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fi disequal: add special treatment for v > -a*v

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This commit is contained in:
Jakob Rath 2022-01-24 17:03:49 +01:00
parent 7d3308b00e
commit 8c2f268506
2 changed files with 48 additions and 3 deletions
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24
src/test/polysat.cpp
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@ -1097,6 +1097,29 @@ public:
s.check();
}
static void test_fi_disequal_mild() {
{
// small version
scoped_solver s(__func__);
auto a = s.var(s.add_var(6));
auto b = s.var(s.add_var(6));
// v > -3*v
s.add_eq(a - 3);
s.add_ult(-a*b, b);
s.check();
}
{
// large version
scoped_solver s(__func__);
auto a = s.var(s.add_var(256));
auto b = s.var(s.add_var(256));
// v > -100*v
s.add_eq(a - 100);
s.add_ult(-a*b, b);
s.check();
}
}
// Goal: we probably mix up polysat variables and PDD variables at several points; try to uncover such cases
// NOTE: actually, add_var seems to keep them in sync, so this is not an issue at the moment (but we should still test it later)
// static void test_mixed_vars() {
@ -1352,6 +1375,7 @@ void tst_polysat() {
test_polysat::test_fi_zero();
test_polysat::test_fi_nonzero();
test_polysat::test_fi_nonmax();
test_polysat::test_fi_disequal_mild();
return;
test_polysat::test_l2();