feat: getLsb_replicate #10
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bollu
commented
Jul 23, 2024
| @@ -583,11 +583,9 @@ instance : HAppend (BitVec w) (BitVec v) (BitVec (w + v)) := ⟨.append⟩ | |||
| -- TODO: write this using multiplication | |||
| /-- `replicate i x` concatenates `i` copies of `x` into a new vector of length `w*i`. -/ | |||
| def replicate : (i : Nat) → BitVec w → BitVec (w*i) | |||
| | 0, _ => 0 | |||
| | 0, _ => 0#0 | |||
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Not sure if this change was strictly necessary, but it makes it cleaner to read.
bollu
commented
Jul 23, 2024
| have hEq : w + w*n = w*(n + 1) := by | ||
| rw [Nat.mul_add, Nat.add_comm, Nat.mul_one] | ||
| hEq ▸ (x ++ replicate n x) | ||
| (x ++ replicate n x).cast (by rw [Nat.mul_succ]; omega) |
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I replaced the cast by BitVec.cast, for which we have better equation lemmas.
It addresses a performance issue at https://github.com/leanprover/LNSym/blob/proof_size_expt/Proofs/SHA512/Experiments/Sym20.lean
This allows bitblasting `BitVec.replicate`.
This theorem is meant to say that `List.take` and `List.takeWhile` commute.
This also updates the 4.9.0 release notes with backported changes.
…urrent setting (leanprover#4781) It is confusing that the message suggesting to use the `diagnostics` option is given even when the option is already set. This PR makes use of lazy message data to make the message contingent on the option being false. It also tones down the promise that there is any diagonostic information available, since sometimes there is nothing to report. Suggested by Johan Commelin.
Co-authored-by: Kyle Miller <[email protected]>
To be implemented in leanprover#4814
…er#4538) Co-authored-by: Mac Malone <[email protected]>
This came up in the context of simplifying proof states for https://github.com/leanprover/LNSym.
This message is often incorporated into source files via `#guard_msgs`. This change ensures it won't go over the 100 character ruler, and I think is equally grammatical. :-)
This PR also fixes a missing borrow annotation.
This adds theorems `ushiftRight_rec_zero`, `ushiftRight_rec_succ`, `ushiftRight_rec_eq`, and `shiftRight_eq_shiftRight_rec`. --------- Co-authored-by: Tobias Grosser <[email protected]>
This performance issue was exposed by the benchmarks at https://github.com/leanprover/LNSym/tree/proof_size_expt/Proofs/SHA512/Experiments
Verso needed a symbol that was unexported - this exposes it again.
|
These were merged in leanprover#4873. |
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@hargoniX wanted lemmas for replicate, so here's the lemmas.