caiyu/nextpnr
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Quick hack to route nets with lowest budget first

Browse Source
This commit is contained in:
David Shah 2018-07-21 11:52:41 +02:00
parent d23cdd6c06
commit bbb140c699
1 changed files with 17 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
common/router1.cc
View File

@ -402,6 +402,21 @@ struct Router
NEXTPNR_NAMESPACE_BEGIN
static void prioritise_nets(Context *ctx, std::vector<IdString> &netsArray)
{
std::unordered_map<IdString, delay_t> netScores;
for (auto net_name : netsArray) {
delay_t score = std::numeric_limits<delay_t>::max();
for (const auto &sink : ctx->nets.at(net_name)->users) {
if (sink.budget < score)
score = sink.budget;
}
netScores[net_name] = score;
}
std::sort(netsArray.begin(), netsArray.end(),
[&netScores](IdString a, IdString b) { return netScores[a] < netScores[b]; });
}
bool router1(Context *ctx)
{
try {
@ -508,7 +523,7 @@ bool router1(Context *ctx)
bool printNets = ctx->verbose && (netsQueue.size() < 10);
std::vector<IdString> netsArray(netsQueue.begin(), netsQueue.end());
ctx->sorted_shuffle(netsArray);
prioritise_nets(ctx, netsArray);
netsQueue.clear();
for (auto net_name : netsArray) {
@ -560,7 +575,7 @@ bool router1(Context *ctx)
int ripCnt = 0;
std::vector<IdString> ripupArray(ripupQueue.begin(), ripupQueue.end());
ctx->sorted_shuffle(ripupArray);
prioritise_nets(ctx, ripupArray);
for (auto net_name : ripupArray) {
if (printNets)