bb-reorder.c (fixup_reorder_chain): Don't look up new block again.

        * bb-reorder.c (fixup_reorder_chain): Don't look up new block again.
        (reorder_basic_blocks): If no epilogue in rtl, force last block last.

From-SVN: r33221

gcc/ChangeLog

+2000-04-17  Richard Henderson  <rth@cygnus.com>
+
+	* bb-reorder.c (fixup_reorder_chain): Don't look up new block again.
+	(reorder_basic_blocks): If no epilogue in rtl, force last block last.
+
 2000-04-17  Mark Mitchell  <mark@codesourcery.com>
 
 	* function.c (expand_function_start): Use hard_function_value to

gcc/bb-reorder.c

@@ -690,8 +690,7 @@ fixup_reorder_chain ()
 	      BASIC_BLOCK (nb->index)->local_set = 0;
 
 	      nb->aux = xcalloc (1, sizeof (struct reorder_block_def));
-	      REORDER_BLOCK_INDEX (BASIC_BLOCK (n_basic_blocks - 1))
-		= REORDER_BLOCK_INDEX (bbi) + 1;
+	      REORDER_BLOCK_INDEX (nb) = REORDER_BLOCK_INDEX (bbi) + 1;
 	      /* Relink to new block.  */
 	      nb->succ = bbi->succ;
 	      nb->succ->src = nb;
@@ -836,6 +835,22 @@ reorder_basic_blocks ()
 	}
     }
 
+  /* If we've not got epilogue in RTL, we must fallthru to the exit.
+     Force the last block to be at the end.  */
+  /* ??? Some ABIs (e.g. MIPS) require the return insn to be at the
+     end of the function for stack unwinding purposes.  */
+
+#ifndef HAVE_epilogue
+#define HAVE_epilogue 0
+#endif
+
+  if (! HAVE_epilogue)
+    {
+      basic_block last = BASIC_BLOCK (n_basic_blocks - 1);
+      REORDER_BLOCK_INDEX (last) = n_basic_blocks - 1;
+      REORDER_BLOCK_FLAGS (last) |= REORDER_BLOCK_VISITED;
+    }
+      
   make_reorder_chain (BASIC_BLOCK (0));
 
   fixup_reorder_chain ();