diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e378c87d73d..c448f0fedcf 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,8 @@
 Sat Nov 27 08:38:26 1999  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>
 
+	* expr.c (store_constructor): Use EXACT_DIV_EXPR when dividend is
+	known to be multiple of divisor.
+
 	* expr.c (store_constructor): Don't clobber TARGET if CLEARED.
 
 	* combine.c (try_combine): Add code to try to merge a set of a
diff --git a/gcc/expr.c b/gcc/expr.c
index 5fc55e52572..4f9f439b88a 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -4185,7 +4185,7 @@ store_constructor (exp, target, align, cleared)
 		offset = build (WITH_RECORD_EXPR, sizetype,
 				offset, make_tree (TREE_TYPE (exp), target));
 
-	      offset = size_binop (FLOOR_DIV_EXPR, offset,
+	      offset = size_binop (EXACT_DIV_EXPR, offset,
 				   size_int (BITS_PER_UNIT));
 
 	      offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, 0);