* tree-ssa-pre.c (do_regular_insertion): Add FIXME markers at points

	of potentially huge memset overhead.
	(do_partial_partial_insertion): Likewise.
	* cfgexpand.c (gimple_expand_cfg): Use XCNEWVEC instead of xcalloc.
	* tree-vrp.c (find_assert_locations): Use XNEWVEC instead of XCNEWVEC
	for arrays to be filled by pre_and_rev_post_order_compute.  Allocate
	the right number of slots, not that number plus NUM_FIXED_BLOCKS.
	* tree-ssa-reassoc.c (init_reassoc): Likewise.
	* cfganal.c (dfs_enumerate_from): Use XNEWVEC instead of XCNEWVEC for
	array used as stack.
	* tree-ssa-sccvn.c (init_scc_vn): Use XNEWVEC instead of XCNEWVEC for
	arrays to be filled by pre_and_rev_post_order_compute.
	* cfgloopmanip.c (find_path): Use XNEWVEC instead of XCNEWVEC for
	array to be filled by dfs_enumerate_from.
	(remove_path): Likewise.
	(duplicate_loop_to_header_edge): Use XNEWVEC instead of XCNEWVEC for
	array of loops that is filled on the next lines.
	* cfgloop.c (get_loop_body): Use XNEWVEC instead of XCNEWVEC for
	array of basic blocks to be returned.
	(get_loop_body_in_dom_order): Likewise.
	(get_loop_body_in_bfs_order): Likewise.
	* tree-ssa-loop-manip.c (loop_renamer_obstack): New static obstack
	for all bitmaps used for rewriting into loop-closed SSA form.
	(add_exit_phis_var): Allocate the def bitmap on it.  Clear the livein
	bitmap at the end to release a lot of memory.
	(add_exit_phis): Allocate the exits bitmap on the new obstack.
	(get_loops_exits): Allocate the exits bitmap on the new obstack.
	(find_uses_to_rename_use): Allocate a use_blocks bitmap if ver is
	seen for the first time.
	(find_uses_to_rename): Add "???" for why the whole function must
	be re-scanned if changed_bbs is empty.
	(rewrite_into_loop_closed_ssa): Allocate bitmaps on the new obstack.
	Use XNEWVEC to allocate the use_blocks array.  Initialize the new
	obstack, and free it at the end.  Remove loop over all SSA names.
	(check_loop_closed_ssa_stmt): Look only at SSA_OP_USE operands.
	* tree-cfg.c (move_sese_region_to_fn): Use XNEWVEC instead of
	xcalloc to allocate edge_pred and edge_flag arrays.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@190359 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 4 insertions, 3 deletions

diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c
index 842c392914d..b7e343be7c3 100644
--- a/gcc/tree-ssa-sccvn.c
+++ b/gcc/tree-ssa-sccvn.c
@@ -3835,13 +3835,14 @@ init_scc_vn (void)
   vn_ssa_aux_table = VEC_alloc (vn_ssa_aux_t, heap, num_ssa_names + 1);
   /* VEC_alloc doesn't actually grow it to the right size, it just
      preallocates the space to do so.  */
-  VEC_safe_grow_cleared (vn_ssa_aux_t, heap, vn_ssa_aux_table, num_ssa_names + 1);
+  VEC_safe_grow_cleared (vn_ssa_aux_t, heap, vn_ssa_aux_table,
+			 num_ssa_names + 1);
   gcc_obstack_init (&vn_ssa_aux_obstack);
 
   shared_lookup_phiargs = NULL;
   shared_lookup_references = NULL;
-  rpo_numbers = XCNEWVEC (int, last_basic_block + NUM_FIXED_BLOCKS);
-  rpo_numbers_temp = XCNEWVEC (int, last_basic_block + NUM_FIXED_BLOCKS);
+  rpo_numbers = XNEWVEC (int, last_basic_block);
+  rpo_numbers_temp = XNEWVEC (int, n_basic_blocks - NUM_FIXED_BLOCKS);
   pre_and_rev_post_order_compute (NULL, rpo_numbers_temp, false);
 
   /* RPO numbers is an array of rpo ordering, rpo[i] = bb means that