Add Verific SVA intersect test

Signed-off-by: Clifford Wolf <clifford@clifford.at>

verific/sva/Makefile

-TESTS := seq_and seq_or triggered until until_trig
+TESTS := intersect seq_and seq_or triggered until until_trig
 
 all: $(addsuffix .status,$(TESTS))
 	grep -H . *.status | sed 's,.status:,\t,; s,PASS,pass,;' | expand -t20

verific/sva/intersect.sv

+module sequencer #(
+	//                              01234567890123456789012345678901
+	parameter [32*8-1:0] trace_a = "________________________________",
+	parameter [32*8-1:0] trace_b = "________________________________",
+	parameter [32*8-1:0] trace_c = "________________________________",
+	parameter [32*8-1:0] trace_d = "________________________________"
+
+) (
+	input clock,
+	output A, B, C, D
+);
+	integer t = 0;
+	always @(posedge clock) t <= t + (t < 31);
+
+	assign A = trace_a[8*(31-t) +: 8] == "-";
+	assign B = trace_b[8*(31-t) +: 8] == "-";
+	assign C = trace_c[8*(31-t) +: 8] == "-";
+	assign D = trace_d[8*(31-t) +: 8] == "-";
+endmodule
+
+module pass_00 (input clock);
+	wire A, B, C, D;
+
+	sequencer #(
+		//        01234567890123456789012345678901
+		.trace_a("_-______________________________"),
+		.trace_b("__-__________--_________________"),
+		.trace_c("__-----------__-________________"),
+		.trace_d("_____________-__-_______________")
+	) uut (clock, A, B, C, D);
+
+	assert property (@(posedge clock) (A |=> ((B ##1 !B [*] ##1 B) intersect (C [*] ##1 D)) ##1 B ##1 C ##1 D));
+endmodule
+
+module fail_01 (input clock);
+	wire A, B, C, D;
+
+	sequencer #(
+		//        01234567890123456789012345678901
+		.trace_a("_-______________________________"),
+		.trace_b("__-_________-_-_________________"),
+		.trace_c("__-----------__-________________"),
+		.trace_d("_____________-__-_______________")
+	) uut (clock, A, B, C, D);
+
+	assert property (@(posedge clock) (A |=> ((B ##1 !B [*] ##1 B) intersect (C [*] ##1 D)) ##1 B ##1 C ##1 D));
+endmodule
+
+module fail_02 (input clock);
+	wire A, B, C, D;
+
+	sequencer #(
+		//        01234567890123456789012345678901
+		.trace_a("_-______________________________"),
+		.trace_b("__-__________--_________________"),
+		.trace_c("__----------___-________________"),
+		.trace_d("_____________-__-_______________")
+	) uut (clock, A, B, C, D);
+
+	assert property (@(posedge clock) (A |=> ((B ##1 !B [*] ##1 B) intersect (C [*] ##1 D)) ##1 B ##1 C ##1 D));
+endmodule
+
+module fail_03 (input clock);
+	wire A, B, C, D;
+
+	sequencer #(
+		//        01234567890123456789012345678901
+		.trace_a("_-______________________________"),
+		.trace_b("__-__________-_-________________"),
+		.trace_c("__-----------___-_______________"),
+		.trace_d("_____________-___-______________")
+	) uut (clock, A, B, C, D);
+
+	assert property (@(posedge clock) (A |=> ((B ##1 !B [*] ##1 B) intersect (C [*] ##1 D)) ##1 B ##1 C ##1 D));
+endmodule
+
+module fail_04 (input clock);
+	wire A, B, C, D;
+
+	sequencer #(
+		//        01234567890123456789012345678901
+		.trace_a("_-______________________________"),
+		.trace_b("__-__________--_________________"),
+		.trace_c("__----------___-________________"),
+		.trace_d("____________-___-_______________")
+	) uut (clock, A, B, C, D);
+
+	assert property (@(posedge clock) (A |=> ((B ##1 !B [*] ##1 B) intersect (C [*] ##1 D)) ##1 B ##1 C ##1 D));
+endmodule