From acd8c5c205ca9292ff5e7546cf748cb1715f1ec0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcelina=20Ko=C5=9Bcielnicka?= <mwk@0x04.net>
Date: Wed, 15 Jul 2020 02:54:40 +0200
Subject: [PATCH 1/4] Remove now-redundant opt_rmdff pass.
---
passes/opt/Makefile.inc | 1 -
passes/opt/opt_rmdff.cc | 711 ----------------------------------------
2 files changed, 712 deletions(-)
delete mode 100644 passes/opt/opt_rmdff.cc
diff --git a/passes/opt/Makefile.inc b/passes/opt/Makefile.inc
index 64fee76b3..4ae9b8895 100644
--- a/passes/opt/Makefile.inc
+++ b/passes/opt/Makefile.inc
@@ -4,7 +4,6 @@ OBJS += passes/opt/opt_merge.o
OBJS += passes/opt/opt_mem.o
OBJS += passes/opt/opt_muxtree.o
OBJS += passes/opt/opt_reduce.o
-OBJS += passes/opt/opt_rmdff.o
OBJS += passes/opt/opt_dff.o
OBJS += passes/opt/opt_share.o
OBJS += passes/opt/opt_clean.o
diff --git a/passes/opt/opt_rmdff.cc b/passes/opt/opt_rmdff.cc
deleted file mode 100644
index 8f7628a4a..000000000
--- a/passes/opt/opt_rmdff.cc
+++ /dev/null
@@ -1,711 +0,0 @@
-/*
- * yosys -- Yosys Open SYnthesis Suite
- *
- * Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
- *
- * 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/log.h"
-#include "kernel/register.h"
-#include "kernel/rtlil.h"
-#include "kernel/satgen.h"
-#include "kernel/sigtools.h"
-#include <stdio.h>
-#include <stdlib.h>
-
-USING_YOSYS_NAMESPACE
-PRIVATE_NAMESPACE_BEGIN
-
-SigMap assign_map, dff_init_map;
-SigSet<RTLIL::Cell*> mux_drivers;
-dict<SigBit, RTLIL::Cell*> bit2driver;
-dict<SigBit, pool<SigBit>> init_attributes;
-
-bool keepdc;
-bool sat;
-
-void remove_init_attr(SigSpec sig)
-{
- for (auto bit : assign_map(sig))
- if (init_attributes.count(bit))
- for (auto wbit : init_attributes.at(bit))
- wbit.wire->attributes.at(ID::init)[wbit.offset] = State::Sx;
-}
-
-bool handle_dffsr(RTLIL::Module *mod, RTLIL::Cell *cell)
-{
- SigSpec sig_set, sig_clr;
- State pol_set, pol_clr;
-
- if (cell->hasPort(ID::S))
- sig_set = cell->getPort(ID::S);
-
- if (cell->hasPort(ID::R))
- sig_clr = cell->getPort(ID::R);
-
- if (cell->hasPort(ID::SET))
- sig_set = cell->getPort(ID::SET);
-
- if (cell->hasPort(ID::CLR))
- sig_clr = cell->getPort(ID::CLR);
-
- log_assert(GetSize(sig_set) == GetSize(sig_clr));
-
- if (cell->type.begins_with("$_DFFSR_")) {
- pol_set = cell->type[9] == 'P' ? State::S1 : State::S0;
- pol_clr = cell->type[10] == 'P' ? State::S1 : State::S0;
- } else
- if (cell->type.begins_with("$_DLATCHSR_")) {
- pol_set = cell->type[12] == 'P' ? State::S1 : State::S0;
- pol_clr = cell->type[13] == 'P' ? State::S1 : State::S0;
- } else
- if (cell->type.in(ID($dffsr), ID($dlatchsr))) {
- pol_set = cell->parameters[ID::SET_POLARITY].as_bool() ? State::S1 : State::S0;
- pol_clr = cell->parameters[ID::CLR_POLARITY].as_bool() ? State::S1 : State::S0;
- } else
- log_abort();
-
- State npol_set = pol_set == State::S0 ? State::S1 : State::S0;
- State npol_clr = pol_clr == State::S0 ? State::S1 : State::S0;
-
- SigSpec sig_d = cell->getPort(ID::D);
- SigSpec sig_q = cell->getPort(ID::Q);
-
- bool did_something = false;
- bool proper_sr = false;
- bool used_pol_set = false;
- bool used_pol_clr = false;
- bool hasreset = false;
- Const reset_val;
- SigSpec sig_reset;
-
- for (int i = 0; i < GetSize(sig_set); i++)
- {
- SigBit s = sig_set[i], c = sig_clr[i];
-
- if (s != npol_set || c != npol_clr)
- hasreset = true;
-
- if (s == pol_set || c == pol_clr)
- {
- log("Constantly %s Q bit %s for SR cell %s (%s) from module %s.\n",
- s == pol_set ? "set" : "cleared", log_signal(sig_q[i]),
- log_id(cell), log_id(cell->type), log_id(mod));
-
- remove_init_attr(sig_q[i]);
- mod->connect(sig_q[i], s == pol_set ? State::S1 : State::S0);
- sig_set.remove(i);
- sig_clr.remove(i);
- sig_d.remove(i);
- sig_q.remove(i--);
- did_something = true;
- continue;
- }
- if (sig_reset.empty() && s.wire != nullptr) sig_reset = s;
- if (sig_reset.empty() && c.wire != nullptr) sig_reset = c;
-
- if (s.wire != nullptr && s != sig_reset) proper_sr = true;
- if (c.wire != nullptr && c != sig_reset) proper_sr = true;
-
- if ((s.wire == nullptr) != (c.wire == nullptr)) {
- if (s.wire != nullptr) used_pol_set = true;
- if (c.wire != nullptr) used_pol_clr = true;
- reset_val.bits.push_back(c.wire == nullptr ? State::S1 : State::S0);
- } else
- proper_sr = true;
- }
-
- if (!hasreset)
- proper_sr = false;
-
- if (GetSize(sig_set) == 0)
- {
- log("Removing %s (%s) from module %s.\n", log_id(cell), log_id(cell->type), log_id(mod));
- mod->remove(cell);
- return true;
- }
-
- if (cell->type.in(ID($dffsr), ID($dlatchsr)))
- {
- cell->setParam(ID::WIDTH, GetSize(sig_d));
- cell->setPort(ID::SET, sig_set);
- cell->setPort(ID::CLR, sig_clr);
- cell->setPort(ID::D, sig_d);
- cell->setPort(ID::Q, sig_q);
- }
- else
- {
- cell->setPort(ID::S, sig_set);
- cell->setPort(ID::R, sig_clr);
- cell->setPort(ID::D, sig_d);
- cell->setPort(ID::Q, sig_q);
- }
-
- if (proper_sr)
- return did_something;
-
- if (used_pol_set && used_pol_clr && pol_set != pol_clr)
- return did_something;
-
- if (cell->type == ID($dlatchsr))
- return did_something;
-
- State unified_pol = used_pol_set ? pol_set : pol_clr;
-
- if (cell->type == ID($dffsr))
- {
- if (hasreset)
- {
- log("Converting %s (%s) to %s in module %s.\n", log_id(cell), log_id(cell->type), "$adff", log_id(mod));
-
- cell->type = ID($adff);
- cell->setParam(ID::ARST_POLARITY, unified_pol);
- cell->setParam(ID::ARST_VALUE, reset_val);
- cell->setPort(ID::ARST, sig_reset);
-
- cell->unsetParam(ID::SET_POLARITY);
- cell->unsetParam(ID::CLR_POLARITY);
- cell->unsetPort(ID::SET);
- cell->unsetPort(ID::CLR);
- }
- else
- {
- log("Converting %s (%s) to %s in module %s.\n", log_id(cell), log_id(cell->type), "$dff", log_id(mod));
-
- cell->type = ID($dff);
- cell->unsetParam(ID::SET_POLARITY);
- cell->unsetParam(ID::CLR_POLARITY);
- cell->unsetPort(ID::SET);
- cell->unsetPort(ID::CLR);
- }
-
- return true;
- }
-
- if (!hasreset)
- {
- IdString new_type;
-
- if (cell->type.begins_with("$_DFFSR_"))
- new_type = stringf("$_DFF_%c_", cell->type[8]);
- else if (cell->type.begins_with("$_DLATCHSR_"))
- new_type = stringf("$_DLATCH_%c_", cell->type[11]);
- else
- log_abort();
-
- log("Converting %s (%s) to %s in module %s.\n", log_id(cell), log_id(cell->type), log_id(new_type), log_id(mod));
-
- cell->type = new_type;
- cell->unsetPort(ID::S);
- cell->unsetPort(ID::R);
-
- return true;
- }
-
- return did_something;
-}
-
-bool handle_dlatch(RTLIL::Module *mod, RTLIL::Cell *dlatch)
-{
- SigSpec sig_e;
- State on_state, off_state;
-
- if (dlatch->type == ID($dlatch)) {
- sig_e = assign_map(dlatch->getPort(ID::EN));
- on_state = dlatch->getParam(ID::EN_POLARITY).as_bool() ? State::S1 : State::S0;
- off_state = dlatch->getParam(ID::EN_POLARITY).as_bool() ? State::S0 : State::S1;
- } else
- if (dlatch->type == ID($_DLATCH_P_)) {
- sig_e = assign_map(dlatch->getPort(ID::E));
- on_state = State::S1;
- off_state = State::S0;
- } else
- if (dlatch->type == ID($_DLATCH_N_)) {
- sig_e = assign_map(dlatch->getPort(ID::E));
- on_state = State::S0;
- off_state = State::S1;
- } else
- log_abort();
-
- if (sig_e == off_state)
- {
- RTLIL::Const val_init;
