regrename.c (scan_rtx_address): Frob action, not class, when trying to disable optimization.

        * regrename.c (scan_rtx_address): Frob action, not class,
        when trying to disable optimization.

From-SVN: r37117

gcc/ChangeLog

+2000-10-28  Richard Henderson  <rth@redhat.com>
+
+	* regrename.c (scan_rtx_address): Frob action, not class,
+	when trying to disable optimization.
+
 2000-10-28  Mark Mitchell  <mark@codesourcery.com>
 
 	* c-semantics.c (make_rtl_for_local_static): Don't clobber

gcc/regrename.c

@@ -475,7 +475,9 @@ scan_rtx_address (insn, loc, class, action, mode)
     case PRE_DEC:
     case PRE_MODIFY:
 #ifndef AUTO_INC_DEC
-      class = NO_REGS;
+      /* If the target doesn't claim to handle autoinc, this must be
+	 something special, like a stack push.  Kill this chain.  */
+      action = terminate_all_read;
 #endif
       break;