +#endif + if (!(word & 0xffff)) + word >>= 16, bit_no += 16; + if (!(word & 0xff)) + word >>= 8, bit_no += 8; + if (!(word & 0xf)) + word >>= 4, bit_no += 4; + if (!(word & 0x3)) + word >>= 2, bit_no += 2; + if (!(word & 0x1)) + word >>= 1, bit_no += 1; + + gcc_checking_assert (word & 1); +#endif + return bit_no; +} + +/* Return the bit number of the first set bit in the bitmap. The + bitmap must be non-empty. */ - /* If the output bitmap was one of the inputs, free up its - elements now that we're done. */ - for (; delete_list != 0; delete_list = to_ptr) +unsigned +bitmap_last_set_bit (const_bitmap a) +{ + const bitmap_element *elt = a->current ? a->current : a->first; + unsigned bit_no; + BITMAP_WORD word; + int ix; + + gcc_checking_assert (elt); + while (elt->next) + elt = elt->next; + bit_no = elt->indx * BITMAP_ELEMENT_ALL_BITS; + for (ix = BITMAP_ELEMENT_WORDS - 1; ix >= 0; ix--) { - to_ptr = delete_list->next; - delete_list->next = bitmap_free; - bitmap_free = delete_list; + word = elt->bits[ix]; + if (word) + goto found_bit; } + gcc_unreachable (); + found_bit: + bit_no += ix * BITMAP_WORD_BITS; + + /* Binary search for the last set bit. */ +#if GCC_VERSION >= 3004 + gcc_assert (sizeof(long) == sizeof (word)); + bit_no += sizeof (long) * 8 - __builtin_ctzl (word); +#else +#if BITMAP_WORD_BITS > 64 +#error "Fill out the table." +#endif +#if BITMAP_WORD_BITS > 32 + if ((word & 0xffffffff00000000)) + word >>= 32, bit_no += 32; +#endif + if (word & 0xffff0000) + word >>= 16, bit_no += 16; + if (!(word & 0xff00)) + word >>= 8, bit_no += 8; + if (!(word & 0xf0)) + word >>= 4, bit_no += 4; + if (!(word & 12)) + word >>= 2, bit_no += 2; + if (!(word & 2)) + word >>= 1, bit_no += 1; +#endif + + gcc_checking_assert (word & 1); + return bit_no; } -/* Or into bitmap TO bitmap FROM1 and'ed with the complement of - bitmap FROM2. */ + +/* DST = A & B. */ void -bitmap_ior_and_compl (to, from1, from2) - bitmap to; - bitmap from1; - bitmap from2; +bitmap_and (bitmap dst, const_bitmap a, const_bitmap b) { - bitmap_head tmp; + bitmap_element *dst_elt = dst->first; + const bitmap_element *a_elt = a->first; + const bitmap_element *b_elt = b->first; + bitmap_element *dst_prev = NULL; - tmp.first = tmp.current = 0; + gcc_assert (dst != a && dst != b); - bitmap_operation (&tmp, from1, from2, BITMAP_AND_COMPL); - bitmap_operation (to, to, &tmp, BITMAP_IOR); - bitmap_clear (&tmp); -} - -/* Initialize a bitmap header. */ + if (a == b) + { + bitmap_copy (dst, a); + return; + } -bitmap -bitmap_initialize (head) - bitmap head; -{ - head->first = head->current = 0; + while (a_elt && b_elt) + { + if (a_elt->indx < b_elt->indx) + a_elt = a_elt->next; + else if (b_elt->indx < a_elt->indx) + b_elt = b_elt->next; + else + { + /* Matching elts, generate A & B. */ + unsigned ix; + BITMAP_WORD ior = 0; + + if (!dst_elt) + dst_elt = bitmap_elt_insert_after (dst, dst_prev, a_elt->indx); + else + dst_elt->indx = a_elt->indx; + for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) + { + BITMAP_WORD r = a_elt->bits[ix] & b_elt->bits[ix]; - return head; + dst_elt->bits[ix] = r; + ior |= r; + } + if (ior) + { + dst_prev = dst_elt; + dst_elt = dst_elt->next; + } + a_elt = a_elt->next; + b_elt = b_elt->next; + } + } + /* Ensure that dst->current is valid. */ + dst->current = dst->first; + bitmap_elt_clear_from (dst, dst_elt); + gcc_checking_assert (!dst->current == !dst->first); + if (dst->current) + dst->indx = dst->current->indx; } - -/* Debugging function to print out the contents of a bitmap. */ + +/* A &= B. */ void -debug_bitmap_file (file, head) - FILE *file; - bitmap head; +bitmap_and_into (bitmap a, const_bitmap b) { - bitmap_element *ptr; + bitmap_element *a_elt = a->first; + const bitmap_element *b_elt = b->first; + bitmap_element *next; - fprintf (file, "\nfirst = "); - fprintf (file, HOST_PTR_PRINTF, head->first); - fprintf (file, " current = "); - fprintf (file, HOST_PTR_PRINTF, head->current); - fprintf (file, " indx = %u\n", head->indx); + if (a == b) + return; - for (ptr = head->first; ptr; ptr = ptr->next) + while (a_elt && b_elt) { - int i, j, col = 26; - - fprintf (file, "\t"); - fprintf (file, HOST_PTR_PRINTF, ptr); - fprintf (file, " next = "); - fprintf (file, HOST_PTR_PRINTF, ptr->next); - fprintf (file, " prev = "); - fprintf (file, HOST_PTR_PRINTF, ptr->prev); - fprintf (file, " indx = %u\n\t\tbits = {", ptr->indx); + if (a_elt->indx < b_elt->indx) + { + next = a_elt->next; + bitmap_element_free (a, a_elt); + a_elt = next; + } + else if (b_elt->indx < a_elt->indx) + b_elt = b_elt->next; + else + { + /* Matching elts, generate A &= B. */ + unsigned ix; + BITMAP_WORD ior = 0; - for (i = 0; i < BITMAP_ELEMENT_WORDS; i++) - for (j = 0; j < HOST_BITS_PER_WIDE_INT; j++) - if ((ptr->bits[i] & (((unsigned HOST_WIDE_INT) 1) << j)) != 0) + for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) { - if (col > 70) - { - fprintf (file, "\n\t\t\t"); - col = 24; - } + BITMAP_WORD r = a_elt->bits[ix] & b_elt->bits[ix]; - fprintf (file, " %u", (ptr->indx * BITMAP_ELEMENT_ALL_BITS - + i * HOST_BITS_PER_WIDE_INT + j)); - col += 4; + a_elt->bits[ix] = r; + ior |= r; } - - fprintf (file, " }\n"); + next = a_elt->next; + if (!ior) + bitmap_element_free (a, a_elt); + a_elt = next; + b_elt = b_elt->next; + } } + bitmap_elt_clear_from (a, a_elt); + gcc_checking_assert (!a->current == !a->first + && (!a->current || a->indx == a->current->indx)); } - -/* Function to be called from the debugger to print the contents - of a bitmap. */ -void -debug_bitmap (head) - bitmap head; -{ - debug_bitmap_file (stdout, head); -} - -/* Function to print out the contents of a bitmap. Unlike debug_bitmap_file, - it does not print anything but the bits. */ -void -bitmap_print (file, head, prefix, suffix) - FILE *file; - bitmap head; - const char *prefix; - const char *suffix; -{ - const char *comma = ""; - int i; +/* Insert an element equal to SRC_ELT after DST_PREV, overwriting DST_ELT + if non-NULL. CHANGED is true if the destination bitmap had already been + changed; the new value of CHANGED is returned. */ + +static inline bool +bitmap_elt_copy (bitmap dst, bitmap_element *dst_elt, bitmap_element *dst_prev, + const bitmap_element *src_elt, bool changed) +{ + if (!changed && dst_elt && dst_elt->indx == src_elt->indx) + { + unsigned ix; + + for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) + if (src_elt->bits[ix] != dst_elt->bits[ix]) + { + dst_elt->bits[ix] = src_elt->bits[ix]; + changed = true; + } + } + else + { + changed = true; + if (!dst_elt) + dst_elt = bitmap_elt_insert_after (dst, dst_prev, src_elt->indx); + else + dst_elt->indx = src_elt->indx; + memcpy (dst_elt->bits, src_elt->bits, sizeof (dst_elt->bits)); + } + return changed; +} + + + +/* DST = A & ~B */ + +bool +bitmap_and_compl (bitmap dst, const_bitmap a, const_bitmap b) +{ + bitmap_element *dst_elt = dst->first; + const bitmap_element *a_elt = a->first; + const bitmap_element *b_elt = b->first; + bitmap_element *dst_prev = NULL; + bitmap_element **dst_prev_pnext = &dst->first; + bool changed = false; + + gcc_assert (dst != a && dst != b); + + if (a == b) + { + changed = !bitmap_empty_p (dst); + bitmap_clear (dst); + return changed; + } + + while (a_elt) + { + while (b_elt && b_elt->indx < a_elt->indx) + b_elt = b_elt->next; + + if (!b_elt || b_elt->indx > a_elt->indx) + { + changed = bitmap_elt_copy (dst, dst_elt, dst_prev, a_elt, changed); + dst_prev = *dst_prev_pnext; + dst_prev_pnext = &dst_prev->next; + dst_elt = *dst_prev_pnext; + a_elt = a_elt->next; + } + + else + { + /* Matching elts, generate A & ~B. */ + unsigned ix; + BITMAP_WORD ior = 0; + + if (!changed && dst_elt && dst_elt->indx == a_elt->indx) + { + for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) + { + BITMAP_WORD r = a_elt->bits[ix] & ~b_elt->bits[ix]; + + if (dst_elt->bits[ix] != r) + { + changed = true; + dst_elt->bits[ix] = r; + } + ior |= r; + } + } + else + { + bool new_element; + if (!dst_elt || dst_elt->indx > a_elt->indx) + { + dst_elt = bitmap_elt_insert_after (dst, dst_prev, a_elt->indx); + new_element = true; + } + else + { + dst_elt->indx = a_elt->indx; + new_element = false; + } + + for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) + { + BITMAP_WORD r = a_elt->bits[ix] & ~b_elt->bits[ix]; + + dst_elt->bits[ix] = r; + ior |= r; + } + + if (ior) + changed = true; + else + { + changed |= !new_element; + bitmap_element_free (dst, dst_elt); + dst_elt = *dst_prev_pnext; + } + } + + if (ior) + { + dst_prev = *dst_prev_pnext; + dst_prev_pnext = &dst_prev->next; + dst_elt = *dst_prev_pnext; + } + a_elt = a_elt->next; + b_elt = b_elt->next; + } + } + + /* Ensure that dst->current is valid. */ + dst->current = dst->first; + + if (dst_elt) + { + changed = true; + bitmap_elt_clear_from (dst, dst_elt); + } + gcc_checking_assert (!dst->current == !dst->first); + if (dst->current) + dst->indx = dst->current->indx; + + return changed; +} + +/* A &= ~B. Returns true if A changes */ + +bool +bitmap_and_compl_into (bitmap a, const_bitmap b) +{ + bitmap_element *a_elt = a->first; + const bitmap_element *b_elt = b->first; + bitmap_element *next; + BITMAP_WORD changed = 0; + + if (a == b) + { + if (bitmap_empty_p (a)) + return false; + else + { + bitmap_clear (a); + return true; + } + } + + while (a_elt && b_elt) + { + if (a_elt->indx < b_elt->indx) + a_elt = a_elt->next; + else if (b_elt->indx < a_elt->indx) + b_elt = b_elt->next; + else + { + /* Matching elts, generate A &= ~B. */ + unsigned ix; + BITMAP_WORD ior = 0; + + for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) + { + BITMAP_WORD cleared = a_elt->bits[ix] & b_elt->bits[ix]; + BITMAP_WORD r = a_elt->bits[ix] ^ cleared; + + a_elt->bits[ix] = r; + changed |= cleared; + ior |= r; + } + next = a_elt->next; + if (!ior) + bitmap_element_free (a, a_elt); + a_elt = next; + b_elt = b_elt->next; + } + } + gcc_checking_assert (!a->current == !a->first + && (!a->current || a->indx == a->current->indx)); + return changed != 0; +} + +/* Set COUNT bits from START in HEAD. */ +void +bitmap_set_range (bitmap head, unsigned int start, unsigned int count) +{ + unsigned int first_index, end_bit_plus1, last_index; + bitmap_element *elt, *elt_prev; + unsigned int i; + + if (!count) + return; + + first_index = start / BITMAP_ELEMENT_ALL_BITS; + end_bit_plus1 = start + count; + last_index = (end_bit_plus1 - 1) / BITMAP_ELEMENT_ALL_BITS; + elt = bitmap_find_bit (head, start); + + /* If bitmap_find_bit returns zero, the current is the closest block + to the result. Otherwise, just use bitmap_element_allocate to + ensure ELT is set; in the loop below, ELT == NULL means "insert + at the end of the bitmap". */ + if (!elt) + { + elt = bitmap_element_allocate (head); + elt->indx = first_index; + bitmap_element_link (head, elt); + } + + gcc_checking_assert (elt->indx == first_index); + elt_prev = elt->prev; + for (i = first_index; i <= last_index; i++) + { + unsigned elt_start_bit = i * BITMAP_ELEMENT_ALL_BITS; + unsigned elt_end_bit_plus1 = elt_start_bit + BITMAP_ELEMENT_ALL_BITS; + + unsigned int first_word_to_mod; + BITMAP_WORD first_mask; + unsigned int last_word_to_mod; + BITMAP_WORD last_mask; + unsigned int ix; + + if (!elt || elt->indx != i) + elt = bitmap_elt_insert_after (head, elt_prev, i); + + if (elt_start_bit <= start) + { + /* The first bit to turn on is somewhere inside this + elt. */ + first_word_to_mod = (start - elt_start_bit) / BITMAP_WORD_BITS; + + /* This mask should have 1s in all bits >= start position. */ + first_mask = + (((BITMAP_WORD) 1) << ((start % BITMAP_WORD_BITS))) - 1; + first_mask = ~first_mask; + } + else + { + /* The first bit to turn on is below this start of this elt. */ + first_word_to_mod = 0; + first_mask = ~(BITMAP_WORD) 0; + } + + if (elt_end_bit_plus1 <= end_bit_plus1) + { + /* The last bit to turn on is beyond this elt. */ + last_word_to_mod = BITMAP_ELEMENT_WORDS - 1; + last_mask = ~(BITMAP_WORD) 0; + } + else + { + /* The last bit to turn on is inside to this elt. */ + last_word_to_mod = + (end_bit_plus1 - elt_start_bit) / BITMAP_WORD_BITS; + + /* The last mask should have 1s below the end bit. */ + last_mask = + (((BITMAP_WORD) 1) << ((end_bit_plus1 % BITMAP_WORD_BITS))) - 1; + } + + if (first_word_to_mod == last_word_to_mod) + { + BITMAP_WORD mask = first_mask & last_mask; + elt->bits[first_word_to_mod] |= mask; + } + else + { + elt->bits[first_word_to_mod] |= first_mask; + if (BITMAP_ELEMENT_WORDS > 2) + for (ix = first_word_to_mod + 1; ix < last_word_to_mod; ix++) + elt->bits[ix] = ~(BITMAP_WORD) 