- for (auto bit : dff_init_map(dlatch->getPort(ID::Q)))
- val_init.bits.push_back(bit.wire == NULL ? bit.data : State::Sx);
- mod->connect(dlatch->getPort(ID::Q), val_init);
- goto delete_dlatch;
- }
-
- if (sig_e == on_state)
- {
- mod->connect(dlatch->getPort(ID::Q), dlatch->getPort(ID::D));
- goto delete_dlatch;
- }
-
- return false;
-
-delete_dlatch:
- log("Removing %s (%s) from module %s.\n", log_id(dlatch), log_id(dlatch->type), log_id(mod));
- remove_init_attr(dlatch->getPort(ID::Q));
- mod->remove(dlatch);
- return true;
-}
-
-bool handle_dff(RTLIL::Module *mod, RTLIL::Cell *dff)
-{
- RTLIL::SigSpec sig_d, sig_q, sig_c, sig_r, sig_e;
- RTLIL::Const val_cp, val_rp, val_rv, val_ep;
-
- if (dff->type == ID($_FF_)) {
- sig_d = dff->getPort(ID::D);
- sig_q = dff->getPort(ID::Q);
- }
- else if (dff->type == ID($_DFF_N_) || dff->type == ID($_DFF_P_)) {
- sig_d = dff->getPort(ID::D);
- sig_q = dff->getPort(ID::Q);
- sig_c = dff->getPort(ID::C);
- val_cp = RTLIL::Const(dff->type == ID($_DFF_P_), 1);
- }
- else if (dff->type.begins_with("$_DFF_") && dff->type.compare(9, 1, "_") == 0 &&
- (dff->type[6] == 'N' || dff->type[6] == 'P') &&
- (dff->type[7] == 'N' || dff->type[7] == 'P') &&
- (dff->type[8] == '0' || dff->type[8] == '1')) {
- sig_d = dff->getPort(ID::D);
- sig_q = dff->getPort(ID::Q);
- sig_c = dff->getPort(ID::C);
- sig_r = dff->getPort(ID::R);
- val_cp = RTLIL::Const(dff->type[6] == 'P', 1);
- val_rp = RTLIL::Const(dff->type[7] == 'P', 1);
- val_rv = RTLIL::Const(dff->type[8] == '1', 1);
- }
- else if (dff->type.begins_with("$_DFFE_") && dff->type.compare(9, 1, "_") == 0 &&
- (dff->type[7] == 'N' || dff->type[7] == 'P') &&
- (dff->type[8] == 'N' || dff->type[8] == 'P')) {
- sig_d = dff->getPort(ID::D);
- sig_q = dff->getPort(ID::Q);
- sig_c = dff->getPort(ID::C);
- sig_e = dff->getPort(ID::E);
- val_cp = RTLIL::Const(dff->type[7] == 'P', 1);
- val_ep = RTLIL::Const(dff->type[8] == 'P', 1);
- }
- else if (dff->type == ID($ff)) {
- sig_d = dff->getPort(ID::D);
- sig_q = dff->getPort(ID::Q);
- }
- else if (dff->type == ID($dff)) {
- sig_d = dff->getPort(ID::D);
- sig_q = dff->getPort(ID::Q);
- sig_c = dff->getPort(ID::CLK);
- val_cp = RTLIL::Const(dff->parameters[ID::CLK_POLARITY].as_bool(), 1);
- }
- else if (dff->type == ID($dffe)) {
- sig_e = dff->getPort(ID::EN);
- sig_d = dff->getPort(ID::D);
- sig_q = dff->getPort(ID::Q);
- sig_c = dff->getPort(ID::CLK);
- val_cp = RTLIL::Const(dff->parameters[ID::CLK_POLARITY].as_bool(), 1);
- val_ep = RTLIL::Const(dff->parameters[ID::EN_POLARITY].as_bool(), 1);
- }
- else if (dff->type == ID($adff)) {
- sig_d = dff->getPort(ID::D);
- sig_q = dff->getPort(ID::Q);
- sig_c = dff->getPort(ID::CLK);
- sig_r = dff->getPort(ID::ARST);
- val_cp = RTLIL::Const(dff->parameters[ID::CLK_POLARITY].as_bool(), 1);
- val_rp = RTLIL::Const(dff->parameters[ID::ARST_POLARITY].as_bool(), 1);
- val_rv = dff->parameters[ID::ARST_VALUE];
- }
- else
- log_abort();
-
- assign_map.apply(sig_d);
- assign_map.apply(sig_q);
- assign_map.apply(sig_c);
- assign_map.apply(sig_r);
-
- bool has_init = false;
- RTLIL::Const val_init;
- for (auto bit : dff_init_map(sig_q).to_sigbit_vector()) {
- if (bit.wire == NULL || keepdc)
- has_init = true;
- val_init.bits.push_back(bit.wire == NULL ? bit.data : RTLIL::State::Sx);
- }
-
- if (dff->type.in(ID($ff), ID($dff)) && mux_drivers.has(sig_d)) {
- std::set<RTLIL::Cell*> muxes;
- mux_drivers.find(sig_d, muxes);
- for (auto mux : muxes) {
- RTLIL::SigSpec sig_a = assign_map(mux->getPort(ID::A));
- RTLIL::SigSpec sig_b = assign_map(mux->getPort(ID::B));
- if (sig_a == sig_q && sig_b.is_fully_const() && (!has_init || val_init == sig_b.as_const())) {
- mod->connect(sig_q, sig_b);
- goto delete_dff;
- }
- if (sig_b == sig_q && sig_a.is_fully_const() && (!has_init || val_init == sig_a.as_const())) {
- mod->connect(sig_q, sig_a);
- goto delete_dff;
- }
- }
- }
-
- // If clock is driven by a constant and (i) no reset signal
- // (ii) Q has no initial value
- // (iii) initial value is same as reset value
- if (!sig_c.empty() && sig_c.is_fully_const() && (!sig_r.size() || !has_init || val_init == val_rv)) {
- if (val_rv.bits.size() == 0)
- val_rv = val_init;
- // Q is permanently reset value or initial value
- mod->connect(sig_q, val_rv);
- goto delete_dff;
- }
-
- // If D is fully undefined and reset signal present and (i) Q has no initial value
- // (ii) initial value is same as reset value
- if (sig_d.is_fully_undef() && sig_r.size() && (!has_init || val_init == val_rv)) {
- // Q is permanently reset value
- mod->connect(sig_q, val_rv);
- goto delete_dff;
- }
-
- // If D is fully undefined and no reset signal and Q has an initial value
- if (sig_d.is_fully_undef() && !sig_r.size() && has_init) {
- // Q is permanently initial value
- mod->connect(sig_q, val_init);
- goto delete_dff;
- }
-
- // If D is fully constant and (i) no reset signal
- // (ii) reset value is same as constant D
- // and (a) has no initial value
- // (b) initial value same as constant D
- if (sig_d.is_fully_const() && (!sig_r.size() || val_rv == sig_d.as_const()) && (!has_init || val_init == sig_d.as_const())) {
- // Q is permanently D
- mod->connect(sig_q, sig_d);
- goto delete_dff;
- }
-
- // If D input is same as Q output and (i) no reset signal
- // (ii) no initial signal
- // (iii) initial value is same as reset value
- if (sig_d == sig_q && (sig_r.empty() || !has_init || val_init == val_rv)) {
- // Q is permanently reset value or initial value
- if (sig_r.size())
- mod->connect(sig_q, val_rv);
- else if (has_init)
- mod->connect(sig_q, val_init);
- goto delete_dff;
- }
-
- // If reset signal is present, and is fully constant
- if (!sig_r.empty() && sig_r.is_fully_const())
- {
- // If reset value is permanently active or if reset is undefined
- if (sig_r == val_rp || sig_r.is_fully_undef()) {
- // Q is permanently reset value
- mod->connect(sig_q, val_rv);
- goto delete_dff;
- }
-
- log("Removing unused reset from %s (%s) from module %s.\n", log_id(dff), log_id(dff->type), log_id(mod));
-
- if (dff->type == ID($adff)) {
- dff->type = ID($dff);
- dff->unsetPort(ID::ARST);
- dff->unsetParam(ID::ARST_POLARITY);
- dff->unsetParam(ID::ARST_VALUE);
- return true;
- }
-
- log_assert(dff->type.begins_with("$_DFF_"));
- dff->type = stringf("$_DFF_%c_", + dff->type[6]);
- dff->unsetPort(ID::R);
- }
-
- // If enable signal is present, and is fully constant
- if (!sig_e.empty() && sig_e.is_fully_const())
- {
- // If enable value is permanently inactive
- if (sig_e != val_ep) {
- // Q is permanently initial value
- mod->connect(sig_q, val_init);
- goto delete_dff;
- }
-
- log("Removing unused enable from %s (%s) from module %s.\n", log_id(dff), log_id(dff->type), log_id(mod));
-
- if (dff->type == ID($dffe)) {
- dff->type = ID($dff);
- dff->unsetPort(ID::EN);
- dff->unsetParam(ID::EN_POLARITY);
- return true;
- }
-
- log_assert(dff->type.begins_with("$_DFFE_"));
- dff->type = stringf("$_DFF_%c_", + dff->type[7]);
- dff->unsetPort(ID::E);
- }
-
- if (sat && has_init && (!sig_r.size() || val_init == val_rv))
- {
- bool removed_sigbits = false;
-
- ezSatPtr ez;
- SatGen satgen(ez.get(), &assign_map);
- pool<Cell*> sat_cells;
