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Depth-schedule finar adder.

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This commit is contained in:
nella 2026-06-03 15:35:17 +02:00
parent ba7173a469
commit afabf72e23
4 changed files with 45 additions and 30 deletions
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32
passes/techmap/arith_tree.cc
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@ -309,21 +309,22 @@ struct ArithTreeWorker {
s = module->Not(NEW_ID, s);
pool.push_back({s, 0});
} else {
// Multiplicative operand
auto pps = CompressorTree::generate_partial_products(module, op.sig, op.factor_b, op.is_signed, op.factor_b_signed, width);
// Multiplicative operand
auto pps = CompressorTree::generate_partial_products(module, op.sig, op.factor_b, op.is_signed, op.factor_b_signed, width);
if (!op.negate) {
for (auto &pp : pps)
pool.push_back(pp);
continue;
}
SigSpec neg_a = module->Not(NEW_ID, op.sig);
auto neg_pps = CompressorTree::generate_partial_products(module, neg_a, op.factor_b, op.is_signed, op.factor_b_signed, width);
for (auto &pp : neg_pps)
if (!op.negate) {
for (auto &pp : pps)
pool.push_back(pp);
SigSpec b_ext = CompressorTree::normalize_to_width(op.factor_b, op.factor_b_signed, width);
pool.push_back({b_ext, 0});
continue;
}
auto [pa, pb] = CompressorTree::reduce_scheduled(module, pps, width, opt.strategy);
SigSpec p = module->addWire(NEW_ID, width);
module->addAdd(NEW_ID, pa, pb, p, false);
SigSpec np = module->addWire(NEW_ID, width);
module->addNot(NEW_ID, p, np);
pool.push_back({np, 0});
neg_compensation++;
}
}
@ -337,8 +338,9 @@ struct ArithTreeWorker {
{
int width = GetSize(result_y);
auto pool = build_operand_pool(operands, width, neg_compensation);
auto [a, b] = CompressorTree::reduce_scheduled(module, std::move(pool), width, opt.strategy);
auto final_choice = CompressorTree::pick_final_adder(width, opt.final_mode);
int final_depth = 0;
auto [a, b] = CompressorTree::reduce_scheduled(module, std::move(pool), width, opt.strategy, nullptr, &final_depth);
auto final_choice = CompressorTree::pick_final_adder(width, final_depth, opt.final_mode);
CompressorTree::emit_final_adder(module, a, b, result_y, final_choice);
}