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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2021 Symbiflow Authors
*
*
* 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 SITE_ROUTING_CACHE_H
#define SITE_ROUTING_CACHE_H
#include "PhysicalNetlist.capnp.h"
#include "hash_table.h"
#include "nextpnr_namespaces.h"
#include "site_arch.h"
#include "site_routing_storage.h"
NEXTPNR_NAMESPACE_BEGIN
struct SiteRoutingSolution
{
void store_solution(const SiteArch *ctx, const RouteNodeStorage *node_storage, const SiteWire &driver,
std::vector<size_t> solutions);
void verify(const SiteArch *ctx, const SiteNetInfo &net);
void clear()
{
solution_offsets.clear();
solution_storage.clear();
solution_sinks.clear();
inverted.clear();
can_invert.clear();
}
size_t num_solutions() const { return solution_sinks.size(); }
const SiteWire &solution_sink(size_t solution) const { return solution_sinks.at(solution); }
std::vector<SitePip>::const_iterator solution_begin(size_t solution) const
{
NPNR_ASSERT(solution + 1 < solution_offsets.size());
return solution_storage.begin() + solution_offsets.at(solution);
}
std::vector<SitePip>::const_iterator solution_end(size_t solution) const
{
NPNR_ASSERT(solution + 1 < solution_offsets.size());
return solution_storage.begin() + solution_offsets.at(solution + 1);
}
bool solution_inverted(size_t solution) const { return inverted.at(solution) != 0; }
bool solution_can_invert(size_t solution) const { return can_invert.at(solution) != 0; }
std::vector<size_t> solution_offsets;
std::vector<SitePip> solution_storage;
std::vector<SiteWire> solution_sinks;
std::vector<uint8_t> inverted;
std::vector<uint8_t> can_invert;
};
struct SiteRoutingKey
{
int32_t tile_type;
int32_t site;
// The net type matters for site routing. Legal routes for VCC/GND/SIGNAL
// nets are different.
PhysicalNetlist::PhysNetlist::NetType net_type;
SiteWire::Type driver_type;
int32_t driver_index;
std::vector<SiteWire::Type> user_types;
std::vector<int32_t> user_indicies;
bool operator==(const SiteRoutingKey &other) const
{
return tile_type == other.tile_type && site == other.site && net_type == other.net_type &&
driver_type == other.driver_type && driver_index == other.driver_index &&
user_types == other.user_types && user_indicies == other.user_indicies;
}
bool operator!=(const SiteRoutingKey &other) const
{
return tile_type != other.tile_type || site != other.site || net_type != other.net_type ||
driver_type != other.driver_type || driver_index != other.driver_index ||
user_types != other.user_types || user_indicies != other.user_indicies;
}
static SiteRoutingKey make(const SiteArch *ctx, const SiteNetInfo &site_net);
};
NEXTPNR_NAMESPACE_END
template <> struct std::hash<NEXTPNR_NAMESPACE_PREFIX SiteRoutingKey>
{
std::size_t operator()(const NEXTPNR_NAMESPACE_PREFIX SiteRoutingKey &key) const noexcept
{
std::size_t seed = 0;
boost::hash_combine(seed, std::hash<int32_t>()(key.tile_type));
boost::hash_combine(seed, std::hash<int32_t>()(key.site));
boost::hash_combine(seed, std::hash<PhysicalNetlist::PhysNetlist::NetType>()(key.net_type));
boost::hash_combine(seed, std::hash<NEXTPNR_NAMESPACE_PREFIX SiteWire::Type>()(key.driver_type));
boost::hash_combine(seed, std::hash<int32_t>()(key.driver_index));
boost::hash_combine(seed, std::hash<std::size_t>()(key.user_types.size()));
for (NEXTPNR_NAMESPACE_PREFIX SiteWire::Type user_type : key.user_types) {
boost::hash_combine(seed, std::hash<NEXTPNR_NAMESPACE_PREFIX SiteWire::Type>()(user_type));
}
boost::hash_combine(seed, std::hash<std::size_t>()(key.user_indicies.size()));
for (int32_t index : key.user_indicies) {
boost::hash_combine(seed, std::hash<int32_t>()(index));
}
return seed;
}
};
NEXTPNR_NAMESPACE_BEGIN
// Provides an LRU cache for site routing solutions.
class SiteRoutingCache
{
public:
bool get_solution(const SiteArch *ctx, const SiteNetInfo &net, SiteRoutingSolution *solution) const;
void add_solutions(const SiteArch *ctx, const SiteNetInfo &net, const SiteRoutingSolution &solution);
private:
HashTables::HashMap<SiteRoutingKey, SiteRoutingSolution> cache_;
};
NEXTPNR_NAMESPACE_END
#endif /* SITE_ROUTING_CACHE_H */
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