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feat: BitVec.toInt_neg_eq_ite #6153

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Closed

feat: BitVec.toInt_neg_eq_ite #6153

wants to merge 1 commit into from

Commits on Nov 21, 2024

  1. feat: BitVec.toInt_neg_eq_ite 

    This PR adds a theorem that describes `(-x).toInt` as a case-split:
- If `x = intMin w`, then `(-x)` overflows and is equal to `intMin w = x = -x`.
  and thus `(-x).toInt = x.toInt`.
- otherwise, `(-x).toInt = - (x.toInt)`.

This is a building block to prove `BitVec.toInt_abs`,
from leanprover#5787
    @bollu
    bollu committed Nov 21, 2024
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