-
- std::function<void(Cell*)> sat_import_cell = [&](Cell *c) {
- if (!sat_cells.insert(c).second)
- return;
- if (!satgen.importCell(c))
- return;
- for (auto &conn : c->connections()) {
- if (!c->input(conn.first))
- continue;
- for (auto bit : assign_map(conn.second))
- if (bit2driver.count(bit))
- sat_import_cell(bit2driver.at(bit));
- }
- };
-
- // For each register bit, try to prove that it cannot change from the initial value. If so, remove it
- for (int position = 0; position < GetSize(sig_d); position += 1) {
- RTLIL::SigBit q_sigbit = sig_q[position];
- RTLIL::SigBit d_sigbit = sig_d[position];
-
- if ((!q_sigbit.wire) || (!d_sigbit.wire))
- continue;
-
- if (!bit2driver.count(d_sigbit))
- continue;
-
- sat_import_cell(bit2driver.at(d_sigbit));
-
- RTLIL::State sigbit_init_val = val_init[position];
- if (sigbit_init_val != State::S0 && sigbit_init_val != State::S1)
- continue;
-
- int init_sat_pi = satgen.importSigSpec(sigbit_init_val).front();
- int q_sat_pi = satgen.importSigBit(q_sigbit);
- int d_sat_pi = satgen.importSigBit(d_sigbit);
-
- // Try to find out whether the register bit can change under some circumstances
- bool counter_example_found = ez->solve(ez->IFF(q_sat_pi, init_sat_pi), ez->NOT(ez->IFF(d_sat_pi, init_sat_pi)));
-
- // If the register bit cannot change, we can replace it with a constant
- if (!counter_example_found)
- {
- log("Setting constant %d-bit at position %d on %s (%s) from module %s.\n", sigbit_init_val ? 1 : 0,
- position, log_id(dff), log_id(dff->type), log_id(mod));
-
- SigSpec tmp = dff->getPort(ID::D);
- tmp[position] = sigbit_init_val;
- dff->setPort(ID::D, tmp);
-
- removed_sigbits = true;
- }
- }
-
- if (removed_sigbits) {
- handle_dff(mod, dff);
- return true;
- }
- }
-
-
- return false;
-
-delete_dff:
- log("Removing %s (%s) from module %s.\n", log_id(dff), log_id(dff->type), log_id(mod));
- remove_init_attr(dff->getPort(ID::Q));
- mod->remove(dff);
-
- for (auto &entry : bit2driver)
- if (entry.second == dff)
- bit2driver.erase(entry.first);
-
- return true;
-}
-
-struct OptRmdffPass : public Pass {
- OptRmdffPass() : Pass("opt_rmdff", "remove DFFs with constant inputs") { }
- void help() override
- {
- // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
- log("\n");
- log(" opt_rmdff [-keepdc] [-sat] [selection]\n");
- log("\n");
- log("This pass identifies flip-flops with constant inputs and replaces them with\n");
- log("a constant driver.\n");
- log("\n");
- log(" -sat\n");
- log(" additionally invoke SAT solver to detect and remove flip-flops (with \n");
- log(" non-constant inputs) that can also be replaced with a constant driver\n");
- log("\n");
- }
- void execute(std::vector<std::string> args, RTLIL::Design *design) override
- {
- int total_count = 0, total_initdrv = 0;
- log_header(design, "Executing OPT_RMDFF pass (remove dff with constant values).\n");
-
- keepdc = false;
- sat = false;
-
- size_t argidx;
- for (argidx = 1; argidx < args.size(); argidx++) {
- if (args[argidx] == "-keepdc") {
- keepdc = true;
- continue;
- }
- if (args[argidx] == "-sat") {
- sat = true;
- continue;
- }
- break;
- }
- extra_args(args, argidx, design);
-
- for (auto module : design->selected_modules()) {
- pool<SigBit> driven_bits;
- dict<SigBit, State> init_bits;
-
- assign_map.set(module);
- dff_init_map.set(module);
- mux_drivers.clear();
- bit2driver.clear();
- init_attributes.clear();
-
- for (auto wire : module->wires())
- {
- if (wire->attributes.count(ID::init) != 0) {
- Const initval = wire->attributes.at(ID::init);
- for (int i = 0; i < GetSize(initval) && i < GetSize(wire); i++)
- if (initval[i] == State::S0 || initval[i] == State::S1)
- dff_init_map.add(SigBit(wire, i), initval[i]);
- for (int i = 0; i < GetSize(wire); i++) {
- SigBit wire_bit(wire, i), mapped_bit = assign_map(wire_bit);
- if (mapped_bit.wire) {
- init_attributes[mapped_bit].insert(wire_bit);
- if (i < GetSize(initval))
- init_bits[mapped_bit] = initval[i];
- }
- }
- }
-
- if (wire->port_input) {
- for (auto bit : assign_map(wire))
- driven_bits.insert(bit);
- }
- }
-
- std::vector<RTLIL::IdString> dff_list;
- std::vector<RTLIL::IdString> dffsr_list;
- std::vector<RTLIL::IdString> dlatch_list;
- for (auto cell : module->cells())
- {
- for (auto &conn : cell->connections()) {
- bool is_output = cell->output(conn.first);
- if (is_output || !cell->known())
- for (auto bit : assign_map(conn.second)) {
- if (is_output)
- bit2driver[bit] = cell;
- driven_bits.insert(bit);
- }
- }
-
- if (cell->type.in(ID($mux), ID($pmux))) {
- if (cell->getPort(ID::A).size() == cell->getPort(ID::B).size())
- mux_drivers.insert(assign_map(cell->getPort(ID::Y)), cell);
- continue;
- }
-
- if (!design->selected(module, cell))
- continue;
-
- if (cell->type.in(ID($_DFFSR_NNN_), ID($_DFFSR_NNP_), ID($_DFFSR_NPN_), ID($_DFFSR_NPP_),
- ID($_DFFSR_PNN_), ID($_DFFSR_PNP_), ID($_DFFSR_PPN_), ID($_DFFSR_PPP_), ID($dffsr),
- ID($_DLATCHSR_NNN_), ID($_DLATCHSR_NNP_), ID($_DLATCHSR_NPN_), ID($_DLATCHSR_NPP_),
- ID($_DLATCHSR_PNN_), ID($_DLATCHSR_PNP_), ID($_DLATCHSR_PPN_), ID($_DLATCHSR_PPP_), ID($dlatchsr)))
- dffsr_list.push_back(cell->name);
-
- if (cell->type.in(ID($_FF_), ID($_DFF_N_), ID($_DFF_P_),
- ID($_DFF_NN0_), ID($_DFF_NN1_), ID($_DFF_NP0_), ID($_DFF_NP1_),
- ID($_DFF_PN0_), ID($_DFF_PN1_), ID($_DFF_PP0_), ID($_DFF_PP1_),
- ID($_DFFE_NN_), ID($_DFFE_NP_), ID($_DFFE_PN_), ID($_DFFE_PP_),
- ID($ff), ID($dff), ID($dffe), ID($adff)))
- dff_list.push_back(cell->name);
-
- if (cell->type.in(ID($dlatch), ID($_DLATCH_P_), ID($_DLATCH_N_)))
- dlatch_list.push_back(cell->name);
- }
-
- for (auto &id : dffsr_list) {
- if (module->cell(id) != nullptr &&
- handle_dffsr(module, module->cells_[id]))
- total_count++;
- }
-
- for (auto &id : dff_list) {
- if (module->cell(id) != nullptr &&
- handle_dff(module, module->cells_[id]))
- total_count++;
- }
-
- for (auto &id : dlatch_list) {
- if (module->cell(id) != nullptr &&
- handle_dlatch(module, module->cells_[id]))
- total_count++;
- }
-
- SigSpec const_init_sigs;
-
- for (auto bit : init_bits)
- if (!driven_bits.count(bit.first))
- const_init_sigs.append(bit.first);
-
- const_init_sigs.sort_and_unify();
-
- for (SigSpec sig : const_init_sigs.chunks())
- {
- Const val;
-
- for (auto bit : sig)
- val.bits.push_back(init_bits.at(bit));
-
- log("Promoting init spec %s = %s to constant driver in module %s.\n",
- log_signal(sig), log_signal(val), log_id(module));
-
- module->connect(sig, val);
- remove_init_attr(sig);
- total_initdrv++;
- }
- }
-
- assign_map.clear();
- mux_drivers.clear();
- bit2driver.clear();
- init_attributes.clear();
-
- if (total_count || total_initdrv)
- design->scratchpad_set_bool("opt.did_something", true);
-
- if (total_initdrv)
- log("Promoted %d init specs to constant drivers.\n", total_initdrv);
-
- if (total_count)
- log("Replaced %d DFF cells.\n", total_count);
- }
-} OptRmdffPass;
-
-PRIVATE_NAMESPACE_END
From a0e99a9f3f0a52e3a6f2000791d93b54ce116928 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcelina=20Ko=C5=9Bcielnicka?= <mwk@0x04.net>
Date: Wed, 15 Jul 2020 02:37:43 +0200
Subject: [PATCH 2/4] peepopt: Remove now-redundant dffmux pattern.
