tree.h (struct tree_memory_tag): Add aliases member.

2007-01-28  Daniel Berlin  <dberlin@dberlin.org>

	* tree.h (struct tree_memory_tag): Add aliases member.
	(MTAG_ALIASES): New macro.
	* tree-ssa-alias.c (alias_bitmap_obstack): New variable.
	(add_may_alias): Remove pointer-set. Update for may_aliases being
	a bitmap. 
	(mark_aliases_call_clobbered): Update for may_aliases being a
	bitmap.
	(compute_tag_properties): Ditto.
	(create_partition_for): Ditto.
	(compute_memory_partitions): Ditto.
	(dump_may_aliases_for): Ditto.
	(is_aliased_with): Ditto.
	(add_may_alias_for_new_tag): Ditto.
	(rewrite_alias_set_for): Rewrite for may_aliases being a bitmap.
	(compute_is_aliased): New function.
	(compute_may_aliases): Call compute_is_aliased).
	(init_alias_info): Initialize alias_bitmap_obstack.
	(union_alias_set_into): New function.
	(compute_flow_sensitive_aliasing): Use union_aliases_into.
	(have_common_aliases_p): Rewrite to take two bitmaps and use
	intersection.
	(compute_flow_insensitive_aliasing): Stop using pointer-sets.
	Update for bitmaps.
	(finalize_ref_all_pointers): Update for add_may_alias changes.
	(new_type_alias): Ditto.
	* tree-flow-inline.h (may_aliases): Return a bitmap.
	* tree-dfa.c (dump_variable): Check for MTAG_P'ness.
	* tree-ssa.c (verify_flow_insensitive_alias_info): Update for
	may_aliases being a bitmap.
	* tree-flow.h (struct var_ann_d): Remove may_aliases member.
	may_aliases now returns a bitmap.
	* tree-ssa-structalias.c (merge_smts_into): Update for may_aliases
	being a bitmap.
	* tree-ssa-operands.c (add_virtual_operand): Update for
	may_aliases being a bitmap.

From-SVN: r121302

1 files changed, 11 insertions, 8 deletions

diff --git a/gcc/tree-ssa-operands.c b/gcc/tree-ssa-operands.c
index 44e8707..aa56c19 100644
--- a/gcc/tree-ssa-operands.c
+++ b/gcc/tree-ssa-operands.c
@@ -1441,7 +1441,7 @@ add_virtual_operand (tree var, stmt_ann_t s_ann, int flags,
 		     tree full_ref, HOST_WIDE_INT offset,
 		     HOST_WIDE_INT size, bool for_clobber)
 {
-  VEC(tree,gc) *aliases;
+  bitmap aliases = NULL;
   tree sym;
   var_ann_t v_ann;
   
@@ -1479,7 +1479,8 @@ add_virtual_operand (tree var, stmt_ann_t s_ann, int flags,
   if (flags & opf_no_vops)
     return;
   
-  aliases = v_ann->may_aliases;
+  if (MTAG_P (var))
+    aliases = MTAG_ALIASES (var);
   if (aliases == NULL)
     {
       if (s_ann && !gimple_aliases_computed_p (cfun))
@@ -1492,19 +1493,20 @@ add_virtual_operand (tree var, stmt_ann_t s_ann, int flags,
     }
   else
     {
-      unsigned i;
+      bitmap_iterator bi;
+      unsigned int i;
       tree al;
       
       /* The variable is aliased.  Add its aliases to the virtual
 	 operands.  */
-      gcc_assert (VEC_length (tree, aliases) != 0);
+      gcc_assert (!bitmap_empty_p (aliases));
       
       if (flags & opf_def)
 	{
 	  bool none_added = true;
-
-	  for (i = 0; VEC_iterate (tree, aliases, i, al); i++)
+	  EXECUTE_IF_SET_IN_BITMAP (aliases, 0, i, bi)
 	    {
+	      al = referenced_var (i);
 	      if (!access_can_touch_variable (full_ref, al, offset, size))
 		continue;
 	      
@@ -1534,14 +1536,15 @@ add_virtual_operand (tree var, stmt_ann_t s_ann, int flags,
       else
 	{
 	  bool none_added = true;
-	  for (i = 0; VEC_iterate (tree, aliases, i, al); i++)
+	  EXECUTE_IF_SET_IN_BITMAP (aliases, 0, i, bi)
 	    {
+	      al = referenced_var (i);
 	      if (!access_can_touch_variable (full_ref, al, offset, size))
 		continue;
 	      none_added = false;
 	      append_vuse (al);
 	    }
-
+	  
 	  /* Similarly, append a virtual uses for VAR itself, when
 	     it is an alias tag.  */
 	  if (v_ann->is_aliased || none_added)