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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 "opt_status.h"
#include "kernel/register.h"
#include "kernel/log.h"
#include <stdlib.h>
#include <stdio.h>
bool OPT_DID_SOMETHING;
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 [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\n");
log(" opt_share -nomux\n");
log("\n");
log(" do\n");
log(" opt_muxtree\n");
log(" opt_reduce\n");
log(" opt_share\n");
log(" opt_rmdff\n");
log(" opt_clean\n");
log(" opt_const\n");
log(" while [changed design]\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
{
log_header("Executing OPT pass (performing simple optimizations).\n");
log_push();
extra_args(args, 1, design);
log_header("Optimizing in-memory representation of design.\n");
design->optimize();
Pass::call(design, "opt_const");
Pass::call(design, "opt_share -nomux");
while (1) {
OPT_DID_SOMETHING = false;
Pass::call(design, "opt_muxtree");
Pass::call(design, "opt_reduce");
Pass::call(design, "opt_share");
Pass::call(design, "opt_rmdff");
Pass::call(design, "opt_clean");
Pass::call(design, "opt_const");
if (OPT_DID_SOMETHING == false)
break;
log_header("Rerunning OPT passes. (Maybe there is more to do..)\n");
}
log_header("Optimizing in-memory representation of design.\n");
design->optimize();
log_header("Finished OPT passes. (There is nothing left to do.)\n");
log_pop();
}
} OptPass;
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