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Do less work if update flag is false

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This commit is contained in:
Eddie Hung 2018-08-06 17:42:44 -07:00
parent f44a5fb904
commit 676500b83f
1 changed files with 6 additions and 6 deletions
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12
common/timing.cc
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@ -215,10 +215,11 @@ struct Timing
if (ctx->getPortClock(usr.cell, usr.port) != IdString()) { if (ctx->getPortClock(usr.cell, usr.port) != IdString()) {
const auto net_arrival = nd.max_arrival; const auto net_arrival = nd.max_arrival;
auto path_budget = clk_period - (net_arrival + net_delay); auto path_budget = clk_period - (net_arrival + net_delay);
auto budget_share = budget_override ? 0 : path_budget / net_length_plus_one; if (update) {
if (update) auto budget_share = budget_override ? 0 : path_budget / net_length_plus_one;
usr.budget = std::min(usr.budget, net_delay + budget_share); usr.budget = std::min(usr.budget, net_delay + budget_share);
net_min_remaining_budget = std::min(net_min_remaining_budget, path_budget - budget_share); net_min_remaining_budget = std::min(net_min_remaining_budget, path_budget - budget_share);
}
if (path_budget < min_slack) { if (path_budget < min_slack) {
min_slack = path_budget; min_slack = path_budget;
@ -232,7 +233,7 @@ struct Timing
int slack_ps = ctx->getDelayNS(path_budget) * 1000; int slack_ps = ctx->getDelayNS(path_budget) * 1000;
(*slack_histogram)[slack_ps]++; (*slack_histogram)[slack_ps]++;
} }
} else { } else if (update) {
// Iterate over all output ports on the same cell as the sink // Iterate over all output ports on the same cell as the sink
for (const auto &port : usr.cell->ports) { for (const auto &port : usr.cell->ports) {
if (port.second.type == PORT_OUT && port.second.net) { if (port.second.type == PORT_OUT && port.second.net) {
@ -241,8 +242,7 @@ struct Timing
if (is_path) { if (is_path) {
auto path_budget = net_data.at(port.second.net).min_remaining_budget; auto path_budget = net_data.at(port.second.net).min_remaining_budget;
auto budget_share = budget_override ? 0 : path_budget / net_length_plus_one; auto budget_share = budget_override ? 0 : path_budget / net_length_plus_one;
if (update) usr.budget = std::min(usr.budget, net_delay + budget_share);
usr.budget = std::min(usr.budget, net_delay + budget_share);
net_min_remaining_budget = net_min_remaining_budget =
std::min(net_min_remaining_budget, path_budget - budget_share); std::min(net_min_remaining_budget, path_budget - budget_share);
} }