re PR middle-end/63155 (memory hog)
2018-10-22 Steven Bosscher <steven@gcc.gnu.org> Richard Biener <rguenther@suse.de> * bitmap.h: Update data structure documentation, including a description of bitmap views as either linked-lists or splay trees. (struct bitmap_element_def): Update comments for splay tree bitmaps. (struct bitmap_head_def): Likewise. (bitmap_list_view, bitmap_tree_view): New prototypes. (bitmap_initialize_stat): Initialize a bitmap_head's indx and tree_form fields. (bmp_iter_set_init): Assert the iterated bitmaps are in list form. (bmp_iter_and_init, bmp_iter_and_compl_init): Likewise. * bitmap.c (bitmap_elem_to_freelist): Unregister overhead of a released bitmap element here. (bitmap_element_free): Remove. (bitmap_elt_clear_from): Work on splay tree bitmaps. (bitmap_list_link_element): Renamed from bitmap_element_link. Move this function similar ones such that linked-list bitmap implementation functions are grouped. (bitmap_list_unlink_element): Renamed from bitmap_element_unlink, and moved for grouping. (bitmap_list_insert_element_after): Renamed from bitmap_elt_insert_after, and moved for grouping. (bitmap_list_find_element): New function spliced from bitmap_find_bit. (bitmap_tree_link_left, bitmap_tree_link_right, bitmap_tree_rotate_left, bitmap_tree_rotate_right, bitmap_tree_splay, bitmap_tree_link_element, bitmap_tree_unlink_element, bitmap_tree_find_element): New functions for splay-tree bitmap implementation. (bitmap_element_link, bitmap_element_unlink, bitmap_elt_insert_after): Renamed and moved, see above entries. (bitmap_tree_listify_from): New function to convert part of a splay tree bitmap to a linked-list bitmap. (bitmap_list_view): Convert a splay tree bitmap to linked-list form. (bitmap_tree_view): Convert a linked-list bitmap to splay tree form. (bitmap_find_bit): Remove. (bitmap_clear, bitmap_clear_bit, bitmap_set_bit, bitmap_single_bit_set_p, bitmap_first_set_bit, bitmap_last_set_bit): Handle splay tree bitmaps. (bitmap_copy, bitmap_count_bits, bitmap_and, bitmap_and_into, bitmap_elt_copy, bitmap_and_compl, bitmap_and_compl_into, bitmap_compl_and_into, bitmap_elt_ior, bitmap_ior, bitmap_ior_into, bitmap_xor, bitmap_xor_into, bitmap_equal_p, bitmap_intersect_p, bitmap_intersect_compl_p, bitmap_ior_and_compl, bitmap_ior_and_compl_into, bitmap_set_range, bitmap_clear_range, bitmap_hash): Reject trying to act on splay tree bitmaps. Make corresponding changes to use linked-list specific bitmap_element manipulation functions as applicable for efficiency. (bitmap_tree_to_vec): New function. (debug_bitmap_elt_file): New function split out from ... (debug_bitmap_file): ... here. Handle splay tree bitmaps. (bitmap_print): Likewise. PR tree-optimization/63155 * tree-ssa-propagate.c (ssa_prop_init): Use tree-view for the SSA edge worklists. * tree-ssa-coalesce.c (coalesce_ssa_name): Populate used_in_copies in tree-view. From-SVN: r265390
This commit is contained in:
Steven Bosscher
Richard Biener
parent
ddec5aea56
commit
d1e14d9720
@ -1,6 +1,65 @@
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2018-10-22 Steven Bosscher <steven@gcc.gnu.org>
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Richard Biener <rguenther@suse.de>
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* bitmap.h: Update data structure documentation, including a
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description of bitmap views as either linked-lists or splay trees.
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(struct bitmap_element_def): Update comments for splay tree bitmaps.
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(struct bitmap_head_def): Likewise.
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(bitmap_list_view, bitmap_tree_view): New prototypes.
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(bitmap_initialize_stat): Initialize a bitmap_head's indx and
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tree_form fields.
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(bmp_iter_set_init): Assert the iterated bitmaps are in list form.
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(bmp_iter_and_init, bmp_iter_and_compl_init): Likewise.
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* bitmap.c (bitmap_elem_to_freelist): Unregister overhead of a
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released bitmap element here.
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(bitmap_element_free): Remove.
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(bitmap_elt_clear_from): Work on splay tree bitmaps.
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(bitmap_list_link_element): Renamed from bitmap_element_link. Move
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this function similar ones such that linked-list bitmap implementation
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functions are grouped.
