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Fix dependency tracking for input boolean conflicts

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This commit is contained in:
Jakob Rath 2023-02-06 16:28:41 +01:00
parent d105c1c825
commit c79a16db2a
1 changed files with 2 additions and 2 deletions
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4
src/math/polysat/solver.cpp
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@ -153,12 +153,13 @@ namespace polysat {
if (is_conflict())
return; // no need to do anything if we already have a conflict at base level
sat::literal lit = c.blit();
LOG("New constraint: " << lit_pp(*this, c));
LOG("New constraint " << c << " for " << dep);
switch (m_bvars.value(lit)) {
case l_false:
// Input literal contradicts current boolean state (e.g., opposite literals in the input)
// => conflict only flags the inconsistency
set_conflict_at_base_level(dep);
m_conflict.insert(~c); // ~c is true in the solver, need to track its original dependencies
return;
case l_true:
// constraint c is already asserted => ignore
@ -172,7 +173,6 @@ namespace polysat {
switch (c.eval()) {
case l_false:
// asserted an always-false constraint => conflict at base level
LOG("Always false: " << c);
set_conflict_at_base_level(dep);
return;
case l_true: