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    <p>You can currently use integers to encode PB constraints. You have to bound the variables to be in the interval 0, 1. For example:</p> <pre><code> (set-logic QF_LIA) (declare-const n1 Int) (declare-const n2 Int) (assert (&lt;= 0 n1)) (assert (&lt;= n1 1)) (assert (&lt;= 0 n2)) (assert (&lt;= n2 1)) (assert (&gt;= (+ n1 n2) 1)) (check-sat) </code></pre> <p>If you set the logic to QF_LIA, then Z3 will automatically try to re-encode these constraints using bit-vectors. In the verbose output you will see that Z3 invokes a tactic pb2bv that does the rewriting for you</p> <pre><code>z3 ty.smt2 /v:10 (simplifier :num-exprs 10 :num-asts 171 :time 0.00 :before-memory 0.77 :after-memory 0.77) (propagate-values :num-exprs 10 :num-asts 171 :time 0.00 :before-memory 0.77 :after-memory 0.77) (ctx-simplify :num-steps 17) (ctx-simplify :num-exprs 10 :num-asts 171 :time 0.00 :before-memory 0.77 :after-memory 0.77) (simplifier :num-exprs 10 :num-asts 171 :time 0.00 :before-memory 0.77 :after-memory 0.77) (solve_eqs :num-exprs 10 :num-asts 171 :time 0.00 :before-memory 0.77 :after-memory 0.77) (elim-uncnstr-vars :num-exprs 10 :num-asts 171 :time 0.00 :before-memory 0.77 :after-memory 0.77) (simplifier :num-exprs 10 :num-asts 173 :time 0.00 :before-memory 0.77 :after-memory 0.77) (pb2bv :num-exprs 4 :num-asts 180 :time 0.00 :before-memory 0.77 :after-memory 0.77) (simplifier :num-exprs 3 :num-asts 178 :time 0.00 :before-memory 0.77 :after-memory 0.77) (propagate-values :num-exprs 3 :num-asts 178 :time 0.00 :before-memory 0.77 :after-memory 0.77) (solve_eqs :num-exprs 3 :num-asts 178 :time 0.00 :before-memory 0.77 :after-memory 0.77) (max-bv-sharing :num-exprs 3 :num-asts 178 :time 0.00 :before-memory 0.77 :after-memory 0.77) (bit-blaster :num-exprs 3 :num-asts 178 :time 0.00 :before-memory 0.77 :after-memory 0.77) (aig :num-exprs 3 :num-asts 178 :time 0.00 :before-memory 0.77 :after-memory 0.77) (ast-table :capacity 640 :size 178) (sat-status :inconsistent false :vars 2 :elim-vars 0 :lits 2 :assigned 0 :binary-clauses 1 :ternary-clauses 0 :clauses 0 :del-clause 0 :avg-clause-size 2.00 :memory 0.77) </code></pre>
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    1. POWhat is the most efficient way to encode pseudoboolean constraints in z3?
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    1. USNikolaj Bjorner
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    1. POWhat is the most efficient way to encode pseudoboolean constraints in z3?
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