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/***
* Bitwuzla: Satisfiability Modulo Theories (SMT) solver.
*
* Copyright (C) 2023 by the authors listed in the AUTHORS file at
* https://github.com/bitwuzla/bitwuzla/blob/main/AUTHORS
*
* This file is part of Bitwuzla under the MIT license. See COPYING for more
* information at https://github.com/bitwuzla/bitwuzla/blob/main/COPYING
*/
#include <bitwuzla/cpp/bitwuzla.h>
using namespace bitwuzla;
int
main()
{
// First, create a term manager instance.
TermManager tm;
// Create a Bitwuzla options instance.
Options options;
// Then, enable unsat core extraction.
// Note: Unsat core extraction is disabled by default.
options.set(Option::PRODUCE_UNSAT_CORES, true);
// Then, create a Bitwuzla instance.
Bitwuzla bitwuzla(tm, options);
// Create a bit-vector sort of size 2.
Sort sortbv2 = tm.mk_bv_sort(2);
// Create a bit-vector sort of size 4.
Sort sortbv4 = tm.mk_bv_sort(4);
// Create Float16 floatinf-point sort.
Sort sortfp16 = tm.mk_fp_sort(5, 11);
// Create bit-vector variables.
// (declare-const x0 (_ BitVec 4))
Term x0 = tm.mk_const(sortbv4, "x0");
// (declare-const x1 (_ BitVec 2))
Term x1 = tm.mk_const(sortbv2, "x1");
// (declare-const x2 (_ BitVec 2))
Term x2 = tm.mk_const(sortbv2, "x2");
// (declare-const x3 (_ BitVec 2))
Term x3 = tm.mk_const(sortbv2, "x3");
// (declare-const x4 Float16)
Term x4 = tm.mk_const(sortfp16, "x4");
// Create FP positive zero.
Term fpzero = tm.mk_fp_pos_zero(sortfp16);
// Create BV zero of size 4.
Term bvzero = tm.mk_bv_zero(sortbv4);
// (define-fun f0 ((a Float16)) Bool (fp.gt a (_ +zero 5 11)))
Term a_f0 = tm.mk_var(sortfp16, "a_f0");
Term f0 =
tm.mk_term(Kind::LAMBDA, {a_f0, tm.mk_term(Kind::FP_GT, {a_f0, fpzero})});
// (define-fun f1 ((a Float16)) (_ BitVec 4) (ite (f0 a) x0 #b0000))
Term a_f1 = tm.mk_var(sortfp16, "a_f1");
Term f1 = tm.mk_term(
Kind::LAMBDA,
{a_f1,
tm.mk_term(Kind::ITE,
{tm.mk_term(Kind::APPLY, {f0, a_f1}), x0, bvzero})});
// (define-fun f2 ((a Float16)) (_ BitVec 2) ((_ extract 1 0) (f1 a)))
Term a_f2 = tm.mk_var(sortfp16, "a_f2");
Term f2 = tm.mk_term(
Kind::LAMBDA,
{a_f2,
tm.mk_term(
Kind::BV_EXTRACT, {tm.mk_term(Kind::APPLY, {f1, a_f2})}, {1, 0})});
// (assert (! (bvult x2 (f2 (_ +zero 5 11))) :named a0))
Term a0 =
tm.mk_term(Kind::BV_ULT, {x2, tm.mk_term(Kind::APPLY, {f2, fpzero})});
bitwuzla.assert_formula(a0);
// (assert (! (= x1 x2 x3) :named a1))
Term a1 = tm.mk_term(Kind::EQUAL, {x1, x2, x3});
bitwuzla.assert_formula(a1);
// (assert (!(= x4 ((_ to_fp_unsigned 5 11) RNE x3)) :named a2))
Term a2 = tm.mk_term(Kind::EQUAL,
{x4,
tm.mk_term(Kind::FP_TO_FP_FROM_UBV,
{tm.mk_rm_value(RoundingMode::RNE), x3},
{5, 11})});
bitwuzla.assert_formula(a2);
// (check-sat)
Result result = bitwuzla.check_sat();
std::cout << "Expect: unsat" << std::endl;
std::cout << "Bitwuzla: " << result << std::endl;
// (get-unsat-core)
auto unsat_core = bitwuzla.get_unsat_core();
std::cout << "Unsat Core:" << std::endl << "{" << std::endl;
for (const auto& t : unsat_core)
{
std::cout << " " << t << std::endl;
}
std::cout << "}" << std::endl;
return 0;
}
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