1 files changed, 43 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/gnat.dg/opt31.adb b/gcc-4.9/gcc/testsuite/gnat.dg/opt31.adb
new file mode 100644
index 000000000..51aa3556c
--- /dev/null
+++ b/gcc-4.9/gcc/testsuite/gnat.dg/opt31.adb
@@ -0,0 +1,43 @@
+-- { dg-do run }
+-- { dg-options "-O" }
+
+with Interfaces; use Interfaces;
+with Unchecked_Conversion;
+
+procedure Opt31 is
+
+  type Unsigned_24 is new Unsigned_32 range 0 .. 2**24 - 1;
+  subtype Time_T is Unsigned_24 range 0 .. 24 * 60 * 60 * 128 - 1;
+
+  type Messages_T is array (Positive range <>) of Unsigned_8;
+  subtype T_3Bytes is Messages_T (1 .. 3);
+
+  type Rec1 is record
+    F : Time_T;
+  end record;
+  for Rec1 use record
+    F at 0 range 0 .. 23;
+  end record;
+  for Rec1'Size use 24;
+
+  type Rec2 is record
+    I1,I2,I3,I4 : Integer;
+    R1 : Rec1;
+  end record;
+
+  function Conv is new Unchecked_Conversion (T_3Bytes, Rec1);
+
+  procedure Decode (M : Messages_T) is
+    My_Rec2 : Rec2;
+  begin
+    My_Rec2.R1 := Conv (M (1 .. 3));
+    if not My_Rec2.R1.F'Valid then
+      raise Program_Error;
+    end if;
+  end;
+
+  Message : Messages_T (1 .. 4) := (16#18#, 16#0C#, 16#0C#, 16#18#);
+
+begin
+  Decode (Message);
+end;