---
passes/pmgen/Makefile.inc | 1 -
passes/pmgen/peepopt.cc | 3 -
passes/pmgen/peepopt_dffmux.pmg | 171 --------------------------------
tests/opt/opt_dff_dffmux.ys | 129 ++++++++++++++++++++++++
tests/various/peepopt.ys | 143 --------------------------
5 files changed, 129 insertions(+), 318 deletions(-)
delete mode 100644 passes/pmgen/peepopt_dffmux.pmg
create mode 100644 tests/opt/opt_dff_dffmux.ys
diff --git a/passes/pmgen/Makefile.inc b/passes/pmgen/Makefile.inc
index 1a57bef7d..c6bbc386a 100644
--- a/passes/pmgen/Makefile.inc
+++ b/passes/pmgen/Makefile.inc
@@ -36,7 +36,6 @@ $(eval $(call add_extra_objs,passes/pmgen/peepopt_pm.h))
PEEPOPT_PATTERN = passes/pmgen/peepopt_shiftmul.pmg
PEEPOPT_PATTERN += passes/pmgen/peepopt_muldiv.pmg
-PEEPOPT_PATTERN += passes/pmgen/peepopt_dffmux.pmg
passes/pmgen/peepopt_pm.h: passes/pmgen/pmgen.py $(PEEPOPT_PATTERN)
$(P) mkdir -p passes/pmgen && $(PYTHON_EXECUTABLE) $< -o $@ -p peepopt $(filter-out $<,$^)
diff --git a/passes/pmgen/peepopt.cc b/passes/pmgen/peepopt.cc
index c16b4486d..a9c62fcf6 100644
--- a/passes/pmgen/peepopt.cc
+++ b/passes/pmgen/peepopt.cc
@@ -67,8 +67,6 @@ struct PeepoptPass : public Pass {
GENERATE_PATTERN(peepopt_pm, shiftmul);
else if (genmode == "muldiv")
GENERATE_PATTERN(peepopt_pm, muldiv);
- else if (genmode == "dffmux")
- GENERATE_PATTERN(peepopt_pm, dffmux);
else
log_abort();
return;
@@ -106,7 +104,6 @@ struct PeepoptPass : public Pass {
pm.run_shiftmul();
pm.run_muldiv();
- pm.run_dffmux();
for (auto w : module->wires()) {
auto it = w->attributes.find(ID::init);
diff --git a/passes/pmgen/peepopt_dffmux.pmg b/passes/pmgen/peepopt_dffmux.pmg
deleted file mode 100644
index 0069b0570..000000000
--- a/passes/pmgen/peepopt_dffmux.pmg
+++ /dev/null
@@ -1,171 +0,0 @@
-pattern dffmux
-
-state <IdString> cemuxAB rstmuxBA
-state <SigSpec> sigD
-
-match dff
- select dff->type == $dff
- select GetSize(port(dff, \D)) > 1
-endmatch
-
-code sigD
- sigD = port(dff, \D);
-endcode
-
-match rstmux
- select rstmux->type == $mux
- select GetSize(port(rstmux, \Y)) > 1
- index <SigSpec> port(rstmux, \Y) === sigD
- choice <IdString> BA {\B, \A}
- select port(rstmux, BA).is_fully_const()
- set rstmuxBA BA
- semioptional
-endmatch
-
-code sigD
- if (rstmux)
- sigD = port(rstmux, rstmuxBA == \B ? \A : \B);
-endcode
-
-match cemux
- select cemux->type == $mux
- select GetSize(port(cemux, \Y)) > 1
- index <SigSpec> port(cemux, \Y) === sigD
- choice <IdString> AB {\A, \B}
- index <SigSpec> port(cemux, AB) === port(dff, \Q)
- set cemuxAB AB
- semioptional
-endmatch
-
-code
- if (!cemux && !rstmux)
- reject;
-endcode
-
-code
- Const rst;
- SigSpec D;
- if (cemux) {
- D = port(cemux, cemuxAB == \A ? \B : \A);
- if (rstmux)
- rst = port(rstmux, rstmuxBA).as_const();
- else
- rst = Const(State::Sx, GetSize(D));
- }
- else {
- log_assert(rstmux);
- D = port(rstmux, rstmuxBA == \B ? \A : \B);
- rst = port(rstmux, rstmuxBA).as_const();
- }
- SigSpec Q = port(dff, \Q);
- int width = GetSize(D);
-
- SigSpec dffD = dff->getPort(\D);
- SigSpec dffQ = dff->getPort(\Q);
-
- Const initval;
- for (auto b : Q) {
- auto it = initbits.find(b);
- initval.bits.push_back(it == initbits.end() ? State::Sx : it->second);
- }
-
- auto cmpx = [=](State lhs, State rhs) {
- if (lhs == State::Sx || rhs == State::Sx)
- return true;
- return lhs == rhs;
- };
-
- int i = width-1;
- while (i > 1) {
- if (D[i] != D[i-1])
- break;
- if (!cmpx(rst[i], rst[i-1]))
- break;
- if (!cmpx(initval[i], initval[i-1]))
- break;
- if (!cmpx(rst[i], initval[i]))
- break;
- rminitbits.insert(Q[i]);
- module->connect(Q[i], Q[i-1]);
- i--;
- }
- if (i < width-1) {
- did_something = true;
- if (cemux) {
- SigSpec ceA = cemux->getPort(\A);
- SigSpec ceB = cemux->getPort(\B);
- SigSpec ceY = cemux->getPort(\Y);
- ceA.remove(i, width-1-i);
- ceB.remove(i, width-1-i);
- ceY.remove(i, width-1-i);
- cemux->setPort(\A, ceA);
- cemux->setPort(\B, ceB);
- cemux->setPort(\Y, ceY);
- cemux->fixup_parameters();
- blacklist(cemux);
- }
- if (rstmux) {
- SigSpec rstA = rstmux->getPort(\A);
- SigSpec rstB = rstmux->getPort(\B);
- SigSpec rstY = rstmux->getPort(\Y);
- rstA.remove(i, width-1-i);
- rstB.remove(i, width-1-i);
- rstY.remove(i, width-1-i);
- rstmux->setPort(\A, rstA);
- rstmux->setPort(\B, rstB);
- rstmux->setPort(\Y, rstY);
- rstmux->fixup_parameters();
- blacklist(rstmux);
- }
- dffD.remove(i, width-1-i);
- dffQ.remove(i, width-1-i);
- dff->setPort(\D, dffD);
- dff->setPort(\Q, dffQ);
- dff->fixup_parameters();
- blacklist(dff);
-
- log("dffcemux pattern in %s: dff=%s, cemux=%s, rstmux=%s; removed top %d bits.\n", log_id(module), log_id(dff), log_id(cemux, "n/a"), log_id(rstmux, "n/a"), width-1-i);
- width = i+1;
- }
- if (cemux) {
- SigSpec ceA = cemux->getPort(\A);
- SigSpec ceB = cemux->getPort(\B);
- SigSpec ceY = cemux->getPort(\Y);
-
- int count = 0;
- for (int i = width-1; i >= 0; i--) {
- if (D[i].wire)
- continue;
- if (cmpx(rst[i], D[i].data) && cmpx(initval[i], D[i].data)) {
- count++;
- rminitbits.insert(Q[i]);
- module->connect(Q[i], D[i]);
- ceA.remove(i);
- ceB.remove(i);
- ceY.remove(i);
- dffD.remove(i);
- dffQ.remove(i);
- }
- }
- if (count > 0)
- {
- did_something = true;
-
