cost.h File Reference

#include <kernel/yosys.h>

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Functions
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)

Function Documentation

int get_cell_cost	(	RTLIL::Cell *	cell,
		std::map< RTLIL::Module *, int > *	mod_cost_cache = nullptr
	)

Definition at line 77 of file cost.h.

{
    return get_cell_cost(cell->type, cell->parameters, cell->module->design, mod_cost_cache);
}

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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
	)

Definition at line 29 of file cost.h.

{
    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), GetSize(parameters));
    return 1;
}

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