Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
107a2e8b2e
This PR adds toInt theorems for BitVec.signExtend.
If the current width `w` is larger than the extended width `v`,
then the value when interpreted as an integer is truncated,
and we compute a modulo by `2^v`.
```lean
theorem toInt_signExtend_of_le (x : BitVec w) (hv : v ≤ w) :
(x.signExtend v).toInt = Int.bmod (x.toNat) (2^v)
```
Co-authored-by: Siddharth Bhat <siddu.druid@gmail.com>
Co-authored-by: Harun Khan <harun19@stanford.edu>
Stacked on top of #6155
---------
Co-authored-by: Harun Khan <harun19@stanford.edu>
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