- cemux->setPort(\A, ceA);
- cemux->setPort(\B, ceB);
- cemux->setPort(\Y, ceY);
- cemux->fixup_parameters();
- blacklist(cemux);
-
- dff->setPort(\D, dffD);
- dff->setPort(\Q, dffQ);
- dff->fixup_parameters();
- blacklist(dff);
-
- log("dffcemux pattern in %s: dff=%s, cemux=%s, rstmux=%s; removed %d constant bits.\n", log_id(module), log_id(dff), log_id(cemux), log_id(rstmux, "n/a"), count);
- }
- }
-
- if (did_something)
- accept;
-endcode
diff --git a/tests/opt/opt_dff_dffmux.ys b/tests/opt/opt_dff_dffmux.ys
new file mode 100644
index 000000000..43190cc31
--- /dev/null
+++ b/tests/opt/opt_dff_dffmux.ys
@@ -0,0 +1,129 @@
+design -reset
+read_verilog <<EOT
+module opt_dffmuxext_unsigned(input clk, ce, input [1:0] i, output reg [3:0] o);
+ always @(posedge clk) if (ce) o <= i;
+endmodule
+EOT
+
+proc
+equiv_opt -assert opt
+design -load postopt
+select -assert-count 1 t:$dffe r:WIDTH=2 %i
+select -assert-count 0 t:$dffe %% t:* %D
+
+####################
+
+design -reset
+read_verilog <<EOT
+module opt_dffmuxext_signed(input clk, ce, input signed [1:0] i, output reg signed [3:0] o);
+ always @(posedge clk) if (ce) o <= i;
+endmodule
+EOT
+
+proc
+equiv_opt -assert opt
+design -load postopt
+wreduce
+select -assert-count 1 t:$dffe r:WIDTH=2 %i
+select -assert-count 0 t:$dffe %% t:* %D
+
+###################
+
+design -reset
+read_verilog <<EOT
+module opt_dffmuxext_const(input clk, ce, input [1:0] i, output reg [5:0] o);
+ always @(posedge clk) if (ce) o <= {1'b0, i[1], 2'b1x, i[0], 1'bz};
+endmodule
+EOT
+
+proc
+equiv_opt -assert opt
+design -load postopt
+select -assert-count 1 t:$dffe r:WIDTH=2 %i
+select -assert-count 0 t:$dffe %% t:* %D
+
+###################
+
+design -reset
+read_verilog <<EOT
+module opt_dffmuxext_const_init(input clk, ce, input [1:0] i, (* init=6'b0x00x1 *) output reg [5:0] o);
+ always @(posedge clk) if (ce) o <= {1'b0, i[1], 2'b1x, i[0], 1'bz};
+endmodule
+EOT
+
+proc
+equiv_opt -assert opt
+design -load postopt
+select -assert-count 1 t:$dffe r:WIDTH=4 %i
+select -assert-count 0 t:$dffe %% t:* %D
+
+####################
+
+design -reset
+read_verilog <<EOT
+module opt_dffmuxext_unsigned_rst(input clk, ce, rst, input [1:0] i, output reg [3:0] o);
+ always @(posedge clk) if (rst) o <= 0; else if (ce) o <= i;
+endmodule
+EOT
+
+proc
+equiv_opt -assert opt
+design -load postopt
+wreduce
+select -assert-count 1 t:$sdffe r:WIDTH=2 %i
+select -assert-count 0 t:$sdffe %% t:* %D
+
+####################
+
+design -reset
+read_verilog <<EOT
+module opt_dffmuxext_signed_rst(input clk, ce, rstn, input signed [1:0] i, output reg signed [3:0] o);
+ always @(posedge clk) begin
+ if (ce) o <= i;
+ if (!rstn) o <= 4'b1111;
+ end
+endmodule
+EOT
+
+proc
+equiv_opt -assert opt
+design -load postopt
+wreduce
+select -assert-count 1 t:$sdffe r:WIDTH=2 %i
+select -assert-count 0 t:$sdffe %% t:* %D
+
+####################
+
+design -reset
+read_verilog <<EOT
+module opt_dffmuxext_signed_rst_init(input clk, ce, rstn, input signed [1:0] i, output reg signed [3:0] o);
+ initial o <= 4'b0010;
+ always @(posedge clk) begin
+ if (ce) o <= i;
+ if (!rstn) o <= 4'b1111;
+ end
+endmodule
+EOT
+
+proc
+# NB: equiv_opt uses equiv_induct which covers
+# only the induction half of temporal induction
+# --- missing the base-case half
+# This makes it akin to `sat -tempinduct-inductonly`
+# instead of `sat -tempinduct-baseonly` or
+# `sat -tempinduct` which is necessary for this
+# testcase
+#equiv_opt -assert opt
+
+design -save gold
+opt
+wreduce
+design -stash gate
+design -import gold -as gold
+design -import gate -as gate
+miter -equiv -flatten -make_assert -make_outputs gold gate miter
+sat -tempinduct -verify -prove-asserts -show-ports miter
+
+design -load gate
+select -assert-count 1 t:$sdffe r:WIDTH=3 %i
+select -assert-count 0 t:$sdffe %% t:* %D
diff --git a/tests/various/peepopt.ys b/tests/various/peepopt.ys
index ee5ad8a1a..45e936a21 100644
--- a/tests/various/peepopt.ys
+++ b/tests/various/peepopt.ys
@@ -68,146 +68,3 @@ equiv_opt -assert peepopt
design -load postopt
clean
select -assert-count 0 t:*
-
-####################
-
-design -reset
-read_verilog <<EOT
-module peepopt_dffmuxext_unsigned(input clk, ce, input [1:0] i, output reg [3:0] o);
- always @(posedge clk) if (ce) o <= i;
-endmodule
-EOT
-
-proc
-equiv_opt -assert peepopt
-design -load postopt
-clean
-select -assert-count 1 t:$dff r:WIDTH=2 %i
-select -assert-count 1 t:$mux r:WIDTH=2 %i
-select -assert-count 0 t:$dff t:$mux %% t:* %D
-
-####################
-
-design -reset
-read_verilog <<EOT
-module peepopt_dffmuxext_signed(input clk, ce, input signed [1:0] i, output reg signed [3:0] o);
- always @(posedge clk) if (ce) o <= i;
-endmodule
-EOT
-
-proc
-equiv_opt -assert peepopt
-design -load postopt
-clean
-select -assert-count 1 t:$dff r:WIDTH=2 %i
-select -assert-count 1 t:$mux r:WIDTH=2 %i
-select -assert-count 0 t:$dff t:$mux %% t:* %D
-
-###################
-
-design -reset
-read_verilog <<EOT
-module peepopt_dffmuxext_const(input clk, ce, input [1:0] i, output reg [5:0] o);
- always @(posedge clk) if (ce) o <= {1'b0, i[1], 2'b1x, i[0], 1'bz};
-endmodule
-EOT
-
-proc
-equiv_opt -assert peepopt
-design -load postopt
