Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
62f3ee2887
This PR adds a new `BitVec.clz` operation and a corresponding `clz` circuit to `bv_decide`, allowing to bitblast the count leading zeroes operation. The AIG circuit is linear in the number of bits of the original expression, making the bitblasting convenient wrt. rewriting. `clz` is common in numerous compiler intrinsics (see [here](https://clang.llvm.org/docs/LanguageExtensions.html#intrinsics-support-within-constant-expressions)) and architectures (see [here](https://en.wikipedia.org/wiki/Find_first_set)). Co-authored by @bollu. --------- Co-authored-by: Tobias Grosser <github@grosser.es> Co-authored-by: Siddharth <siddu.druid@gmail.com> |
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