place_sa: Refactor to put SA placer in its own class
Signed-off-by: David Shah <davey1576@gmail.com>
This commit is contained in:
David Shah
parent
7975afc30f
commit
1b3432b701
@ -42,10 +42,195 @@
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NEXTPNR_NAMESPACE_BEGIN
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// Initial random placement
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static void place_initial(Context *ctx, CellInfo *cell,
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PlaceValidityChecker *checker)
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class SAPlacer
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{
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public:
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SAPlacer(Context *ctx) : ctx(ctx)
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{
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checker = new PlaceValidityChecker(ctx);
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int num_bel_types = 0;
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for (auto bel : ctx->getBels()) {
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int x, y;
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ctx->estimatePosition(bel, x, y);
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BelType type = ctx->getBelType(bel);
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int type_idx;
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if (bel_types.find(type) == bel_types.end()) {
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type_idx = num_bel_types++;
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bel_types[type] = type_idx;
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} else {
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type_idx = bel_types.at(type);
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}
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if (int(fast_bels.size()) < type_idx + 1)
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fast_bels.resize(type_idx + 1);
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if (int(fast_bels.at(type_idx).size()) < (x + 1))
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fast_bels.at(type_idx).resize(x + 1);
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if (int(fast_bels.at(type_idx).at(x).size()) < (y + 1))
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fast_bels.at(type_idx).at(x).resize(y + 1);
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max_x = std::max(max_x, x);
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max_y = std::max(max_y, y);
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fast_bels.at(type_idx).at(x).at(y).push_back(bel);
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}
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diameter = std::max(max_x, max_y) + 1;
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}
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bool place()
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{
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size_t placed_cells = 0;
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// Initial constraints placer
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for (auto cell_entry : ctx->cells) {
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CellInfo *cell = cell_entry.second;
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auto loc = cell->attrs.find(ctx->id("BEL"));
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if (loc != cell->attrs.end()) {
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std::string loc_name = loc->second;
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BelId bel = ctx->getBelByName(ctx->id(loc_name));
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if (bel == BelId()) {
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log_error(
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"No Bel named \'%s\' located for "
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"this chip (processing BEL attribute on \'%s\')\n",
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loc_name.c_str(), cell->name.c_str(ctx));
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}
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BelType bel_type = ctx->getBelType(bel);
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if (bel_type != ctx->belTypeFromId(cell->type)) {
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log_error("Bel \'%s\' of type \'%s\' does not match cell "
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"\'%s\' of type \'%s\'",
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loc_name.c_str(),
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ctx->belTypeToId(bel_type).c_str(ctx),
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cell->name.c_str(ctx), cell->type.c_str(ctx));
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}
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cell->bel = bel;
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ctx->bindBel(bel, cell->name);
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locked_bels.insert(bel);
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placed_cells++;
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}
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}
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int constr_placed_cells = placed_cells;
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log_info("Placed %d cells based on constraints.\n", int(placed_cells));
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// Sort to-place cells for deterministic initial placement
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std::vector<CellInfo *> autoplaced;
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for (auto cell : ctx->cells) {
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CellInfo *ci = cell.second;
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if (ci->bel == BelId()) {
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autoplaced.push_back(cell.second);
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}
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}
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std::sort(autoplaced.begin(), autoplaced.end(),
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[](CellInfo *a, CellInfo *b) { return a->name < b->name; });
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ctx->shuffle(autoplaced);
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// Place cells randomly initially
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log_info("Creating initial placement for remaining %d cells.\n",
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int(autoplaced.size()));
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for (auto cell : autoplaced) {
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place_initial(cell);
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placed_cells++;
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if ((placed_cells - constr_placed_cells) % 500 == 0)
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log_info(" initial placement placed %d/%d cells\n",
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int(placed_cells - constr_placed_cells),
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int(autoplaced.size()));
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}
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if ((placed_cells - constr_placed_cells) % 500 != 0)
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log_info(" initial placement placed %d/%d cells\n",
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int(placed_cells - constr_placed_cells),
