Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
7c62881a95
This PR adds short-circuit support to bv_decide to accelerate multiplications with shared coefficients. In particular, `a * x = b * x` can be extended to `a = b v (a * x = b * x)`. The latter is faster if `a = b` is true, as `a = b` may be evaluated without considering the multiplication circuit. On the other hand, we require the multiplication circuit, as `a * x = b * x -> a = b` is not always true due to two's complement wrapping. We support multiplications through acNF, which takes into account shared terms across equality canonicalizing `a * (b * c1) = a * (b * c2)` to `(a * b) * c1 = (a * b) * c2`. As a result, the non-shared terms are lifted to the top such that canonical rewrites for binary multiplication with shared terms on the left/right are sufficient. We add an option `bv_decide +shortCircuit` which controls this feature (currently disabled by default). --------- Co-authored-by: Siddharth Bhat <siddu.druid@gmail.com> Co-authored-by: Henrik Böving <hargonix@gmail.com> |
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