diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index eaf2d3657e04..2fd907d2b69d 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+Sat Nov 24 16:11:00 2001  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>
+
+	* function.c (assign_stack_temp_for_type): Clear alias set before
+	setting new one.
+
 2001-11-23  David Edelsohn  <edelsohn@gnu.org>
 
 	* rs6000.c (print_operand, case 'v'): Use HOST_WIDE_INT_PRINT_HEX
diff --git a/gcc/function.c b/gcc/function.c
index c17a04ae2510..0891dd008f43 100644
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -787,6 +787,7 @@ assign_stack_temp_for_type (mode, size, keep, type)
   MEM_IN_STRUCT_P (p->slot) = 0;
   MEM_SCALAR_P (p->slot) = 0;
   MEM_VOLATILE_P (p->slot) = 0;
+  set_mem_alias_set (p->slot, 0);
 
   /* If we know the alias set for the memory that will be used, use
      it.  If there's no TYPE, then we don't know anything about the