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int(autoplaced.size()));
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log_info("Running simulated annealing placer.\n");
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// Calculate wirelength after initial placement
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curr_wirelength = 0;
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for (auto net : ctx->nets) {
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float wl = get_wirelength(net.second);
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wirelengths[net.second] = wl;
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curr_wirelength += wl;
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}
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int n_no_progress = 0;
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double avg_wirelength = curr_wirelength;
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temp = 10000;
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// Main simulated annealing loop
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for (int iter = 1;; iter++) {
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n_move = n_accept = 0;
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improved = false;
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if (iter % 5 == 0 || iter == 1)
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log_info(" at iteration #%d: temp = %f, wire length = %f\n",
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iter, temp, curr_wirelength);
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for (int m = 0; m < 15; ++m) {
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// Loop through all automatically placed cells
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for (auto cell : autoplaced) {
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// Find another random Bel for this cell
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BelId try_bel = random_bel_for_cell(cell);
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// If valid, try and swap to a new position and see if
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// the new position is valid/worthwhile
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if (try_bel != BelId() && try_bel != cell->bel)
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try_swap_position(cell, try_bel);
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}
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}
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// Heuristic to improve placement on the 8k
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if (improved)
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n_no_progress = 0;
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else
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n_no_progress++;
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if (temp <= 1e-3 && n_no_progress >= 5) {
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if (iter % 5 != 0)
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log_info(
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" at iteration #%d: temp = %f, wire length = %f\n",
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iter, temp, curr_wirelength);
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break;
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}
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double Raccept = double(n_accept) / double(n_move);
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int M = std::max(max_x, max_y) + 1;
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double upper = 0.6, lower = 0.4;
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if (curr_wirelength < 0.95 * avg_wirelength) {
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avg_wirelength = 0.8 * avg_wirelength + 0.2 * curr_wirelength;
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} else {
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if (Raccept >= 0.8) {
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temp *= 0.7;
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} else if (Raccept > upper) {
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if (diameter < M)
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diameter++;
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else
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temp *= 0.9;
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} else if (Raccept > lower) {
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temp *= 0.95;
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} else {
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// Raccept < 0.3
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if (diameter > 1)
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diameter--;
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else
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temp *= 0.8;
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}
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}
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}
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// Final post-pacement validitiy check
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for (auto bel : ctx->getBels()) {
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if (!checker->isBelLocationValid(bel)) {
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std::string cell_text = "no cell";
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IdString cell = ctx->getBelCell(bel, false);
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if (cell != IdString())
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cell_text = std::string("cell '") + cell.str(ctx) + "'";
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log_error("post-placement validity check failed for Bel '%s' "
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"(%s)",
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ctx->getBelName(bel).c_str(ctx), cell_text.c_str());
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}
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}
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return true;
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}
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private:
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// Initial random placement
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void place_initial(CellInfo *cell)
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{
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bool all_placed = false;
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int iters = 25;
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while (!all_placed) {
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@ -97,26 +282,11 @@ static void place_initial(Context *ctx, CellInfo *cell,
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cell->attrs[ctx->id("BEL")] = ctx->getBelName(cell->bel).str(ctx);
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cell = ripup_target;
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}
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}
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}
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// Stores the state of the SA placer
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struct SAState
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{
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std::unordered_map<NetInfo *, float> wirelengths;
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float curr_wirelength = std::numeric_limits<float>::infinity();
