diff options
Diffstat (limited to 'common/timing.cc')
-rw-r--r-- | common/timing.cc | 274 |
1 files changed, 154 insertions, 120 deletions
diff --git a/common/timing.cc b/common/timing.cc index 0e84dded..afaddbdf 100644 --- a/common/timing.cc +++ b/common/timing.cc @@ -26,16 +26,26 @@ NEXTPNR_NAMESPACE_BEGIN -static delay_t follow_net(Context *ctx, NetInfo *net, int path_length, delay_t slack); +typedef std::unordered_map<const PortInfo *, delay_t> UpdateMap; +typedef std::list<const PortRef *> PortRefList; + +static delay_t follow_net(Context *ctx, NetInfo *net, int path_length, delay_t slack, UpdateMap *updates, + delay_t &min_slack, PortRefList *current_path, PortRefList *crit_path); // Follow a path, returning budget to annotate -static delay_t follow_user_port(Context *ctx, PortRef &user, int path_length, delay_t slack) +static delay_t follow_user_port(Context *ctx, PortRef &user, int path_length, delay_t slack, UpdateMap *updates, + delay_t &min_slack, PortRefList *current_path, PortRefList *crit_path) { delay_t value; if (ctx->getPortClock(user.cell, user.port) != IdString()) { // At the end of a timing path (arguably, should check setup time // here too) value = slack / path_length; + if (slack < min_slack) { + min_slack = slack; + if (crit_path) + *crit_path = *current_path; + } } else { // Default to the path ending here, if no further paths found value = slack / path_length; @@ -48,7 +58,8 @@ static delay_t follow_user_port(Context *ctx, PortRef &user, int path_length, de if (is_path) { NetInfo *net = port.second.net; if (net) { - delay_t path_budget = follow_net(ctx, net, path_length, slack - comb_delay); + delay_t path_budget = follow_net(ctx, net, path_length, slack - comb_delay, updates, min_slack, + current_path, crit_path); value = std::min(value, path_budget); } } @@ -56,50 +67,107 @@ static delay_t follow_user_port(Context *ctx, PortRef &user, int path_length, de } } - if (value < user.budget) { - user.budget = value; + if (updates) { + auto ret = updates->emplace(&user.cell->ports.at(user.port), value); + if (!ret.second) + ret.first->second = std::min(value, ret.first->second); } return value; } -static delay_t follow_net(Context *ctx, NetInfo *net, int path_length, delay_t slack) +static delay_t follow_net(Context *ctx, NetInfo *net, int path_length, delay_t slack, UpdateMap *updates, + delay_t &min_slack, PortRefList *current_path, PortRefList *crit_path) { delay_t net_budget = slack / (path_length + 1); - for (auto &usr : net->users) { - net_budget = std::min(net_budget, follow_user_port(ctx, usr, path_length + 1, slack)); + for (unsigned i = 0; i < net->users.size(); ++i) { + auto &usr = net->users[i]; + if (crit_path) + current_path->push_back(&usr); + // If budget override is less than existing budget, then do not increment path length + int pl = path_length + 1; + auto budget = ctx->getBudgetOverride(net, i, net_budget); + if (budget < net_budget) { + net_budget = budget; + pl = std::max(1, path_length); + } + net_budget = std::min(net_budget, + follow_user_port(ctx, usr, pl, slack - ctx->getNetinfoRouteDelay(net, i), + updates, min_slack, current_path, crit_path)); + if (crit_path) + current_path->pop_back(); } return net_budget; } -void assign_budget(Context *ctx) +static delay_t compute_min_slack(Context *ctx, UpdateMap *updates, PortRefList *crit_path) { - log_break(); - log_info("Annotating ports with timing budgets\n"); - // Clear delays to a very high value first delay_t default_slack = delay_t(1.0e12 / ctx->target_freq); - for (auto &net : ctx->nets) { - for (auto &usr : net.second->users) { - usr.budget = default_slack; - } - } - // Go through all clocked drivers and set up paths + delay_t min_slack = default_slack; + + PortRefList current_path; + + // Go through all clocked drivers and distribute the available path + // slack evenly into the budget of every sink on the path --- + // record this value into the UpdateMap for (auto &cell : ctx->cells) { for (auto port : cell.second->ports) { if (port.second.type == PORT_OUT) { IdString clock_domain = ctx->getPortClock(cell.second.get(), port.first); if (clock_domain != IdString()) { - delay_t slack = delay_t(1.0e12 / ctx->target_freq); // TODO: clock constraints + delay_t slack = default_slack; // TODO: