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fp.xform.bit_blast=true Soundness issue with horn on BV formula #3816

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muchang opened this issue Apr 6, 2020 · 1 comment

muchang commented Apr 6, 2020

Hi,
For this formula:

(assert (forall ((a Bool) (b Bool) (d (_ BitVec 1)) (e (_ BitVec 1)) (f (_ BitVec 1)) (g Bool))
     (= (= f (ite a (_ bv0 1) (ite (not (= d (_ bv0 1))) (_ bv0 1) (ite b e e)))) g)))
(check-sat-using horn)

Z3 gives an incorrect answer:

[615] % z3 small.smt2
unsat
[616] % z3 fp.xform.bit_blast=true small.smt2
sat
[617] % 
[617] % cat small.smt2
(assert (forall ((a Bool) (b Bool) (d (_ BitVec 1)) (e (_ BitVec 1)) (f (_ BitVec 1)) (g Bool))
     (= (= f (ite a (_ bv0 1) (ite (not (= d (_ bv0 1))) (_ bv0 1) (ite b e e)))) g)))
(check-sat-using horn)
[618] %

OS: Ubuntu 18.04
Commit: 3313590

The text was updated successfully, but these errors were encountered:

Contributor

NikolajBjorner commented Apr 7, 2020

fixed by side-effect

NikolajBjorner closed this as completed

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