Added API for generic cell cost calculations

kernel/cost.h

@@ -0,0 +1,84 @@
+/*
+ *  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.
+ *
+ */
+
+#ifndef COST_H
+#define COST_H
+
+#include <kernel/yosys.h>
+
+YOSYS_NAMESPACE_BEGIN
+
+int get_cell_cost(RTLIL::Cell *cell, std::map<RTLIL::Module*, int> *mod_cost_cache = nullptr);
+
+int get_cell_cost(RTLIL::IdString type, const std::map<RTLIL::IdString, RTLIL::Const> &parameters = std::map<RTLIL::IdString, RTLIL::Const>(),
+		RTLIL::Design *design = nullptr, std::map<RTLIL::Module*, int> *mod_cost_cache = nullptr)
+{
+	static std::map<RTLIL::IdString, int> gate_cost = {
+		{ "$_BUF_",   1 },
+		{ "$_NOT_",   2 },
+		{ "$_AND_",   4 },
+		{ "$_NAND_",  4 },
+		{ "$_OR_",    4 },
+		{ "$_NOR_",   4 },
+		{ "$_XOR_",   8 },
+		{ "$_XNOR_",  8 },
+		{ "$_AOI3_",  6 },
+		{ "$_OAI3_",  6 },
+		{ "$_AOI4_",  8 },
+		{ "$_OAI4_",  8 },
+		{ "$_MUX_",   4 }
+	};
+
+	if (gate_cost.count(type))
+		return gate_cost.at(type);
+
+	if (parameters.empty() && design && design->module(type))
+	{
+		RTLIL::Module *mod = design->module(type);
+
+		if (mod->attributes.count("\\cost"))
+			return mod->attributes.at("\\cost").as_int();
+
+		std::map<RTLIL::Module*, int> local_mod_cost_cache;
+		if (mod_cost_cache == nullptr)
+			mod_cost_cache = &local_mod_cost_cache;
+
+		if (mod_cost_cache->count(mod))
+			return mod_cost_cache->at(mod);
+
+		int module_cost = 1;
+		for (auto c : mod->cells())
+			module_cost += get_cell_cost(c, mod_cost_cache);
+
+		(*mod_cost_cache)[mod] = module_cost;
+		return module_cost;
+	}
+
+	log("Warning: Can't determine cost of %s cell (%d parameters).\n", log_id(type), SIZE(parameters));
+	return 1;
+}
+
+int get_cell_cost(RTLIL::Cell *cell, std::map<RTLIL::Module*, int> *mod_cost_cache)
+{
+	return get_cell_cost(cell->type, cell->parameters, cell->module->design, mod_cost_cache);
+}
+
+YOSYS_NAMESPACE_END
+
+#endif