Add regression test for automatic event control repeat counts

Check that the repeat count expression of a non-blocking intra-assignment
event control can reference an automatic task argument. The repeat count is
evaluated when the assignment is scheduled, so the automatic variable is not
referenced after the task scope is freed.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>

ivtest/ivltests/nb_ec_repeat_auto.v

@@ -0,0 +1,46 @@
+// Check that non-blocking event control repeat counts can use automatic terms.
+
+module test;
+
+  reg clk;
+  reg failed;
+  reg [3:0] result;
+
+  `define check(val, exp) \
+    if (val !== exp) begin \
+      $display("FAILED(%0d). '%s' expected %b, got %b", `__LINE__, \
+               `"val`", exp, val); \
+      failed = 1'b1; \
+    end
+
+  task automatic schedule_update;
+    input integer count;
+    begin
+      result <= repeat(count) @(posedge clk) 4'ha;
+    end
+  endtask
+
+  always #5 clk = ~clk;
+
+  initial begin
+    clk = 1'b0;
+    failed = 1'b0;
+    result = 4'h0;
+
+    schedule_update(2);
+
+    @(posedge clk);
+    #1;
+    `check(result, 4'h0);
+
+    @(posedge clk);
+    #1;
+    `check(result, 4'ha);
+
+    if (!failed) begin
+      $display("PASSED");
+    end
+    $finish;
+  end
+
+endmodule

ivtest/regress-vvp.list

@@ -174,6 +174,7 @@ module_port_array1		vvp_tests/module_port_array1.json
 module_port_array_fail1		vvp_tests/module_port_array_fail1.json
 module_port_array_init1		vvp_tests/module_port_array_init1.json
 monitor4			vvp_tests/monitor4.json
+nb_ec_repeat_auto		vvp_tests/nb_ec_repeat_auto.json
 named_event_edge_fail		vvp_tests/named_event_edge_fail.json
 named_event_negedge_fail	vvp_tests/named_event_negedge_fail.json
 named_event_posedge_fail	vvp_tests/named_event_posedge_fail.json

ivtest/vvp_tests/nb_ec_repeat_auto.json

@@ -0,0 +1,8 @@
+{
+    "type"   : "normal",
+    "source" : "nb_ec_repeat_auto.v",
+    "vlog95" : {
+        "__comment" : "Automatic tasks are not supported",
+        "type"      : "CE"
+    }
+}