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float temp = 1000;
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bool improved = false;
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int n_move, n_accept;
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int diameter = 35;
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std::unordered_map<BelType, int> bel_types;
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std::vector<std::vector<std::vector<std::vector<BelId>>>> fast_bels;
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std::unordered_set<BelId> locked_bels;
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PlaceValidityChecker *checker;
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};
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// Get the total estimated wirelength for a net
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static float get_wirelength(Context *ctx, NetInfo *net)
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{
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// Get the total estimated wirelength for a net
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float get_wirelength(NetInfo *net)
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{
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float wirelength = 0;
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int driver_x = 0, driver_y = 0;
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bool consider_driver = false;
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@ -127,8 +297,8 @@ static float get_wirelength(Context *ctx, NetInfo *net)
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return 0;
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consider_driver =
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ctx->estimatePosition(driver_cell->bel, driver_x, driver_y);
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WireId drv_wire = ctx->getWireBelPin(driver_cell->bel,
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ctx->portPinFromId(net->driver.port));
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WireId drv_wire = ctx->getWireBelPin(
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driver_cell->bel, ctx->portPinFromId(net->driver.port));
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if (!consider_driver)
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return 0;
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for (auto load : net->users) {
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@ -138,19 +308,18 @@ static float get_wirelength(Context *ctx, NetInfo *net)
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if (load_cell->bel == BelId())
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continue;
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// ctx->estimatePosition(load_cell->bel, load_x, load_y);
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WireId user_wire = ctx->getWireBelPin(load_cell->bel,
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ctx->portPinFromId(load.port));
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WireId user_wire = ctx->getWireBelPin(
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load_cell->bel, ctx->portPinFromId(load.port));
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// wirelength += std::abs(load_x - driver_x) + std::abs(load_y -
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// driver_y);
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wirelength += ctx->estimateDelay(drv_wire, user_wire);
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}
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return wirelength;
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}
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}
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// Attempt a SA position swap, return true on success or false on failure
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static bool try_swap_position(Context *ctx, CellInfo *cell, BelId newBel,
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SAState &state)
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{
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// Attempt a SA position swap, return true on success or false on failure
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bool try_swap_position(CellInfo *cell, BelId newBel)
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{
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static std::unordered_set<NetInfo *> update;
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static std::vector<std::pair<NetInfo *, float>> new_lengths;
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new_lengths.clear();
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@ -181,8 +350,8 @@ static bool try_swap_position(Context *ctx, CellInfo *cell, BelId newBel,
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ctx->bindBel(oldBel, other_cell->name);
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}
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if (!state.checker->isBelLocationValid(newBel) ||
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((other != IdString() && !state.checker->isBelLocationValid(oldBel)))) {
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if (!checker->isBelLocationValid(newBel) ||
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((other != IdString() && !checker->isBelLocationValid(oldBel)))) {
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ctx->unbindBel(newBel);
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if (other != IdString())
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ctx->unbindBel(oldBel);
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@ -193,36 +362,35 @@ static bool try_swap_position(Context *ctx, CellInfo *cell, BelId newBel,
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if (other != IdString())
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other_cell->bel = oldBel;
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new_wirelength = state.curr_wirelength;
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new_wirelength = curr_wirelength;
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// Recalculate wirelengths for all nets touched by the peturbation
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for (auto net : update) {
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new_wirelength -= state.wirelengths.at(net);
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float net_new_wl = get_wirelength(ctx, net);
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new_wirelength -= wirelengths.at(net);
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float net_new_wl = get_wirelength(net);
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new_wirelength += net_new_wl;
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new_lengths.push_back(std::make_pair(net, net_new_wl));
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}
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delta = new_wirelength - state.curr_wirelength;
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state.n_move++;
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delta = new_wirelength - curr_wirelength;
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n_move++;
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// SA acceptance criterea
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if (delta < 0 ||
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(state.temp > 1e-6 &&
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(ctx->rng() / float(0x3fffffff)) <= std::exp(-delta / state.temp))) {
