mirror of https://github.com/YosysHQ/yosys.git
663 lines
18 KiB
C++
663 lines
18 KiB
C++
/*
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* yosys -- Yosys Open SYnthesis Suite
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*
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* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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#include "kernel/yosys.h"
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#include "kernel/sigtools.h"
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USING_YOSYS_NAMESPACE
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PRIVATE_NAMESPACE_BEGIN
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#define COST_MUX2 100
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#define COST_MUX4 220
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#define COST_MUX8 460
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#define COST_MUX16 940
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struct MuxcoverWorker
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{
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Module *module;
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SigMap sigmap;
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struct newmux_t
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{
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int cost;
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vector<SigBit> inputs, selects;
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newmux_t() : cost(0) {}
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};
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struct tree_t
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{
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SigBit root;
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dict<SigBit, Cell*> muxes;
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dict<SigBit, newmux_t> newmuxes;
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};
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vector<tree_t> tree_list;
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dict<tuple<SigBit, SigBit, SigBit>, tuple<SigBit, pool<SigBit>, bool>> decode_mux_cache;
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dict<SigBit, tuple<SigBit, SigBit, SigBit>> decode_mux_reverse_cache;
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int decode_mux_counter;
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bool use_mux4;
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bool use_mux8;
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bool use_mux16;
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bool nodecode;
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int cost_mux2;
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int cost_mux4;
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int cost_mux8;
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int cost_mux16;
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MuxcoverWorker(Module *module) : module(module), sigmap(module)
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{
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use_mux4 = false;
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use_mux8 = false;
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use_mux16 = false;
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nodecode = false;
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cost_mux2 = COST_MUX2;
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cost_mux4 = COST_MUX4;
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cost_mux8 = COST_MUX8;
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cost_mux16 = COST_MUX16;
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decode_mux_counter = 0;
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}
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void treeify()
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{
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pool<SigBit> roots;
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pool<SigBit> used_once;
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dict<SigBit, Cell*> sig_to_mux;
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for (auto wire : module->wires()) {
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if (!wire->port_output)
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continue;
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for (auto bit : sigmap(wire))
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roots.insert(bit);
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}
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for (auto cell : module->cells()) {
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for (auto conn : cell->connections()) {
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if (!cell->input(conn.first))
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continue;
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for (auto bit : sigmap(conn.second)) {
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if (used_once.count(bit) || cell->type != "$_MUX_" || conn.first == "\\S")
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roots.insert(bit);
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used_once.insert(bit);
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}
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}
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if (cell->type == "$_MUX_")
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sig_to_mux[sigmap(cell->getPort("\\Y"))] = cell;
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}
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log(" Treeifying %d MUXes:\n", GetSize(sig_to_mux));
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roots.sort();
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for (auto rootsig : roots)
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{
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tree_t tree;
