Move ALU test cases to external testcase file

This makes is a little easier to create new ALU testcases and to quickly
read and understand the existing testcases.  Additionally, the test bench
itself can now report when a test fails, rather than requiring inspection
on the waveform (though the waveform is still available).

1 files changed, 27 insertions, 0 deletions

diff --git a/testbench.vh b/testbench.vh
new file mode 100644
index 0000000..9838164
--- /dev/null
+++ b/testbench.vh
@@ -0,0 +1,27 @@
+`ifndef TESTBENCH_VH
+`define TESTBENCH_VH
+
+`define MAX_LINE_LENGTH 128
+`define EOF 32'hFFFF_FFFF
+
+task skip_comments(input integer file);
+	integer c, r, quit;
+	reg [8*`MAX_LINE_LENGTH:0] line;
+
+	quit = 0;
+	while (quit == 0) begin
+		c = $fgetc(file);
+		if (c == `EOF) begin
+			quit = 1;
+		end else if (c == "#") begin
+			r = $fgets(line, file);
+		end else if (c != "\n") begin
+			r = $ungetc(c, file);
+			quit = 1;
+		end
+	end
+endtask
+
+`endif
+
+// vim: syntax=verilog