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state.n_accept++;
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if (delta < 0 || (temp > 1e-6 && (ctx->rng() / float(0x3fffffff)) <=
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std::exp(-delta / temp))) {
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n_accept++;
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if (delta < 0)
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state.improved = true;
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improved = true;
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} else {
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if (other != IdString())
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ctx->unbindBel(oldBel);
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ctx->unbindBel(newBel);
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goto swap_fail;
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}
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state.curr_wirelength = new_wirelength;
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curr_wirelength = new_wirelength;
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for (auto new_wl : new_lengths)
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state.wirelengths.at(new_wl.first) = new_wl.second;
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wirelengths.at(new_wl.first) = new_wl.second;
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return true;
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swap_fail:
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swap_fail:
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ctx->bindBel(oldBel, cell->name);
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cell->bel = oldBel;
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if (other != IdString()) {
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@ -230,214 +398,50 @@ swap_fail:
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other_cell->bel = newBel;
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}
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return false;
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}
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}
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// Find a random Bel of the correct type for a cell, within the specified
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// diameter
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BelId random_bel_for_cell(Context *ctx, CellInfo *cell, SAState &state)
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{
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// Find a random Bel of the correct type for a cell, within the specified
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// diameter
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BelId random_bel_for_cell(CellInfo *cell)
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{
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BelType targetType = ctx->belTypeFromId(cell->type);
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int x = 0, y = 0;
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ctx->estimatePosition(cell->bel, x, y);
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while (true) {
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int nx = ctx->rng(2 * state.diameter + 1) +
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std::max(x - state.diameter, 0);
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int ny = ctx->rng(2 * state.diameter + 1) +
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std::max(y - state.diameter, 0);
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int beltype_idx = state.bel_types.at(targetType);
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if (nx >= int(state.fast_bels.at(beltype_idx).size()))
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int nx = ctx->rng(2 * diameter + 1) + std::max(x - diameter, 0);
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int ny = ctx->rng(2 * diameter + 1) + std::max(y - diameter, 0);
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int beltype_idx = bel_types.at(targetType);
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if (nx >= int(fast_bels.at(beltype_idx).size()))
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continue;
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if (ny >= int(state.fast_bels.at(beltype_idx).at(nx).size()))
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if (ny >= int(fast_bels.at(beltype_idx).at(nx).size()))
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continue;
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const auto &fb = state.fast_bels.at(beltype_idx).at(nx).at(ny);
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const auto &fb = fast_bels.at(beltype_idx).at(nx).at(ny);
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if (fb.size() == 0)
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continue;
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BelId bel = fb.at(ctx->rng(int(fb.size())));
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if (state.locked_bels.find(bel) != state.locked_bels.end())
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if (locked_bels.find(bel) != locked_bels.end())
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continue;
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return bel;
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}
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}
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}
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Context *ctx;
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std::unordered_map<NetInfo *, float> wirelengths;
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float curr_wirelength = std::numeric_limits<float>::infinity();
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float temp = 1000;
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bool improved = false;
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int n_move, n_accept;
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int diameter = 35, max_x = 1, max_y = 1;
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std::unordered_map<BelType, int> bel_types;
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std::vector<std::vector<std::vector<std::vector<BelId>>>> fast_bels;
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std::unordered_set<BelId> locked_bels;
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PlaceValidityChecker *checker;
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};
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bool place_design_sa(Context *ctx)
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{
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SAState state;
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state.checker = new PlaceValidityChecker(ctx);
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size_t placed_cells = 0;
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std::queue<CellInfo *> visit_cells;
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// Initial constraints placer
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for (auto cell_entry : ctx->cells) {
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CellInfo *cell = cell_entry.second;
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auto loc = cell->attrs.find(ctx->id("BEL"));
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if (loc != cell->attrs.end()) {
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std::string loc_name = loc->second;