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tree.root = rootsig;
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pool<SigBit> wavefront;
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wavefront.insert(rootsig);
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while (!wavefront.empty()) {
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SigBit bit = wavefront.pop();
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if (sig_to_mux.count(bit) && (bit == rootsig || !roots.count(bit))) {
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Cell *c = sig_to_mux.at(bit);
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tree.muxes[bit] = c;
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wavefront.insert(sigmap(c->getPort("\\A")));
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wavefront.insert(sigmap(c->getPort("\\B")));
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}
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}
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if (!tree.muxes.empty()) {
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log(" Found tree with %d MUXes at root %s.\n", GetSize(tree.muxes), log_signal(tree.root));
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tree_list.push_back(tree);
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}
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}
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log(" Finished treeification: Found %d trees.\n", GetSize(tree_list));
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}
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bool follow_muxtree(SigBit &ret_bit, tree_t &tree, SigBit bit, const char *path)
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{
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if (*path) {
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if (tree.muxes.count(bit) == 0)
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return false;
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char port_name[3] = {'\\', *path, 0};
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return follow_muxtree(ret_bit, tree, sigmap(tree.muxes.at(bit)->getPort(port_name)), path+1);
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} else {
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ret_bit = bit;
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return true;
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}
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}
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int prepare_decode_mux(SigBit &A, SigBit B, SigBit sel, SigBit bit)
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{
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if (A == B)
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return 0;
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tuple<SigBit, SigBit, SigBit> key(A, B, sel);
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if (decode_mux_cache.count(key) == 0) {
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auto &entry = decode_mux_cache[key];
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std::get<0>(entry) = module->addWire(NEW_ID);
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std::get<2>(entry) = false;
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decode_mux_reverse_cache[std::get<0>(entry)] = key;
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}
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auto &entry = decode_mux_cache[key];
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A = std::get<0>(entry);
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std::get<1>(entry).insert(bit);
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if (std::get<2>(entry))
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return 0;
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return cost_mux2 / GetSize(std::get<1>(entry));
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}
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void implement_decode_mux(SigBit ctrl_bit)
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{
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if (decode_mux_reverse_cache.count(ctrl_bit) == 0)
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return;
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auto &key = decode_mux_reverse_cache.at(ctrl_bit);
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auto &entry = decode_mux_cache[key];
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if (std::get<2>(entry))
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return;
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implement_decode_mux(std::get<0>(key));
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implement_decode_mux(std::get<1>(key));
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module->addMuxGate(NEW_ID, std::get<0>(key), std::get<1>(key), std::get<2>(key), ctrl_bit);
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std::get<2>(entry) = true;
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decode_mux_counter++;
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}
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int find_best_cover(tree_t &tree, SigBit bit)
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{
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if (tree.newmuxes.count(bit)) {
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return tree.newmuxes.at(bit).cost;
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}
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SigBit A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P;
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SigBit S1, S2, S3, S4, S5, S6, S7, S8;
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SigBit T1, T2, T3, T4;
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SigBit U1, U2;
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SigBit V1;
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newmux_t best_mux;
