yosys/techlibs/common/prep.cc

/*
 *  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/celltypes.h"
#include "kernel/rtlil.h"
#include "kernel/log.h"

USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN

struct PrepPass : public ScriptPass
{
	PrepPass() : ScriptPass("prep", "generic synthesis script") { }

	virtual void help() YS_OVERRIDE
	{
		//   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
		log("\n");
		log("    prep [options]\n");
		log("\n");
		log("This command runs a conservative RTL synthesis. A typical application for this\n");
		log("is the preparation stage of a verification flow. This command does not operate\n");
		log("on partly selected designs.\n");
		log("\n");
		log("    -top <module>\n");
		log("        use the specified module as top module (default='top')\n");
		log("\n");
		log("    -flatten\n");
		log("        flatten the design before synthesis. this will pass '-auto-top' to\n");
		log("        'hierarchy' if no top module is specified.\n");
		log("\n");
		log("    -ifx\n");
		log("        passed to 'proc'. uses verilog simulation behavior for verilog if/case\n");
		log("        undef handling. this also prevents 'wreduce' from being run.\n");
		log("\n");
		log("    -nordff\n");
		log("        passed to 'memory_dff'. prohibits merging of FFs into memory read ports\n");
		log("\n");
		log("    -run <from_label>[:<to_label>]\n");
		log("        only run the commands between the labels (see below). an empty\n");
		log("        from label is synonymous to 'begin', and empty to label is\n");
		log("        synonymous to the end of the command list.\n");
		log("\n");
		log("\n");
		log("The following commands are executed by this synthesis command:\n");
		help_script();
		log("\n");
	}

	string top_module, fsm_opts, memory_opts;
	bool flatten, ifxmode;

	virtual void clear_flags() YS_OVERRIDE
	{
		top_module.clear();
		memory_opts.clear();
		flatten = false;
		ifxmode = false;
	}

	virtual void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
	{
		string run_from, run_to;

		size_t argidx;
		for (argidx = 1; argidx < args.size(); argidx++)
		{
			if (args[argidx] == "-top" && argidx+1 < args.size()) {
				top_module = args[++argidx];
				continue;
			}
			if (args[argidx] == "-run" && argidx+1 < args.size()) {
				size_t pos = args[argidx+1].find(':');
				if (pos == std::string::npos) {
					run_from = args[++argidx];
					run_to = args[argidx];
				} else {
					run_from = args[++argidx].substr(0, pos);
					run_to = args[argidx].substr(pos+1);
				}
				continue;
			}
			if (args[argidx] == "-flatten") {
				flatten = true;
				continue;
			}
			if (args[argidx] == "-ifx") {
				ifxmode = true;
				continue;
			}
			if (args[argidx] == "-nordff") {
				memory_opts += " -nordff";
				continue;
			}
			break;
		}
		extra_args(args, argidx, design);

		if (!design->full_selection())
			log_cmd_error("This comannd only operates on fully selected designs!\n");

		log_header(design, "Executing PREP pass.\n");
		log_push();

		run_script(design, run_from, run_to);

		log_pop();
	}

	virtual void script() YS_OVERRIDE
	{

		if (check_label("begin"))
		{
			if (help_mode) {
				run("hierarchy -check [-top <top>]");
			} else {
				if (top_module.empty()) {
					if (flatten)
						run("hierarchy -check -auto-top");
					else
						run("hierarchy -check");
				} else
					run(stringf("hierarchy -check -top %s", top_module.c_str()));
			}
		}

		if (check_label("coarse"))
		{
			run(ifxmode ? "proc -ifx" : "proc");
			if (help_mode || flatten)
				run("flatten", "(if -flatten)");
			run("opt_expr -keepdc");
			run("opt_clean");
			run("check");
			run("opt -keepdc");
			if (!ifxmode)
				run("wreduce");
			run("memory_dff" + (help_mode ? " [-nordff]" : memory_opts));
			run("opt_clean");
			run("memory_collect");
			run("opt -keepdc -fast");
		}

		if (check_label("check"))
		{
			run("stat");
			run("check");
		}
	}
} PrepPass;

PRIVATE_NAMESPACE_END