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/****************************************************************************** |
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* Top contributors (to current version): |
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* Aina Niemetz |
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* |
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* This file is part of the cvc5 project. |
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* |
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* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
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* in the top-level source directory and their institutional affiliations. |
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* All rights reserved. See the file COPYING in the top-level source |
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* directory for licensing information. |
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* **************************************************************************** |
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* |
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* Unit tests for the bit-vector rewriter. |
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*/ |
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#include <iostream> |
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#include <memory> |
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#include <vector> |
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#include "expr/node.h" |
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#include "test_smt.h" |
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#include "theory/rewriter.h" |
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#include "util/bitvector.h" |
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namespace cvc5 { |
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using namespace kind; |
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using namespace theory; |
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namespace test { |
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class TestTheoryWhiteBvRewriter : public TestSmt |
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{ |
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protected: |
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Node boolToBv(Node b) |
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{ |
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return d_nodeManager->mkNode(ITE, |
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b, |
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d_nodeManager->mkConst(BitVector(1, 1u)), |
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d_nodeManager->mkConst(BitVector(1, 0u))); |
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} |
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}; |
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TEST_F(TestTheoryWhiteBvRewriter, rewrite_to_fixpoint) |
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{ |
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TypeNode boolType = d_nodeManager->booleanType(); |
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TypeNode bvType = d_nodeManager->mkBitVectorType(1); |
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Node zero = d_nodeManager->mkConst(BitVector(1, 0u)); |
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Node b1 = d_nodeManager->mkVar("b1", boolType); |
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Node b2 = d_nodeManager->mkVar("b2", boolType); |
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Node b3 = d_nodeManager->mkVar("b3", boolType); |
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Node bv = d_nodeManager->mkVar("bv", bvType); |
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Node n = d_nodeManager->mkNode( |
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BITVECTOR_ITE, |
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boolToBv(b1), |
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d_nodeManager->mkNode( |
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BITVECTOR_ITE, |
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boolToBv(b2), |
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d_nodeManager->mkNode(BITVECTOR_ITE, boolToBv(b3), zero, bv), |
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bv), |
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bv); |
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Node nr = Rewriter::rewrite(n); |
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ASSERT_EQ(nr, Rewriter::rewrite(nr)); |
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} |
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TEST_F(TestTheoryWhiteBvRewriter, rewrite_bv_ite) |
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{ |
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TypeNode boolType = d_nodeManager->booleanType(); |
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TypeNode bvType = d_nodeManager->mkBitVectorType(1); |
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Node zero = d_nodeManager->mkConst(BitVector(1, 0u)); |
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Node c1 = d_nodeManager->mkVar("c1", bvType); |
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Node c2 = d_nodeManager->mkVar("c2", bvType); |
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Node ite = d_nodeManager->mkNode(BITVECTOR_ITE, c2, zero, zero); |
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Node n = d_nodeManager->mkNode(BITVECTOR_ITE, c1, ite, ite); |
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Node nr = Rewriter::rewrite(n); |
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ASSERT_EQ(nr, Rewriter::rewrite(nr)); |
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} |
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TEST_F(TestTheoryWhiteBvRewriter, rewrite_bv_comp) |
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{ |
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TypeNode bvType = d_nodeManager->mkBitVectorType(1); |
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Node zero = d_nodeManager->mkConst(BitVector(1, 0u)); |
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Node x = d_nodeManager->mkVar("x", bvType); |
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Node lhs = d_nodeManager->mkNode(BITVECTOR_NOT, x); |
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Node rhs = d_nodeManager->mkNode(BITVECTOR_AND, zero, zero); |
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Node n = d_nodeManager->mkNode(BITVECTOR_COMP, lhs, rhs); |
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Node nr = Rewriter::rewrite(n); |
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// bvcomp(bvnot(x), bvand(0, 0)) ---> x |
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ASSERT_EQ(nr, x); |
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} |
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} // namespace test |
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} // namespace cvc5 |