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bool ok = true;
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// 2-Input MUX
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ok = ok && follow_muxtree(A, tree, bit, "A");
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ok = ok && follow_muxtree(B, tree, bit, "B");
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ok = ok && follow_muxtree(S1, tree, bit, "S");
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if (ok)
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{
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newmux_t mux;
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mux.inputs.push_back(A);
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mux.inputs.push_back(B);
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mux.selects.push_back(S1);
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mux.cost += cost_mux2;
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mux.cost += find_best_cover(tree, A);
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mux.cost += find_best_cover(tree, B);
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best_mux = mux;
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}
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// 4-Input MUX
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if (use_mux4)
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{
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ok = ok && follow_muxtree(A, tree, bit, "AA");
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ok = ok && follow_muxtree(B, tree, bit, "AB");
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ok = ok && follow_muxtree(C, tree, bit, "BA");
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ok = ok && follow_muxtree(D, tree, bit, "BB");
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ok = ok && follow_muxtree(S1, tree, bit, "AS");
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ok = ok && follow_muxtree(S2, tree, bit, "BS");
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if (nodecode)
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ok = ok && S1 == S2;
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ok = ok && follow_muxtree(T1, tree, bit, "S");
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if (ok)
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{
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newmux_t mux;
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mux.inputs.push_back(A);
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mux.inputs.push_back(B);
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mux.inputs.push_back(C);
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mux.inputs.push_back(D);
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mux.cost += prepare_decode_mux(S1, S2, T1, bit);
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mux.selects.push_back(S1);
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mux.selects.push_back(T1);
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mux.cost += cost_mux4;
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mux.cost += find_best_cover(tree, A);
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mux.cost += find_best_cover(tree, B);
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mux.cost += find_best_cover(tree, C);
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mux.cost += find_best_cover(tree, D);
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if (best_mux.cost > mux.cost)
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best_mux = mux;
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}
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}
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// 8-Input MUX
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if (use_mux8)
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{
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ok = ok && follow_muxtree(A, tree, bit, "AAA");
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ok = ok && follow_muxtree(B, tree, bit, "AAB");
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ok = ok && follow_muxtree(C, tree, bit, "ABA");
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ok = ok && follow_muxtree(D, tree, bit, "ABB");
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ok = ok && follow_muxtree(E, tree, bit, "BAA");
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ok = ok && follow_muxtree(F, tree, bit, "BAB");
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ok = ok && follow_muxtree(G, tree, bit, "BBA");
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ok = ok && follow_muxtree(H, tree, bit, "BBB");
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ok = ok && follow_muxtree(S1, tree, bit, "AAS");
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ok = ok && follow_muxtree(S2, tree, bit, "ABS");
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ok = ok && follow_muxtree(S3, tree, bit, "BAS");
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ok = ok && follow_muxtree(S4, tree, bit, "BBS");
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if (nodecode)
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ok = ok && S1 == S2 && S2 == S3 && S3 == S4;
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ok = ok && follow_muxtree(T1, tree, bit, "AS");
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ok = ok && follow_muxtree(T2, tree, bit, "BS");
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if (nodecode)
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ok = ok && T1 == T2;
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ok = ok && follow_muxtree(U1, tree, bit, "S");
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if (ok)
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{
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newmux_t mux;
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mux.inputs.push_back(A);
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mux.inputs.push_back(B);
