re PR tree-optimization/22000 (Read from volatile member of struct is optimized away)

	PR 22000
	* tree-ssa-operands.c (get_expr_operands): Check the volatility of
	the FIELD_DECL and set s_ann->has_volatile_ops accordingly.

From-SVN: r101289

gcc/ChangeLog

+2005-06-23  Mark Mitchell  <mark@codesourcery.com>
+
+	PR 22000
+	* tree-ssa-operands.c (get_expr_operands): Check the volatility of
+	the FIELD_DECL and set s_ann->has_volatile_ops accordingly.
+
 2005-06-24  Jan Hubicka  <jh@suse.cz>
 
 	* opts.c (decode_options): Enable unit-at-a-time by default at -O1.

gcc/tree-ssa-operands.c

@@ -1346,7 +1346,11 @@ get_expr_operands (tree stmt, tree *expr_p, int flags)
 			     flags & ~opf_kill_def);
 	
 	if (code == COMPONENT_REF)
+	  {
+	    if (TREE_THIS_VOLATILE (TREE_OPERAND (expr, 1)))
+	      s_ann->has_volatile_ops = true; 
 	    get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none);
+	  }
 	return;
       }
     case WITH_SIZE_EXPR: