diff --git a/lib/float/common.sail b/lib/float/common.sail
index 47311231c..aac734da5 100644
--- a/lib/float/common.sail
+++ b/lib/float/common.sail
@@ -66,6 +66,9 @@ function float_decompose(op) = {
   }
 }
 
+val      float_compose : forall 'n, 'n in { 16, 32, 64, 128 }. float_bits('n) -> bits('n)
+function float_compose(op) = op.sign @ op.exp @ op.mantissa
+
 val      not : forall ('p : Bool). bool('p) -> bool(not('p))
 function not(b) = not_bool(b)