Add ice40 test_dsp_map test case generator

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

techlibs/ice40/tests/.gitignore

@@ -4,3 +4,7 @@
 /test_dsp_model.vcd
 /test_dsp_model_ref.v
 /test_dsp_model_uut.v
+/test_dsp_map
+/test_dsp_map_tb.v
+/test_dsp_map_top.v
+/test_dsp_map_syn.v

techlibs/ice40/tests/test_dsp_map.sh

@@ -0,0 +1,95 @@
+#!/bin/bash
+set -ex
+
+SZA=$(( 3 + $RANDOM % 13 ))
+SZB=$(( 3 + $RANDOM % 13 ))
+SZO=$(( 3 + $RANDOM % 29 ))
+
+C0=clk$(( $RANDOM & 1))
+C1=clk$(( $RANDOM & 1))
+C2=clk$(( $RANDOM & 1))
+C3=clk$(( $RANDOM & 1))
+
+E0=$( test $(( $RANDOM & 1 )) -eq 0 && echo posedge || echo negedge )
+E1=$( test $(( $RANDOM & 1 )) -eq 0 && echo posedge || echo negedge )
+E2=$( test $(( $RANDOM & 1 )) -eq 0 && echo posedge || echo negedge )
+E3=$( test $(( $RANDOM & 1 )) -eq 0 && echo posedge || echo negedge )
+
+SP=$( test $(( $RANDOM & 1 )) -eq 0 && echo S || echo P )
+
+RC=$( test $(( $RANDOM & 1 )) -eq 0 && echo "reset" || echo "!reset" )
+RV="32'h$( echo $RANDOM | md5sum | cut -c1-8 )"
+
+cat > test_dsp_map_top.v << EOT
+module top (
+	input clk0, clk1, reset,
+	input  [$SZA:0] A,
+	input  [$SZB:0] B,
+	output [$SZO:0] O
+);
+	reg [15:0] AA, BB;
+	reg [31:0] P, S;
+
+	always @($E0 $C0) AA <= A;
+	always @($E1 $C1) BB <= B;
+	always @($E2 $C2) P <= AA * BB;
+	always @($E3 $C3) S <= $RC ? $RV : S + P;
+	assign O = $SP;
+endmodule
+EOT
+
+cat > test_dsp_map_tb.v << EOT
+\`timescale 1ns / 1ps
+module testbench;
+	reg clk1, clk0, reset;
+	reg [$SZA:0] A;
+	reg [$SZB:0] B;
+
+	wire [$SZO:0] O_top, O_syn;
+
+	top top_inst (.clk0(clk0), .clk1(clk1), .reset(reset), .A(A), .B(B), .O(O_top));
+	syn syn_inst (.clk0(clk0), .clk1(clk1), .reset(reset), .A(A), .B(B), .O(O_syn));
+
+	initial begin
+		#2;
+		clk0 = 0;
+		clk1 = 0;
+		reset = 1;
+		A = 0;
+		B = 0;
+
+		repeat (3) begin
+			#2; clk0 = ~clk0;
+			#2; clk0 = ~clk0;
+			#2; clk1 = ~clk1;
+			#2; clk1 = ~clk1;
+		end
+
+		repeat (100) begin
+			#2;
+			A = \$urandom;
+			B = \$urandom;
+			reset = \$urandom & \$urandom & \$urandom & \$urandom;
+			if (\$urandom & 1) begin
+				#2; clk0 = ~clk0;
+				#2; clk0 = ~clk0;
+			end else begin
+				#2; clk1 = ~clk1;
+				#2; clk1 = ~clk1;
+			end
+			#2;
+			if (O_top !== O_syn) begin
+				\$display("ERROR: O_top=%b O_syn=%b", O_top, O_syn);
+				\$stop;
+			end
+			\$display("OK O_top=O_syn=%b", O_top);
+		end
+
+		\$finish;
+	end
+endmodule
+EOT
+
+../../../yosys -p 'read_verilog test_dsp_map_top.v; synth_ice40 -dsp; rename top syn; write_verilog test_dsp_map_syn.v'
+iverilog -o test_dsp_map -s testbench test_dsp_map_tb.v test_dsp_map_top.v test_dsp_map_syn.v ../cells_sim.v
+vvp -N test_dsp_map