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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/register.h"
#include "kernel/log.h"
#include <stdlib.h>
#include <stdio.h>
struct OptPass : public Pass {
OptPass() : Pass("opt", "perform simple optimizations") { }
virtual void help()
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" opt [options] [selection]\n");
log("\n");
log("This pass calls all the other opt_* passes in a useful order. This performs\n");
log("a series of trivial optimizations and cleanups. This pass executes the other\n");
log("passes in the following order:\n");
log("\n");
log(" opt_const [-mux_undef] [-mux_bool] [-undriven] [-fine] [-keepdc]\n");
log(" opt_share -nomux\n");
log("\n");
log(" do\n");
log(" opt_muxtree\n");
log(" opt_reduce [-fine]\n");
log(" opt_share\n");
log(" opt_rmdff\n");
log(" opt_clean [-purge]\n");
log(" opt_const [-mux_undef] [-mux_bool] [-undriven] [-fine] [-keepdc]\n");
log(" while <changed design>\n");
log("\n");
log("When called with -fast the following script is used instead:\n");
log("\n");
log(" do\n");
log(" opt_const [-mux_undef] [-mux_bool] [-undriven] [-fine] [-keepdc]\n");
log(" opt_share\n");
log(" opt_rmdff\n");
log(" opt_clean [-purge]\n");
log(" while <changed design in opt_rmdff>\n");
log("\n");
log("Note: Options in square brackets (such as [-keepdc]) are passed through to\n");
log("the opt_* commands when given to 'opt'.\n");
log("\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
{
std::string opt_clean_args;
std::string opt_const_args;
std::string opt_reduce_args;
bool fast_mode = false;
log_header("Executing OPT pass (performing simple optimizations).\n");
log_push();
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++) {
if (args[argidx] == "-purge") {
opt_clean_args += " -purge";
continue;
}
if (args[argidx] == "-mux_undef") {
opt_const_args += " -mux_undef";
continue;
}
if (args[argidx] == "-mux_bool") {
opt_const_args += " -mux_bool";
continue;
}
if (args[argidx] == "-undriven") {
opt_const_args += " -undriven";
continue;
}
if (args[argidx] == "-fine") {
opt_const_args += " -fine";
opt_reduce_args += " -fine";
continue;
}
if (args[argidx] == "-keepdc") {
opt_const_args += " -keepdc";
continue;
}
if (args[argidx] == "-fast") {
fast_mode = true;
continue;
}
break;
}
extra_args(args, argidx, design);
if (fast_mode)
{
while (1) {
Pass::call(design, "opt_const" + opt_const_args);
Pass::call(design, "opt_share");
design->scratchpad_unset("opt.did_something");
Pass::call(design, "opt_rmdff");
if (design->scratchpad_get_bool("opt.did_something") == false)
break;
Pass::call(design, "opt_clean" + opt_clean_args);
log_header("Rerunning OPT passes. (Removed registers in this run.)\n");
}
Pass::call(design, "opt_clean" + opt_clean_args);
}
else
{
Pass::call(design, "opt_const" + opt_const_args);
Pass::call(design, "opt_share -nomux");
while (1) {
design->scratchpad_unset("opt.did_something");
Pass::call(design, "opt_muxtree");
Pass::call(design, "opt_reduce" + opt_reduce_args);
Pass::call(design, "opt_share");
Pass::call(design, "opt_rmdff");
Pass::call(design, "opt_clean" + opt_clean_args);
Pass::call(design, "opt_const" + opt_const_args);
if (design->scratchpad_get_bool("opt.did_something") == false)
break;
log_header("Rerunning OPT passes. (Maybe there is more to do..)\n");
}
}
log_header(fast_mode ? "Finished fast OPT passes." : "Finished OPT passes. (There is nothing left to do.)\n");
log_pop();
}
} OptPass;
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