yosys/docs/source/cell/properties.rst

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Cell properties
---------------
.. TODO:: Fill :cell:ref:`is_evaluable`
.. cell:defprop:: is_evaluable
.. cell:defprop:: x-aware
Some passes will treat these cells as the non 'x' aware cell. For example,
during synthesis `$eqx` will typically be treated as `$eq`.
.. cell:defprop:: x-output
These cells can produce 'x' output even if all inputs are defined. For
example, a `$div` cell with ``B=0`` has undefined output.
Refer to the :ref:`propindex` for the list of cells with a given property.