mn10200.c (expand_prologue): Create REG_MAYBE_DEAD notes as appropriate.

        * mn10200.c (expand_prologue): Create REG_MAYBE_DEAD notes
        as appropriate.

From-SVN: r55373

gcc/ChangeLog

@@ -4,6 +4,9 @@ Wed Jul 10 18:48:55 CEST 2002  Jan Hubicka  <jh@suse.cz>
 
 2002-07-10  Jeffrey A Law  <law@redhat.com>
 
+	* mn10200.c (expand_prologue): Create REG_MAYBE_DEAD notes
+	as appropriate.
+
         * mn10200.c (expand_epilogue): Fix test to determine which scratch
         register to use.
 

gcc/config/mn10200/mn10200.c

@@ -690,13 +690,23 @@ expand_prologue ()
     }
 
   /* Now put the static chain back where the rest of the function
-     expects to find it.  */
+     expects to find it. 
+
+     Note that we may eliminate all references to this later, so we
+     mark the static chain as maybe dead.  */
   if (current_function_needs_context)
     {
-      emit_move_insn (gen_rtx_REG (PSImode, STATIC_CHAIN_REGNUM),
-		      gen_rtx (MEM, PSImode,
-			       gen_rtx_PLUS (PSImode, stack_pointer_rtx,
-					     GEN_INT (size))));
+      rtx insn;
+
+      insn = emit_move_insn (gen_rtx_REG (PSImode, STATIC_CHAIN_REGNUM),
+			     gen_rtx (MEM, PSImode,
+				      gen_rtx_PLUS (PSImode,
+						    stack_pointer_rtx,
+						    GEN_INT (size))));
+      REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_MAYBE_DEAD,
+                                            const0_rtx,
+                                            REG_NOTES (insn));
+  
     }
 }