tree.h (tree_memory_tag): Add old_used_alone.

2006-04-08  Daniel Berlin  <dberlin@dberlin.org>

	* tree.h (tree_memory_tag): Add old_used_alone.
	(SMT_OLD_USED_ALONE): New macro.
	* tree-ssa-alias.c (recalculate_used_alone): Stop
	marking things for renaming unnecessarily.

From-SVN: r112789

1 files changed, 6 insertions, 0 deletions

diff --git a/gcc/tree.h b/gcc/tree.h
index 27f4b0f..b3bc004 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -2312,6 +2312,7 @@ struct tree_memory_tag GTY(())
   struct tree_decl_minimal common;
   unsigned int is_global:1;
   unsigned int is_used_alone:1;
+  unsigned int old_used_alone:1;
 };
 
 #define MTAG_GLOBAL(NODE) (TREE_MEMORY_TAG_CHECK (NODE)->mtag.is_global)
@@ -2321,6 +2322,11 @@ struct tree_memory_tag GTY(())
    from it.  */
 #define SMT_USED_ALONE(NODE) (SYMBOL_MEMORY_TAG_CHECK (NODE)->mtag.is_used_alone)
 
+/* This flag is used to temporarily store the old value of the used alone
+   flag when updating so we know whether to mark the symbol for
+   renaming.  */
+#define SMT_OLD_USED_ALONE(NODE) (SYMBOL_MEMORY_TAG_CHECK (NODE)->mtag.old_used_alone)
+
 struct tree_struct_field_tag GTY(())
 {
   struct tree_memory_tag common;