diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 5e0d6411cc4..60da1459a25 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,6 +1,8 @@
 1999-11-22  Bernd Schmidt  <bernds@cygnus.co.uk>
 
 	* loop.c (load_mems): Reformat slightly.
+	* basic-block.h (regset_head): New typedef.
+	(INIT_REG_SET): New macro.
 
 1999-11-22  Bruce Korb  <autogen@linuxbox.com
 
diff --git a/gcc/basic-block.h b/gcc/basic-block.h
index 072e902c883..499f86ec4de 100644
--- a/gcc/basic-block.h
+++ b/gcc/basic-block.h
@@ -23,7 +23,13 @@ Boston, MA 02111-1307, USA.  */
 #include "sbitmap.h"
 #include "varray.h"
 
-typedef bitmap regset;		/* Head of register set linked list.  */
+/* Head of register set linked list.  */
+typedef bitmap_head regset_head;
+/* A pointer to a regset_head.  */
+typedef bitmap regset;
+
+/* Initialize a new regset.  */
+#define INIT_REG_SET(HEAD) bitmap_initialize (HEAD)
 
 /* Clear a register set by freeing up the linked list.  */
 #define CLEAR_REG_SET(HEAD) bitmap_clear (HEAD)