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| author | David Shah <davey1576@gmail.com> | 2018-12-30 10:53:13 +0100 |
|---|---|---|
| committer | David Shah <dave@ds0.me> | 2019-03-22 10:31:54 +0000 |
| commit | 9cd5980d35ac7174ce577b89efac7f4d4a5f8ada (patch) | |
| tree | b1c5cc23ee9eb9735aabc3b5a076cb50d4688c98 /common/placer1.cc | |
| parent | bd0a33022baf78751052e1655557d2e42932504e (diff) | |
| download | nextpnr-9cd5980d35ac7174ce577b89efac7f4d4a5f8ada.tar.gz nextpnr-9cd5980d35ac7174ce577b89efac7f4d4a5f8ada.tar.bz2 nextpnr-9cd5980d35ac7174ce577b89efac7f4d4a5f8ada.zip | |
placer1: Add (currently-unused) option for fanout threshold for timing cost calc
Signed-off-by: David Shah <davey1576@gmail.com>
Diffstat (limited to 'common/placer1.cc')
| -rw-r--r-- | common/placer1.cc | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/common/placer1.cc b/common/placer1.cc index 4f9d6a87..b180ebfb 100644 --- a/common/placer1.cc +++ b/common/placer1.cc @@ -498,7 +498,7 @@ class SAPlacer if (other_cell != nullptr) new_dist += get_constraints_distance(ctx, other_cell); delta = lambda * (moveChange.timing_delta / std::max<double>(last_timing_cost, epsilon)) + - (1 - lambda) * (double(moveChange.wirelen_delta) / std::max<double>(last_wirelen_cost, epsilon)); + (1 - lambda) * (double(moveChange.wirelen_delta) / std::max<double>(last_wirelen_cost, epsilon)); delta += (cfg.constraintWeight / temp) * (new_dist - old_dist) / last_wirelen_cost; n_move++; // SA acceptance criterea @@ -729,7 +729,7 @@ class SAPlacer if (ignore_net(ni)) continue; net_bounds[ni->udata] = get_net_bounds(ni); - if (ctx->timing_driven) + if (ctx->timing_driven && int(ni->users.size()) < cfg.timingFanoutThresh) for (size_t i = 0; i < ni->users.size(); i++) net_arc_tcost[ni->udata][i] = get_timing_cost(ni, i); } @@ -806,7 +806,7 @@ class SAPlacer mc.bounds_changed_nets.push_back(pn->udata); mc.already_bounds_changed[pn->udata] = true; } - if (ctx->timing_driven) { + if (ctx->timing_driven && int(pn->users.size()) < cfg.timingFanoutThresh) { // Output ports - all arcs change timing if (port.second.type == PORT_OUT) { int cc; @@ -913,6 +913,7 @@ Placer1Cfg::Placer1Cfg(Context *ctx) : Settings(ctx) minBelsForGridPick = get<int>("placer1/minBelsForGridPick", 64); budgetBased = get<bool>("placer1/budgetBased", false); startTemp = get<float>("placer1/startTemp", 1); + timingFanoutThresh = std::numeric_limits<int>::max(); } bool placer1(Context *ctx, Placer1Cfg cfg) |