Additional tests for FV $check compatibility

tests/various/clk2fflogic_effects.sv

@@ -0,0 +1,82 @@
+module top;
+
+(* gclk *)
+reg gclk;
+
+reg clk = 0;
+always @(posedge gclk)
+    clk <= !clk;
+
+reg [4:0] counter = 0;
+
+reg eff_0_trg = '0;
+reg eff_0_en = '0;
+
+reg eff_1_trgA = '0;
+reg eff_1_trgB = '0;
+reg eff_1_en = '0;
+
+reg eff_2_trgA = '0;
+reg eff_2_trgB = '0;
+reg eff_2_en = '0;
+
+`ifdef FAST
+always @(posedge gclk) begin
+`else
+always @(posedge clk) begin
+`endif
+    counter <= counter + 1;
+
+    eff_0_trg = 32'b00000000000000110011001100101010 >> counter;
+    eff_0_en <= 32'b00000000000001100000110110110110 >> counter;
+
+    eff_1_trgA = 32'b00000000000000000011110000011110 >> counter;
+    eff_1_trgB = 32'b00000000000000001111000001111000 >> counter;
+    eff_1_en  <= 32'b00000000000000001010101010101010 >> counter;
+
+    eff_2_trgA = counter[0];
+    eff_2_trgB = !counter[0];
+    eff_2_en  <= 32'b00000000000000000000001111111100 >> counter;
+end
+
+always @(posedge eff_0_trg)
+    if (eff_0_en)
+        $display("%02d: eff0 +", counter);
+
+always @(negedge eff_0_trg)
+    if (eff_0_en)
+        $display("%02d: eff0 -", counter);
+
+always @(posedge eff_0_trg, negedge eff_0_trg)
+    if (eff_0_en)
+        $display("%02d: eff0 *", counter);
+
+always @(posedge eff_1_trgA, posedge eff_1_trgB)
+    if (eff_1_en)
+        $display("%02d: eff1 ++", counter);
+
+always @(posedge eff_1_trgA, negedge eff_1_trgB)
+    if (eff_1_en)
+        $display("%02d: eff1 +-", counter);
+
+always @(negedge eff_1_trgA, posedge eff_1_trgB)
+    if (eff_1_en)
+        $display("%02d: eff1 -+", counter);
+
+always @(negedge eff_1_trgA, negedge eff_1_trgB)
+    if (eff_1_en)
+        $display("%02d: eff1 --", counter);
+
+always @(posedge eff_2_trgA, posedge eff_2_trgB)
+    if (eff_2_en)
+        $display("repeated");
+
+`ifdef __ICARUS__
+initial gclk = 0;
+always @(gclk) gclk <= #5 !gclk;
+always @(posedge gclk)
+    if (counter == 31)
+        $finish(0);
+`endif
+
+endmodule