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Frequent lsb special case

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This commit is contained in:
Clemens Eisenhofer 2023-03-07 18:07:39 +01:00
parent f059b5e16b
commit 60a405d134
2 changed files with 84 additions and 35 deletions
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19
src/test/polysat.cpp
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@ -697,7 +697,22 @@ namespace polysat {
vector<ptr_vector<viable::entry>> justifications;
VERIFY(!s.m_viable.collect_bit_information(x.var(), false, fixed, justifications));
}
// parity(x) >= 1 and bit_1(x)
static void test_fi_quickcheck3() {
scoped_solver s(__func__);
auto x = s.var(s.add_var(256));
signed_constraint c1 = s.eq(rational::power_of_two(255) * x);
signed_constraint c2 = s.ult(rational::power_of_two(255), -rational::power_of_two(254) * x);
s.add_clause(c1, false);
s.add_clause(c2, false);
s.m_viable.intersect(x.var(), c1);
s.m_viable.intersect(x.var(), c2);
svector<lbool> fixed;
vector<ptr_vector<viable::entry>> justifications;
VERIFY(!s.m_viable.collect_bit_information(x.var(), false, fixed, justifications));
}
// 8 * x + 3 == 0 or 8 * x + 5 == 0 is unsat
static void test_parity1() {
scoped_solver s(__func__);
@ -2069,6 +2084,8 @@ void tst_polysat() {
RUN(test_polysat::test_fi_quickcheck1());
RUN(test_polysat::test_fi_quickcheck2());
RUN(test_polysat::test_fi_quickcheck3());
if (collect_test_records)
test_records.display(std::cout);
}