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Add the $anyinit cell and the formalff pass

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These can be used to protect undefined flip-flop initialization values
from optimizations that are not sound for formal verification and can
help mapping all solver-provided values in witness traces for flows that
use different backends simultaneously.
This commit is contained in:
Jannis Harder 2022-07-21 14:22:15 +02:00
parent c26b2bf543
commit c0063288d6
16 changed files with 271 additions and 8 deletions
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CHANGELOG
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@ -4,6 +4,12 @@ List of major changes and improvements between releases
Yosys 0.20 .. Yosys 0.20-dev
--------------------------
* New commands and options
- Added "formalff" pass - transforms FFs for formal verification
* Formal Verification
- Added $anyinit cell to directly represent FFs with an unconstrained
initialization value. These can be generated by the new formalff pass.
Yosys 0.19 .. Yosys 0.20
--------------------------