1 files changed, 25 insertions, 0 deletions
diff --git a/testsuite/gna/bug029/fft.vhdl b/testsuite/gna/bug029/fft.vhdl
new file mode 100644
index 000000000..704de1c7e
--- /dev/null
+++ b/testsuite/gna/bug029/fft.vhdl
@@ -0,0 +1,25 @@
+package fft_package is
+  TYPE complex IS ARRAY(0 TO 1) OF INTEGER;
+  CONSTANT w0 : complex := (1, 0);  --Pre-computed constants
+  CONSTANT w1 : complex := (0, -1); --Pre-computed constants
+
+  function butterfly(X1, X2 , W : complex )return complex;
+END fft_package;
+
+package body fft_package is
+
+    function butterfly ( X1, X2 , W : complex )return complex is
+      VARIABLE Y1, Y2  : complex;
+
+    BEGIN
+        -- G1 = X1 + W*X2
+        G1:Y1(0) := X1(0) + ((W(0)*X2(0)) - W(1)*X2(1)); -- G1 real
+        Y1(1) := X1(1) + ((W(0)*X2(1)) + W(1)*X2(0)); -- G1 imaginary
+
+        -- G2 = X1 - W*X2
+        Y2(0) := X1(0) - ((W(0)*X2(0)) - W(1)*X2(1)); -- G2 real
+        Y2(1) := X1(1) - ((W(0)*X2(1)) + W(1)*X2(0)); -- G2 imaginary
+         return Y1;
+         return Y2;
+    END butterfly;
+end fft_package;