yosys/passes/memory/memory_nordff.cc

/*
 *  yosys -- Yosys Open SYnthesis Suite
 *
 *  Copyright (C) 2012  Claire Xenia Wolf <claire@yosyshq.com>
 *
 *  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/yosys.h"
#include "kernel/sigtools.h"
#include "kernel/mem.h"

USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN

struct MemoryNordffPass : public Pass {
	MemoryNordffPass() : Pass("memory_nordff", "extract read port FFs from memories") { }
	void help() override
	{
		//   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
		log("\n");
		log("    memory_nordff [options] [selection]\n");
		log("\n");
		log("This pass extracts FFs from memory read ports. This results in a netlist\n");
		log("similar to what one would get from not calling memory_dff.\n");
		log("\n");
	}
	void execute(std::vector<std::string> args, RTLIL::Design *design) override
	{
		log_header(design, "Executing MEMORY_NORDFF pass (extracting $dff cells from memories).\n");

		size_t argidx;
		for (argidx = 1; argidx < args.size(); argidx++) {
			// if (args[argidx] == "-nordff" || args[argidx] == "-wr_only") {
			// 	flag_wr_only = true;
			// 	continue;
			// }
			break;
		}
		extra_args(args, argidx, design);

		for (auto module : design->selected_modules())
		{
			SigMap sigmap(module);
			FfInitVals initvals(&sigmap, module);
			for (auto &mem : Mem::get_selected_memories(module))
			{
				bool changed = false;
				for (int i = 0; i < GetSize(mem.rd_ports); i++) {
					if (mem.rd_ports[i].clk_enable) {
						mem.extract_rdff(i, &initvals);
						changed = true;
					}
				}

				if (changed)
					mem.emit();
			}
		}
	}
} MemoryNordffPass;

PRIVATE_NAMESPACE_END