[Support] Add NPN class for Boolean function canonicalization #8747
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This commit introduces NPNClass and BinaryTruthTable classes to the CIRCT Support library for Boolean function equivalence checking and canonicalization. NPNClass computes Negation-Permutation-Negation canonical forms for Boolean functions, enabling efficient detection of functionally equivalent circuits under input/output transformations. BinaryTruthTable provides compact representation using APInt with support for multi-input, multi-output functions. This infrastructure is essential for technology mapping and Boolean function optimization in synthesis flows.
cowardsa
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Jul 21, 2025
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Thank you for the suggestion! Assertion is conditionally enabled via compiler option so it's a bit difficult to test assertion firing in the unit tests (in CI assertions are enabled but we don't enable assertions for the binary release). For this specific conditions, users of NPN/TruthTable are expected to provide APInt with correct bit width so I think CI should have good coverage for this specific asssertions. |
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LGTM - thanks for making the changes - the updated comments also help where you've written !0, !1 - makes it a little easier to follow! |
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This commit introduces NPNClass and BinaryTruthTable classes to the CIRCT Support library for Boolean function equivalence checking and canonicalization.
NPNClass computes Negation-Permutation-Negation canonical forms for Boolean functions, enabling efficient detection of functionally equivalent circuits under input/output transformations. BinaryTruthTable provides compact representation using APInt with support for multi-input, multi-output functions.
This infrastructure is essential for technology mapping and Boolean function optimization in synthesis flows.
computeNPNCanonicalForm. Other changes are for helper functions for TruthTable/NPNClass.