-select -assert-count 1 t:$dff r:WIDTH=2 %i
-select -assert-count 1 t:$mux r:WIDTH=2 %i
-select -assert-count 0 t:$dff t:$mux %% t:* %D
-
-###################
-
-design -reset
-read_verilog <<EOT
-module peepopt_dffmuxext_const_init(input clk, ce, input [1:0] i, (* init=6'b0x00x1 *) output reg [5:0] o);
- always @(posedge clk) if (ce) o <= {1'b0, i[1], 2'b1x, i[0], 1'bz};
-endmodule
-EOT
-
-proc
-equiv_opt -assert peepopt
-design -load postopt
-select -assert-count 1 t:$dff r:WIDTH=4 %i
-select -assert-count 1 t:$mux r:WIDTH=4 %i
-select -assert-count 0 t:$dff t:$mux %% t:* %D
-
-####################
-
-design -reset
-read_verilog <<EOT
-module peepopt_dffmuxext_unsigned_rst(input clk, ce, rst, input [1:0] i, output reg [3:0] o);
- always @(posedge clk) if (rst) o <= 0; else if (ce) o <= i;
-endmodule
-EOT
-
-proc
-equiv_opt -assert peepopt
-design -load postopt
-wreduce
-select -assert-count 1 t:$dff r:WIDTH=2 %i
-select -assert-count 2 t:$mux
-select -assert-count 2 t:$mux r:WIDTH=2 %i
-select -assert-count 0 t:$dff t:$mux %% t:* %D
-
-####################
-
-design -reset
-read_verilog <<EOT
-module peepopt_dffmuxext_signed_rst(input clk, ce, rstn, input signed [1:0] i, output reg signed [3:0] o);
- always @(posedge clk) begin
- if (ce) o <= i;
- if (!rstn) o <= 4'b1111;
- end
-endmodule
-EOT
-
-proc
-equiv_opt -assert peepopt
-design -load postopt
-wreduce
-select -assert-count 1 t:$dff r:WIDTH=2 %i
-select -assert-count 2 t:$mux
-select -assert-count 2 t:$mux r:WIDTH=2 %i
-select -assert-count 0 t:$logic_not t:$dff t:$mux %% t:* %D
-
-####################
-
-design -reset
-read_verilog <<EOT
-module peepopt_dffmuxext_signed_rst_init(input clk, ce, rstn, input signed [1:0] i, output reg signed [3:0] o);
- initial o <= 4'b0010;
- always @(posedge clk) begin
- if (ce) o <= i;
- if (!rstn) o <= 4'b1111;
- end
-endmodule
-EOT
-
-proc
-# NB: equiv_opt uses equiv_induct which covers
-# only the induction half of temporal induction
-# --- missing the base-case half
-# This makes it akin to `sat -tempinduct-inductonly`
-# instead of `sat -tempinduct-baseonly` or
-# `sat -tempinduct` which is necessary for this
-# testcase
-#equiv_opt -assert peepopt
-
-design -save gold
-peepopt
-wreduce
-design -stash gate
-design -import gold -as gold
-design -import gate -as gate
-miter -equiv -flatten -make_assert -make_outputs gold gate miter
-sat -tempinduct -verify -prove-asserts -show-ports miter
-
-design -load gate
-select -assert-count 1 t:$dff r:WIDTH=4 %i
-select -assert-count 2 t:$mux
-select -assert-count 2 t:$mux r:WIDTH=4 %i
-select -assert-count 0 t:$logic_not t:$dff t:$mux %% t:* %D
From 5693386a4ec7fc05c12a6c98900e19d5b2851396 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcelina=20Ko=C5=9Bcielnicka?= <mwk@0x04.net>
Date: Tue, 21 Jul 2020 16:41:26 +0200
Subject: [PATCH 3/4] Remove now-redundant dff2dffs pass.
---
passes/techmap/Makefile.inc | 1 -
passes/techmap/dff2dffs.cc | 165 ------------------------------------
tests/techmap/dff2dffs.ys | 50 -----------
3 files changed, 216 deletions(-)
delete mode 100644 passes/techmap/dff2dffs.cc
delete mode 100644 tests/techmap/dff2dffs.ys
diff --git a/passes/techmap/Makefile.inc b/passes/techmap/Makefile.inc
index 5a4d84f94..fed0226d4 100644
--- a/passes/techmap/Makefile.inc
+++ b/passes/techmap/Makefile.inc
@@ -42,7 +42,6 @@ OBJS += passes/techmap/attrmvcp.o
OBJS += passes/techmap/attrmap.o
OBJS += passes/techmap/zinit.o
OBJS += passes/techmap/dfflegalize.o
-OBJS += passes/techmap/dff2dffs.o
OBJS += passes/techmap/dffunmap.o
OBJS += passes/techmap/flowmap.o
OBJS += passes/techmap/extractinv.o
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
diff --git a/tests/techmap/dff2dffs.ys b/tests/techmap/dff2dffs.ys
deleted file mode 100644
index 105a89400..000000000
--- a/tests/techmap/dff2dffs.ys
+++ /dev/null
@@ -1,50 +0,0 @@
-read_verilog << EOT
-module top(...);
-input clk;
-input d;
-input sr;
-output reg q0, q1, q2, q3, q4, q5;
-
-initial q0 = 1'b0;
-initial q1 = 1'b0;
-initial q2 = 1'b1;
-initial q3 = 1'b1;
-initial q4 = 1'bx;
-initial q5 = 1'bx;
-
-always @(posedge clk) begin
- q0 <= sr ? 1'b0 : d;
- q1 <= sr ? 1'b1 : d;
- q2 <= sr ? 1'b0 : d;
- q3 <= sr ? 1'b1 : d;
- q4 <= sr ? 1'b0 : d;
- q5 <= sr ? 1'b1 : d;
-end
-
-endmodule
-EOT
-
-proc
-simplemap
-design -save ref
-
-dff2dffs
-clean
-
-select -assert-count 1 w:q0 %x t:$_SDFF_PP0_ %i
-select -assert-count 1 w:q1 %x t:$_SDFF_PP1_ %i
-select -assert-count 1 w:q2 %x t:$_SDFF_PP0_ %i
-select -assert-count 1 w:q3 %x t:$_SDFF_PP1_ %i
-select -assert-count 1 w:q4 %x t:$_SDFF_PP0_ %i
-select -assert-count 1 w:q5 %x t:$_SDFF_PP1_ %i
-
-design -load ref
-dff2dffs -match-init
-clean
-
-select -assert-count 1 w:q0 %x t:$_SDFF_PP0_ %i
-select -assert-count 0 w:q1 %x t:$_SDFF_PP1_ %i
-select -assert-count 0 w:q2 %x t:$_SDFF_PP0_ %i
-select -assert-count 1 w:q3 %x t:$_SDFF_PP1_ %i
-select -assert-count 1 w:q4 %x t:$_SDFF_PP0_ %i
-select -assert-count 1 w:q5 %x t:$_SDFF_PP1_ %i
From 54a0c083a111efaf5e8b486cb0a6725f4eb260df Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcelina=20Ko=C5=9Bcielnicka?= <mwk@0x04.net>
Date: Tue, 21 Jul 2020 19:24:09 +0200
Subject: [PATCH 4/4] Remove now-redundant dff2dffe pass.
