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* xprop tests: Make iverilog invocation more portableJannis Harder2023-02-131-3/+3
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* xprop: Test fixes and abort on test failureJannis Harder2023-02-131-2/+2
| | | | | | | | | Use `$finish(0)` to silently exit even when using recent iverlog versions. Run `write_verilog -noexpr` before `write_verilog` as the latter can modify the design. This also enables checking the tests results, as xprop should be in a state where the existing tests pass.
* tests: Fix path of yosys invocation in xprop testsJannis Harder2023-02-101-1/+1
| | | | | For now xprop test failures are still expected and ignored, but without this change, they did not even run unless the yosys build was in path.
* New xprop pass to encode 3-valued x-propagation using 2-valued logicJannis Harder2022-11-301-0/+516