diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 25bf3ba5d56..e2178788ca7 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2001-09-11  Jim Wilson  <wilson@redhat.com>
+
+	* alias.c (clear_reg_alias_info): Only handle pseudo registers.
+
 2001-10-11  Matt Kraai  <kraai@alumni.carnegiemellon.edu>
 
 	* builtins.c (c_strlen): Treat an offset too large for a
diff --git a/gcc/alias.c b/gcc/alias.c
index 5da7740ad6c..61c1d8fa2ad 100644
--- a/gcc/alias.c
+++ b/gcc/alias.c
@@ -969,8 +969,10 @@ void
 clear_reg_alias_info (reg)
      rtx reg;
 {
-  if (REGNO (reg) < reg_known_value_size)
-    reg_known_value[REGNO (reg)] = reg;
+  unsigned int regno = REGNO (reg);
+
+  if (regno < reg_known_value_size && regno >= FIRST_PSEUDO_REGISTER)
+    reg_known_value[regno] = reg;
 }
 
 /* Returns a canonical version of X, from the point of view alias