0; + elt->bits[last_word_to_mod] |= last_mask; + } + + elt_prev = elt; + elt = elt->next; + } + + head->current = elt ? elt : elt_prev; + head->indx = head->current->indx; +} + +/* Clear COUNT bits from START in HEAD. */ +void +bitmap_clear_range (bitmap head, unsigned int start, unsigned int count) +{ + unsigned int first_index, end_bit_plus1, last_index; + bitmap_element *elt; + + if (!count) + return; + + first_index = start / BITMAP_ELEMENT_ALL_BITS; + end_bit_plus1 = start + count; + last_index = (end_bit_plus1 - 1) / BITMAP_ELEMENT_ALL_BITS; + elt = bitmap_find_bit (head, start); + + /* If bitmap_find_bit returns zero, the current is the closest block + to the result. If the current is less than first index, find the + next one. Otherwise, just set elt to be current. */ + if (!elt) + { + if (head->current) + { + if (head->indx < first_index) + { + elt = head->current->next; + if (!elt) + return; + } + else + elt = head->current; + } + else + return; + } + + while (elt && (elt->indx <= last_index)) + { + bitmap_element * next_elt = elt->next; + unsigned elt_start_bit = (elt->indx) * BITMAP_ELEMENT_ALL_BITS; + unsigned elt_end_bit_plus1 = elt_start_bit + BITMAP_ELEMENT_ALL_BITS; + + + if (elt_start_bit >= start && elt_end_bit_plus1 <= end_bit_plus1) + /* Get rid of the entire elt and go to the next one. */ + bitmap_element_free (head, elt); + else + { + /* Going to have to knock out some bits in this elt. */ + unsigned int first_word_to_mod; + BITMAP_WORD first_mask; + unsigned int last_word_to_mod; + BITMAP_WORD last_mask; + unsigned int i; + bool clear = true; + + if (elt_start_bit <= start) + { + /* The first bit to turn off is somewhere inside this + elt. */ + first_word_to_mod = (start - elt_start_bit) / BITMAP_WORD_BITS; + + /* This mask should have 1s in all bits >= start position. */ + first_mask = + (((BITMAP_WORD) 1) << ((start % BITMAP_WORD_BITS))) - 1; + first_mask = ~first_mask; + } + else + { + /* The first bit to turn off is below this start of this elt. */ + first_word_to_mod = 0; + first_mask = 0; + first_mask = ~first_mask; + } + + if (elt_end_bit_plus1 <= end_bit_plus1) + { + /* The last bit to turn off is beyond this elt. */ + last_word_to_mod = BITMAP_ELEMENT_WORDS - 1; + last_mask = 0; + last_mask = ~last_mask; + } + else + { + /* The last bit to turn off is inside to this elt. */ + last_word_to_mod = + (end_bit_plus1 - elt_start_bit) / BITMAP_WORD_BITS; + + /* The last mask should have 1s below the end bit. */ + last_mask = + (((BITMAP_WORD) 1) << (((end_bit_plus1) % BITMAP_WORD_BITS))) - 1; + } + + + if (first_word_to_mod == last_word_to_mod) + { + BITMAP_WORD mask = first_mask & last_mask; + elt->bits[first_word_to_mod] &= ~mask; + } + else + { + elt->bits[first_word_to_mod] &= ~first_mask; + if (BITMAP_ELEMENT_WORDS > 2) + for (i = first_word_to_mod + 1; i < last_word_to_mod; i++) + elt->bits[i] = 0; + elt->bits[last_word_to_mod] &= ~last_mask; + } + for (i = 0; i < BITMAP_ELEMENT_WORDS; i++) + if (elt->bits[i]) + { + clear = false; + break; + } + /* Check to see if there are any bits left. */ + if (clear) + bitmap_element_free (head, elt); + } + elt = next_elt; + } + + if (elt) + { + head->current = elt; + head->indx = head->current->indx; + } +} + +/* A = ~A & B. */ + +void +bitmap_compl_and_into (bitmap a, const_bitmap b) +{ + bitmap_element *a_elt = a->first; + const bitmap_element *b_elt = b->first; + bitmap_element *a_prev = NULL; + bitmap_element *next; + + gcc_assert (a != b); + + if (bitmap_empty_p (a)) + { + bitmap_copy (a, b); + return; + } + if (bitmap_empty_p (b)) + { + bitmap_clear (a); + return; + } + + while (a_elt || b_elt) + { + if (!b_elt || (a_elt && a_elt->indx < b_elt->indx)) + { + /* A is before B. Remove A */ + next = a_elt->next; + a_prev = a_elt->prev; + bitmap_element_free (a, a_elt); + a_elt = next; + } + else if (!a_elt || b_elt->indx < a_elt->indx) + { + /* B is before A. Copy B. */ + next = bitmap_elt_insert_after (a, a_prev, b_elt->indx); + memcpy (next->bits, b_elt->bits, sizeof (next->bits)); + a_prev = next; + b_elt = b_elt->next; + } + else + { + /* Matching elts, generate A = ~A & B. */ + unsigned ix; + BITMAP_WORD ior = 0; + + for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) + { + BITMAP_WORD cleared = a_elt->bits[ix] & b_elt->bits[ix]; + BITMAP_WORD r = b_elt->bits[ix] ^ cleared; + + a_elt->bits[ix] = r; + ior |= r; + } + next = a_elt->next; + if (!ior) + bitmap_element_free (a, a_elt); + else + a_prev = a_elt; + a_elt = next; + b_elt = b_elt->next; + } + } + gcc_checking_assert (!a->current == !a->first + && (!a->current || a->indx == a->current->indx)); + return; +} + + +/* Insert an element corresponding to A_ELT | B_ELT after DST_PREV, + overwriting DST_ELT if non-NULL. CHANGED is true if the destination bitmap + had already been changed; the new value of CHANGED is returned. */ + +static inline bool +bitmap_elt_ior (bitmap dst, bitmap_element *dst_elt, bitmap_element *dst_prev, + const bitmap_element *a_elt, const bitmap_element *b_elt, + bool changed) +{ + gcc_assert (a_elt || b_elt); + + if (a_elt && b_elt && a_elt->indx == b_elt->indx) + { + /* Matching elts, generate A | B. */ + unsigned ix; + + if (!changed && dst_elt && dst_elt->indx == a_elt->indx) + { + for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) + { + BITMAP_WORD r = a_elt->bits[ix] | b_elt->bits[ix]; + if (r != dst_elt->bits[ix]) + { + dst_elt->bits[ix] = r; + changed = true; + } + } + } + else + { + changed = true; + if (!dst_elt) + dst_elt = bitmap_elt_insert_after (dst, dst_prev, a_elt->indx); + else + dst_elt->indx = a_elt->indx; + for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) + { + BITMAP_WORD r = a_elt->bits[ix] | b_elt->bits[ix]; + dst_elt->bits[ix] = r; + } + } + } + else + { + /* Copy a single element. */ + const bitmap_element *src; + + if (!b_elt || (a_elt && a_elt->indx < b_elt->indx)) + src = a_elt; + else + src = b_elt; + + gcc_checking_assert (src); + changed = bitmap_elt_copy (dst, dst_elt, dst_prev, src, changed); + } + return changed; +} + + +/* DST = A | B. Return true if DST changes. */ + +bool +bitmap_ior (bitmap dst, const_bitmap a, const_bitmap b) +{ + bitmap_element *dst_elt = dst->first; + const bitmap_element *a_elt = a->first; + const bitmap_element *b_elt = b->first; + bitmap_element *dst_prev = NULL; + bitmap_element **dst_prev_pnext = &dst->first; + bool changed = false; + + gcc_assert (dst != a && dst != b); + + while (a_elt || b_elt) + { + changed = bitmap_elt_ior (dst, dst_elt, dst_prev, a_elt, b_elt, changed); + + if (a_elt && b_elt && a_elt->indx == b_elt->indx) + { + a_elt = a_elt->next; + b_elt = b_elt->next; + } + else + { + if (a_elt && (!b_elt || a_elt->indx <= b_elt->indx)) + a_elt = a_elt->next; + else if (b_elt && (!a_elt || b_elt->indx <= a_elt->indx)) + b_elt = b_elt->next; + } + + dst_prev = *dst_prev_pnext; + dst_prev_pnext = &dst_prev->next; + dst_elt = *dst_prev_pnext; + } + + if (dst_elt) + { + changed = true; + bitmap_elt_clear_from (dst, dst_elt); + } + gcc_checking_assert (!dst->current == !dst->first); + if (dst->current) + dst->indx = dst->current->indx; + return changed; +} + +/* A |= B. Return true if A changes. */ + +bool +bitmap_ior_into (bitmap a, const_bitmap b) +{ + bitmap_element *a_elt = a->first; + const bitmap_element *b_elt = b->first; + bitmap_element *a_prev = NULL; + bitmap_element **a_prev_pnext = &a->first; + bool changed = false; + + if (a == b) + return false; + + while (b_elt) + { + /* If A lags behind B, just advance it. */ + if (!a_elt || a_elt->indx == b_elt->indx) + { + changed = bitmap_elt_ior (a, a_elt, a_prev, a_elt, b_elt, changed); + b_elt = b_elt->next; + } + else if (a_elt->indx > b_elt->indx) + { + changed = bitmap_elt_copy (a, NULL, a_prev, b_elt, changed); + b_elt = b_elt->next; + } + + a_prev = *a_prev_pnext; + a_prev_pnext = &a_prev->next; + a_elt = *a_prev_pnext; + } + + gcc_checking_assert (!a->current == !a->first); + if (a->current) + a->indx = a->current->indx; + return changed; +} + +/* DST = A ^ B */ + +void +bitmap_xor (bitmap dst, const_bitmap a, const_bitmap b) +{ + bitmap_element *dst_elt = dst->first; + const bitmap_element *a_elt = a->first; + const bitmap_element *b_elt = b->first; + bitmap_element *dst_prev = NULL; + + gcc_assert (dst != a && dst != b); + if (a == b) + { + bitmap_clear (dst); + return; + } + + while (a_elt || b_elt) + { + if (a_elt && b_elt && a_elt->indx == b_elt->indx) + { + /* Matching elts, generate A ^ B. */ + unsigned ix; + BITMAP_WORD ior = 0; + + if (!dst_elt) + dst_elt = bitmap_elt_insert_after (dst, dst_prev, a_elt->indx); + else + dst_elt->indx = a_elt->indx; + for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) + { + BITMAP_WORD r = a_elt->bits[ix] ^ b_elt->bits[ix]; + + ior |= r; + dst_elt->bits[ix] = r; + } + a_elt = a_elt->next; + b_elt = b_elt->next; + if (ior) + { + dst_prev = dst_elt; + dst_elt = dst_elt->next; + } + } + else + { + /* Copy a single element. */ + const bitmap_element *src; + + if (!b_elt || (a_elt && a_elt->indx < b_elt->indx)) + { + src = a_elt; + a_elt = a_elt->next; + } + else + { + src = b_elt; + b_elt = b_elt->next; + } + + if (!dst_elt) + dst_elt = bitmap_elt_insert_after (dst, dst_prev, src->indx); + else + dst_elt->indx = src->indx; + memcpy (dst_elt->bits, src->bits, sizeof (dst_elt->bits)); + dst_prev = dst_elt; + dst_elt = dst_elt->next; + } + } + /* Ensure that dst->current is valid. */ + dst->current = dst->first; + bitmap_elt_clear_from (dst, dst_elt); + gcc_checking_assert (!dst->current == !dst->first); + if (dst->current) + dst->indx = dst->current->indx; +} + +/* A ^= B */ + +void +bitmap_xor_into (bitmap a, const_bitmap b) +{ + bitmap_element *a_elt = a->first; + const bitmap_element *b_elt = b->first; + bitmap_element *a_prev = NULL; + + if (a == b) + { + bitmap_clear (a); + return; + } + + while (b_elt) + { + if (!a_elt || b_elt->indx < a_elt->indx) + { + /* Copy b_elt. */ + bitmap_element *dst = bitmap_elt_insert_after (a, a_prev, b_elt->indx); + memcpy (dst->bits, b_elt->bits, sizeof (dst->bits)); + a_prev = dst; + b_elt = b_elt->next; + } + else if (a_elt->indx < b_elt->indx) + { + a_prev = a_elt; + a_elt = a_elt->next; + } + else + { + /* Matching elts, generate A ^= B. */ + unsigned ix; + BITMAP_WORD ior = 0; + bitmap_element *next = a_elt->next; + + for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) + { + BITMAP_WORD r = a_elt->bits[ix] ^ b_elt->bits[ix]; + + ior |= r; + a_elt->bits[ix] = r; + } + b_elt = b_elt->next; + if (ior) + a_prev = a_elt; + else + bitmap_element_free (a, a_elt); + a_elt = next; + } + } + gcc_checking_assert (!a->current == !a->first); + if (a->current) + a->indx = a->current->indx; +} + +/* Return true if two bitmaps are identical. + We do not bother with a check for pointer equality, as that never + occurs in practice. */ + +bool +bitmap_equal_p (const_bitmap a, const_bitmap b) +{ + const bitmap_element *a_elt; + const bitmap_element *b_elt; + unsigned ix; + + for (a_elt = a->first, b_elt = b->first; + a_elt && b_elt; + a_elt = a_elt->next, b_elt = b_elt->next) + { + if (a_elt->indx != b_elt->indx) + return false; + for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) + if (a_elt->bits[ix] != b_elt->bits[ix]) + return false; + } + return !a_elt && !b_elt; +} + +/* Return true if A AND B is not empty. */ + +bool +bitmap_intersect_p (const_bitmap a, const_bitmap b) +{ + const bitmap_element *a_elt; + const bitmap_element *b_elt; + unsigned ix; + + for (a_elt = a->first, b_elt = b->first; + a_elt && b_elt;) + { + if (a_elt->indx < b_elt->indx) + a_elt = a_elt->next; + else if (b_elt->indx < a_elt->indx) + b_elt = b_elt->next; + else + { + for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) + if (a_elt->bits[ix] & b_elt->bits[ix]) + return true; + a_elt = a_elt->next; + b_elt = b_elt->next; + } + } + return false; +} + +/* Return true if A AND NOT B is not empty. */ + +bool +bitmap_intersect_compl_p (const_bitmap a, const_bitmap b) +{ + const bitmap_element *a_elt; + const bitmap_element *b_elt; + unsigned ix; + for (a_elt = a->first, b_elt = b->first; + a_elt && b_elt;) + { + if (a_elt->indx < b_elt->indx) + return true; + else if (b_elt->indx < a_elt->indx) + b_elt = b_elt->next; + else + { + for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) + if (a_elt->bits[ix] & ~b_elt->bits[ix]) + return true; + a_elt = a_elt->next; + b_elt = b_elt->next; + } + } + return a_elt != NULL; +} + + +/* DST = A | (FROM1 & ~FROM2). Return true if DST changes. */ + +bool +bitmap_ior_and_compl (bitmap dst, const_bitmap a, const_bitmap b, const_bitmap kill) +{ + bool changed = false; + + bitmap_element *dst_elt = dst->first; + const bitmap_element *a_elt = a->first; + const bitmap_element *b_elt = b->first; + const bitmap_element *kill_elt = kill->first; + bitmap_element *dst_prev = NULL; + bitmap_element **dst_prev_pnext = &dst->first; + + gcc_assert (dst != a && dst != b && dst != kill); + + /* Special cases. We don't bother checking for bitmap_equal_p (b, kill). */ + if (b == kill || bitmap_empty_p (b)) + { + changed = !bitmap_equal_p (dst, a); + if (changed) + bitmap_copy (dst, a); + return changed; + } + if (bitmap_empty_p (kill)) + return bitmap_ior (dst, a, b); + if (bitmap_empty_p (a)) + return bitmap_and_compl (dst, b, kill); + + while (a_elt || b_elt) + { + bool new_element = false; + + if (b_elt) + while (kill_elt && kill_elt->indx < b_elt->indx) + kill_elt = kill_elt->next; + + if (b_elt && kill_elt && kill_elt->indx == b_elt->indx + && (!a_elt || a_elt->indx >= b_elt->indx)) + { + bitmap_element tmp_elt; + unsigned ix; + + BITMAP_WORD ior = 0; + tmp_elt.indx = b_elt->indx; + for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) + { + BITMAP_WORD r = b_elt->bits[ix] & ~kill_elt->bits[ix]; + ior |= r; + tmp_elt.bits[ix] = r; + } + + if (ior) + { + changed = bitmap_elt_ior (dst, dst_elt, dst_prev, + a_elt, &tmp_elt, changed); + new_element = true; + if (a_elt && a_elt->indx == b_elt->indx) + a_elt = a_elt->next; + } + + b_elt = b_elt->next; + kill_elt = kill_elt->next; + } + else + { + changed = bitmap_elt_ior (dst, dst_elt, dst_prev, + a_elt, b_elt, changed); + new_element = true; + + if (a_elt && b_elt && a_elt->indx == b_elt->indx) + { + a_elt = a_elt->next; + b_elt = b_elt->next; + } + else + { + if (a_elt && (!b_elt || a_elt->indx <= b_elt->indx)) + a_elt = a_elt->next; + else if (b_elt && (!a_elt || b_elt->indx <= a_elt->indx)) + b_elt = b_elt->next; + } + } + + if (new_element) + { + dst_prev = *dst_prev_pnext; + dst_prev_pnext = &dst_prev->next; + dst_elt = *dst_prev_pnext; + } + } + + if (dst_elt) + { + changed = true; + bitmap_elt_clear_from (dst, dst_elt); + } + gcc_checking_assert (!dst->current == !dst->first); + if (dst->current) + dst->indx = dst->current->indx; + + return changed; +} + +/* A |= (FROM1 & ~FROM2). Return true if A changes. */ + +bool +bitmap_ior_and_compl_into (bitmap a, const_bitmap from1, const_bitmap from2) +{ + bitmap_head tmp; + bool changed; + + bitmap_initialize (&tmp, &bitmap_default_obstack); + bitmap_and_compl (&tmp, from1, from2); + changed = bitmap_ior_into (a, &tmp); + bitmap_clear (&tmp); + + return changed; +} + +/* A |= (B & C). Return true if A changes. */ + +bool +bitmap_ior_and_into (bitmap a, const_bitmap b, const_bitmap c) +{ + bitmap_element *a_elt = a->first; + const bitmap_element *b_elt = b->first; + const bitmap_element *c_elt = c->first; + bitmap_element and_elt; + bitmap_element *a_prev = NULL; + bitmap_element **a_prev_pnext = &a->first; + bool changed = false; + unsigned ix; + + if (b == c) + return bitmap_ior_into (a, b); + if (bitmap_empty_p (b) || bitmap_empty_p (c)) + return false; + + and_elt.indx = -1; + while (b_elt && c_elt) + { + BITMAP_WORD overall; + + /* Find a common item of B and C. */ + while (b_elt->indx != c_elt->indx) + { + if (b_elt->indx < c_elt->indx) + { + b_elt = b_elt->next; + if (!b_elt) + goto done; + } + else + { + c_elt = c_elt->next; + if (!c_elt) + goto done; + } + } + + overall = 0; + and_elt.indx = b_elt->indx; + for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) + { + and_elt.bits[ix] = b_elt->bits[ix] & c_elt->bits[ix]; + overall |= and_elt.bits[ix]; + } + + b_elt = b_elt->next; + c_elt = c_elt->next; + if (!overall) + continue; + + /* Now find a place to insert AND_ELT. */ + do + { + ix = a_elt ? a_elt->indx : and_elt.indx; + if (ix == and_elt.indx) + changed = bitmap_elt_ior (a, a_elt, a_prev, a_elt, &and_elt, changed); + else if (ix > and_elt.indx) + changed = bitmap_elt_copy (a, NULL, a_prev, &and_elt, changed); + + a_prev = *a_prev_pnext; + a_prev_pnext = &a_prev->next; + a_elt = *a_prev_pnext; + + /* If A lagged behind B/C, we advanced it so loop once