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(bitmap_list_unlink_element): Renamed from bitmap_element_unlink,
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and moved for grouping.
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(bitmap_list_insert_element_after): Renamed from
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bitmap_elt_insert_after, and moved for grouping.
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(bitmap_list_find_element): New function spliced from bitmap_find_bit.
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(bitmap_tree_link_left, bitmap_tree_link_right,
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bitmap_tree_rotate_left, bitmap_tree_rotate_right, bitmap_tree_splay,
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bitmap_tree_link_element, bitmap_tree_unlink_element,
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bitmap_tree_find_element): New functions for splay-tree bitmap
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implementation.
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(bitmap_element_link, bitmap_element_unlink, bitmap_elt_insert_after):
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Renamed and moved, see above entries.
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(bitmap_tree_listify_from): New function to convert part of a splay
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tree bitmap to a linked-list bitmap.
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(bitmap_list_view): Convert a splay tree bitmap to linked-list form.
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(bitmap_tree_view): Convert a linked-list bitmap to splay tree form.
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(bitmap_find_bit): Remove.
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(bitmap_clear, bitmap_clear_bit, bitmap_set_bit,
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bitmap_single_bit_set_p, bitmap_first_set_bit, bitmap_last_set_bit):
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Handle splay tree bitmaps.
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(bitmap_copy, bitmap_count_bits, bitmap_and, bitmap_and_into,
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bitmap_elt_copy, bitmap_and_compl, bitmap_and_compl_into,
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bitmap_compl_and_into, bitmap_elt_ior, bitmap_ior, bitmap_ior_into,
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bitmap_xor, bitmap_xor_into, bitmap_equal_p, bitmap_intersect_p,
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bitmap_intersect_compl_p, bitmap_ior_and_compl,
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bitmap_ior_and_compl_into, bitmap_set_range, bitmap_clear_range,
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bitmap_hash): Reject trying to act on splay tree bitmaps. Make
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corresponding changes to use linked-list specific bitmap_element
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manipulation functions as applicable for efficiency.
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(bitmap_tree_to_vec): New function.
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(debug_bitmap_elt_file): New function split out from ...
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(debug_bitmap_file): ... here. Handle splay tree bitmaps.
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(bitmap_print): Likewise.
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PR tree-optimization/63155
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* tree-ssa-propagate.c (ssa_prop_init): Use tree-view for the
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SSA edge worklists.
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* tree-ssa-coalesce.c (coalesce_ssa_name): Populate used_in_copies
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in tree-view.
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2018-10-22 Martin Liska <mliska@suse.cz>
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PR tree-optimization/87686
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PR tree-optimization/87686
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Revert
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2018-08-29 Martin Liska <mliska@suse.cz>
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1016
gcc/bitmap.c
1016
gcc/bitmap.c
File diff suppressed because it is too large
Load Diff
238
gcc/bitmap.h
238
gcc/bitmap.h
@ -20,16 +20,21 @@ along with GCC; see the file COPYING3. If not see
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#ifndef GCC_BITMAP_H
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#define GCC_BITMAP_H
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/* Implementation of sparse integer sets as a linked list.
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/* Implementation of sparse integer sets as a linked list or tree.
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This sparse set representation is suitable for sparse sets with an
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unknown (a priori) universe. The set is represented as a double-linked
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list of container nodes (struct bitmap_element). Each node consists
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of an index for the first member that could be held in the container,
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a small array of integers that represent the members in the container,
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and pointers to the next and previous element in the linked list. The
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elements in the list are sorted in ascending order, i.e. the head of
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unknown (a priori) universe.
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Sets are represented as double-linked lists of container nodes of
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type "struct bitmap_element" or as a binary trees of the same
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container nodes. Each container node consists of an index for the
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first member that could be held in the container, a small array of
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integers that represent the members in the container, and pointers
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to the next and previous element in the linked list, or left and
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right children in the tree. In linked-list form, the container
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nodes in the list are sorted in ascending order, i.e. the head of
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the list holds the element with the smallest member of the set.
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In tree form, nodes to the left have a smaller container index.
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For a given member I in the set:
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- the element for I will have index is I / (bits per element)
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@ -42,34 +47,97 @@ along with GCC; see the file COPYING3. If not see
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high storage overhead *per element*, but a small overall overhead if
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the set is very sparse.
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The downside is that many operations are relatively slow because the
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linked list has to be traversed to test membership (i.e. member_p/
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add_member/remove_member). To improve the performance of this set
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representation, the last accessed element and its index are cached.
