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Fixed "share" for complex scenarios with never-active cells

This commit is contained in:
Clifford Wolf 2014-08-09 17:07:20 +02:00
parent b9811d5aff
commit 9d4362990f
1 changed files with 22 additions and 6 deletions
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28
passes/sat/share.cc
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@ -685,12 +685,13 @@ struct ShareWorker
RTLIL::SigSpec cell_activation_signals = bits_from_activation_patterns(cell_activation_patterns);
if (cell_activation_patterns.empty()) {
log (" Cell is never active. Sharing is pointless, we simply remove it.\n");
log(" Cell is never active. Sharing is pointless, we simply remove it.\n");
cells_to_remove.insert(cell);
continue;
}
if (cell_activation_patterns.count(std::pair<RTLIL::SigSpec, RTLIL::Const>())) {
log (" Cell is always active. Therefore no sharing is possible.\n");
log(" Cell is always active. Therefore no sharing is possible.\n");
continue;
}
@ -717,13 +718,15 @@ struct ShareWorker
RTLIL::SigSpec other_cell_activation_signals = bits_from_activation_patterns(other_cell_activation_patterns);
if (other_cell_activation_patterns.empty()) {
log (" Cell is never active. Sharing is pointless, we simply remove it.\n");
log(" Cell is never active. Sharing is pointless, we simply remove it.\n");
shareable_cells.erase(other_cell);
cells_to_remove.insert(other_cell);
continue;
}
if (other_cell_activation_patterns.count(std::pair<RTLIL::SigSpec, RTLIL::Const>())) {
log (" Cell is always active. Therefore no sharing is possible.\n");
log(" Cell is always active. Therefore no sharing is possible.\n");
shareable_cells.erase(other_cell);
continue;
}
@ -750,8 +753,6 @@ struct ShareWorker
optimize_activation_patterns(filtered_other_cell_activation_patterns);
ezDefaultSAT ez;
ez.non_incremental();
SatGen satgen(&ez, &modwalker.sigmap);
std::set<RTLIL::Cell*> sat_cells;
@ -798,6 +799,21 @@ struct ShareWorker
break;
}
if (!ez.solve(ez.expression(ez.OpOr, cell_active))) {
log(" According to the SAT solver the cell %s is never active. Sharing is pointless, we simply remove it.\n", log_id(cell));
cells_to_remove.insert(cell);
break;
}
if (!ez.solve(ez.expression(ez.OpOr, other_cell_active))) {
log(" According to the SAT solver the cell %s is never active. Sharing is pointless, we simply remove it.\n", log_id(other_cell));
cells_to_remove.insert(other_cell);
shareable_cells.erase(other_cell);
continue;
}
ez.non_incremental();
all_ctrl_signals.sort_and_unify();
std::vector<int> sat_model = satgen.importSigSpec(all_ctrl_signals);
std::vector<bool> sat_model_values;