more. */ + } + while (ix < and_elt.indx); + } + + done: + gcc_checking_assert (!a->current == !a->first); + if (a->current) + a->indx = a->current->indx; + return changed; +} + +/* Debugging function to print out the contents of a bitmap. */ + +DEBUG_FUNCTION void +debug_bitmap_file (FILE *file, const_bitmap head) +{ + const bitmap_element *ptr; + + fprintf (file, "\nfirst = " HOST_PTR_PRINTF + " current = " HOST_PTR_PRINTF " indx = %u\n", + (void *) head->first, (void *) head->current, head->indx); + + for (ptr = head->first; ptr; ptr = ptr->next) + { + unsigned int i, j, col = 26; + + fprintf (file, "\t" HOST_PTR_PRINTF " next = " HOST_PTR_PRINTF + " prev = " HOST_PTR_PRINTF " indx = %u\n\t\tbits = {", + (const void*) ptr, (const void*) ptr->next, + (const void*) ptr->prev, ptr->indx); + + for (i = 0; i < BITMAP_ELEMENT_WORDS; i++) + for (j = 0; j < BITMAP_WORD_BITS; j++) + if ((ptr->bits[i] >> j) & 1) + { + if (col > 70) + { + fprintf (file, "\n\t\t\t"); + col = 24; + } + + fprintf (file, " %u", (ptr->indx * BITMAP_ELEMENT_ALL_BITS + + i * BITMAP_WORD_BITS + j)); + col += 4; + } + + fprintf (file, " }\n"); + } +} + +/* Function to be called from the debugger to print the contents + of a bitmap. */ + +DEBUG_FUNCTION void +debug_bitmap (const_bitmap head) +{ + debug_bitmap_file (stdout, head); +} + +/* Function to print out the contents of a bitmap. Unlike debug_bitmap_file, + it does not print anything but the bits. */ + +DEBUG_FUNCTION void +bitmap_print (FILE *file, const_bitmap head, const char *prefix, const char *suffix) +{ + const char *comma = ""; + unsigned i; + bitmap_iterator bi; fputs (prefix, file); - EXECUTE_IF_SET_IN_BITMAP (head, 0, i, - { - fprintf (file, "%s%d", comma, i); - comma = ", "; - }); + EXECUTE_IF_SET_IN_BITMAP (head, 0, i, bi) + { + fprintf (file, "%s%d", comma, i); + comma = ", "; + } fputs (suffix, file); } - -/* Release any memory allocated by bitmaps. */ +#ifdef GATHER_STATISTICS + + +/* Used to accumulate statistics about bitmap sizes. */ +struct output_info +{ + HOST_WIDEST_INT size; + int count; +}; + +/* Called via htab_traverse. Output bitmap descriptor pointed out by SLOT + and update statistics. */ +static int +print_statistics (void **slot, void *b) +{ + struct bitmap_descriptor *d = (struct bitmap_descriptor *) *slot; + struct output_info *i = (struct output_info *) b; + char s[4096]; + if (d->allocated) + { + const char *s1 = d->file; + const char *s2; + while ((s2 = strstr (s1, "gcc/"))) + s1 = s2 + 4; + sprintf (s, "%s:%i (%s)", s1, d->line, d->function); + s[41] = 0; + fprintf (stderr, "%-41s %8d %15"HOST_WIDEST_INT_PRINT"d %15" + HOST_WIDEST_INT_PRINT"d %15"HOST_WIDEST_INT_PRINT"d %10d %10d\n", + s, d->created, d->allocated, d->peak, d->current, d->nsearches, + d->search_iter); + i->size += d->allocated; + i->count += d->created; + } + return 1; +} +#endif +/* Output per-bitmap memory usage statistics. */ void -bitmap_release_memory () +dump_bitmap_statistics (void) { - bitmap_free = 0; - if (bitmap_obstack_init) +#ifdef GATHER_STATISTICS + struct output_info info; + + if (!bitmap_desc_hash) + return; + + fprintf (stderr, "\nBitmap Overall " + " Allocated Peak Leak searched " + " search itr\n"); + fprintf (stderr, "---------------------------------------------------------------------------------\n"); + info.count = 0; + info.size = 0; + htab_traverse (bitmap_desc_hash, print_statistics, &info); + fprintf (stderr, "---------------------------------------------------------------------------------\n"); + fprintf (stderr, "%-40s %9d %15"HOST_WIDEST_INT_PRINT"d\n", + "Total", info.count, info.size); + fprintf (stderr, "---------------------------------------------------------------------------------\n"); +#endif +} + +/* Compute hash of bitmap (for purposes of hashing). */ +hashval_t +bitmap_hash (const_bitmap head) +{ + const bitmap_element *ptr; + BITMAP_WORD hash = 0; + int ix; + + for (ptr = head->first; ptr; ptr = ptr->next) { - bitmap_obstack_init = FALSE; - obstack_free (&bitmap_obstack, NULL_PTR); + hash ^= ptr->indx; + for (ix = 0; ix != BITMAP_ELEMENT_WORDS; ix++) + hash ^= ptr->bits[ix]; } + return (hashval_t)hash; } + +#include "gt-bitmap.h"