diff options
| -rw-r--r-- | ice40/place_legaliser.cc | 42 |
1 files changed, 40 insertions, 2 deletions
diff --git a/ice40/place_legaliser.cc b/ice40/place_legaliser.cc index 011c424c..83316d6e 100644 --- a/ice40/place_legaliser.cc +++ b/ice40/place_legaliser.cc @@ -34,7 +34,7 @@ std::vector<std::vector<CellInfo *>> find_chains(const Context *ctx, F1 cell_typ { std::set<IdString> chained; std::vector<std::vector<CellInfo *>> chains; - for (auto cell : ctx->cells) { + for (auto cell : sorted(ctx->cells)) { if (chained.find(cell.first) != chained.end()) continue; CellInfo *ci = cell.second; @@ -59,7 +59,45 @@ std::vector<std::vector<CellInfo *>> find_chains(const Context *ctx, F1 cell_typ } } return chains; -}; +} + +static void get_chain_midpoint(const Context *ctx, const std::vector<CellInfo *> &chain, float &x, float &y) { + float total_x = 0, total_y = 0; + int N = 0; + for (auto cell : chain) { + if (cell->bel == BelId()) + continue; + int bel_x, bel_y; + bool bel_gb; + ctx->estimatePosition(cell->bel, bel_x, bel_y, bel_gb); + total_x += bel_x; + total_y += bel_y; + N++; + } + assert(N > 0); + x = total_x / N; + y = total_y / N; +} + +static CellInfo *make_carry_pass_out(Context *ctx, PortInfo &cout_port) { + assert(cout_port.net != nullptr); + CellInfo *lc = create_ice_cell(ctx, ctx->id("ICESTORM_LC")); + lc->params[ctx->id("LUT_INIT")] = "65280"; // 0xff00: O = I3 + lc->ports.at(ctx->id("O")).net = cout_port.net; + NetInfo *co_i3_net = new NetInfo(); + co_i3_net->name = ctx->id(lc->name.str(ctx) + "$I3"); + co_i3_net->driver = cout_port.net->driver; + PortRef i3_r; + i3_r.port = ctx->id("I3"); + i3_r.cell = lc; + co_i3_net->users.push_back(i3_r); + PortRef o_r; + o_r.port = ctx->id("O"); + o_r.cell = lc; + cout_port.net->driver = o_r; + lc->ports.at(ctx->id("I3")).net = co_i3_net; + return lc; +} bool legalise_design(Context *ctx) { |