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| author | David Shah <davey1576@gmail.com> | 2018-10-01 18:19:56 +0100 |
|---|---|---|
| committer | David Shah <davey1576@gmail.com> | 2018-10-01 18:19:56 +0100 |
| commit | fd4498736ed4ddd0810913b03dd7f772072b4180 (patch) | |
| tree | 2583d3d55b85f98a84f854acc4b72c28e412b94d | |
| parent | 2c96d4770df064eb02050b0f94de5b45d8724b4c (diff) | |
| download | nextpnr-fd4498736ed4ddd0810913b03dd7f772072b4180.tar.gz nextpnr-fd4498736ed4ddd0810913b03dd7f772072b4180.tar.bz2 nextpnr-fd4498736ed4ddd0810913b03dd7f772072b4180.zip | |
ecp5: Fix packing of FFs into carry/DRAM slices
Signed-off-by: David Shah <davey1576@gmail.com>
| -rw-r--r-- | ecp5/pack.cc | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/ecp5/pack.cc b/ecp5/pack.cc index 53203e33..3ba6e238 100644 --- a/ecp5/pack.cc +++ b/ecp5/pack.cc @@ -496,6 +496,7 @@ class Ecp5Packer std::vector<std::vector<CellInfo *>> packed_chains; // Chain packing + std::vector<std::tuple<CellInfo *, CellInfo *, int>> ff_packing; for (auto &chain : all_chains) { int cell_count = 0; std::vector<CellInfo *> tile_ffs; @@ -513,7 +514,7 @@ class Ecp5Packer if (f0net != nullptr) { ff0 = net_only_drives(ctx, f0net, is_ff, ctx->id("DI"), false); if (ff0 != nullptr && can_add_ff_to_tile(tile_ffs, ff0)) { - ff_to_slice(ctx, ff0, slice.get(), 0, true); + ff_packing.push_back(std::make_tuple(ff0, slice.get(), 0)); tile_ffs.push_back(ff0); packed_cells.insert(ff0->name); } @@ -525,7 +526,7 @@ class Ecp5Packer ff1 = net_only_drives(ctx, f1net, is_ff, ctx->id("DI"), false); if (ff1 != nullptr && (ff0 == nullptr || can_pack_ffs(ff0, ff1)) && can_add_ff_to_tile(tile_ffs, ff1)) { - ff_to_slice(ctx, ff1, slice.get(), 1, true); + ff_packing.push_back(std::make_tuple(ff1, slice.get(), 1)); tile_ffs.push_back(ff1); packed_cells.insert(ff1->name); } @@ -538,6 +539,9 @@ class Ecp5Packer packed_chains.push_back(packed_chain); } + for (auto ff : ff_packing) + ff_to_slice(ctx, std::get<0>(ff), std::get<1>(ff), std::get<2>(ff), true); + // Relative chain placement for (auto &chain : packed_chains) { chain.at(0)->constr_abs_z = true; @@ -586,6 +590,7 @@ class Ecp5Packer disconnect_port(ctx, ci, ctx->id("RAD[3]")); // Attempt to pack FFs into RAM slices + std::vector<std::tuple<CellInfo *, CellInfo *, int>> ff_packing; std::vector<CellInfo *> tile_ffs; for (auto slice : {ram0_slice.get(), ram1_slice.get()}) { CellInfo *ff0 = nullptr; @@ -593,7 +598,7 @@ class Ecp5Packer if (f0net != nullptr) { ff0 = net_only_drives(ctx, f0net, is_ff, ctx->id("DI"), false); if (ff0 != nullptr && can_add_ff_to_tile(tile_ffs, ff0)) { - ff_to_slice(ctx, ff0, slice, 0, true); + ff_packing.push_back(std::make_tuple(ff0, slice, 0)); tile_ffs.push_back(ff0); packed_cells.insert(ff0->name); } @@ -605,13 +610,16 @@ class Ecp5Packer ff1 = net_only_drives(ctx, f1net, is_ff, ctx->id("DI"), false); if (ff1 != nullptr && (ff0 == nullptr || can_pack_ffs(ff0, ff1)) && can_add_ff_to_tile(tile_ffs, ff1)) { - ff_to_slice(ctx, ff1, slice, 1, true); + ff_packing.push_back(std::make_tuple(ff1, slice, 1)); tile_ffs.push_back(ff1); packed_cells.insert(ff1->name); } } } + for (auto ff : ff_packing) + ff_to_slice(ctx, std::get<0>(ff), std::get<1>(ff), std::get<2>(ff), true); + // Setup placement constraints ram0_slice->constr_abs_z = true; ram0_slice->constr_z = 0; |