Fix for problem with unnecessary volatile mems.

PR target/13132
* function.c (gen_mem_addressof): When no decl, explicitly clear flag
bits.

From-SVN: r74543

gcc/ChangeLog

+2003-12-11  James E Wilson  <wilson@specifixinc.com>
+
+	PR target/13132
+	* function.c (gen_mem_addressof): When no decl, explicitly clear flag
+	bits.
+
 2003-12-12  Nick Clifton  <nickc@redhat.com>
 
 	* config/m32r/m32r.c: Convert to ISO-C

gcc/function.c

@@ -2868,7 +2868,17 @@ gen_mem_addressof (rtx reg, tree decl, int rescan)
 	fixup_var_refs (reg, GET_MODE (reg), TREE_UNSIGNED (type), reg, 0);
     }
   else if (rescan)
+    {
+      /* This can only happen during reload.  Clear the same flag bits as
+	 reload.  */
+      MEM_VOLATILE_P (reg) = 0;
+      RTX_UNCHANGING_P (reg) = 0;
+      MEM_IN_STRUCT_P (reg) = 0;
+      MEM_SCALAR_P (reg) = 0;
+      MEM_ATTRS (reg) = 0;
+
       fixup_var_refs (reg, GET_MODE (reg), 0, reg, 0);
+    }
 
   return reg;
 }