1 files changed, 49 insertions, 0 deletions
diff --git a/tests/various/constmsk_testmap.v b/tests/various/constmsk_testmap.v
new file mode 100644
index 000000000..fab1b1bbc
--- /dev/null
+++ b/tests/various/constmsk_testmap.v
@@ -0,0 +1,49 @@
+(* techmap_celltype = "$reduce_or" *)
+module my_opt_reduce_or(...);
+    parameter A_SIGNED = 0;
+    parameter A_WIDTH = 1;
+    parameter Y_WIDTH = 1;
+
+    input [A_WIDTH-1:0] A;
+    output reg [Y_WIDTH-1:0] Y;
+
+    parameter _TECHMAP_CONSTMSK_A_ = 0;
+    parameter _TECHMAP_CONSTVAL_A_ = 0;
+
+    wire _TECHMAP_FAIL_ = count_nonconst_bits() == A_WIDTH;
+    wire [1024:0] _TECHMAP_DO_ = "proc;;";
+
+    function integer count_nonconst_bits;
+        integer i;
+        begin
+            count_nonconst_bits = 0;
+            for (i = 0; i < A_WIDTH; i=i+1)
+                if (!_TECHMAP_CONSTMSK_A_[i])
+                    count_nonconst_bits = count_nonconst_bits+1;
+        end
+    endfunction
+
+    function has_const_one;
+        integer i;
+        begin
+            has_const_one = 0;
+            for (i = 0; i < A_WIDTH; i=i+1)
+                if (_TECHMAP_CONSTMSK_A_[i] && _TECHMAP_CONSTVAL_A_[i] === 1'b1)
+                    has_const_one = 1;
+        end
+    endfunction
+
+    integer i;
+    reg [count_nonconst_bits()-1:0] tmp;
+
+    always @* begin
+        if (has_const_one()) begin
+            Y = 1;
+        end else begin
+            for (i = 0; i < A_WIDTH; i=i+1)
+                if (!_TECHMAP_CONSTMSK_A_[i])
+                    tmp = {A[i], tmp[count_nonconst_bits()-1:1]};
+            Y = |tmp;
+        end
+    end
+endmodule