re PR c++/6396 (3.1 flow.c 583 ICE with -frename-registers)

	PR c++/6396
	* toplev.c (rest_of_compilation): Only run regrename and copy
	propagation if optimizing.

From-SVN: r52857

gcc/ChangeLog

 2002-04-28  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/6396
+	* toplev.c (rest_of_compilation): Only run regrename and copy
+	propagation if optimizing.
+
+2002-04-28  Jakub Jelinek  <jakub@redhat.com>
+
 	PR optimization/6475
 	* reload1.c (alter_reg): Only call set_mem_expr if I is home pseudo
 	register of REGNO_DECL (i).

gcc/toplev.c

@@ -3223,7 +3223,7 @@ rest_of_compilation (decl)
     }
 #endif
 
-  if (flag_rename_registers || flag_cprop_registers)
+  if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
     {
       timevar_push (TV_RENAME_REGISTERS);
       open_dump_file (DFI_rnreg, decl);