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Partial support of the primitive bvnot #745

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merged 6 commits into from
Jul 25, 2023

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@Halbaroth Halbaroth commented Jul 21, 2023

This PR add a partial support of the bitvector primitive bvnot. Basically, the canonizer of the bitvector theory pushes the not operator to the leaves of the semantic value as much as it can.

@Halbaroth Halbaroth added this to the 2.5.0 milestone Jul 21, 2023
@Halbaroth Halbaroth marked this pull request as ready for review July 24, 2023 15:35
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There is no regression :) It is ready for review ;)

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I'm not very fond of neg_mode because the use of mode implies a more fundamental change of behavior to me. I'd rather call this just neg or maybe negated which I think is more clear that the function operates as usual, but computes the negation of the result.

But I don't really have a strong justification for this, so if you feel strongly about using neg_mode, it's fine by me.

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@Halbaroth Halbaroth merged commit 084d746 into OCamlPro:next Jul 25, 2023
bclement-ocp added a commit to bclement-ocp/alt-ergo that referenced this pull request Sep 13, 2023
In PR OCamlPro#745 we correctly handled the case where uninterpreted terms
appear deep within a bit-vector terms, but we accidentally missed the
case where the whole bit-vector is itself an uninterpreted term, leading
to unsoundness (see the attached test).

This patch fixes the code to properly deal with `bvnot` applied to an
uninterpreted term.
Halbaroth pushed a commit that referenced this pull request Sep 14, 2023
In PR #745 we correctly handled the case where uninterpreted terms
appear deep within a bit-vector terms, but we accidentally missed the
case where the whole bit-vector is itself an uninterpreted term, leading
to unsoundness (see the attached test).

This patch fixes the code to properly deal with `bvnot` applied to an
uninterpreted term.
Halbaroth pushed a commit to Halbaroth/alt-ergo that referenced this pull request Sep 14, 2023
In PR OCamlPro#745 we correctly handled the case where uninterpreted terms
appear deep within a bit-vector terms, but we accidentally missed the
case where the whole bit-vector is itself an uninterpreted term, leading
to unsoundness (see the attached test).

This patch fixes the code to properly deal with `bvnot` applied to an
uninterpreted term.
Halbaroth added a commit that referenced this pull request Sep 14, 2023
* Do not discard `bvnot` applied to uninterpreted terms

In PR #745 we correctly handled the case where uninterpreted terms
appear deep within a bit-vector terms, but we accidentally missed the
case where the whole bit-vector is itself an uninterpreted term, leading
to unsoundness (see the attached test).

This patch fixes the code to properly deal with `bvnot` applied to an
uninterpreted term.

* Update the changes log for v2.5.1

* Review changes

---------

Co-authored-by: Basile Clément <bc@ocamlpro.com>
Halbaroth pushed a commit to Halbaroth/alt-ergo that referenced this pull request Sep 15, 2023
In PR OCamlPro#745 we correctly handled the case where uninterpreted terms
appear deep within a bit-vector terms, but we accidentally missed the
case where the whole bit-vector is itself an uninterpreted term, leading
to unsoundness (see the attached test).

This patch fixes the code to properly deal with `bvnot` applied to an
uninterpreted term.
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2 participants