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For membership tests on members close to recently accessed members,
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the cached last element improves membership test to a constant-time
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operation.
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The storage requirements for linked-list sparse sets are O(E), with E->N
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in the worst case (a sparse set with large distances between the values
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of the set members).
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The following operations can always be performed in O(1) time:
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This representation also works well for data flow problems where the size
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of the set may grow dynamically, but care must be taken that the member_p,
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add_member, and remove_member operations occur with a suitable access
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pattern.
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The linked-list set representation works well for problems involving very
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sparse sets. The canonical example in GCC is, of course, the "set of
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sets" for some CFG-based data flow problems (liveness analysis, dominance
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frontiers, etc.).
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For random-access sparse sets of unknown universe, the binary tree
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representation is likely to be a more suitable choice. Theoretical
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access times for the binary tree representation are better than those
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for the linked-list, but in practice this is only true for truely
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random access.
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Often the most suitable representation during construction of the set
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is not the best choice for the usage of the set. For such cases, the
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"view" of the set can be changed from one representation to the other.
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This is an O(E) operation:
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* from list to tree view : bitmap_tree_view
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* from tree to list view : bitmap_list_view
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Traversing linked lists or trees can be cache-unfriendly. Performance
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can be improved by keeping container nodes in the set grouped together
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in memory, using a dedicated obstack for a set (or group of related
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sets). Elements allocated on obstacks are released to a free-list and
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taken off the free list. If multiple sets are allocated on the same
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obstack, elements freed from one set may be re-used for one of the other
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sets. This usually helps avoid cache misses.
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A single free-list is used for all sets allocated in GGC space. This is
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bad for persistent sets, so persistent sets should be allocated on an
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obstack whenever possible.
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For random-access sets with a known, relatively small universe size, the
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SparseSet or simple bitmap representations may be more efficient than a
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linked-list set.
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LINKED LIST FORM
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================
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In linked-list form, in-order iterations of the set can be executed
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efficiently. The downside is that many random-access operations are
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relatively slow, because the linked list has to be traversed to test
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membership (i.e. member_p/ add_member/remove_member).
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To improve the performance of this set representation, the last
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accessed element and its index are cached. For membership tests on
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members close to recently accessed members, the cached last element
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improves membership test to a constant-time operation.
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The following operations can always be performed in O(1) time in
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list view:
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* clear : bitmap_clear
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* smallest_member : bitmap_first_set_bit
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* choose_one : (not implemented, but could be
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implemented in constant time)
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in constant time)
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The following operations can be performed in O(E) time worst-case (with
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E the number of elements in the linked list), but in O(1) time with a
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suitable access patterns:
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The following operations can be performed in O(E) time worst-case in
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list view (with E the number of elements in the linked list), but in
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O(1) time with a suitable access patterns:
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* member_p : bitmap_bit_p
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* add_member : bitmap_set_bit
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* remove_member : bitmap_clear_bit
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* add_member : bitmap_set_bit / bitmap_set_range
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* remove_member : bitmap_clear_bit / bitmap_clear_range
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The following operations can be performed in O(E) time:
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The following operations can be performed in O(E) time in list view:
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* cardinality : bitmap_count_bits
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* set_size : bitmap_last_set_bit (but this could
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* largest_member : bitmap_last_set_bit (but this could
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in constant time with a pointer to
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the last element in the chain)
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* set_size : bitmap_last_set_bit
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In tree view the following operations can all be performed in O(log E)
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amortized time with O(E) worst-case behavior.
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* smallest_member
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* largest_member
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* set_size
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* member_p
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* add_member
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* remove_member
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Additionally, the linked-list sparse set representation supports
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enumeration of the members in O(E) time:
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@ -93,39 +161,53 @@ along with GCC; see the file COPYING3. If not see
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* A | (B & ~C) : bitmap_ior_and_compl /
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bitmap_ior_and_compl_into
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The storage requirements for linked-list sparse sets are O(E), with E->N
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in the worst case (a sparse set with large distances between the values
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of the set members).
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The linked-list set representation works well for problems involving very
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sparse sets. The canonical example in GCC is, of course, the "set of
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sets" for some CFG-based data flow problems (liveness analysis, dominance
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frontiers, etc.).
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This representation also works well for data flow problems where the size
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of the set may grow dynamically, but care must be taken that the member_p,
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add_member, and remove_member operations occur with a suitable access
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pattern.
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For random-access sets with a known, relatively small universe size, the
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SparseSet or simple bitmap representations may be more efficient than a
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linked-list set. For random-access sets of unknown universe, a hash table
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or a balanced binary tree representation is likely to be a more suitable
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choice.
