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diff --git a/testsuite/tests/codeGen/should_run/simd003.hs b/testsuite/tests/codeGen/should_run/simd003.hs
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+++ b/testsuite/tests/codeGen/should_run/simd003.hs
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+{-# OPTIONS_GHC -msse4 #-}
+{-# OPTIONS_GHC -mavx #-}
+{-# LANGUAGE MagicHash #-}
+{-# LANGUAGE UnboxedTuples #-}
+-- !!! test the packing of floats and doubles into a vector
+
+import GHC.Exts
+
+data FloatX4 = FX4# FloatX4#
+
+instance Show FloatX4 where
+  show (FX4# f) = case (unpackFloatX4# f) of
+    (# a, b, c, d #) -> show ((F# a), (F# b), (F# c), (F# d))
+
+data DoubleX2 = DX2# DoubleX2#
+
+instance Show DoubleX2 where
+  show (DX2# d) = case (unpackDoubleX2# d) of
+    (# a, b #) -> show ((D# a), (D# b))
+
+
+main :: IO ()
+main = do
+  print (FX4# (packFloatX4# (# 9.2#, 8.15#, 7.0#, 6.4# #)))
+  print (DX2# (packDoubleX2# (# 7.2##, 9.3## #)))