X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fbitmap.c;h=5e841e067a5e5fd2b8da5b2cdefbdfdf7a2069f5;hb=a55bafe44d7e4abc77979f6b5021c846f71204c5;hp=efc789a3211a4c9c5e3cb92b9126e8e3c3430f37;hpb=a0c938f0e74166de102281ac2f445e4be5ff257e;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/bitmap.c b/gcc/bitmap.c index efc789a3211..5e841e067a5 100644 --- a/gcc/bitmap.c +++ b/gcc/bitmap.c @@ -1,12 +1,12 @@ /* Functions to support general ended bitmaps. - Copyright (C) 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005 - Free Software Foundation, Inc. + Copyright (C) 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, + 2006, 2007 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 @@ -15,9 +15,8 @@ FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License -along with GCC; see the file COPYING. If not, write to the Free -Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA -02110-1301, USA. */ +along with GCC; see the file COPYING3. If not see +. */ #include "config.h" #include "system.h" @@ -28,17 +27,108 @@ Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA #include "obstack.h" #include "ggc.h" #include "bitmap.h" +#include "hashtab.h" + +#ifdef GATHER_STATISTICS + +/* Store information about each particular bitmap. */ +struct bitmap_descriptor +{ + const char *function; + const char *file; + int line; + int allocated; + int created; + int peak; + int current; + int nsearches; +}; + +/* 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, + 1); + 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_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 (bitmap_element *); +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 *); @@ -92,6 +182,9 @@ bitmap_element_free (bitmap head, bitmap_element *elt) else head->indx = 0; } +#ifdef GATHER_STATISTICS + register_overhead (head, -((int)sizeof (bitmap_element))); +#endif bitmap_elem_to_freelist (head, elt); } @@ -139,6 +232,9 @@ bitmap_element_allocate (bitmap head) element = GGC_NEW (bitmap_element); } +#ifdef GATHER_STATISTICS + register_overhead (head, sizeof (bitmap_element)); +#endif memset (element->bits, 0, sizeof (element->bits)); return element; @@ -151,8 +247,17 @@ bitmap_elt_clear_from (bitmap head, bitmap_element *elt) { bitmap_element *prev; bitmap_obstack *bit_obstack = head->obstack; +#ifdef GATHER_STATISTICS + int n; +#endif 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) @@ -200,7 +305,11 @@ void bitmap_obstack_initialize (bitmap_obstack *bit_obstack) { if (!bit_obstack) - bit_obstack = &bitmap_default_obstack; + { + if (bitmap_default_obstack_depth++) + return; + bit_obstack = &bitmap_default_obstack; + } #if !defined(__GNUC__) || (__GNUC__ < 2) #define __alignof__(type) 0 @@ -221,7 +330,14 @@ void bitmap_obstack_release (bitmap_obstack *bit_obstack) { if (!bit_obstack) - bit_obstack = &bitmap_default_obstack; + { + if (--bitmap_default_obstack_depth) + { + gcc_assert (bitmap_default_obstack_depth > 0); + return; + } + bit_obstack = &bitmap_default_obstack; + } bit_obstack->elements = NULL; bit_obstack->heads = NULL; @@ -232,7 +348,7 @@ bitmap_obstack_release (bitmap_obstack *bit_obstack) it on the default bitmap obstack. */ bitmap -bitmap_obstack_alloc (bitmap_obstack *bit_obstack) +bitmap_obstack_alloc_stat (bitmap_obstack *bit_obstack MEM_STAT_DECL) { bitmap map; @@ -243,7 +359,10 @@ bitmap_obstack_alloc (bitmap_obstack *bit_obstack) bit_obstack->heads = (void *)map->first; else map = XOBNEW (&bit_obstack->obstack, bitmap_head); - bitmap_initialize (map, bit_obstack); + bitmap_initialize_stat (map, bit_obstack PASS_MEM_STAT); +#ifdef GATHER_STATISTICS + register_overhead (map, sizeof (bitmap_head)); +#endif return map; } @@ -251,12 +370,15 @@ bitmap_obstack_alloc (bitmap_obstack *bit_obstack) /* Create a new GCd bitmap. */ bitmap -bitmap_gc_alloc (void) +bitmap_gc_alloc_stat (ALONE_MEM_STAT_DECL) { bitmap map; map = GGC_NEW (struct bitmap_head_def); - bitmap_initialize (map, NULL); + bitmap_initialize_stat (map, NULL PASS_MEM_STAT); +#ifdef GATHER_STATISTICS + register_overhead (map, sizeof (bitmap_head)); +#endif return map; } @@ -270,6 +392,9 @@ bitmap_obstack_free (bitmap map) { bitmap_clear (map); map->first = (void *)map->obstack->heads; +#ifdef GATHER_STATISTICS + register_overhead (map, -((int)sizeof (bitmap_head))); +#endif map->obstack->heads = map; } } @@ -278,7 +403,7 @@ bitmap_obstack_free (bitmap map) /* Return nonzero if all bits in an element are zero. */ static inline int -bitmap_element_zerop (bitmap_element *element) +bitmap_element_zerop (const bitmap_element *element) { #if BITMAP_ELEMENT_WORDS == 2 return (element->bits[0] | element->bits[1]) == 0; @@ -386,9 +511,10 @@ bitmap_elt_insert_after (bitmap head, bitmap_element *elt, unsigned int indx) /* Copy a bitmap to another bitmap. */ void -bitmap_copy (bitmap to, bitmap from) +bitmap_copy (bitmap to, const_bitmap from) { - bitmap_element *from_ptr, *to_ptr = 0; + const bitmap_element *from_ptr; + bitmap_element *to_ptr = 0; bitmap_clear (to); @@ -430,6 +556,9 @@ bitmap_find_bit (bitmap head, unsigned int bit) bitmap_element *element; unsigned int indx = bit / BITMAP_ELEMENT_ALL_BITS; +#ifdef GATHER_STATISTICS + head->desc->nsearches++; +#endif if (head->current == 0 || head->indx == indx) return head->current; @@ -468,28 +597,35 @@ bitmap_find_bit (bitmap head, unsigned int bit) return element; } -/* Clear a single bit in a bitmap. */ +/* Clear a single bit in a bitmap. Return true if the bit changed. */ -void +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 % BITMAP_WORD_BITS; unsigned word_num = bit / BITMAP_WORD_BITS % BITMAP_ELEMENT_WORDS; - ptr->bits[word_num] &= ~ (((BITMAP_WORD) 1) << bit_num); + 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 (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 +bool bitmap_set_bit (bitmap head, int bit) { bitmap_element *ptr = bitmap_find_bit (head, bit); @@ -503,9 +639,15 @@ bitmap_set_bit (bitmap head, int bit) 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. */ @@ -529,7 +671,7 @@ bitmap_bit_p (bitmap head, int bit) #if GCC_VERSION < 3400 /* Table of number of set bits in a character, indexed by value of char. */ -static unsigned char popcount_table[] = +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, @@ -556,10 +698,10 @@ bitmap_popcount (BITMAP_WORD a) /* Count the number of bits set in the bitmap, and return it. */ unsigned long -bitmap_count_bits (bitmap a) +bitmap_count_bits (const_bitmap a) { unsigned long count = 0; - bitmap_element *elt; + const bitmap_element *elt; unsigned ix; for (elt = a->first; elt; elt = elt->next) @@ -578,15 +720,49 @@ bitmap_count_bits (bitmap a) return count; } +/* Return true if the bitmap has a single bit set. Otherwise return + false. */ + +bool +bitmap_single_bit_set_p (const_bitmap a) +{ + unsigned long count = 0; + const bitmap_element *elt; + unsigned ix; + + if (bitmap_empty_p (a)) + return false; + + 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; + + 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 + count += bitmap_popcount (elt->bits[ix]); +#endif + if (count > 1) + return false; + } + + 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 (bitmap a) +bitmap_first_set_bit (const_bitmap a) { - bitmap_element *elt = a->first; + const bitmap_element *elt = a->first; unsigned bit_no; BITMAP_WORD word; unsigned ix; @@ -635,11 +811,11 @@ bitmap_first_set_bit (bitmap a) /* DST = A & B. */ void -bitmap_and (bitmap dst, bitmap a, bitmap b) +bitmap_and (bitmap dst, const_bitmap a, const_bitmap b) { bitmap_element *dst_elt = dst->first; - bitmap_element *a_elt = a->first; - bitmap_element *b_elt = b->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); @@ -682,6 +858,8 @@ bitmap_and (bitmap dst, bitmap a, bitmap b) b_elt = b_elt->next; } } + /* Ensure that dst->current is valid. */ + dst->current = dst->first; bitmap_elt_clear_from (dst, dst_elt); gcc_assert (!dst->current == !dst->first); if (dst->current) @@ -691,10 +869,10 @@ bitmap_and (bitmap dst, bitmap a, bitmap b) /* A &= B. */ void -bitmap_and_into (bitmap a, bitmap b) +bitmap_and_into (bitmap a, const_bitmap b) { bitmap_element *a_elt = a->first; - bitmap_element *b_elt = b->first; + const bitmap_element *b_elt = b->first; bitmap_element *next; if (a == b) @@ -735,79 +913,160 @@ bitmap_and_into (bitmap a, bitmap b) gcc_assert (!a->current || a->indx == a->current->indx); } + +/* 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 = 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 */ -void -bitmap_and_compl (bitmap dst, bitmap a, bitmap b) +bool +bitmap_and_compl (bitmap dst, const_bitmap a, const_bitmap b) { bitmap_element *dst_elt = dst->first; - bitmap_element *a_elt = a->first; - bitmap_element *b_elt = b->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; + return changed; } while (a_elt) { - if (!b_elt || a_elt->indx < b_elt->indx) + while (b_elt && b_elt->indx < a_elt->indx) + b_elt = b_elt->next; + + if (!b_elt || b_elt->indx > a_elt->indx) { - /* Copy a_elt. */ - if (!dst_elt) - dst_elt = bitmap_elt_insert_after (dst, dst_prev, a_elt->indx); - else - dst_elt->indx = a_elt->indx; - memcpy (dst_elt->bits, a_elt->bits, sizeof (dst_elt->bits)); - dst_prev = dst_elt; - dst_elt = dst_elt->next; + 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 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); + if (!changed && dst_elt && dst_elt->indx == a_elt->indx) + { + for (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 - dst_elt->indx = a_elt->indx; - for (ix = BITMAP_ELEMENT_WORDS; ix--;) { - BITMAP_WORD r = a_elt->bits[ix] & ~b_elt->bits[ix]; + 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; + } - dst_elt->bits[ix] = r; - ior |= r; + for (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_elt; - dst_elt = dst_elt->next; + 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; } } - bitmap_elt_clear_from (dst, dst_elt); + + /* Ensure that dst->current is valid. */ + dst->current = dst->first; + + if (dst_elt) + { + changed = true; + bitmap_elt_clear_from (dst, dst_elt); + } gcc_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, bitmap b) +bitmap_and_compl_into (bitmap a, const_bitmap b) { bitmap_element *a_elt = a->first; - bitmap_element *b_elt = b->first; + const bitmap_element *b_elt = b->first; bitmap_element *next; BITMAP_WORD changed = 0; @@ -855,15 +1114,120 @@ bitmap_and_compl_into (bitmap a, bitmap b) 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_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 = start / BITMAP_ELEMENT_ALL_BITS; - unsigned