1 files changed, 19 insertions, 0 deletions
diff --git a/testsuite/tests/asmcomp/staticalloc.ml b/testsuite/tests/asmcomp/staticalloc.ml
new file mode 100644
index 0000000000..e21fdee633
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+++ b/testsuite/tests/asmcomp/staticalloc.ml
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+(* Check the effectiveness of structured constant propagation and
+   static allocation.
+
+   Ref: http://caml.inria.fr/mantis/view.php?id=5779
+*)
+
+let () =
+  let x0 = Gc.allocated_bytes () in
+  let x1 = Gc.allocated_bytes () in
+  let pair x y = (x, y) in
+  let a = pair 1 2 in
+  let b = pair a ["x";"y"] in
+  let g () = (a, fst b) in
+  assert (g () == ((1,2), (1,2)));
+  assert (fst (pair a a) == (1, 2));
+  assert (snd b != ["x"; "y"]);  (* mutable "constant", cannot be shared *)
+  let x2 = Gc.allocated_bytes () in
+  assert(x1 -. x0 = x2 -. x1)
+     (* check that we did not allocated anything between x1 and x2 *)