[pull] master from YosysHQ:master #57
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The $stable value change expression cannot be true for a non-x signal in the initial state. This is now correctly handled by the verific import, so the dpmem example needs to start assuming `$stable` only after leaving the initial state.
examples: Fix use of SVA value change expressions
add test for yosys's $divfloor and $modfloor cells
Check for required auxiliary tools and always regenerate the make rules when the set of available tools changes.
Prevent rst_n from going low once it has gone high.
Adding variations in .sby file where tabby uses verific and oss doesn't.
Abbreviates additional btor instructions.
This avoids regenerating the test makefile rules when the set of installed tools changes and is a bit simpler overall.
Test makefile improvements
Test designs using $allconst
The checks for available tools moved to a python script, so need need to have a copy of the tool list in the Makefile.
tests: Remove unused tool list in test Makefile
This requires YosysHQ/yosys#3961 and #249 to work
Add aigcxemin and cexenum.py tools
Fix PREFIX in makefile to accept environment variable, if set
They are only useful and supported for the simulation that is run with the output of the prep flow, not the output of the backend flows.
Prepare SBY for upcomming `$check` cell support and prevent backend failure for `$print` cells
Update workflows
tests: Support testing an installed SBY using the SBY_CMD make variable
sby_design: Also track fairness assumptions
This adds initial support for an sqlite database that is shared across multiple tasks of a single SBY file and that can track the status of individual properties. The amount of information tracked in the database is currently quite minimal and depends on the engine and options used. This can be incrementally extended in the future. The ways in which the information in the database can be queries is even more limited for this initial version, consisting of a single '--status' option which lists all properties and their status.
Support for "abc --keep-going pdr" via new "pdr -X" mode
Improved CLI behavior when not specifying a config or existing workdir
ABC will sometimes return negative frame numbers when proving by convergence, e.g. ``` engine_0: Proved output 1 in frame -698905656 (converged). engine_0: Proved output 4 in frame -698905656 (converged). ``` This change fixes these properties being missed and causing the engine status to return UNKNOWN due to `proved_count != len(proved)`.
Update sby_engine_abc.py
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