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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 <gtest/gtest.h>
#include "env.h"
#include "node/node_manager.h"
#include "rewrite/rewriter.h"
namespace bzla::test {
using namespace bzla::node;
class TestRewriterUtils : public ::testing::Test
{
void SetUp() override
{
d_a = d_nm.mk_const(d_nm.mk_bool_type());
d_b = d_nm.mk_const(d_nm.mk_bool_type());
d_c = d_nm.mk_const(d_nm.mk_bool_type());
d_bv4_type = d_nm.mk_bv_type(4);
d_a4 = d_nm.mk_const(d_bv4_type);
d_b4 = d_nm.mk_const(d_bv4_type);
d_c4 = d_nm.mk_const(d_bv4_type);
}
protected:
TestRewriterUtils() : d_env(d_nm), d_rewriter(d_env.rewriter()) {}
NodeManager d_nm;
Env d_env;
Rewriter& d_rewriter;
Type d_bv4_type;
Node d_a;
Node d_b;
Node d_c;
Node d_a4;
Node d_b4;
Node d_c4;
};
TEST_F(TestRewriterUtils, is_or)
{
Node res, child0, child1;
RewriteRuleKind kind;
Node bor = d_nm.mk_node(Kind::OR, {d_a, d_b});
ASSERT_TRUE(d_rewriter.is_or(bor, child0, child1));
ASSERT_EQ(child0, d_a);
ASSERT_EQ(child1, d_b);
std::tie(res, kind) =
RewriteRule<RewriteRuleKind::OR_ELIM>::apply(d_rewriter, bor);
ASSERT_TRUE(d_rewriter.is_or(res, child0, child1));
ASSERT_EQ(child0, d_a);
ASSERT_EQ(child1, d_b);
ASSERT_FALSE(
d_rewriter.is_or(d_nm.mk_node(Kind::AND, {d_a, d_b}), child0, child1));
}
TEST_F(TestRewriterUtils, is_xor)
{
Node res, child0, child1;
RewriteRuleKind kind;
Node bxor = d_nm.mk_node(Kind::XOR, {d_a, d_b});
ASSERT_TRUE(d_rewriter.is_xor(bxor, child0, child1));
ASSERT_EQ(child0, d_a);
ASSERT_EQ(child1, d_b);
std::tie(res, kind) =
RewriteRule<RewriteRuleKind::XOR_ELIM>::apply(d_rewriter, bxor);
ASSERT_TRUE(d_rewriter.is_xor(res, child0, child1));
ASSERT_EQ(child0, d_a);
ASSERT_EQ(child1, d_b);
ASSERT_FALSE(
d_rewriter.is_xor(d_nm.mk_node(Kind::AND, {d_a, d_b}), child0, child1));
ASSERT_FALSE(d_rewriter.is_xor(
d_nm.mk_node(Kind::AND,
{d_nm.mk_node(Kind::OR, {d_a, d_b}),
d_nm.invert_node(d_nm.mk_node(Kind::AND, {d_a, d_c}))}),
child0,
child1));
}
TEST_F(TestRewriterUtils, is_xnor)
{
Node res, child0, child1;
RewriteRuleKind kind;
Node bxor = d_nm.mk_node(Kind::XOR, {d_a, d_b});
Node bxnor = d_nm.invert_node(bxor);
ASSERT_TRUE(d_rewriter.is_xnor(bxnor, child0, child1));
ASSERT_EQ(child0, d_a);
ASSERT_EQ(child1, d_b);
std::tie(res, kind) =
RewriteRule<RewriteRuleKind::XOR_ELIM>::apply(d_rewriter, bxor);
bxnor = d_nm.invert_node(res);
ASSERT_TRUE(d_rewriter.is_xnor(bxnor, child0, child1));
ASSERT_EQ(child0, d_a);
ASSERT_EQ(child1, d_b);
ASSERT_FALSE(d_rewriter.is_xnor(bxor, child0, child1));
}
