ice40: Working on the placement legaliser
Signed-off-by: David Shah <davey1576@gmail.com>
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@ -66,11 +66,11 @@ std::vector<CellChain> find_chains(const Context *ctx, F1 cell_type_predicate, F
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return chains;
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}
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static void get_chain_midpoint(const Context *ctx, const std::vector<CellInfo *> &chain, float &x, float &y)
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static void get_chain_midpoint(const Context *ctx, const CellChain &chain, float &x, float &y)
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{
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float total_x = 0, total_y = 0;
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int N = 0;
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for (auto cell : chain) {
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for (auto cell : chain.cells) {
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if (cell->bel == BelId())
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continue;
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int bel_x, bel_y;
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@ -89,6 +89,7 @@ class PlacementLegaliser
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{
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public:
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PlacementLegaliser(Context *ctx) : ctx(ctx){};
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bool legalise()
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{
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bool legalised_carries = legalise_carries();
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@ -98,6 +99,27 @@ class PlacementLegaliser
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}
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private:
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void init_logic_cells()
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{
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for (auto bel : ctx->getBels()) {
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// Initialise the logic bels vector with unavailable invalid bels, dimensions [0..width][0..height[0..7]
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logic_bels.resize(ctx->chip_info->width + 1,
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std::vector<std::vector<std::pair<BelId, bool>>>(
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ctx->chip_info->height + 1,
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std::vector<std::pair<BelId, bool>>(8, std::make_pair(BelId(), true))));
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if (ctx->getBelType(bel) == TYPE_ICESTORM_LC) {
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// Using the non-standard API here to get (x, y, z) rather than just (x, y)
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auto bi = ctx->chip_info->bel_data[bel.index];
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int x = bi.x, y = bi.y, z = bi.z;
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IdString cell = ctx->getBoundBelCell(bel);
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if (cell != IdString() && ctx->cells.at(cell)->belStrength >= STRENGTH_FIXED)
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logic_bels.at(x).at(y).at(z) = std::make_pair(bel, true);
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else
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logic_bels.at(x).at(y).at(z) = std::make_pair(bel, false);
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}
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}
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}
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bool legalise_carries()
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{
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std::vector<CellChain> carry_chains = find_chains(
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@ -108,13 +130,28 @@ class PlacementLegaliser
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[](const Context *ctx, const CellInfo *cell) {
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return net_only_drives(ctx, cell->ports.at(ctx->id("COUT")).net, is_lc, ctx->id("CIN"), false);
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});
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for (auto chain : carry_chains) {
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int width = ctx->chip_info->width, height = ctx->chip_info->height;
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for (auto &base_chain : carry_chains) {
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std::vector<CellChain> split_chains = split_carry_chain(base_chain);
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for (auto &chain : split_chains) {
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float mid_x, mid_y;
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get_chain_midpoint(ctx, chain, mid_x, mid_y);
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float base_x = mid_x, base_y = mid_y - (chain.cells.size() / 16.0f);
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// Find Bel meeting requirements closest to the target base
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}
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}
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return true;
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}
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// Find Bel closest to a location, meeting chain requirements
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BelId find_closest_bel(float x, float y, int chain_size)
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{
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// TODO
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return BelId();
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}
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// Split a carry chain into multiple legal chains
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std::vector<CellChain> split_carry_chain(Context *ctx, CellChain &carryc)
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std::vector<CellChain> split_carry_chain(CellChain &carryc)
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{
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bool start_of_chain = true;
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std::vector<CellChain> chains;
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@ -213,6 +250,8 @@ class PlacementLegaliser
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Context *ctx;
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std::unordered_set<IdString> rippedCells;
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std::unordered_set<IdString> createdCells;
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// Go from X and Y position to logic cells, setting occupied to true if a Bel is unavailable
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std::vector<std::vector<std::vector<std::pair<BelId, bool>>>> logic_bels;
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};
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bool legalise_design(Context *ctx)
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