tree-ssa-live.c (remove_unused_scope_block_p): Don't remove DECL_IGNORED_P…

tree-ssa-live.c (remove_unused_scope_block_p): Don't remove DECL_IGNORED_P non-reg vars if they are used.

	* tree-ssa-live.c (remove_unused_scope_block_p): Don't remove
	DECL_IGNORED_P non-reg vars if they are used.

From-SVN: r169083

gcc/ChangeLog

+2011-01-21  Jakub Jelinek  <jakub@redhat.com>
+
+	* tree-ssa-live.c (remove_unused_scope_block_p): Don't remove
+	DECL_IGNORED_P non-reg vars if they are used.
+
 2011-01-21  Kai Tietz  <kai.tietz@onevision.com>
 
 	PR bootstrap/47215

gcc/tree-ssa-live.c

@@ -453,8 +453,11 @@ remove_unused_scope_block_p (tree scope)
       else if (TREE_CODE (*t) == VAR_DECL && DECL_HAS_VALUE_EXPR_P (*t))
 	unused = false;
 
-      /* Remove everything we don't generate debug info for.  */
-      else if (DECL_IGNORED_P (*t))
+      /* Remove everything we don't generate debug info for.
+	 Don't remove larger vars though, because BLOCK_VARS are
+	 used also during expansion to determine which variables
+	 might share stack space.  */
+      else if (DECL_IGNORED_P (*t) && is_gimple_reg (*t))
 	{
 	  *t = DECL_CHAIN (*t);
 	  next = t;