int end_bit_plus1 = start + count; - unsigned int end_bit = end_bit_plus1 - 1; - unsigned int last_index = (end_bit) / BITMAP_ELEMENT_ALL_BITS; - bitmap_element *elt = bitmap_find_bit (head, start); + 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 @@ -951,8 +1315,9 @@ bitmap_clear_range (bitmap head, unsigned int start, unsigned int count) else { elt->bits[first_word_to_mod] &= ~first_mask; - for (i = first_word_to_mod + 1; i < last_word_to_mod; i++) - elt->bits[i] = 0; + 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++) @@ -978,10 +1343,10 @@ bitmap_clear_range (bitmap head, unsigned int start, unsigned int count) /* A = ~A & B. */ void -bitmap_compl_and_into (bitmap a, bitmap b) +bitmap_compl_and_into (bitmap a, const_bitmap b) { bitmap_element *a_elt = a->first; - bitmap_element *b_elt = b->first; + const bitmap_element *b_elt = b->first; bitmap_element *a_prev = NULL; bitmap_element *next; @@ -1044,98 +1409,100 @@ bitmap_compl_and_into (bitmap a, bitmap b) return; } -/* DST = A | B. Return true if DST changes. */ -bool -bitmap_ior (bitmap dst, bitmap a, bitmap b) -{ - bitmap_element *dst_elt = dst->first; - bitmap_element *a_elt = a->first; - bitmap_element *b_elt = b->first; - bitmap_element *dst_prev = NULL; - bool changed = false; +/* 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. */ - gcc_assert (dst != a && dst != b); +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); - while (a_elt || b_elt) + if (a_elt && b_elt && a_elt->indx == b_elt->indx) { - if (a_elt && b_elt && a_elt->indx == b_elt->indx) - { - /* Matching elts, generate A | B. */ - unsigned ix; + /* Matching elts, generate A | B. */ + unsigned ix; - if (!changed && dst_elt && dst_elt->indx == a_elt->indx) - { - for (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 + if (!changed && dst_elt && dst_elt->indx == a_elt->indx) + { + for (ix = BITMAP_ELEMENT_WORDS; ix--;) { - 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 = BITMAP_ELEMENT_WORDS; ix--;) + BITMAP_WORD r = a_elt->bits[ix] | b_elt->bits[ix]; + if (r != dst_elt->bits[ix]) { - BITMAP_WORD r = a_elt->bits[ix] | b_elt->bits[ix]; - dst_elt->bits[ix] = r; + changed = true; } } - a_elt = a_elt->next; - b_elt = b_elt->next; - dst_prev = dst_elt; - dst_elt = dst_elt->next; } else { - /* Copy a single element. */ - bitmap_element *src; - - if (!b_elt || (a_elt && a_elt->indx < b_elt->indx)) - { - src = a_elt; - a_elt = a_elt->next; - } + 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 = BITMAP_ELEMENT_WORDS; ix--;) { - src = b_elt; - b_elt = b_elt->next; + 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 (!changed && dst_elt && dst_elt->indx == src->indx) - { - unsigned ix; + if (!b_elt || (a_elt && a_elt->indx < b_elt->indx)) + src = a_elt; + else + src = b_elt; - for (ix = BITMAP_ELEMENT_WORDS; ix--;) - if (src->bits[ix] != dst_elt->bits[ix]) - { - dst_elt->bits[ix] = src->bits[ix]; - changed = true; - } - } - else - { - changed = true; - 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)); - } + gcc_assert (src); + changed = bitmap_elt_copy (dst, dst_elt, dst_prev, src, changed); + } + return changed; +} - dst_prev = dst_elt; - dst_elt = dst_elt->next; + +/* 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) @@ -1152,11 +1519,12 @@ bitmap_ior (bitmap dst, bitmap a, bitmap b) /* A |= B. Return true if A changes. */ bool -bitmap_ior_into (bitmap a, bitmap b) +bitmap_ior_into (bitmap a, const_bitmap b) { bitmap_element *a_elt = a->first; - bitmap_element *b_elt = b->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) @@ -1164,48 +1532,23 @@ bitmap_ior_into (bitmap a, bitmap b) while (b_elt) { - if (!a_elt || b_elt->indx < a_elt->indx) + /* If A lags behind B, just advance it. */ + if (!a_elt || a_elt->indx == b_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; + changed = bitmap_elt_ior (a, a_elt, a_prev, a_elt, b_elt, changed); b_elt = b_elt->next; - changed = true; - } - else if (a_elt->indx < b_elt->indx) - { - a_prev = a_elt; - a_elt = a_elt->next; } - else + else if (a_elt->indx > b_elt->indx) { - /* Matching elts, generate A |= B. */ - unsigned ix; - - if (changed) - for (ix = BITMAP_ELEMENT_WORDS; ix--;) - { - BITMAP_WORD r = a_elt->bits[ix] | b_elt->bits[ix]; - - a_elt->bits[ix] = r; - } - else - for (ix = BITMAP_ELEMENT_WORDS; ix--;) - { - BITMAP_WORD r = a_elt->bits[ix] | b_elt->bits[ix]; - - if (a_elt->bits[ix] != r) - { - changed = true; - a_elt->bits[ix] = r; - } - } + changed = bitmap_elt_copy (a, NULL, a_prev, b_elt, changed); b_elt = b_elt->next; - a_prev = a_elt; - a_elt = a_elt->next; } + + a_prev = *a_prev_pnext; + a_prev_pnext = &a_prev->next; + a_elt = *a_prev_pnext; } + gcc_assert (!a->current == !a->first); if (a->current) a->indx = a->current->indx; @@ -1215,11 +1558,11 @@ bitmap_ior_into (bitmap a, bitmap b) /* DST = A ^ B */ void -bitmap_xor (bitmap dst, bitmap a, bitmap b) +bitmap_xor (bitmap dst, const_bitmap a, const_bitmap b) { bitmap_element *dst_elt = dst->first; - bitmap_element *a_elt = a->first; - bitmap_element *b_elt = b->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); @@ -1259,7 +1602,7 @@ bitmap_xor (bitmap dst, bitmap a, bitmap b) else { /* Copy a single element. */ - bitmap_element *src; + const bitmap_element *src; if (!b_elt || (a_elt && a_elt->indx < b_elt->indx)) { @@ -1281,6 +1624,8 @@ bitmap_xor (bitmap dst, bitmap a, bitmap b) dst_elt = dst_elt->next; } } + /* Ensure that dst->current is valid. */ + dst->current = dst->first; bitmap_elt_clear_from (dst, dst_elt); gcc_assert (!dst->current == !dst->first); if (dst->current) @@ -1290,10 +1635,10 @@ bitmap_xor (bitmap dst, bitmap a, bitmap b) /* A ^= B */ void -bitmap_xor_into (bitmap a, bitmap b) +bitmap_xor_into (bitmap a, const_bitmap b) { bitmap_element *a_elt = a->first; - bitmap_element *b_elt = b->first; + const bitmap_element *b_elt = b->first; bitmap_element *a_prev = NULL; if (a == b) @@ -1349,10 +1694,10 @@ bitmap_xor_into (bitmap a, bitmap b) occurs in practice. */ bool -bitmap_equal_p (bitmap a, bitmap b) +bitmap_equal_p (const_bitmap a, const_bitmap b) { - bitmap_element *a_elt; - bitmap_element *b_elt; + const bitmap_element *a_elt; + const bitmap_element *b_elt; unsigned ix; for (a_elt = a->first, b_elt = b->first; @@ -1371,10 +1716,10 @@ bitmap_equal_p (bitmap a, bitmap b) /* Return true if A AND B is not empty. */ bool -bitmap_intersect_p (bitmap a, bitmap b) +bitmap_intersect_p (const_bitmap a, const_bitmap b) { - bitmap_element *a_elt; - bitmap_element *b_elt; + const bitmap_element *a_elt; + const bitmap_element *b_elt; unsigned ix; for (a_elt = a->first, b_elt = b->first; @@ -1399,10 +1744,10 @@ bitmap_intersect_p (bitmap a, bitmap b) /* Return true if A AND NOT B is not empty. */ bool -bitmap_intersect_compl_p (bitmap a, bitmap b) +bitmap_intersect_compl_p (const_bitmap a, const_bitmap b) { - bitmap_element *a_elt; - bitmap_element *b_elt; + 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;) @@ -1427,15 +1772,103 @@ bitmap_intersect_compl_p (bitmap a, bitmap b) /* DST = A | (FROM1 & ~FROM2). Return