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mux.inputs.push_back(C);
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mux.inputs.push_back(D);
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mux.inputs.push_back(E);
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mux.inputs.push_back(F);
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mux.inputs.push_back(G);
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mux.inputs.push_back(H);
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mux.cost += prepare_decode_mux(S1, S2, T1, bit);
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mux.cost += prepare_decode_mux(S3, S4, T2, bit);
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mux.cost += prepare_decode_mux(S1, S3, U1, bit);
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mux.cost += prepare_decode_mux(T1, T2, U1, bit);
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mux.selects.push_back(S1);
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mux.selects.push_back(T1);
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mux.selects.push_back(U1);
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mux.cost += cost_mux8;
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mux.cost += find_best_cover(tree, A);
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mux.cost += find_best_cover(tree, B);
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mux.cost += find_best_cover(tree, C);
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mux.cost += find_best_cover(tree, D);
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mux.cost += find_best_cover(tree, E);
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mux.cost += find_best_cover(tree, F);
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mux.cost += find_best_cover(tree, G);
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mux.cost += find_best_cover(tree, H);
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if (best_mux.cost > mux.cost)
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best_mux = mux;
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}
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}
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// 16-Input MUX
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if (use_mux16)
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{
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ok = ok && follow_muxtree(A, tree, bit, "AAAA");
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ok = ok && follow_muxtree(B, tree, bit, "AAAB");
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ok = ok && follow_muxtree(C, tree, bit, "AABA");
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ok = ok && follow_muxtree(D, tree, bit, "AABB");
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ok = ok && follow_muxtree(E, tree, bit, "ABAA");
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ok = ok && follow_muxtree(F, tree, bit, "ABAB");
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ok = ok && follow_muxtree(G, tree, bit, "ABBA");
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ok = ok && follow_muxtree(H, tree, bit, "ABBB");
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ok = ok && follow_muxtree(I, tree, bit, "BAAA");
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ok = ok && follow_muxtree(J, tree, bit, "BAAB");
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ok = ok && follow_muxtree(K, tree, bit, "BABA");
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ok = ok && follow_muxtree(L, tree, bit, "BABB");
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ok = ok && follow_muxtree(M, tree, bit, "BBAA");
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ok = ok && follow_muxtree(N, tree, bit, "BBAB");
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ok = ok && follow_muxtree(O, tree, bit, "BBBA");
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ok = ok && follow_muxtree(P, tree, bit, "BBBB");
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ok = ok && follow_muxtree(S1, tree, bit, "AAAS");
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ok = ok && follow_muxtree(S2, tree, bit, "AABS");
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ok = ok && follow_muxtree(S3, tree, bit, "ABAS");
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ok = ok && follow_muxtree(S4, tree, bit, "ABBS");
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ok = ok && follow_muxtree(S5, tree, bit, "BAAS");
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ok = ok && follow_muxtree(S6, tree, bit, "BABS");
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ok = ok && follow_muxtree(S7, tree, bit, "BBAS");
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ok = ok && follow_muxtree(S8, tree, bit, "BBBS");
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if (nodecode)
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ok = ok && S1 == S2 && S2 == S3 && S3 == S4 && S4 == S5 && S5 == S6 && S6 == S7 && S7 == S8;
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ok = ok && follow_muxtree(T1, tree, bit, "AAS");
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ok = ok && follow_muxtree(T2, tree, bit, "ABS");
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ok = ok && follow_muxtree(T3, tree, bit, "BAS");
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ok = ok && follow_muxtree(T4, tree, bit, "BBS");
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if (nodecode)
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ok = ok && T1 == T2 && T2 == T3 && T3 == T4;
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ok = ok && follow_muxtree(U1, tree, bit, "AS");
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ok = ok && follow_muxtree(U2, tree, bit, "BS");
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if (nodecode)
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ok = ok && U1 == U2;
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ok = ok && follow_muxtree(V1, tree, bit, "S");
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if (ok)
