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sta: print out arrival histogram

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This commit is contained in:
Eddie Hung 2020-02-18 12:40:05 -08:00
parent dedaab3a7d
commit f157f6cba3
1 changed files with 45 additions and 4 deletions
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49
passes/cmds/sta.cc
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@ -32,7 +32,7 @@ struct StaWorker
SigMap sigmap;
dict<SigBit, std::vector<pair<SigBit, int>>> fanouts;
dict<SigBit, std::pair<SigBit,int>> backtrack;
dict<SigBit, SigBit> backtrack;
std::deque<SigBit> queue;
dict<SigBit, int> endpoints;
@ -149,21 +149,62 @@ struct StaWorker
}
d.first.wire->set_intvec_attribute(ID(sta_arrival), dst_arrivals);
queue.emplace_back(d.first);
backtrack[d.first] = std::make_pair(b, src_arrival);
backtrack[d.first] = b;
}
}
}
log("Latest arrival time in '%s' is %d:\n", log_id(module), maxarrival);
auto b = maxbit;
auto arrival = maxarrival;
int arrival = maxarrival;
auto it = backtrack.find(b);
while (it != backtrack.end()) {
log(" %6d %s\n", arrival, log_signal(b));
std::tie(b,arrival) = it->second;
b = it->second;
arrival = b.wire->get_intvec_attribute(ID(sta_arrival))[b.offset];
it = backtrack.find(b);
}
log(" %6d %s\n", arrival, log_signal(b));
std::map<int, unsigned> arrival_histogram;
for (const auto &i : endpoints) {
const auto &b = i.first;
auto arrival = b.wire->get_intvec_attribute(ID(sta_arrival))[b.offset];
arrival += i.second;
arrival_histogram[arrival]++;
}
for (auto port_name : module->ports) {
auto wire = module->wire(port_name);
if (!wire->port_output)
continue;
for (auto arrival : wire->get_intvec_attribute(ID(sta_arrival)))
arrival_histogram[arrival]++;
}
// Adapted from https://github.com/YosysHQ/nextpnr/blob/affb12cc27ebf409eade062c4c59bb98569d8147/common/timing.cc#L946-L969
if (arrival_histogram.size() > 0) {
unsigned num_bins = 20;
unsigned bar_width = 60;
auto min_arrival = arrival_histogram.begin()->first;
auto max_arrival = arrival_histogram.rbegin()->first;
auto bin_size = std::max<unsigned>(1, ceil((max_arrival - min_arrival + 1) / float(num_bins)));
std::vector<unsigned> bins(num_bins);
unsigned max_freq = 0;
for (const auto &i : arrival_histogram) {
auto &bin = bins[(i.first - min_arrival) / bin_size];
bin += i.second;
max_freq = std::max(max_freq, bin);
}
bar_width = std::min(bar_width, max_freq);
log("\n");
log("Arrival histogram:\n");
log(" legend: * represents %d endpoint(s)\n", max_freq / bar_width);
log(" + represents [1,%d) endpoint(s)\n", max_freq / bar_width);
for (int i = num_bins-1; i >= 0; --i)
log("[%6d, %6d) |%s%c\n", min_arrival + bin_size * i, min_arrival + bin_size * (i + 1),
std::string(bins[i] * bar_width / max_freq, '*').c_str(),
(bins[i] * bar_width) % max_freq > 0 ? '+' : ' ');
}
}
};