diff options
Diffstat (limited to 'passes/fsm/fsm_recode.cc')
-rw-r--r-- | passes/fsm/fsm_recode.cc | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/passes/fsm/fsm_recode.cc b/passes/fsm/fsm_recode.cc new file mode 100644 index 000000000..5e258f269 --- /dev/null +++ b/passes/fsm/fsm_recode.cc @@ -0,0 +1,114 @@ +/* + * 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 <string.h> + +static void fm_set_fsm_print(RTLIL::Cell *cell, RTLIL::Module *module, FsmData &fsm_data, const char *prefix, FILE *f) +{ + fprintf(f, "set_fsm_state_vector {"); + for (int i = fsm_data.state_bits-1; i >= 0; i--) + fprintf(f, " %s_reg[%d]", cell->parameters["\\NAME"].str[0] == '\\' ? + cell->parameters["\\NAME"].str.substr(1).c_str() : cell->parameters["\\NAME"].str.c_str(), i); + fprintf(f, " } -name {%s_%s} {%s:/WORK/%s}\n", + prefix, RTLIL::unescape_id(cell->parameters["\\NAME"].str).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(cell->parameters["\\NAME"].str).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) +{ + FsmData fsm_data; + fsm_data.copy_from_cell(cell); + + log("Recoding FSM `%s' from module `%s':\n", cell->name.c_str(), module->name.c_str()); + + if (fm_set_fsm_file != NULL) + fm_set_fsm_print(cell, module, fsm_data, "r", fm_set_fsm_file); + + fsm_data.state_bits = fsm_data.state_table.size(); + if (fsm_data.reset_state >= 0) + fsm_data.state_bits--; + + int bit_pos = 0; + for (size_t i = 0; i < fsm_data.state_table.size(); i++) + { + RTLIL::Const new_code; + if (int(i) == fsm_data.reset_state) + new_code = RTLIL::Const(RTLIL::State::S0, fsm_data.state_bits); + else { + RTLIL::Const state_code(RTLIL::State::Sa, fsm_data.state_bits); + state_code.bits[bit_pos++] = RTLIL::State::S1; + new_code = state_code; + } + + 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") { } + virtual void execute(std::vector<std::string> args, RTLIL::Design *design) + { + FILE *fm_set_fsm_file = NULL; + + 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; + } + break; + } + extra_args(args, argidx, design); + + for (auto &mod_it : design->modules) + for (auto &cell_it : mod_it.second->cells) + if (cell_it.second->type == "$fsm") + fsm_recode(cell_it.second, mod_it.second, fm_set_fsm_file); + + if (fm_set_fsm_file != NULL) + fclose(fm_set_fsm_file); + } +} FsmRecodePass; + |