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{
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newmux_t mux;
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mux.inputs.push_back(A);
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mux.inputs.push_back(B);
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mux.inputs.push_back(C);
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mux.inputs.push_back(D);
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mux.inputs.push_back(E);
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mux.inputs.push_back(F);
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mux.inputs.push_back(G);
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mux.inputs.push_back(H);
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mux.inputs.push_back(I);
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mux.inputs.push_back(J);
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mux.inputs.push_back(K);
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mux.inputs.push_back(L);
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mux.inputs.push_back(M);
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mux.inputs.push_back(N);
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mux.inputs.push_back(O);
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mux.inputs.push_back(P);
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mux.cost += prepare_decode_mux(S1, S2, T1, bit);
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mux.cost += prepare_decode_mux(S3, S4, T2, bit);
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mux.cost += prepare_decode_mux(S5, S6, T3, bit);
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mux.cost += prepare_decode_mux(S7, S8, T4, bit);
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mux.cost += prepare_decode_mux(S1, S3, U1, bit);
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mux.cost += prepare_decode_mux(S5, S7, U2, bit);
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mux.cost += prepare_decode_mux(S1, S5, V1, bit);
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mux.cost += prepare_decode_mux(T1, T2, U1, bit);
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mux.cost += prepare_decode_mux(T3, T4, U2, bit);
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mux.cost += prepare_decode_mux(T1, T3, V1, bit);
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mux.cost += prepare_decode_mux(U1, U2, V1, bit);
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mux.selects.push_back(S1);
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mux.selects.push_back(T1);
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mux.selects.push_back(U1);
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mux.selects.push_back(V1);
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mux.cost += cost_mux16;
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mux.cost += find_best_cover(tree, A);
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mux.cost += find_best_cover(tree, B);
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mux.cost += find_best_cover(tree, C);
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mux.cost += find_best_cover(tree, D);
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mux.cost += find_best_cover(tree, E);
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mux.cost += find_best_cover(tree, F);
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mux.cost += find_best_cover(tree, G);
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mux.cost += find_best_cover(tree, H);
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mux.cost += find_best_cover(tree, I);
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mux.cost += find_best_cover(tree, J);
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mux.cost += find_best_cover(tree, K);
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mux.cost += find_best_cover(tree, L);
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mux.cost += find_best_cover(tree, M);
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mux.cost += find_best_cover(tree, N);
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mux.cost += find_best_cover(tree, O);
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mux.cost += find_best_cover(tree, P);
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if (best_mux.cost > mux.cost)
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best_mux = mux;
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}
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}
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tree.newmuxes[bit] = best_mux;
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return best_mux.cost;
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}
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void implement_best_cover(tree_t &tree, SigBit bit, int count_muxes_by_type[4])
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{
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newmux_t mux = tree.newmuxes.at(bit);
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for (auto inbit : mux.inputs)
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implement_best_cover(tree, inbit, count_muxes_by_type);
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for (auto selbit : mux.selects)
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implement_decode_mux(selbit);
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if (GetSize(mux.inputs) == 0)
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return;
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if (GetSize(mux.inputs) == 2) {
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count_muxes_by_type[0]++;
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Cell *cell = module->addCell(NEW_ID, "$_MUX_");
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cell->setPort("\\A", mux.inputs[0]);
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cell->setPort("\\B", mux.inputs[1]);
