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Test forbidden intervals, disequal case

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This commit is contained in:
Jakob Rath 2022-01-19 19:06:35 +01:00
parent 175b348948
commit fa75a9109e
6 changed files with 180 additions and 13 deletions
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21
src/math/polysat/viable.cpp
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@ -206,6 +206,10 @@ namespace polysat {
return floor((e->interval.hi_val() - coeff_val - 1) / e->coeff);
};
// TODO: looks like there's an infinite loop for:
// [match_linear3] a1 = 3; b1 = 0; e1 = 0
// [match_linear3] a2 = 3; b2 = -2; e2 = -2
// naive widening. TODO: can we accelerate this?
// condition e->interval.hi_val() < coeff_val is
// to ensure that widening is performed on the same interval
@ -255,7 +259,8 @@ namespace polysat {
increase_hi(hi);
}
LOG("forbidden interval " << e->coeff << " * " << e->interval << " [" << lo << ", " << hi << "[");
SASSERT(hi <= max_value);
SASSERT(hi <= mod_value);
if (hi == mod_value) hi = 0;
pdd lop = s.var2pdd(v).mk_val(lo);
pdd hip = s.var2pdd(v).mk_val(hi);
entry* ne = alloc_entry();
@ -291,10 +296,11 @@ namespace polysat {
rational const& b1 = e->interval.lo().val();
rational const& a2 = e->interval.hi_val();
rational const& b2 = e->interval.hi().val();
rational lhs = a1 * val + b1;
rational rhs = a2 * val + b2;
SASSERT(a1 != a2 && a1 != 0 && a2 != 0);
rational lhs = mod(a1 * val + b1, mod_value);
rational rhs = mod(a2 * val + b2, mod_value);
auto delta_l = [&](rational const& val) {
rational m1 = ceil((rhs + 1) / a2);
int corr = e->src.is_negative() ? 1 : 0;
@ -304,7 +310,8 @@ namespace polysat {
else
m3 = ceil(m3);
return std::min(m1, m3) - 1;
// return std::min(m1, m3) - 1;
return std::min(val, std::min(m1, m3) - 1);
};
auto delta_u = [&](rational const& val) {
rational m1 = ceil((mod_value - lhs) / a1);
@ -326,8 +333,10 @@ namespace polysat {
// TODO: increase interval
LOG("refine-disequal-lin: " << " [" << lo << ", " << hi << "[");
SASSERT(0 <= lo);
SASSERT(hi <= max_value);
SASSERT(0 <= lo && lo <= val);
// SASSERT(val <= hi && hi <= max_value);
SASSERT(val <= hi && hi <= mod_value);
if (hi == mod_value) hi = 0;
pdd lop = s.var2pdd(v).mk_val(lo);
pdd hip = s.var2pdd(v).mk_val(hi);
entry* ne = alloc_entry();