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64 lines
1.9 KiB
Python
Executable File
64 lines
1.9 KiB
Python
Executable File
#!/usr/bin/env python3
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# DESCRIPTION: Verilator: Verilog Test driver/expect definition
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#
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# Copyright 2024 by Wilson Snyder. This program is free software; you
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# can redistribute it and/or modify it under the terms of either the GNU
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# Lesser General Public License Version 3 or the Perl Artistic License
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# Version 2.0.
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# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
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import vltest_bootstrap
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test.scenarios('simulator')
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test.top_filename = test.obj_dir + "/t_timing_long.v"
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# Look for O(n^2) problems in process handling
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def gen(filename):
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with open(filename, 'w', encoding="utf8") as fh:
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fh.write("// Generated by t_timing_long.py\n")
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fh.write("\n")
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fh.write("`ifdef TEST_VERBOSE\n")
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fh.write(" `define MSG(m) $display m\n")
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fh.write("`else\n")
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fh.write(" `define MSG(m)\n")
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fh.write("`endif\n")
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fh.write("\n")
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fh.write("module t;\n")
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fh.write("\n")
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fh.write(" int cnt;\n")
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fh.write("\n")
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fh.write(" initial begin\n")
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n = 100
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for i in range(1, n):
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# If statement around the timing is important to make the code scheduling
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# mostly unpredictable
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fh.write(" if (cnt == " + str(i - 1) + ") begin\n")
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fh.write(" #1; ++cnt; `MSG((\"[%0t] cnt?=" + str(i) + "\", $time));" +
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" if (cnt != " + str(i) + ") $stop;\n")
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fh.write(" end\n")
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fh.write("\n")
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fh.write(' $write("*-* All Finished *-*\\n");' + "\n")
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fh.write(" $finish;\n")
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fh.write(" end\n")
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fh.write("endmodule\n")
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gen(test.top_filename)
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if test.have_coroutines:
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test.compile(verilator_flags2=["--exe --build --main --timing"], make_top=1)
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test.execute()
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test.compile(verilator_flags2=["--exe --build --main --no-timing -Wno-STMTDLY"], make_top=1)
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test.execute()
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test.passes()
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