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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Claire Xenia Wolf <claire@yosyshq.com>
*
* 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/register.h"
#include "kernel/log.h"
#include <stdlib.h>
#include <stdio.h>
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
struct FsmPass : public Pass {
FsmPass() : Pass("fsm", "extract and optimize finite state machines") { }
void help() override
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" fsm [options] [selection]\n");
log("\n");
log("This pass calls all the other fsm_* passes in a useful order. This performs\n");
log("FSM extraction and optimization. It also calls opt_clean as needed:\n");
log("\n");
log(" fsm_detect unless got option -nodetect\n");
log(" fsm_extract\n");
log("\n");
log(" fsm_opt\n");
log(" opt_clean\n");
log(" fsm_opt\n");
log("\n");
log(" fsm_expand if got option -expand\n");
log(" opt_clean if got option -expand\n");
log(" fsm_opt if got option -expand\n");
log("\n");
log(" fsm_recode unless got option -norecode\n");
log("\n");
log(" fsm_info\n");
log("\n");
log(" fsm_export if got option -export\n");
log(" fsm_map unless got option -nomap\n");
log("\n");
log("Options:\n");
log("\n");
log(" -expand, -norecode, -export, -nomap\n");
log(" enable or disable passes as indicated above\n");
log("\n");
log(" -fullexpand\n");
log(" call expand with -full option\n");
log("\n");
log(" -encoding type\n");
log(" -fm_set_fsm_file file\n");
log(" -encfile file\n");
log(" passed through to fsm_recode pass\n");
log("\n");
log("This pass uses a subset of FF types to detect FSMs. Run 'opt -nosdff -nodffe'\n");
log("before this pass to prepare the design.\n");
log("\n");
#ifdef YOSYS_ENABLE_VERIFIC
log("The Verific frontend may merge multiplexers in a way that interferes with FSM\n");
log("detection. Run 'verific -cfg db_infer_wide_muxes_post_elaboration 0' before\n");
log("reading the source, and 'bmuxmap' after 'proc' for best results.\n");
log("\n");
#endif
}
void execute(std::vector<std::string> args, RTLIL::Design *design) override
{
bool flag_nomap = false;
bool flag_norecode = false;
bool flag_nodetect = false;
bool flag_expand = false;
bool flag_fullexpand = false;
bool flag_export = false;
std::string fm_set_fsm_file_opt;
std::string encfile_opt;
std::string encoding_opt;
log_header(design, "Executing FSM pass (extract and optimize FSM).\n");
log_push();
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++) {
std::string arg = args[argidx];
if (arg == "-fm_set_fsm_file" && argidx+1 < args.size() && fm_set_fsm_file_opt.empty()) {
fm_set_fsm_file_opt = " -fm_set_fsm_file " + args[++argidx];
continue;
}
if (arg == "-encfile" && argidx+1 < args.size() && encfile_opt.empty()) {
encfile_opt = " -encfile " + args[++argidx];
continue;
}
if (arg == "-encoding" && argidx+1 < args.size() && encoding_opt.empty()) {
encoding_opt = " -encoding " + args[++argidx];
continue;
}
if (arg == "-nodetect") {
flag_nodetect = true;
continue;
}
if (arg == "-norecode") {
flag_norecode = true;
continue;
}
if (arg == "-nomap") {
flag_nomap = true;
continue;
}
if (arg == "-expand") {
flag_expand = true;
continue;
}
if (arg == "-fullexpand") {
flag_fullexpand = true;
continue;
}
if (arg == "-export") {
flag_export = true;
continue;
}
break;
}
extra_args(args, argidx, design);
if (!flag_nodetect)
Pass::call(design, "fsm_detect");
Pass::call(design, "fsm_extract");
Pass::call(design, "fsm_opt");
Pass::call(design, "opt_clean");
Pass::call(design, "fsm_opt");
if (flag_expand || flag_fullexpand) {
Pass::call(design, flag_fullexpand ? "fsm_expand -full" : "fsm_expand");
Pass::call(design, "opt_clean");
Pass::call(design, "fsm_opt");
}
if (!flag_norecode)
Pass::call(design, "fsm_recode" + fm_set_fsm_file_opt + encfile_opt + encoding_opt);
Pass::call(design, "fsm_info");
if (flag_export)
Pass::call(design, "fsm_export");
if (!flag_nomap)
Pass::call(design, "fsm_map");
log_pop();
}
} FsmPass;
PRIVATE_NAMESPACE_END
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