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BelId bel = ctx->getBelByName(ctx->id(loc_name));
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if (bel == BelId()) {
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log_error("No Bel named \'%s\' located for "
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"this chip (processing BEL attribute on \'%s\')\n",
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loc_name.c_str(), cell->name.c_str(ctx));
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}
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BelType bel_type = ctx->getBelType(bel);
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if (bel_type != ctx->belTypeFromId(cell->type)) {
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log_error("Bel \'%s\' of type \'%s\' does not match cell "
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"\'%s\' of type \'%s\'",
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loc_name.c_str(),
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ctx->belTypeToId(bel_type).c_str(ctx),
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cell->name.c_str(ctx), cell->type.c_str(ctx));
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}
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cell->bel = bel;
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ctx->bindBel(bel, cell->name);
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state.locked_bels.insert(bel);
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placed_cells++;
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visit_cells.push(cell);
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}
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}
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int constr_placed_cells = placed_cells;
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log_info("Placed %d cells based on constraints.\n", int(placed_cells));
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// Sort to-place cells for deterministic initial placement
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std::vector<CellInfo *> autoplaced;
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for (auto cell : ctx->cells) {
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CellInfo *ci = cell.second;
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if (ci->bel == BelId()) {
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autoplaced.push_back(cell.second);
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}
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}
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std::sort(autoplaced.begin(), autoplaced.end(),
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[](CellInfo *a, CellInfo *b) { return a->name < b->name; });
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ctx->shuffle(autoplaced);
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// Place cells randomly initially
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log_info("Creating initial placement for remaining %d cells.\n",
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int(autoplaced.size()));
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for (auto cell : autoplaced) {
|
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place_initial(ctx, cell, state.checker);
|
||||
placed_cells++;
|
||||
if ((placed_cells - constr_placed_cells) % 500 == 0)
|
||||
log_info(" initial placement placed %d/%d cells\n",
|
||||
int(placed_cells - constr_placed_cells),
|
||||
int(autoplaced.size()));
|
||||
}
|
||||
if ((placed_cells - constr_placed_cells) % 500 != 0)
|
||||
log_info(" initial placement placed %d/%d cells\n",
|
||||
int(placed_cells - constr_placed_cells),
|
||||
int(autoplaced.size()));
|
||||
|
||||
log_info("Running simulated annealing placer.\n");
|
||||
|
||||
// Build up a fast position/type to Bel lookup table
|
||||
int max_x = 0, max_y = 0;
|
||||
int bel_types = 0;
|
||||
for (auto bel : ctx->getBels()) {
|
||||
int x, y;
|
||||
ctx->estimatePosition(bel, x, y);
|
||||
BelType type = ctx->getBelType(bel);
|
||||
int type_idx;
|
||||
if (state.bel_types.find(type) == state.bel_types.end()) {
|
||||
type_idx = bel_types++;
|
||||
state.bel_types[type] = type_idx;
|
||||
} else {
|
||||
type_idx = state.bel_types.at(type);
|
||||
}
|
||||
if (int(state.fast_bels.size()) < type_idx + 1)
|
||||
state.fast_bels.resize(type_idx + 1);
|
||||
if (int(state.fast_bels.at(type_idx).size()) < (x + 1))
|
||||
state.fast_bels.at(type_idx).resize(x + 1);
|
||||
if (int(state.fast_bels.at(type_idx).at(x).size()) < (y + 1))
|
||||
state.fast_bels.at(type_idx).at(x).resize(y + 1);
|
||||
max_x = std::max(max_x, x);
|
||||
max_y = std::max(max_y, y);
|
||||
state.fast_bels.at(type_idx).at(x).at(y).push_back(bel);
|
||||
}
|
||||
state.diameter = std::max(max_x, max_y) + 1;
|
||||
|
||||
// Calculate wirelength after initial placement
|
||||
state.curr_wirelength = 0;
|
||||
for (auto net : ctx->nets) {
|
||||
float wl = get_wirelength(ctx, net.second);
|
||||
state.wirelengths[net.second] = wl;
|
||||
state.curr_wirelength += wl;
|
||||
}
|
||||
|
||||
int n_no_progress = 0;
|
||||
double avg_wirelength = state.curr_wirelength;
|
||||
state.temp = 10000;
|
||||
|
||||
// Main simulated annealing loop
|
||||
for (int iter = 1;; iter++) {
|
||||
state.n_move = state.n_accept = 0;
|
||||
state.improved = false;
|
||||
|
||||
if (iter % 5 == 0 || iter == 1)
|
||||
log_info(" at iteration #%d: temp = %f, wire length = %f\n", iter,
|
||||
state.temp, state.curr_wirelength);
|
||||
|
||||
for (int m = 0; m < 15; ++m) {
|
||||
// Loop through all automatically placed cells
|
||||
for (auto cell : autoplaced) {
|
||||
// Find another random Bel for this cell
|
||||
BelId try_bel = random_bel_for_cell(ctx, cell, state);
|
||||
// If valid, try and swap to a new position and see if
|
||||
// the new position is valid/worthwhile
|
||||
if (try_bel != BelId() && try_bel != cell->bel)
|
||||
try_swap_position(ctx, cell, try_bel, state);
|
||||
}
|
||||
}
|
||||
// Heuristic to improve placement on the 8k
|
||||
if (state.improved) {
|
||||
n_no_progress = 0;
|
||||
// std::cout << "improved\n";
|
||||
} else
|
||||
++n_no_progress;
|
||||
|
||||
if (state.temp <= 1e-3 && n_no_progress >= 5) {
|
||||
if (iter % 5 != 0)
|
||||
log_info(" at iteration #%d: temp = %f, wire length = %f\n",
|
||||
iter, state.temp, state.curr_wirelength);
|
||||
break;
|
||||
}
|
||||
|
||||
double Raccept = (double)state.n_accept / (double)state.n_move;
|
||||
|
||||
int M = std::max(max_x, max_y) + 1;
|
||||
|
||||
double upper = 0.6, lower = 0.4;
|
||||
|
||||
if (state.curr_wirelength < 0.95 * avg_wirelength)
|
||||
avg_wirelength = 0.8 * avg_wirelength + 0.2 * state.curr_wirelength;
|
||||
else {
|
||||
if (Raccept >= 0.8) {
|
||||
state.temp *= 0.7;
|
||||
} else if (Raccept > upper) {
|
||||
if (state.diameter < M)
|
||||
++state.diameter;
|
||||
else
|
||||
state.temp *= 0.9;
|
||||
} else if (Raccept > lower) {
|
||||
state.temp *= 0.95;
|
||||
} else {
|
||||
// Raccept < 0.3
|
||||
if (state.diameter > 1)
|
||||
--state.diameter;
|
||||
else
|
||||
state.temp *= 0.8;
|
||||
}
|
||||
}
|
||||
}
|
||||
for (auto bel : ctx->getBels()) {
|
||||
if (!state.checker->isBelLocationValid(bel)) {
|
||||
std::string cell_text = "no cell";
|
||||
IdString cell = ctx->getBelCell(bel, false);
|
||||
if (cell != IdString())
|
||||
cell_text = std::string("cell '") + cell.str(ctx) + "'";
|
||||
log_error("post-placement validity check failed for Bel '%s' (%s)",
|
||||
ctx->getBelName(bel).c_str(ctx), cell_text.c_str());
|
||||
}
|
||||
}
|
||||
delete state.checker;
|
||||
SAPlacer placer(ctx);
|
||||
placer.place();
|
||||
return true;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user