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This commit is contained in:
Eddie Hung 2018-07-25 22:32:07 -07:00
parent 8f930d683b
commit e5d3821955
2 changed files with 27 additions and 20 deletions
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45
common/timing.cc
View File

@ -30,11 +30,11 @@ 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);
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, UpdateMap *updates,
delay_t &min_slack, PortRefList *current_path, PortRefList* crit_path)
delay_t &min_slack, PortRefList *current_path, PortRefList *crit_path)
{
delay_t value;
if (ctx->getPortClock(user.cell, user.port) != IdString()) {
@ -43,7 +43,8 @@ static delay_t follow_user_port(Context *ctx, PortRef &user, int path_length, de
value = slack / path_length;
if (slack < min_slack) {
min_slack = slack;
if (crit_path) *crit_path = *current_path;
if (crit_path)
*crit_path = *current_path;
}
} else {
// Default to the path ending here, if no further paths found
@ -57,7 +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, updates, min_slack, current_path, crit_path);
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);
}
}
@ -79,11 +81,13 @@ static delay_t follow_net(Context *ctx, NetInfo *net, int path_length, delay_t s
delay_t net_budget = slack / (path_length + 1);
for (unsigned i = 0; i < net->users.size(); ++i) {
auto &usr = net->users[i];
if (crit_path) current_path->push_back(&usr);
net_budget =
std::min(net_budget, follow_user_port(ctx, usr, path_length + 1,
slack - ctx->getNetinfoRouteDelay(net, i), updates, min_slack, current_path, crit_path));
if (crit_path) current_path->pop_back();
if (crit_path)
current_path->push_back(&usr);
net_budget = std::min(net_budget,
follow_user_port(ctx, usr, path_length + 1, slack - ctx->getNetinfoRouteDelay(net, i),
updates, min_slack, current_path, crit_path));
if (crit_path)
current_path->pop_back();
}
return net_budget;
}
@ -224,35 +228,38 @@ void compute_fmax(Context *ctx, bool print_fmax, bool print_path)
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 &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 &port = sink_cell->ports.at(sink->port);
auto net = port.net;
unsigned i = 0;
for (auto& usr : net->users)
if (&usr == sink) break;
auto& driver = net->driver;
for (auto &usr : net->users)
if (&usr == sink)
break;
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));
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("%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));
log_info("estimated Fmax = %.2f MHz\n", 1e6 / (default_slack - min_slack));
}
NEXTPNR_NAMESPACE_END

2
common/timing.h
View File

@ -30,7 +30,7 @@ void assign_budget(Context *ctx);
// Evenly redistribute the total path slack amongst all sinks on each path
void update_budget(Context *ctx);
void compute_fmax(Context *ctx, bool print_fmax=false, bool print_path=false);
void compute_fmax(Context *ctx, bool print_fmax = false, bool print_path = false);
NEXTPNR_NAMESPACE_END