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This commit is contained in:
Eddie Hung 2018-08-03 23:42:25 -07:00
parent be481cb130
commit 45304d049f
1 changed files with 20 additions and 14 deletions
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34
common/timing.cc
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@ -26,7 +26,7 @@
NEXTPNR_NAMESPACE_BEGIN
typedef std::vector<const PortRef*> PortRefVector;
typedef std::vector<const PortRef *> PortRefVector;
typedef std::map<delay_t, unsigned> DelayFrequency;
struct Timing
@ -38,8 +38,11 @@ struct Timing
PortRefVector *crit_path;
DelayFrequency *slack_histogram;
Timing(Context *ctx, bool update, PortRefVector *crit_path = nullptr, DelayFrequency *slack_histogram = nullptr)
: ctx(ctx), update(update), min_slack(1.0e12 / ctx->target_freq), crit_path(crit_path), slack_histogram(slack_histogram) {}
Timing(Context *ctx, bool update, PortRefVector *crit_path = nullptr, DelayFrequency *slack_histogram = nullptr)
: ctx(ctx), update(update), min_slack(1.0e12 / ctx->target_freq), crit_path(crit_path),
slack_histogram(slack_histogram)
{
}
delay_t follow_net(NetInfo *net, int path_length, delay_t slack)
{
@ -47,7 +50,8 @@ struct Timing
for (auto &usr : net->users) {
if (crit_path)
current_path.push_back(&usr);
// If budget override is less than existing budget, then do not increment path length
// If budget override is less than existing budget, then do not increment
// path length
int pl = path_length + 1;
auto budget = ctx->getBudgetOverride(net, usr, net_budget);
if (budget < net_budget) {
@ -55,8 +59,7 @@ struct Timing
pl = std::max(1, path_length);
}
auto delay = ctx->getNetinfoRouteDelay(net, usr);
net_budget = std::min(
net_budget, follow_user_port(usr, pl, slack - delay));
net_budget = std::min(net_budget, follow_user_port(usr, pl, slack - delay));
if (update)
usr.budget = std::min(usr.budget, delay + net_budget);
if (crit_path)
@ -105,7 +108,7 @@ struct Timing
delay_t walk_paths()
{
delay_t default_slack = delay_t(1.0e12 / ctx->target_freq);
// Go through all clocked drivers and distribute the available path
// slack evenly into the budget of every sink on the path
for (auto &cell : ctx->cells) {
@ -175,8 +178,9 @@ void assign_budget(Context *ctx, bool quiet)
delay_t default_slack = delay_t(1.0e12 / ctx->target_freq);
ctx->target_freq = 1e12 / (default_slack - timing.min_slack);
if (ctx->verbose)
log_info("minimum slack for this assign = %d, target Fmax for next update = %.2f MHz\n", timing.min_slack,
ctx->target_freq / 1e6);
log_info("minimum slack for this assign = %d, target Fmax for next "
"update = %.2f MHz\n",
timing.min_slack, ctx->target_freq / 1e6);
}
if (!quiet)
@ -188,7 +192,8 @@ void timing_analysis(Context *ctx, bool print_histogram, bool print_path)
PortRefVector crit_path;
DelayFrequency slack_histogram;
Timing timing(ctx, false /* update */, print_path ? &crit_path : nullptr, print_histogram ? &slack_histogram : nullptr);
Timing timing(ctx, false /* update */, print_path ? &crit_path : nullptr,
print_histogram ? &slack_histogram : nullptr);
auto min_slack = timing.walk_paths();
if (print_path) {
@ -237,10 +242,10 @@ void timing_analysis(Context *ctx, bool print_histogram, bool print_path)
auto min_slack = slack_histogram.begin()->first;
auto max_slack = slack_histogram.rbegin()->first;
auto bin_size = (max_slack - min_slack) / num_bins;
std::vector<unsigned> bins(num_bins+1);
std::vector<unsigned> bins(num_bins + 1);
unsigned max_freq = 0;
for (const auto& i : slack_histogram) {
auto& bin = bins[(i.first-min_slack) / bin_size];
for (const auto &i : slack_histogram) {
auto &bin = bins[(i.first - min_slack) / bin_size];
bin += i.second;
max_freq = std::max(max_freq, bin);
}
@ -250,7 +255,8 @@ void timing_analysis(Context *ctx, bool print_histogram, bool print_path)
log_info("Slack histogram:\n");
log_info(" legend: * represents %d endpoint(s)\n", max_freq / bar_width);
for (unsigned i = 0; i < bins.size(); ++i)
log_info("%6d < ps < %6d |%s\n", min_slack + bin_size*i, min_slack + bin_size*(i+1), std::string(bins[i] * bar_width / max_freq, '*').c_str());
log_info("%6d < ps < %6d |%s\n", min_slack + bin_size * i, min_slack + bin_size * (i + 1),
std::string(bins[i] * bar_width / max_freq, '*').c_str());
}
}