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/*
* 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/sigtools.h"
#include "kernel/consteval.h"
#include "kernel/celltypes.h"
#include "fsmdata.h"
#include <math.h>
#include <string.h>
#include <errno.h>
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
static void fm_set_fsm_print(RTLIL::Cell *cell, RTLIL::Module *module, FsmData &fsm_data, const char *prefix, FILE *f)
{
std::string name = cell->parameters["\\NAME"].decode_string();
fprintf(f, "set_fsm_state_vector {");
for (int i = fsm_data.state_bits-1; i >= 0; i--)
fprintf(f, " %s_reg[%d]", name[0] == '\\' ? name.substr(1).c_str() : name.c_str(), i);
fprintf(f, " } -name {%s_%s} {%s:/WORK/%s}\n", prefix, RTLIL::unescape_id(name).c_str(),
prefix, RTLIL::unescape_id(module->name).c_str());
fprintf(f, "set_fsm_encoding {");
for (size_t i = 0; i < fsm_data.state_table.size(); i++) {
fprintf(f, " s%zd=2#", i);
for (int j = int(fsm_data.state_table[i].bits.size())-1; j >= 0; j--)
fprintf(f, "%c", fsm_data.state_table[i].bits[j] == RTLIL::State::S1 ? '1' : '0');
}
fprintf(f, " } -name {%s_%s} {%s:/WORK/%s}\n",
prefix, RTLIL::unescape_id(name).c_str(),
prefix, RTLIL::unescape_id(module->name).c_str());
}
static void fsm_recode(RTLIL::Cell *cell, RTLIL::Module *module, FILE *fm_set_fsm_file, std::string default_encoding)
{
std::string encoding = cell->attributes.count("\\fsm_encoding") ? cell->attributes.at("\\fsm_encoding").decode_string() : "auto";
log("Recoding FSM `%s' from module `%s' using `%s' encoding:\n", cell->name.c_str(), module->name.c_str(), encoding.c_str());
if (encoding != "none" && encoding != "one-hot" && encoding != "binary" && encoding != "auto") {
log(" unknown encoding `%s': using auto instead.\n", encoding.c_str());
encoding = "auto";
}
if (encoding == "none") {
log(" nothing to do for encoding `none'.\n");
return;
}
FsmData fsm_data;
fsm_data.copy_from_cell(cell);
if (fm_set_fsm_file != NULL)
fm_set_fsm_print(cell, module, fsm_data, "r", fm_set_fsm_file);
if (encoding == "auto") {
if (!default_encoding.empty())
encoding = default_encoding;
else
encoding = GetSize(fsm_data.state_table) < 32 ? "one-hot" : "binary";
log(" mapping auto encoding to `%s` for this FSM.\n", encoding.c_str());
}
if (encoding == "one-hot") {
fsm_data.state_bits = fsm_data.state_table.size();
} else
if (encoding == "binary") {
int new_num_state_bits = ceil(log2(fsm_data.state_table.size()));
if (fsm_data.state_bits == new_num_state_bits) {
log(" existing encoding is already a packed binary encoding.\n");
return;
}
fsm_data.state_bits = new_num_state_bits;
} else
log_error("FSM encoding `%s' is not supported!\n", encoding.c_str());
int state_idx_counter = fsm_data.reset_state >= 0 ? 1 : 0;
for (int i = 0; i < int(fsm_data.state_table.size()); i++)
{
int state_idx = fsm_data.reset_state == i ? 0 : state_idx_counter++;
RTLIL::Const new_code;
if (encoding == "one-hot") {
new_code = RTLIL::Const(RTLIL::State::Sa, fsm_data.state_bits);
new_code.bits[state_idx] = RTLIL::State::S1;
} else
if (encoding == "binary") {
new_code = RTLIL::Const(state_idx, fsm_data.state_bits);
} else
log_abort();
log(" %s -> %s\n", fsm_data.state_table[i].as_string().c_str(), new_code.as_string().c_str());
fsm_data.state_table[i] = new_code;
}
if (fm_set_fsm_file != NULL)
fm_set_fsm_print(cell, module, fsm_data, "i", fm_set_fsm_file);
fsm_data.copy_to_cell(cell);
}
struct FsmRecodePass : public Pass {
FsmRecodePass() : Pass("fsm_recode", "recoding finite state machines") { }
virtual void help()
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" fsm_recode [-encoding type] [-fm_set_fsm_file file] [selection]\n");
log("\n");
log("This pass reassign the state encodings for FSM cells. At the moment only\n");
log("one-hot encoding and binary encoding is supported. The option -encoding\n");
log("can be used to specify the encoding scheme used for FSMs without the\n");
log("`fsm_encoding' attribute (or with the attribute set to `auto'.\n");
log("\n");
log("The option -fm_set_fsm_file can be used to generate a file containing the\n");
log("mapping from old to new FSM encoding in form of Synopsys Formality set_fsm_*\n");
log("commands.\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
{
FILE *fm_set_fsm_file = NULL;
std::string default_encoding;
log_header("Executing FSM_RECODE pass (re-assigning FSM state encoding).\n");
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 == NULL) {
fm_set_fsm_file = fopen(args[++argidx].c_str(), "w");
if (fm_set_fsm_file == NULL)
log_error("Can't open fm_set_fsm_file `%s' for writing: %s\n", args[argidx].c_str(), strerror(errno));
continue;
}
if (arg == "-encoding" && argidx+1 < args.size() && fm_set_fsm_file == NULL) {
default_encoding = args[++argidx];
continue;
}
break;
}
extra_args(args, argidx, design);
for (auto &mod_it : design->modules_)
if (design->selected(mod_it.second))
for (auto &cell_it : mod_it.second->cells_)
if (cell_it.second->type == "$fsm" && design->selected(mod_it.second, cell_it.second))
fsm_recode(cell_it.second, mod_it.second, fm_set_fsm_file, default_encoding);
if (fm_set_fsm_file != NULL)
fclose(fm_set_fsm_file);
}
} FsmRecodePass;
PRIVATE_NAMESPACE_END
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