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eqbits drop_all.

This commit is contained in:
nella 2026-07-11 12:34:37 +02:00
parent dbc117a4d5
commit 0cf045b3bd
1 changed files with 11 additions and 0 deletions
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11
passes/opt/opt_dff.cc
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@ -1260,9 +1260,18 @@ struct OptDffWorker
// Build the next-state function n_lit[idx] of every candidate bit by
// folding the FF's control logic on top of the D input (-> next value)
// Verified merges can depend on the equality of classes that are still unproven, so an incomplete run cannot keep any of them
auto drop_all = [&]() -> std::vector<std::vector<int>> {
log("Dropping all equivalent-FF merge candidates in module %s (sat effort budget exceeded before all classes were proven).\n", log_id(module));
return {};
};
int64_t cells_charged = 0;
// Two bits are equivalent if their next states always agree whenever their
// current states (and those of every other candidate pair) agree
for (auto &cls : classes) {
if (sat_budget_spent())
return drop_all();
for (int idx : cls) {
const EqBit &eb = bits[idx];
const FfData &ff = ff_for_cell.at(eb.cell);
@ -1294,6 +1303,8 @@ struct OptDffWorker
n_lit[idx] = n;
}
qcsat.prepare();
charge_import(qcsat, cells_charged);
}
qcsat.prepare();