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BINARY TREE FORM
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================
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An alternate "view" of a bitmap is its binary tree representation.
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For this representation, splay trees are used because they can be
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implemented using the same data structures as the linked list, with
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no overhead for meta-data (like color, or rank) on the tree nodes.
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Traversing linked lists is usually cache-unfriendly, even with the last
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accessed element cached.
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In binary tree form, random-access to the set is much more efficient
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than for the linked-list representation. Downsides are the high cost
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of clearing the set, and the relatively large number of operations
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necessary to balance the tree. Also, iterating the set members is
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not supported.
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Cache performance can be improved by keeping the elements in the set
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grouped together in memory, using a dedicated obstack for a set (or group
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of related sets). Elements allocated on obstacks are released to a
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free-list and taken off the free list. If multiple sets are allocated on
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the same obstack, elements freed from one set may be re-used for one of
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the other sets. This usually helps avoid cache misses.
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As for the linked-list representation, the last accessed element and
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its index are cached, so that membership tests on the latest accessed
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members is a constant-time operation. Other lookups take O(logE)
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time amortized (but O(E) time worst-case).
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A single free-list is used for all sets allocated in GGC space. This is
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bad for persistent sets, so persistent sets should be allocated on an
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obstack whenever possible. */
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The following operations can always be performed in O(1) time:
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* choose_one : (not implemented, but could be
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implemented in constant time)
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The following operations can be performed in O(logE) time amortized
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but O(E) time worst-case, but in O(1) time if the same element is
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accessed.
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* member_p : bitmap_bit_p
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* add_member : bitmap_set_bit
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* remove_member : bitmap_clear_bit
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The following operations can be performed in O(logE) time amortized
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but O(E) time worst-case:
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* smallest_member : bitmap_first_set_bit
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* largest_member : bitmap_last_set_bit
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* set_size : bitmap_last_set_bit
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The following operations can be performed in O(E) time:
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* clear : bitmap_clear
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The binary tree sparse set representation does *not* support any form
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of enumeration, and does also *not* support logical operations on sets.
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The binary tree representation is only supposed to be used for sets
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on which many random-access membership tests will happen. */
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#include "obstack.h"
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@ -225,24 +307,34 @@ struct GTY (()) bitmap_obstack {
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linear in the number of elements to be freed. */
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struct GTY((chain_next ("%h.next"), chain_prev ("%h.prev"))) bitmap_element {
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struct bitmap_element *next; /* Next element. */
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struct bitmap_element *prev; /* Previous element. */
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unsigned int indx; /* regno/BITMAP_ELEMENT_ALL_BITS. */
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BITMAP_WORD bits[BITMAP_ELEMENT_WORDS]; /* Bits that are set. */
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/* In list form, the next element in the linked list;
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in tree form, the left child node in the tree. */
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struct bitmap_element *next;
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/* In list form, the previous element in the linked list;
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in tree form, the right child node in the tree. */
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struct bitmap_element *prev;
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/* regno/BITMAP_ELEMENT_ALL_BITS. */
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unsigned int indx;
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/* Bits that are set, counting from INDX, inclusive */
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BITMAP_WORD bits[BITMAP_ELEMENT_WORDS];
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};
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/* Head of bitmap linked list. The 'current' member points to something
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already pointed to by the chain started by first, so GTY((skip)) it. */
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struct GTY(()) bitmap_head {
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unsigned int indx; /* Index of last element looked at. */
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unsigned int descriptor_id; /* Unique identifier for the allocation
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site of this bitmap, for detailed
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statistics gathering. */
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bitmap_element *first; /* First element in linked list. */
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bitmap_element * GTY((skip(""))) current; /* Last element looked at. */
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bitmap_obstack *obstack; /* Obstack to allocate elements from.
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If NULL, then use GGC allocation. */
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/* Index of last element looked at. */
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unsigned int indx;
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/* False if the bitmap is in list form; true if the bitmap is in tree form.