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cell->setPort("\\S", mux.selects[0]);
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cell->setPort("\\Y", bit);
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return;
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}
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|
if (GetSize(mux.inputs) == 4) {
|
|
count_muxes_by_type[1]++;
|
|
Cell *cell = module->addCell(NEW_ID, "$_MUX4_");
|
|
cell->setPort("\\A", mux.inputs[0]);
|
|
cell->setPort("\\B", mux.inputs[1]);
|
|
cell->setPort("\\C", mux.inputs[2]);
|
|
cell->setPort("\\D", mux.inputs[3]);
|
|
cell->setPort("\\S", mux.selects[0]);
|
|
cell->setPort("\\T", mux.selects[1]);
|
|
cell->setPort("\\Y", bit);
|
|
return;
|
|
}
|
|
|
|
if (GetSize(mux.inputs) == 8) {
|
|
count_muxes_by_type[2]++;
|
|
Cell *cell = module->addCell(NEW_ID, "$_MUX8_");
|
|
cell->setPort("\\A", mux.inputs[0]);
|
|
cell->setPort("\\B", mux.inputs[1]);
|
|
cell->setPort("\\C", mux.inputs[2]);
|
|
cell->setPort("\\D", mux.inputs[3]);
|
|
cell->setPort("\\E", mux.inputs[4]);
|
|
cell->setPort("\\F", mux.inputs[5]);
|
|
cell->setPort("\\G", mux.inputs[6]);
|
|
cell->setPort("\\H", mux.inputs[7]);
|
|
cell->setPort("\\S", mux.selects[0]);
|
|
cell->setPort("\\T", mux.selects[1]);
|
|
cell->setPort("\\U", mux.selects[2]);
|
|
cell->setPort("\\Y", bit);
|
|
return;
|
|
}
|
|
|
|
if (GetSize(mux.inputs) == 16) {
|
|
count_muxes_by_type[3]++;
|
|
Cell *cell = module->addCell(NEW_ID, "$_MUX16_");
|
|
cell->setPort("\\A", mux.inputs[0]);
|
|
cell->setPort("\\B", mux.inputs[1]);
|
|
cell->setPort("\\C", mux.inputs[2]);
|
|
cell->setPort("\\D", mux.inputs[3]);
|
|
cell->setPort("\\E", mux.inputs[4]);
|
|
cell->setPort("\\F", mux.inputs[5]);
|
|
cell->setPort("\\G", mux.inputs[6]);
|
|
cell->setPort("\\H", mux.inputs[7]);
|
|
cell->setPort("\\I", mux.inputs[8]);
|
|
cell->setPort("\\J", mux.inputs[9]);
|
|
cell->setPort("\\K", mux.inputs[10]);
|
|
cell->setPort("\\L", mux.inputs[11]);
|
|
cell->setPort("\\M", mux.inputs[12]);
|
|
cell->setPort("\\N", mux.inputs[13]);
|
|
cell->setPort("\\O", mux.inputs[14]);
|
|
cell->setPort("\\P", mux.inputs[15]);
|
|
cell->setPort("\\S", mux.selects[0]);
|
|
cell->setPort("\\T", mux.selects[1]);
|
|
cell->setPort("\\U", mux.selects[2]);
|
|
cell->setPort("\\V", mux.selects[3]);
|
|
cell->setPort("\\Y", bit);
|
|
return;
|
|
}
|
|
|
|
log_abort();
|
|
}
|
|
|
|
void treecover(tree_t &tree)
|
|
{
|
|
int count_muxes_by_type[4] = {0, 0, 0, 0};
|
|
find_best_cover(tree, tree.root);
|
|
implement_best_cover(tree, tree.root, count_muxes_by_type);
|
|
log(" Replaced tree at %s: %d MUX2, %d MUX4, %d MUX8, %d MUX16\n", log_signal(tree.root),
|
|
count_muxes_by_type[0], count_muxes_by_type[1], count_muxes_by_type[2], count_muxes_by_type[3]);
|
|
for (auto &it : tree.muxes)
|
|
module->remove(it.second);
|
|
}
|
|
|
|
void run()
|
|
{
|
|
log("Covering MUX trees in module %s..\n", log_id(module));
|
|
|
|
treeify();
|
|
|
|
log(" Covering trees:\n");
|
|
|
|
// pre-fill cache of decoder muxes
|
|
if (!nodecode)
|
|
for (auto &tree : tree_list) {
|
|
find_best_cover(tree, tree.root);
|
|
tree.newmuxes.clear();
|
|
}
|
|
|
|
for (auto &tree : tree_list)
|
|
treecover(tree);
|
|
|
|
if (!nodecode)
|
|
log(" Added a total of %d decoder MUXes.\n", decode_mux_counter);
|
|
}
|
|
};
|
|
|
|
struct MuxcoverPass : public Pass {
|
|
MuxcoverPass() : Pass("muxcover", "cover trees of MUX cells with wider MUXes") { }
|
|
void help() YS_OVERRIDE
|
|
{
|
|
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
|
|
log("\n");
|
|
log(" muxcover [options] [selection]\n");
|
|
log("\n");
|
|
log("Cover trees of $_MUX_ cells with $_MUX{4,8,16}_ cells\n");
|
|
log("\n");
|
|
log(" -mux4[=cost], -mux8[=cost], -mux16[=cost]\n");
|
|
log(" Use the specified types of MUXes (with optional integer costs). If none\n");
|
|
log(" of these options are given, the effect is the same as if all of them are.\n");
|
|
log(" Default costs: $_MUX_ = %d, $_MUX4_ = %d,\n", COST_MUX2, COST_MUX4);
|
|
log(" $_MUX8_ = %d, $_MUX16_ = %d\n", COST_MUX8, COST_MUX16);
|
|
log("\n");
|
|
log(" -nodecode\n");
|
|
log(" Do not insert decoder logic. This reduces the number of possible\n");
|
|
log(" substitutions, but guarantees that the resulting circuit is not\n");
|
|
log(" less efficient than the original circuit.\n");
|
|
log("\n");
|
|
}
|
|
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
|
|
{
|
|
log_header(design, "Executing MUXCOVER pass (mapping to wider MUXes).\n");
|
|
|
|
bool use_mux4 = false;
|
|
bool use_mux8 = false;
|
|
bool use_mux16 = false;
|
|
bool nodecode = false;
|
|
int cost_mux4 = COST_MUX4;
|
|
int cost_mux8 = COST_MUX8;
|
|
int cost_mux16 = COST_MUX16;
|
|
|
|
size_t argidx;
|
|
for (argidx = 1; argidx < args.size(); argidx++)
|
|
{
|
|
const auto &arg = args[argidx];
|
|
if (arg.size() >= 5 && arg.substr(0,5) == "-mux4") {
|
|
use_mux4 = true;
|
|
if (arg.size() > 5) {
|
|
if (arg[5] != '=') break;
|
|
cost_mux4 = atoi(arg.substr(6).c_str());
|
|
}
|
|
continue;
|
|
}
|
|
if (arg.size() >= 5 && arg.substr(0,5) == "-mux8") {
|
|
use_mux8 = true;
|
|
if (arg.size() > 5) {
|
|
if (arg[5] != '=') break;
|
|
cost_mux8 = atoi(arg.substr(6).c_str());
|
|
}
|
|
continue;
|
|
}
|
|
if (arg.size() >= 6 && arg.substr(0,6) == "-mux16") {
|
|
use_mux16 = true;
|
|
if (arg.size() > 6) {
|
|
if (arg[6] != '=') break;
|
|
cost_mux16 = atoi(arg.substr(7).c_str());
|
|
}
|
|
continue;
|
|
}
|
|
if (arg == "-nodecode") {
|
|
nodecode = true;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
extra_args(args, argidx, design);
|
|
|
|
if (!use_mux4 && !use_mux8 && !use_mux16) {
|
|
use_mux4 = true;
|
|
use_mux8 = true;
|
|
use_mux16 = true;
|
|
}
|
|
|
|
for (auto module : design->selected_modules())
|
|
{
|
|
MuxcoverWorker worker(module);
|
|
worker.use_mux4 = use_mux4;
|
|
worker.use_mux8 = use_mux8;
|
|
worker.use_mux16 = use_mux16;
|
|
worker.cost_mux4 = cost_mux4;
|
|
worker.cost_mux8 = cost_mux8;
|
|
worker.cost_mux16 = cost_mux16;
|
|
worker.nodecode = nodecode;
|
|
worker.run();
|
|
}
|
|
}
|
|
} MuxcoverPass;
|
|
|
|
PRIVATE_NAMESPACE_END
|