TEST_F(TestRewriterUtils, is_bv_neg)
{
Node res, child;
RewriteRuleKind kind;
Node bvneg = d_nm.mk_node(Kind::BV_NEG, {d_a4});
ASSERT_TRUE(d_rewriter.is_bv_neg(bvneg, child));
ASSERT_EQ(child, d_a4);
std::tie(res, kind) =
RewriteRule<RewriteRuleKind::BV_NEG_ELIM>::apply(d_rewriter, bvneg);
ASSERT_TRUE(d_rewriter.is_bv_neg(res, child));
ASSERT_EQ(child, d_a4);
ASSERT_FALSE(d_rewriter.is_bv_neg(d_nm.invert_node(d_a4), child));
}
TEST_F(TestRewriterUtils, is_bv_or)
{
Node res, child0, child1;
RewriteRuleKind kind;
Node bvor = d_nm.mk_node(Kind::BV_OR, {d_a4, d_b4});
ASSERT_TRUE(d_rewriter.is_bv_or(bvor, child0, child1));
ASSERT_EQ(child0, d_a4);
ASSERT_EQ(child1, d_b4);
std::tie(res, kind) =
RewriteRule<RewriteRuleKind::BV_OR_ELIM>::apply(d_rewriter, bvor);
ASSERT_TRUE(d_rewriter.is_bv_or(res, child0, child1));
ASSERT_EQ(child0, d_a4);
ASSERT_EQ(child1, d_b4);
ASSERT_FALSE(d_rewriter.is_bv_or(
d_nm.mk_node(Kind::BV_AND, {d_a4, d_b4}), child0, child1));
}
TEST_F(TestRewriterUtils, is_bv_sub)
{
Node res, child0, child1;
RewriteRuleKind kind;
Node bvsub = d_nm.mk_node(Kind::BV_SUB, {d_a4, d_b4});
ASSERT_TRUE(d_rewriter.is_bv_sub(bvsub, child0, child1));
ASSERT_EQ(child0, d_a4);
ASSERT_EQ(child1, d_b4);
std::tie(res, kind) =
RewriteRule<RewriteRuleKind::BV_SUB_ELIM>::apply(d_rewriter, bvsub);
ASSERT_TRUE(d_rewriter.is_bv_sub(res, child0, child1));
ASSERT_EQ(child0, d_a4);
ASSERT_EQ(child1, d_b4);
ASSERT_TRUE(d_rewriter.is_bv_sub(
d_nm.mk_node(Kind::BV_ADD,
{d_nm.mk_node(Kind::BV_ADD,
{d_nm.invert_node(d_a4),
d_nm.mk_value(BitVector::mk_one(4))}),
d_b4}),
child0,
child1));
ASSERT_EQ(child0, d_b4);
ASSERT_EQ(child1, d_a4);
ASSERT_FALSE(d_rewriter.is_bv_sub(
d_nm.mk_node(Kind::BV_AND, {d_a4, d_b4}), child0, child1));
}
TEST_F(TestRewriterUtils, is_bv_xnor)
{
Node res, child0, child1;
RewriteRuleKind kind;
Node bvxnor = d_nm.mk_node(Kind::BV_XNOR, {d_a4, d_b4});
ASSERT_TRUE(d_rewriter.is_bv_xnor(bvxnor, child0, child1));
ASSERT_EQ(child0, d_a4);
ASSERT_EQ(child1, d_b4);
std::tie(res, kind) =
RewriteRule<RewriteRuleKind::BV_XNOR_ELIM>::apply(d_rewriter, bvxnor);
ASSERT_TRUE(d_rewriter.is_bv_xnor(res, child0, child1));
ASSERT_EQ(child0, d_a4);
ASSERT_EQ(child1, d_b4);
ASSERT_FALSE(d_rewriter.is_bv_xnor(
d_nm.mk_node(Kind::BV_XOR, {d_a4, d_b4}), child0, child1));
ASSERT_FALSE(d_rewriter.is_bv_xnor(
d_nm.invert_node(d_nm.mk_node(
Kind::BV_AND,
{d_nm.mk_node(Kind::BV_OR, {d_a4, d_b4}),
d_nm.invert_node(d_nm.mk_node(Kind::BV_AND, {d_a4, d_c4}))})),
child0,
child1));
}
} // namespace bzla::test
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