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Bitmap iterators only work on bitmaps in list form. */
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bool tree_form;
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/* In list form, the first element in the linked list;
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in tree form, the root of the tree. */
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bitmap_element *first;
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/* Last element looked at. */
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bitmap_element * GTY((skip(""))) current;
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/* Obstack to allocate elements from. If NULL, then use GGC allocation. */
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bitmap_obstack *obstack;
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void dump ();
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};
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@ -250,6 +342,10 @@ struct GTY(()) bitmap_head {
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extern bitmap_element bitmap_zero_bits; /* Zero bitmap element */
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extern bitmap_obstack bitmap_default_obstack; /* Default bitmap obstack */
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/* Change the view of the bitmap to list, or tree. */
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void bitmap_list_view (bitmap);
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void bitmap_tree_view (bitmap);
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/* Clear a bitmap by freeing up the linked list. */
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extern void bitmap_clear (bitmap);
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@ -316,10 +412,10 @@ extern bool bitmap_clear_bit (bitmap, int);
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/* Set a single bit in a bitmap. Return true if the bit changed. */
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extern bool bitmap_set_bit (bitmap, int);
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/* Return true if a register is set in a register set. */
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/* Return true if a bit is set in a bitmap. */
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extern int bitmap_bit_p (bitmap, int);
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/* Debug functions to print a bitmap linked list. */
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/* Debug functions to print a bitmap. */
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extern void debug_bitmap (const_bitmap);
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extern void debug_bitmap_file (FILE *, const_bitmap);
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@ -339,6 +435,7 @@ static inline void
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bitmap_initialize (bitmap head, bitmap_obstack *obstack CXX_MEM_STAT_INFO)
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{
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head->first = head->current = NULL;
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head->indx = head->tree_form = 0;
|
||||
head->obstack = obstack;
|
||||
if (GATHER_STATISTICS)
|
||||
bitmap_register (head PASS_MEM_STAT);
|
||||
@ -398,6 +495,8 @@ bmp_iter_set_init (bitmap_iterator *bi, const_bitmap map,
|
||||
bi->elt1 = map->first;
|
||||
bi->elt2 = NULL;
|
||||
|
||||
gcc_checking_assert (!map->tree_form);
|
||||
|
||||
/* Advance elt1 until it is not before the block containing start_bit. */
|
||||
while (1)
|
||||
{
|
||||
@ -440,6 +539,8 @@ bmp_iter_and_init (bitmap_iterator *bi, const_bitmap map1, const_bitmap map2,
|
||||
bi->elt1 = map1->first;
|
||||
bi->elt2 = map2->first;
|
||||
|
||||
gcc_checking_assert (!map1->tree_form && !map2->tree_form);
|
||||
|
||||
/* Advance elt1 until it is not before the block containing
|
||||
start_bit. */
|
||||
while (1)
|
||||
@ -498,8 +599,7 @@ bmp_iter_and_init (bitmap_iterator *bi, const_bitmap map1, const_bitmap map2,
|
||||
*bit_no = start_bit;
|
||||
}
|
||||
|
||||
/* Initialize an iterator to iterate over the bits in MAP1 & ~MAP2.
|
||||
*/
|
||||
/* Initialize an iterator to iterate over the bits in MAP1 & ~MAP2. */
|
||||
|
||||
static inline void
|
||||
bmp_iter_and_compl_init (bitmap_iterator *bi,
|
||||
@ -509,6 +609,8 @@ bmp_iter_and_compl_init (bitmap_iterator *bi,
|
||||
bi->elt1 = map1->first;
|
||||
bi->elt2 = map2->first;
|
||||
|
||||
gcc_checking_assert (!map1->tree_form && !map2->tree_form);
|
||||
|
||||
/* Advance elt1 until it is not before the block containing start_bit. */
|
||||
while (1)
|
||||
{
|
||||
|
||||
@ -1703,9 +1703,11 @@ coalesce_ssa_name (var_map map)
|
||||
coalesce_list *cl;
|
||||
auto_bitmap used_in_copies;
|
||||
|
||||
bitmap_tree_view (used_in_copies);
|
||||
cl = create_coalesce_list_for_region (map, used_in_copies);
|
||||
if (map->outofssa_p)
|
||||
populate_coalesce_list_for_outofssa (cl, used_in_copies);
|
||||
bitmap_list_view (used_in_copies);
|
||||
|
||||
if (dump_file && (dump_flags & TDF_DETAILS))
|
||||
dump_var_map (dump_file, map);
|
||||
|
||||
@ -381,6 +381,8 @@ ssa_prop_init (void)
|
||||
/* Worklists of SSA edges. */
|
||||
ssa_edge_worklist = BITMAP_ALLOC (NULL);
|
||||
ssa_edge_worklist_back = BITMAP_ALLOC (NULL);
|
||||
bitmap_tree_view (ssa_edge_worklist);
|
||||
bitmap_tree_view (ssa_edge_worklist_back);
|
||||
|
||||
/* Worklist of basic-blocks. */
|
||||
bb_to_cfg_order = XNEWVEC (int, last_basic_block_for_fn (cfun) + 1);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user