---
passes/techmap/Makefile.inc | 1 -
passes/techmap/dff2dffe.cc | 414 ------------------------------------
2 files changed, 415 deletions(-)
delete mode 100644 passes/techmap/dff2dffe.cc
diff --git a/passes/techmap/Makefile.inc b/passes/techmap/Makefile.inc
index fed0226d4..035699603 100644
--- a/passes/techmap/Makefile.inc
+++ b/passes/techmap/Makefile.inc
@@ -27,7 +27,6 @@ OBJS += passes/techmap/extract_fa.o
OBJS += passes/techmap/extract_counter.o
OBJS += passes/techmap/extract_reduce.o
OBJS += passes/techmap/alumacc.o
-OBJS += passes/techmap/dff2dffe.o
OBJS += passes/techmap/dffinit.o
OBJS += passes/techmap/pmuxtree.o
OBJS += passes/techmap/muxcover.o
diff --git a/passes/techmap/dff2dffe.cc b/passes/techmap/dff2dffe.cc
deleted file mode 100644
index 62ee3fea6..000000000
--- a/passes/techmap/dff2dffe.cc
+++ /dev/null
@@ -1,414 +0,0 @@
-/*
- * yosys -- Yosys Open SYnthesis Suite
- *
- * Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
- *
- * 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"
-#include "kernel/celltypes.h"
-#include "passes/techmap/simplemap.h"
-
-USING_YOSYS_NAMESPACE
-PRIVATE_NAMESPACE_BEGIN
-
-struct Dff2dffeWorker
-{
- const dict<IdString, IdString> &direct_dict;
-
- RTLIL::Module *module;
- SigMap sigmap;
- CellTypes ct;
-
- typedef std::pair<RTLIL::Cell*, int> cell_int_t;
- std::map<RTLIL::SigBit, cell_int_t> bit2mux;
- std::vector<RTLIL::Cell*> dff_cells;
- std::map<RTLIL::SigBit, int> bitusers;
-
- typedef std::map<RTLIL::SigBit, bool> pattern_t;
- typedef std::set<pattern_t> patterns_t;
-
-
- Dff2dffeWorker(RTLIL::Module *module, const dict<IdString, IdString> &direct_dict) :
- direct_dict(direct_dict), module(module), sigmap(module), ct(module->design)
- {
- for (auto wire : module->wires()) {
- if (wire->port_output)
- for (auto bit : sigmap(wire))
- bitusers[bit]++;
- }
-
- for (auto cell : module->cells()) {
- if (cell->type.in(ID($mux), ID($pmux), ID($_MUX_))) {
- RTLIL::SigSpec sig_y = sigmap(cell->getPort(ID::Y));
- for (int i = 0; i < GetSize(sig_y); i++)
- bit2mux[sig_y[i]] = cell_int_t(cell, i);
- }
- if (direct_dict.empty()) {
- if (cell->type.in(ID($dff), ID($_DFF_N_), ID($_DFF_P_)))
- dff_cells.push_back(cell);
- } else {
- if (direct_dict.count(cell->type))
- dff_cells.push_back(cell);
- }
- for (auto conn : cell->connections()) {
- if (ct.cell_output(cell->type, conn.first))
- continue;
- for (auto bit : sigmap(conn.second))
- bitusers[bit]++;
- }
- }
- }
-
- patterns_t find_muxtree_feedback_patterns(RTLIL::SigBit d, RTLIL::SigBit q, pattern_t path)
- {
- patterns_t ret;
-
- if (d == q) {
- ret.insert(path);
- return ret;
- }
-
- if (bit2mux.count(d) == 0 || bitusers[d] > 1)
- return ret;
-
- cell_int_t mux_cell_int = bit2mux.at(d);
- RTLIL::SigSpec sig_a = sigmap(mux_cell_int.first->getPort(ID::A));
- RTLIL::SigSpec sig_b = sigmap(mux_cell_int.first->getPort(ID::B));
- RTLIL::SigSpec sig_s = sigmap(mux_cell_int.first->getPort(ID::S));
- int width = GetSize(sig_a), index = mux_cell_int.second;
-
- for (int i = 0; i < GetSize(sig_s); i++)
- if (path.count(sig_s[i]) && path.at(sig_s[i]))
- {
- ret = find_muxtree_feedback_patterns(sig_b[i*width + index], q, path);
-
- if (sig_b[i*width + index] == q) {
- RTLIL::SigSpec s = mux_cell_int.first->getPort(ID::B);
- s[i*width + index] = RTLIL::Sx;
- mux_cell_int.first->setPort(ID::B, s);
- }
-
- return ret;
- }
-
- pattern_t path_else = path;
-
- for (int i = 0; i < GetSize(sig_s); i++)
- {
- if (path.count(sig_s[i]))
- continue;
-
- pattern_t path_this = path;
- path_else[sig_s[i]] = false;
- path_this[sig_s[i]] = true;
-
- for (auto &pat : find_muxtree_feedback_patterns(sig_b[i*width + index], q, path_this))
- ret.insert(pat);
-
- if (sig_b[i*width + index] == q) {
- RTLIL::SigSpec s = mux_cell_int.first->getPort(ID::B);
- s[i*width + index] = RTLIL::Sx;
- mux_cell_int.first->setPort(ID::B, s);
- }
- }
-
- for (auto &pat : find_muxtree_feedback_patterns(sig_a[index], q, path_else))
- ret.insert(pat);
-
- if (sig_a[index] == q) {
- RTLIL::SigSpec s = mux_cell_int.first->getPort(ID::A);
- s[index] = RTLIL::Sx;
- mux_cell_int.first->setPort(ID::A, s);
- }
-
- return ret;
- }
-
- void simplify_patterns(patterns_t&)
- {
- // TBD
- }
-
- RTLIL::SigSpec make_patterns_logic(patterns_t patterns, bool make_gates)
- {
- RTLIL::SigSpec or_input;
-
- for (auto pat : patterns)
- {
- RTLIL::SigSpec s1, s2;
- for (auto it : pat) {
- s1.append(it.first);
- s2.append(it.second);
- }
-
- RTLIL::SigSpec y = module->addWire(NEW_ID);
- RTLIL::Cell *c = module->addNe(NEW_ID, s1, s2, y);
-
- if (make_gates) {
- simplemap(module, c);
- module->remove(c);
- }
-
- or_input.append(y);
- }
-
- if (GetSize(or_input) == 0)
- return State::S1;
-
- if (GetSize(or_input) == 1)
- return or_input;
-
- RTLIL::SigSpec y = module->addWire(NEW_ID);
- RTLIL::Cell *c = module->addReduceAnd(NEW_ID, or_input, y);
-
- if (make_gates) {
- simplemap(module, c);
- module->remove(c);
- }
-
- return y;
- }
-
- void handle_dff_cell(RTLIL::Cell *dff_cell)
- {
- RTLIL::SigSpec sig_d = sigmap(dff_cell->getPort(ID::D));
- RTLIL::SigSpec sig_q = sigmap(dff_cell->getPort(ID::Q));
-
- std::map<patterns_t, std::set<int>> grouped_patterns;
- std::set<int> remaining_indices;
-
- for (int i = 0 ; i < GetSize(sig_d); i++) {
- patterns_t patterns = find_muxtree_feedback_patterns(sig_d[i], sig_q[i], pattern_t());
- if (!patterns.empty()) {
- simplify_patterns(patterns);
- grouped_patterns[patterns].insert(i);
- } else
- remaining_indices.insert(i);
- }
-
- for (auto &it : grouped_patterns) {
- RTLIL::SigSpec new_sig_d, new_sig_q;
- for (int i : it.second) {
- new_sig_d.append(sig_d[i]);
- new_sig_q.append(sig_q[i]);
- }
- if (!direct_dict.empty()) {
- log(" converting %s cell %s to %s for %s -> %s.\n", log_id(dff_cell->type), log_id(dff_cell), log_id(direct_dict.at(dff_cell->type)), log_signal(new_sig_d), log_signal(new_sig_q));
- dff_cell->setPort(ID::E, make_patterns_logic(it.first, true));
- dff_cell->type = direct_dict.at(dff_cell->type);
- } else
- if (dff_cell->type == ID($dff)) {
- RTLIL::Cell *new_cell = module->addDffe(NEW_ID, dff_cell->getPort(ID::CLK), make_patterns_logic(it.first, false),
- new_sig_d, new_sig_q, dff_cell->getParam(ID::CLK_POLARITY).as_bool(), true);
- log(" created $dffe cell %s for %s -> %s.\n", log_id(new_cell), log_signal(new_sig_d), log_signal(new_sig_q));
- } else {
- RTLIL::Cell *new_cell = module->addDffeGate(NEW_ID, dff_cell->getPort(ID::C), make_patterns_logic(it.first, true),
- new_sig_d, new_sig_q, dff_cell->type == ID($_DFF_P_), true);
- log(" created %s cell %s for %s -> %s.\n", log_id(new_cell->type), log_id(new_cell), log_signal(new_sig_d), log_signal(new_sig_q));
- }
- }
-
- if (!direct_dict.empty())
- return;
-
- if (remaining_indices.empty()) {
- log(" removing now obsolete cell %s.\n", log_id(dff_cell));
- module->remove(dff_cell);
- } else if (GetSize(remaining_indices) != GetSize(sig_d)) {
- log(" removing %d now obsolete bits from cell %s.\n", GetSize(sig_d) - GetSize(remaining_indices), log_id(dff_cell));
- RTLIL::SigSpec new_sig_d, new_sig_q;
- for (int i : remaining_indices) {
- new_sig_d.append(sig_d[i]);
- new_sig_q.append(sig_q[i]);
- }
- dff_cell->setPort(ID::D, new_sig_d);
- dff_cell->setPort(ID::Q, new_sig_q);
