From: hubicka <hubicka@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Thu, 3 Mar 2005 19:53:47 +0000 (+0000)
Subject: 	* tree-dfa.c (add_referenced_var): Don't walk initializer of external
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b93ca75c5b1631c9f0ea5770c6408171aa80e695;p=thirdparty%2Fgcc.git

	* tree-dfa.c (add_referenced_var): Don't walk initializer of external
	and non-constant public variables.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@95844 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index ba2e68a1fe66..1b544690f48f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2005-03-03  Jan Hubicka  <jh@suse.cz>
+
+	* tree-dfa.c (add_referenced_var): Don't walk initializer of external
+	and non-constant public variables.
+
 2005-03-03  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* tree-cfg.c (stmt_starts_bb_p): Clean up by replacing code
diff --git a/gcc/tree-dfa.c b/gcc/tree-dfa.c
index b591ffb5e7ed..641bb1b4df44 100644
--- a/gcc/tree-dfa.c
+++ b/gcc/tree-dfa.c
@@ -901,7 +901,14 @@ add_referenced_var (tree var, struct walk_state *walk_state)
       /* Scan DECL_INITIAL for pointer variables as they may contain
 	 address arithmetic referencing the address of other
 	 variables.  */
-      if (DECL_INITIAL (var))
+      if (DECL_INITIAL (var)
+	  /* Initializers of external variables are not useful to the
+	     optimizers.  */
+          && !DECL_EXTERNAL (var)
+	  /* It's not necessary to walk the initial value of non-constant
+	     public variables because it cannot be propagated by the
+	     optimizers. */
+	  && (!TREE_PUBLIC (var) || !TREE_CONSTANT (var)))
       	walk_tree (&DECL_INITIAL (var), find_vars_r, walk_state, 0);
     }
 }