clock constraints + delay_t clkToQ; + if (ctx->getCellDelay(cell.second.get(), clock_domain, port.first, clkToQ)) + slack -= clkToQ; if (port.second.net) - follow_net(ctx, port.second.net, 0, slack); + follow_net(ctx, port.second.net, 0, slack, updates, min_slack, ¤t_path, crit_path); } } } } - // Post-allocation check + return min_slack; +} + +void assign_budget(Context *ctx) +{ + log_break(); + log_info("Annotating ports with timing budgets\n"); + // Clear delays to a very high value first + delay_t default_slack = delay_t(1.0e12 / ctx->target_freq); + for (auto &net : ctx->nets) { + for (auto &usr : net.second->users) { + usr.budget = default_slack; + } + } + + UpdateMap updates; + delay_t min_slack = compute_min_slack(ctx, &updates, nullptr); + + // If user has not specified a frequency, adjust the target frequency dynamically + // TODO(eddieh): Tune these factors + if (!ctx->user_freq) { + if (min_slack < 0) + ctx->target_freq = 1e12 / (default_slack - 0.95 * min_slack); + else + ctx->target_freq = 1e12 / (default_slack - 1.2 * min_slack); + if (ctx->verbose) + log_info("minimum slack for this assign = %d, target Fmax for next update = %.2f MHz\n", min_slack, + ctx->target_freq / 1e6); + } + + // Update the budgets for (auto &net : ctx->nets) { - for (auto user : net.second->users) { - if (user.budget < 0) + for (size_t i = 0; i < net.second->users.size(); ++i) { + auto &user = net.second->users[i]; + auto pi = &user.cell->ports.at(user.port); + auto it = updates.find(pi); + if (it == updates.end()) + continue; + auto budget = ctx->getNetinfoRouteDelay(net.second.get(), i) - it->second; + user.budget = ctx->getBudgetOverride(net.second.get(), i, budget); + + // Post-update check + if (ctx->user_freq && user.budget < 0) log_warning("port %s.%s, connected to net '%s', has negative " "timing budget of %fns\n", user.cell->name.c_str(ctx), user.port.c_str(ctx), net.first.c_str(ctx), @@ -115,112 +183,25 @@ void assign_budget(Context *ctx) log_info("Checksum: 0x%08x\n", ctx->checksum()); } -typedef std::unordered_map<const PortInfo*, delay_t> updates_t; -typedef std::unordered_map<const PortInfo*, delay_t> delays_t; - -static delay_t follow_net_update(Context *ctx, NetInfo *net, int path_length, delay_t slack, const delays_t& delays, updates_t& updates); - -// Follow a path, returning budget to annotate -static delay_t follow_user_port_update(Context *ctx, PortRef &user, int path_length, delay_t slack, const delays_t& delays, updates_t& updates) -{ - delay_t value; - if (ctx->getPortClock(user.cell, user.port) != IdString()) { - // At the end of a timing path (arguably, should check setup time - // here too) - value = slack / path_length; - } else { - // Default to the path ending here, if no further paths found - value = slack / path_length; - // Follow outputs of the user - for (auto& port : user.cell->ports) { - if (port.second.type == PORT_OUT) { - delay_t comb_delay; - // Look up delay through this path - bool is_path = ctx->getCellDelay(user.cell, user.port, port.first, comb_delay); - if (is_path) { - NetInfo *net = port.second.net; - if (net) { - delay_t path_budget = follow_net_update(ctx, net, path_length, slack - comb_delay, delays, updates); - value = std::min(value, path_budget); - } - } - } - } - } - - auto ret = updates.emplace(&user.cell->ports.at(user.port), value); - if (!ret.second && value < ret.first->second) { - ret.first->second = value; - } - return value; -} - -static delay_t follow_net_update(Context *ctx, NetInfo *net, int path_length, delay_t slack, const delays_t& delays,updates_t& updates) -{ - delay_t net_budget = slack / (path_length + 1); - for (auto& usr : net->users) { - net_budget = std::min(net_budget, follow_user_port_update(ctx, usr, path_length + 1, slack - get_or_default(delays, &usr.cell->ports.at(usr.port), 0.), delays, updates)); - } - return net_budget; -} - -void update_budget(Context *ctx, std::function<delay_t(Context*,WireId,WireId)> delay_fn) +void update_budget(Context *ctx) { - delays_t delays; - updates_t updates; - - // Compute the delay for every pin on every net - for (auto &n : ctx->nets) { - auto net = n.second.get(); - - int driver_x, driver_y; - bool driver_gb; - CellInfo *driver_cell = net->driver.cell; - if (!driver_cell) - continue; - if (driver_cell->bel == BelId()) - continue; - ctx->estimatePosition(driver_cell->bel, driver_x, driver_y, driver_gb); - WireId drv_wire = ctx->getWireBelPin(driver_cell->bel, ctx->portPinFromId(net->driver.port)); - if (driver_gb) - continue; - for (auto& load : net->users) { - if (load.cell == nullptr) - continue; - CellInfo *load_cell = load.cell; - if (load_cell->bel == BelId()) - continue; - WireId user_wire = ctx->getWireBelPin(load_cell->bel, ctx->portPinFromId(load.port)); - delay_t raw_wl = delay_fn(ctx, drv_wire, user_wire); - delays.emplace(&load_cell->ports.at(load.port), raw_wl); - } - } - - // Go through all clocked drivers and distribute the available path slack evenly into every budget - for (auto &cell : ctx->cells) { - for (auto& port : cell.second->ports) { - if (port.second.type == PORT_OUT) { - IdString clock_domain = ctx->getPortClock(cell.second.get(), port.first); - if (clock_domain != IdString()) { - if (port.second.net) - follow_net_update(ctx, port.second.net, 0, delay_t(1.0e12 / ctx->target_freq) - get_or_default(delays, &port.second, 0.), delays, updates); - } - } - } - } + UpdateMap updates; + delay_t min_slack = compute_min_slack(ctx, &updates, nullptr); // Update the budgets for (auto &net : ctx->nets) { - for (auto& user : net.second->users) { + for (size_t i = 0; i < net.second->users.size(); ++i) { + auto &user = net.second->users[i]; auto pi = &user.cell->ports.at(user.port); + auto budget = ctx->getNetinfoRouteDelay(net.second.get(), i); auto it = updates.find(pi); - if (it == updates.end()) continue; - auto budget = delays.at(pi) + it->second; - user.budget = ctx->getBudgetOverride(net.second->driver, budget); + if (it != updates.end()) + budget -= it->second; + user.budget = ctx->getBudgetOverride(net.second.get(), i, budget); // Post-update check if (ctx->verbose) { - if (user.budget < 0) + if (ctx->user_freq && user.budget < 0) log_warning("port %s.%s, connected to net '%s', has negative " "timing budget of %fns\n", user.cell->name.c_str(ctx), user.port.c_str(ctx), net.first.c_str(ctx), @@ -233,6 +214,59 @@ void update_budget(Context *ctx, std::function<delay_t(Context*,WireId,WireId)> } } } + + // If user has not specified a frequency, adjust the frequency dynamically: + if (!ctx->user_freq) { + delay_t default_slack = delay_t(1.0e12 / ctx->target_freq); + ctx->target_freq = 1e12 / (default_slack - min_slack); + if (ctx->verbose) + log_info("minimum slack for this update = %d, target Fmax for next update = %.2f MHz\n", min_slack, + ctx->target_freq / 1e6); + } +} + +void compute_fmax(Context *ctx, bool print_fmax, bool print_path) +{ + delay_t default_slack = delay_t(1.0e12 / ctx->target_freq); + PortRefList crit_path; + delay_t min_slack = compute_min_slack(ctx, nullptr, &crit_path); + if (print_path) { + delay_t total = 0; + log_break(); + log_info("Critical path report:\n"); + log_info("curr total\n"); + auto &front = crit_path.front(); + auto &front_port = front->cell->ports.at(front->port); + auto &front_driver = front_port.net->driver; + auto last_port = ctx->getPortClock(front_driver.cell, front_driver.port); + for (auto sink : crit_path) { + auto sink_cell = sink->cell; + auto &port = sink_cell->ports.at(sink->port); + auto net = port.net; + unsigned i = 0; + for (auto &usr : net->users) + if (&usr == sink) break; + else ++i; + auto &driver = net->driver; + auto driver_cell = driver.cell; + delay_t comb_delay; + ctx->getCellDelay(sink_cell, last_port, driver.port, comb_delay); + total += comb_delay; + log_info("%4d %4d Source %s.%s\n", comb_delay, total, driver_cell->name.c_str(ctx), + driver.port.c_str(ctx)); + delay_t net_delay = ctx->getNetinfoRouteDelay(net, i); + total += net_delay; + auto driver_loc = ctx->getBelLocation(driver_cell->bel); + auto sink_loc = ctx->getBelLocation(sink_cell->bel); + log_info("%4d %4d Net %s budget %d (%d,%d) -> (%d,%d)\n", net_delay, total, net->name.c_str(ctx), + sink->budget, driver_loc.x, driver_loc.y, sink_loc.x, sink_loc.y); + log_info(" Sink %s.%s\n", sink_cell->name.c_str(ctx), sink->port.c_str(ctx)); + last_port = sink->port; + } + log_break(); + } + if (print_fmax) + log_info("estimated Fmax = %.2f MHz\n", 1e6 / (default_slack - min_slack)); } NEXTPNR_NAMESPACE_END |