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Add simplification to mcd-structured verification module #2828

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Merged
automergerpr-permission-manager merged 2 commits into from
Dec 15, 2025
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Add simplification to mcd-structured verification module #2828

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add simplification to mcd-structured verification module (buf ==K nul…
jberthold Dec 12, 2025
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Merge branch 'master' into simplify-mcd-structured-proofs-rebased
anvacaru Dec 15, 2025
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7 changes: 7 additions & 0 deletions tests/specs/mcd-structured/verification.k
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Expand Up @@ -401,4 +401,11 @@ module LEMMAS-MCD [symbolic]
rule #if B #then C #else D #fi => C requires B [simplification]
rule #if B #then C #else D #fi => C requires notBool B [simplification]

// #buf simplification comparing to null-bytes: compare as Int
rule #buf(N, X:Int) ==K NULLBYTES => X ==Int 0
requires 0 <=Int X
andBool X <=Int 2 ^Int ( 8 *Int N)
andBool #asInteger(NULLBYTES) ==Int 0
[simplification, concrete(NULLBYTES)]
Comment on lines +404 to +409
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@ehildenb ehildenb Dec 15, 2025

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@jberthold shouldn't this be X <Int 2 ^Int (8 *Int N), not <=Int?

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@jberthold jberthold Dec 15, 2025

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That's right, should be <Int, sorry for that. I'll make a PR to correct it.

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@jberthold jberthold Dec 15, 2025

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Thinking about it, we would also want length(NULLBYTES) ==Int N (and 0 <=Int N but that's implied by the former), as well as preserves-definedness.


endmodule