- dff_cell->setParam(ID::WIDTH, GetSize(remaining_indices));
- }
- }
-
- void run()
- {
- log("Transforming FF to FF+Enable cells in module %s:\n", log_id(module));
- for (auto dff_cell : dff_cells) {
- // log("Handling candidate %s:\n", log_id(dff_cell));
- handle_dff_cell(dff_cell);
- }
- }
-};
-
-struct Dff2dffePass : public Pass {
- Dff2dffePass() : Pass("dff2dffe", "transform $dff cells to $dffe cells") { }
- void help() override
- {
- // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
- log("\n");
- log(" dff2dffe [options] [selection]\n");
- log("\n");
- log("This pass transforms $dff cells driven by a tree of multiplexers with one or\n");
- log("more feedback paths to $dffe cells. It also works on gate-level cells such as\n");
- log("$_DFF_P_, $_DFF_N_ and $_MUX_.\n");
- log("\n");
- log(" -unmap\n");
- log(" operate in the opposite direction: replace $dffe cells with combinations\n");
- log(" of $dff and $mux cells. the options below are ignored in unmap mode.\n");
- log("\n");
- log(" -unmap-mince N\n");
- log(" Same as -unmap but only unmap $dffe where the clock enable port\n");
- log(" signal is used by less $dffe than the specified number\n");
- log("\n");
- log(" -direct <internal_gate_type> <external_gate_type>\n");
- log(" map directly to external gate type. <internal_gate_type> can\n");
- log(" be any internal gate-level FF cell (except $_DFFE_??_). the\n");
- log(" <external_gate_type> is the cell type name for a cell with an\n");
- log(" identical interface to the <internal_gate_type>, except it\n");
- log(" also has an high-active enable port 'E'.\n");
- log(" Usually <external_gate_type> is an intermediate cell type\n");
- log(" that is then translated to the final type using 'techmap'.\n");
- log("\n");
- log(" -direct-match <pattern>\n");
- log(" like -direct for all DFF cell types matching the expression.\n");
- log(" this will use $_DFFE_* as <external_gate_type> matching the\n");
- log(" internal gate type $_DFF_*_, and $_SDFFE_* for those matching\n");
- log(" $_SDFF_*_, except for $_DFF_[NP]_, which is converted to \n");
- log(" $_DFFE_[NP]_.\n");
- log("\n");
- }
- void execute(std::vector<std::string> args, RTLIL::Design *design) override
- {
- log_header(design, "Executing DFF2DFFE pass (transform $dff to $dffe where applicable).\n");
-
- bool unmap_mode = false;
- int min_ce_use = -1;
- dict<IdString, IdString> direct_dict;
-
- size_t argidx;
- for (argidx = 1; argidx < args.size(); argidx++) {
- if (args[argidx] == "-unmap") {
- unmap_mode = true;
- continue;
- }
- if (args[argidx] == "-unmap-mince" && argidx + 1 < args.size()) {
- unmap_mode = true;
- min_ce_use = atoi(args[++argidx].c_str());
- continue;
- }
- if (args[argidx] == "-direct" && argidx + 2 < args.size()) {
- string direct_from = RTLIL::escape_id(args[++argidx]);
- string direct_to = RTLIL::escape_id(args[++argidx]);
- direct_dict[direct_from] = direct_to;
- continue;
- }
- if (args[argidx] == "-direct-match" && argidx + 1 < args.size()) {
- bool found_match = false;
- const char *pattern = args[++argidx].c_str();
- if (patmatch(pattern, "$_DFF_P_" )) found_match = true, direct_dict[ID($_DFF_P_) ] = ID($_DFFE_PP_);
- if (patmatch(pattern, "$_DFF_N_" )) found_match = true, direct_dict[ID($_DFF_N_) ] = ID($_DFFE_NP_);
- if (patmatch(pattern, "$_DFF_NN0_")) found_match = true, direct_dict[ID($_DFF_NN0_)] = ID($_DFFE_NN0P_);
- if (patmatch(pattern, "$_DFF_NN1_")) found_match = true, direct_dict[ID($_DFF_NN1_)] = ID($_DFFE_NN1P_);
- if (patmatch(pattern, "$_DFF_NP0_")) found_match = true, direct_dict[ID($_DFF_NP0_)] = ID($_DFFE_NP0P_);
- if (patmatch(pattern, "$_DFF_NP1_")) found_match = true, direct_dict[ID($_DFF_NP1_)] = ID($_DFFE_NP1P_);
- if (patmatch(pattern, "$_DFF_PN0_")) found_match = true, direct_dict[ID($_DFF_PN0_)] = ID($_DFFE_PN0P_);
- if (patmatch(pattern, "$_DFF_PN1_")) found_match = true, direct_dict[ID($_DFF_PN1_)] = ID($_DFFE_PN1P_);
- if (patmatch(pattern, "$_DFF_PP0_")) found_match = true, direct_dict[ID($_DFF_PP0_)] = ID($_DFFE_PP0P_);
- if (patmatch(pattern, "$_DFF_PP1_")) found_match = true, direct_dict[ID($_DFF_PP1_)] = ID($_DFFE_PP1P_);
-
- if (patmatch(pattern, "$_SDFF_NN0_")) found_match = true, direct_dict[ID($_SDFF_NN0_)] = ID($_SDFFE_NN0P_);
- if (patmatch(pattern, "$_SDFF_NN1_")) found_match = true, direct_dict[ID($_SDFF_NN1_)] = ID($_SDFFE_NN1P_);
- if (patmatch(pattern, "$_SDFF_NP0_")) found_match = true, direct_dict[ID($_SDFF_NP0_)] = ID($_SDFFE_NP0P_);
- if (patmatch(pattern, "$_SDFF_NP1_")) found_match = true, direct_dict[ID($_SDFF_NP1_)] = ID($_SDFFE_NP1P_);
- if (patmatch(pattern, "$_SDFF_PN0_")) found_match = true, direct_dict[ID($_SDFF_PN0_)] = ID($_SDFFE_PN0P_);
- if (patmatch(pattern, "$_SDFF_PN1_")) found_match = true, direct_dict[ID($_SDFF_PN1_)] = ID($_SDFFE_PN1P_);
- if (patmatch(pattern, "$_SDFF_PP0_")) found_match = true, direct_dict[ID($_SDFF_PP0_)] = ID($_SDFFE_PP0P_);
- if (patmatch(pattern, "$_SDFF_PP1_")) found_match = true, direct_dict[ID($_SDFF_PP1_)] = ID($_SDFFE_PP1P_);
- if (!found_match)
- log_cmd_error("No cell types matched pattern '%s'.\n", pattern);
- continue;
- }
- break;
- }
- extra_args(args, argidx, design);
-
- if (!direct_dict.empty()) {
- log("Selected cell types for direct conversion:\n");
- for (auto &it : direct_dict)
- log(" %s -> %s\n", log_id(it.first), log_id(it.second));
- }
-
- for (auto mod : design->selected_modules())
- if (!mod->has_processes_warn())
- {
- if (unmap_mode) {
- SigMap sigmap(mod);
- for (auto cell : mod->selected_cells()) {
- if (cell->type == ID($dffe)) {
- if (min_ce_use >= 0) {
- int ce_use = 0;
- for (auto cell_other : mod->selected_cells()) {
- if (cell_other->type != cell->type)
- continue;
- if (sigmap(cell->getPort(ID::EN)) == sigmap(cell_other->getPort(ID::EN)))
- ce_use++;
- }
- if (ce_use >= min_ce_use)
- continue;
- }
-
- RTLIL::SigSpec tmp = mod->addWire(NEW_ID, GetSize(cell->getPort(ID::D)));
- mod->addDff(NEW_ID, cell->getPort(ID::CLK), tmp, cell->getPort(ID::Q), cell->getParam(ID::CLK_POLARITY).as_bool());
- if (cell->getParam(ID::EN_POLARITY).as_bool())
- mod->addMux(NEW_ID, cell->getPort(ID::Q), cell->getPort(ID::D), cell->getPort(ID::EN), tmp);
- else
- mod->addMux(NEW_ID, cell->getPort(ID::D), cell->getPort(ID::Q), cell->getPort(ID::EN), tmp);
- mod->remove(cell);
- continue;
- }
- if (cell->type.begins_with("$_DFFE_")) {
- if (min_ce_use >= 0) {
- int ce_use = 0;
- for (auto cell_other : mod->selected_cells()) {
- if (cell_other->type != cell->type)
- continue;
- if (sigmap(cell->getPort(ID::E)) == sigmap(cell_other->getPort(ID::E)))
- ce_use++;
- }
- if (ce_use >= min_ce_use)
- continue;
- }
-
- bool clk_pol = cell->type.compare(7, 1, "P") == 0;
- bool en_pol = cell->type.compare(8, 1, "P") == 0;
- RTLIL::SigSpec tmp = mod->addWire(NEW_ID);
- mod->addDff(NEW_ID, cell->getPort(ID::C), tmp, cell->getPort(ID::Q), clk_pol);
- if (en_pol)
- mod->addMux(NEW_ID, cell->getPort(ID::Q), cell->getPort(ID::D), cell->getPort(ID::E), tmp);
- else
- mod->addMux(NEW_ID, cell->getPort(ID::D), cell->getPort(ID::Q), cell->getPort(ID::E), tmp);
- mod->remove(cell);
- continue;
- }
- }
- continue;
- }
-
- Dff2dffeWorker worker(mod, direct_dict);
- worker.run();
- }
- }
-} Dff2dffePass;
-
-PRIVATE_NAMESPACE_END