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Print quasi-TNS statistic during placement

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Signed-off-by: David Shah <davey1576@gmail.com>
This commit is contained in:
David Shah 2018-06-22 14:58:27 +02:00
parent ab88bfdae1
commit ce4ad44fd1
2 changed files with 20 additions and 11 deletions
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24
common/place_sa.cc
View File

@ -146,8 +146,9 @@ class SAPlacer
// Calculate wirelength after initial placement
curr_wirelength = 0;
curr_tns = 0;
for (auto net : ctx->nets) {
wirelen_t wl = get_wirelength(net.second);
wirelen_t wl = get_wirelength(net.second, curr_tns);
wirelengths[net.first] = wl;
curr_wirelength += wl;
}
@ -162,8 +163,9 @@ class SAPlacer
improved = false;
if (iter % 5 == 0 || iter == 1)
log_info(" at iteration #%d: temp = %f, wire length = %f\n",
iter, temp, double(curr_wirelength));
log_info(" at iteration #%d: temp = %.02f, wire length = "
"%.0f, est tns = %.02fns\n",
iter, temp, double(curr_wirelength), curr_tns);
for (int m = 0; m < 15; ++m) {
// Loop through all automatically placed cells
@ -220,8 +222,9 @@ class SAPlacer
// Recalculate total wirelength entirely to avoid rounding errors
// accumulating over time
curr_wirelength = 0;
curr_tns = 0;
for (auto net : ctx->nets) {
wirelen_t wl = get_wirelength(net.second);
wirelen_t wl = get_wirelength(net.second, curr_tns);
wirelengths[net.first] = wl;
curr_wirelength += wl;
}
@ -308,7 +311,7 @@ class SAPlacer
}
// Get the total estimated wirelength for a net
wirelen_t get_wirelength(NetInfo *net)
wirelen_t get_wirelength(NetInfo *net, float &tns)
{
wirelen_t wirelength = 0;
int driver_x, driver_y;
@ -337,6 +340,8 @@ class SAPlacer
delay_t raw_wl = ctx->estimateDelay(drv_wire, user_wire);
float slack =
ctx->getDelayNS(load.budget) - ctx->getDelayNS(raw_wl);
if (slack < 0)
tns += slack;
worst_slack = std::min(slack, worst_slack);
int load_x, load_y;
bool load_gb;
@ -348,8 +353,9 @@ class SAPlacer
xmax = std::max(xmax, load_x);
ymax = std::max(ymax, load_y);
}
wirelength = wirelen_t((((ymax - ymin) + (xmax - xmin)) *
(1.0 + std::exp(-worst_slack / 5))));
wirelength =
wirelen_t((((ymax - ymin) + (xmax - xmin)) *
std::min(3.0, (1.0 + std::exp(-worst_slack / 10)))));
return wirelength;
}
@ -403,7 +409,8 @@ class SAPlacer
// Recalculate wirelengths for all nets touched by the peturbation
for (auto net : update) {
new_wirelength -= wirelengths.at(net->name);
wirelen_t net_new_wl = get_wirelength(net);
float temp_tns = 0;
wirelen_t net_new_wl = get_wirelength(net, temp_tns);
new_wirelength += net_new_wl;
new_lengths.push_back(std::make_pair(net->name, net_new_wl));
}
@ -465,6 +472,7 @@ class SAPlacer
Context *ctx;
std::unordered_map<IdString, wirelen_t> wirelengths;
wirelen_t curr_wirelength = std::numeric_limits<wirelen_t>::max();
float curr_tns = 0;
float temp = 1000;
bool improved = false;
int n_move, n_accept;

7
common/util.h
View File

@ -20,8 +20,8 @@
#ifndef UTIL_H
#define UTIL_H
#include <string>
#include <map>
#include <string>
#include "nextpnr.h"
NEXTPNR_NAMESPACE_BEGIN
@ -59,11 +59,12 @@ bool bool_or_default(const Container &ct, const KeyType &key, bool def = false)
};
// Wrap an unordered_map, and allow it to be iterated over sorted by key
template <typename K, typename V> std::map<K, V> sorted(const std::unordered_map<K, V> &orig) {
template <typename K, typename V>
std::map<K, V> sorted(const std::unordered_map<K, V> &orig)
{
return std::map<K, V>(orig.begin(), orig.end());
};
NEXTPNR_NAMESPACE_END
#endif