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Added ezSAT::eliminated API to help the SAT solver remember eliminated variables

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This commit is contained in:
Clifford Wolf 2014-03-01 21:00:34 +01:00
parent 23f0a12c72
commit d500bd749f
4 changed files with 17 additions and 3 deletions
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10
libs/ezsat/ezsat.cc
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@ -348,9 +348,13 @@ void ezSAT::freeze(int)
{
}
bool ezSAT::eliminated(int)
{
return false;
}
void ezSAT::assume(int id)
{
if (id < 0)
{
assert(0 < -id && -id <= int(expressions.size()));
@ -486,7 +490,7 @@ int ezSAT::bind(int id)
if (id >= 0) {
assert(0 < id && id <= int(literals.size()));
cnfLiteralVariables.resize(literals.size());
if (cnfLiteralVariables[id-1] == 0) {
if (cnfLiteralVariables[id-1] == 0 || eliminated(cnfLiteralVariables[id-1])) {
cnfLiteralVariables[id-1] = ++cnfVariableCount;
if (id == TRUE)
add_clause(+cnfLiteralVariables[id-1]);
@ -499,7 +503,7 @@ int ezSAT::bind(int id)
assert(0 < -id && -id <= int(expressions.size()));
cnfExpressionVariables.resize(expressions.size());
if (cnfExpressionVariables[-id-1] == 0)
if (cnfExpressionVariables[-id-1] == 0 || eliminated(cnfExpressionVariables[-id-1]))
{
OpId op;
std::vector<int> args;