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document abc --keep-going pdr [sc-220]

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docs/source/reference.rst
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@ -343,7 +343,9 @@ the following options:
| | warmup the SMT solver). |
+------------------+---------------------------------------------------------+
| ``--keep-going`` | In BMC mode, continue after the first failed assertion |
| | and report further failed assertions. |
| | and report further failed assertions. (The ``abc`` |
| | engine also supports ``--keep-going`` with ``pdr``; see |
| | the ``abc`` engine section below.) |
+------------------+---------------------------------------------------------+
| ``--unroll``, | Disable/enable unrolling of the SMT problem. The |
| ``--nounroll`` | default value depends on the solver being used. |
@ -427,6 +429,35 @@ solvers:
Solver options are passed as additional arguments to the ABC command
implementing the solver.
When using the ``pdr`` solver, the ``abc`` engine supports the following
engine option:
+------------------+---------------------------------------------------------+
| Option | Description |
+==================+=========================================================+
| ``--keep-going`` | Continue after the first proven or failed assertion and |
| | report individual per-property results. When enabled, |
| | SBY uses the AIGER witness map (``write_aiger -ywmap``) |
| | to track each ``$assert`` cell individually and reports |
| | pass/fail status per property rather than a single |
| | global result. |
+------------------+---------------------------------------------------------+
.. note::
The ``--keep-going`` option for ``abc pdr`` requires a Yosys version that
includes witness-aware AIGER map output (``write_aiger -ywmap`` with
assert/assume path tracking) and the ``rename -witness`` pass covering
formal property cells. The default ``prep`` command already runs
``rename -witness``.
Example:
.. code-block:: sby
[engines]
abc --keep-going pdr
``none`` engine
~~~~~~~~~~~~~~~