true if DST changes. */ bool -bitmap_ior_and_compl (bitmap dst, bitmap a, bitmap from1, bitmap from2) +bitmap_ior_and_compl (bitmap dst, const_bitmap a, const_bitmap b, const_bitmap kill) { - bitmap_head tmp; - bool changed; + bool changed = false; - bitmap_initialize (&tmp, &bitmap_default_obstack); - bitmap_and_compl (&tmp, from1, from2); - changed = bitmap_ior (dst, a, &tmp); - bitmap_clear (&tmp); + 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 = 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_assert (!dst->current == !dst->first); + if (dst->current) + dst->indx = dst->current->indx; return changed; } @@ -1443,7 +1876,7 @@ bitmap_ior_and_compl (bitmap dst, bitmap a, bitmap from1, bitmap from2) /* A |= (FROM1 & ~FROM2). Return true if A changes. */ bool -bitmap_ior_and_compl_into (bitmap a, bitmap from1, bitmap from2) +bitmap_ior_and_compl_into (bitmap a, const_bitmap from1, const_bitmap from2) { bitmap_head tmp; bool changed; @@ -1455,13 +1888,14 @@ bitmap_ior_and_compl_into (bitmap a, bitmap from1, bitmap from2) return changed; } + /* Debugging function to print out the contents of a bitmap. */ void -debug_bitmap_file (FILE *file, bitmap head) +debug_bitmap_file (FILE *file, const_bitmap head) { - bitmap_element *ptr; + const bitmap_element *ptr; fprintf (file, "\nfirst = %p current = %p indx = %u\n", (void *) head->first, (void *) head->current, head->indx); @@ -1471,7 +1905,8 @@ debug_bitmap_file (FILE *file, bitmap head) unsigned int i, j, col = 26; fprintf (file, "\t%p next = %p prev = %p indx = %u\n\t\tbits = {", - (void*) ptr, (void*) ptr->next, (void*) ptr->prev, ptr->indx); + (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++) @@ -1496,7 +1931,7 @@ debug_bitmap_file (FILE *file, bitmap head) of a bitmap. */ void -debug_bitmap (bitmap head) +debug_bitmap (const_bitmap head) { debug_bitmap_file (stdout, head); } @@ -1505,7 +1940,7 @@ debug_bitmap (bitmap head) it does not print anything but the bits. */ void -bitmap_print (FILE *file, bitmap head, const char *prefix, const char *suffix) +bitmap_print (FILE *file, const_bitmap head, const char *prefix, const char *suffix) { const char *comma = ""; unsigned i; @@ -1519,5 +1954,80 @@ bitmap_print (FILE *file, bitmap head, const char *prefix, const char *suffix) } fputs (suffix, file); } +#ifdef GATHER_STATISTICS + + +/* Used to accumulate statistics about bitmap sizes. */ +struct output_info +{ + int count; + int size; +}; + +/* 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 %6d %10d %10d %10d %10d\n", s, + d->created, d->allocated, d->peak, d->current, d->nsearches); + i->size += d->allocated; + i->count += d->created; + } + return 1; +} +#endif +/* Output per-bitmap memory usage statistics. */ +void +dump_bitmap_statistics (void) +{ +#ifdef GATHER_STATISTICS + struct output_info info; + + if (!bitmap_desc_hash) + return; + + fprintf (stderr, "\nBitmap Overall " + "Allocated Peak Leak searched " + " per search\n"); + fprintf (stderr, "---------------------------------------------------------------------------------\n"); + info.count = 0; + info.size = 0; + htab_traverse (bitmap_desc_hash, print_statistics, &info); + fprintf (stderr, "---------------------------------------------------------------------------------\n"); + fprintf (stderr, "%-40s %7d %10d\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) + { + hash ^= ptr->indx; + for (ix = 0; ix != BITMAP_ELEMENT_WORDS; ix++) + hash ^= ptr->bits[ix]; + } + return (hashval_t)hash; +} #include "gt-bitmap.h"