diff options
Diffstat (limited to 'passes/techmap/dff2dffs.cc')
| -rw-r--r-- | passes/techmap/dff2dffs.cc | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/passes/techmap/dff2dffs.cc b/passes/techmap/dff2dffs.cc deleted file mode 100644 index 6c2cca4bc..000000000 --- a/passes/techmap/dff2dffs.cc +++ /dev/null @@ -1,165 +0,0 @@ -/* - * yosys -- Yosys Open SYnthesis Suite - * - * Copyright (C) 2012 Clifford Wolf <clifford@clifford.at> - * Copyright (C) 2018 David Shah <dave@ds0.me> - * - * Permission to use, copy, modify, and/or distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES - * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR - * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES - * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN - * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF - * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. - * - */ - -#include "kernel/yosys.h" -#include "kernel/sigtools.h" - -USING_YOSYS_NAMESPACE -PRIVATE_NAMESPACE_BEGIN - -struct Dff2dffsPass : public Pass { - Dff2dffsPass() : Pass("dff2dffs", "process sync set/reset with SR over CE priority") { } - void help() override - { - log("\n"); - log(" dff2dffs [options] [selection]\n"); - log("\n"); - log("Merge synchronous set/reset $_MUX_ cells to create $_SDFF_[NP][NP][01]_, to be run before\n"); - log("dff2dffe for SR over CE priority.\n"); - log("\n"); - log(" -match-init\n"); - log(" Disallow merging synchronous set/reset that has polarity opposite of the\n"); - log(" output wire's init attribute (if any).\n"); - log("\n"); - } - void execute(std::vector<std::string> args, RTLIL::Design *design) override - { - log_header(design, "Executing dff2dffs pass (merge synchronous set/reset into FF cells).\n"); - - bool match_init = false; - size_t argidx; - for (argidx = 1; argidx < args.size(); argidx++) - { - // if (args[argidx] == "-singleton") { - // singleton_mode = true; - // continue; - // } - if (args[argidx] == "-match-init") { - match_init = true; - continue; - } - break; - } - extra_args(args, argidx, design); - - pool<IdString> dff_types; - dff_types.insert(ID($_DFF_N_)); - dff_types.insert(ID($_DFF_P_)); - - for (auto module : design->selected_modules()) - { - log("Merging set/reset $_MUX_ cells into DFFs in %s.\n", log_id(module)); - - SigMap sigmap(module); - dict<SigBit, Cell*> sr_muxes; - vector<Cell*> ff_cells; - - for (auto cell : module->selected_cells()) - { - if (dff_types.count(cell->type)) { - ff_cells.push_back(cell); - continue; - } - - if (cell->type != ID($_MUX_)) - continue; - - SigBit bit_a = sigmap(cell->getPort(ID::A)); - SigBit bit_b = sigmap(cell->getPort(ID::B)); - - if (bit_a.wire == nullptr || bit_b.wire == nullptr) - sr_muxes[sigmap(cell->getPort(ID::Y))] = cell; - } - - for (auto cell : ff_cells) - { - SigSpec sig_d = cell->getPort(ID::D); - - if (GetSize(sig_d) < 1) - continue; - - SigBit bit_d = sigmap(sig_d[0]); - - if (sr_muxes.count(bit_d) == 0) - continue; - - Cell *mux_cell = sr_muxes.at(bit_d); - SigBit bit_a = sigmap(mux_cell->getPort(ID::A)); - SigBit bit_b = sigmap(mux_cell->getPort(ID::B)); - SigBit bit_s = sigmap(mux_cell->getPort(ID::S)); - - SigBit sr_val, sr_sig; - bool invert_sr; - sr_sig = bit_s; - if (bit_a.wire == nullptr) { - bit_d = bit_b; - sr_val = bit_a; - invert_sr = true; - } else { - log_assert(bit_b.wire == nullptr); - bit_d = bit_a; - sr_val = bit_b; - invert_sr = false; - } - - if (match_init) { - SigBit bit_q = cell->getPort(ID::Q); - if (bit_q.wire) { - auto it = bit_q.wire->attributes.find(ID::init); - if (it != bit_q.wire->attributes.end()) { - auto init_val = it->second[bit_q.offset]; - if (init_val == State::S1 && sr_val != State::S1) - continue; - if (init_val == State::S0 && sr_val != State::S0) - continue; - } - } - } - - log(" Merging %s (A=%s, B=%s, S=%s) into %s (%s).\n", log_id(mux_cell), - log_signal(bit_a), log_signal(bit_b), log_signal(bit_s), log_id(cell), log_id(cell->type)); - - if (sr_val == State::S1) { - if (cell->type == ID($_DFF_N_)) { - if (invert_sr) cell->type = ID($_SDFF_NN1_); - else cell->type = ID($_SDFF_NP1_); - } else { - log_assert(cell->type == ID($_DFF_P_)); - if (invert_sr) cell->type = ID($_SDFF_PN1_); - else cell->type = ID($_SDFF_PP1_); - } - } else { - if (cell->type == ID($_DFF_N_)) { - if (invert_sr) cell->type = ID($_SDFF_NN0_); - else cell->type = ID($_SDFF_NP0_); - } else { - log_assert(cell->type == ID($_DFF_P_)); - if (invert_sr) cell->type = ID($_SDFF_PN0_); - else cell->type = ID($_SDFF_PP0_); - } - } - cell->setPort(ID::R, sr_sig); - cell->setPort(ID::D, bit_d); - } - } - } -} Dff2dffsPass; - -PRIVATE_NAMESPACE_END |