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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.
*
*/
#include "site_routing_cache.h"
#include "context.h"
#include "site_arch.impl.h"
NEXTPNR_NAMESPACE_BEGIN
void SiteRoutingSolution::store_solution(const SiteArch *ctx, const RouteNodeStorage *node_storage,
const SiteWire &driver, std::vector<size_t> solutions)
{
clear();
solution_sinks.reserve(solutions.size());
inverted.reserve(solutions.size());
can_invert.reserve(solutions.size());
for (size_t route : solutions) {
bool sol_inverted = false;
bool sol_can_invert = false;
SiteWire wire = node_storage->get_node(route)->wire;
solution_sinks.push_back(wire);
solution_offsets.push_back(solution_storage.size());
Node cursor = node_storage->get_node(route);
while (cursor.has_parent()) {
if (ctx->isInverting(cursor->pip) && !sol_can_invert) {
sol_inverted = !sol_inverted;
}
if (ctx->canInvert(cursor->pip)) {
sol_inverted = false;
sol_can_invert = true;
}
solution_storage.push_back(cursor->pip);
Node parent = cursor.parent();
NPNR_ASSERT(ctx->getPipDstWire(cursor->pip) == cursor->wire);
NPNR_ASSERT(ctx->getPipSrcWire(cursor->pip) == parent->wire);
cursor = parent;
}
inverted.push_back(sol_inverted);
can_invert.push_back(sol_can_invert);
NPNR_ASSERT(cursor->wire == driver);
}
solution_offsets.push_back(solution_storage.size());
}
void SiteRoutingSolution::verify(const SiteArch *ctx, const SiteNetInfo &net)
{
HashTables::HashSet<SiteWire> seen_users;
for (size_t i = 0; i < num_solutions(); ++i) {
SiteWire cursor = solution_sink(i);
NPNR_ASSERT(net.users.count(cursor) == 1);
seen_users.emplace(cursor);
auto begin = solution_begin(i);
auto end = solution_end(i);
for (auto iter = begin; iter != end; ++iter) {
SitePip pip = *iter;
NPNR_ASSERT(ctx->getPipDstWire(pip) == cursor);
cursor = ctx->getPipSrcWire(pip);
}
NPNR_ASSERT(net.driver == cursor);
}
NPNR_ASSERT(seen_users.size() == net.users.size());
}
SiteRoutingKey SiteRoutingKey::make(const SiteArch *ctx, const SiteNetInfo &site_net)
{
SiteRoutingKey out;
out.tile_type = ctx->site_info->tile_type;
out.site = ctx->site_info->site;
out.net_type = ctx->ctx->get_net_type(site_net.net);
out.driver_type = site_net.driver.type;
if (site_net.driver.type == SiteWire::SITE_WIRE) {
out.driver_index = site_net.driver.wire.index;
} else {
NPNR_ASSERT(site_net.driver.type == SiteWire::OUT_OF_SITE_SOURCE);
out.driver_index = -1;
}
out.user_types.reserve(site_net.users.size());
out.user_indicies.reserve(site_net.users.size());
std::vector<SiteWire> users;
users.reserve(site_net.users.size());
users.insert(users.begin(), site_net.users.begin(), site_net.users.end());
std::sort(users.begin(), users.end());
for (const SiteWire &user : users) {
out.user_types.push_back(user.type);
if (user.type == SiteWire::SITE_WIRE) {
out.user_indicies.push_back(user.wire.index);
} else {
NPNR_ASSERT(user.type == SiteWire::OUT_OF_SITE_SINK);
out.user_indicies.push_back(-1);
}
}
return out;
}
bool SiteRoutingCache::get_solution(const SiteArch *ctx, const SiteNetInfo &net, SiteRoutingSolution *solution) const
{
SiteRoutingKey key = SiteRoutingKey::make(ctx, net);
auto iter = cache_.find(key);
if (iter == cache_.end()) {
return false;
}
*solution = iter->second;
const auto &tile_type_data = ctx->site_info->chip_info().tile_types[ctx->site_info->tile_type];
for (SiteWire &wire : solution->solution_sinks) {
switch (wire.type) {
case SiteWire::SITE_WIRE:
wire.wire.tile = ctx->site_info->tile;
break;
case SiteWire::OUT_OF_SITE_SOURCE:
wire.net = net.net;
break;
case SiteWire::OUT_OF_SITE_SINK:
wire.net = net.net;
break;
case SiteWire::SITE_PORT_SINK: {
const auto &pip_data = tile_type_data.pip_data[wire.pip.index];
wire.pip.tile = ctx->site_info->tile;
wire.wire = canonical_wire(&ctx->site_info->chip_info(), ctx->site_info->tile, pip_data.dst_index);
break;
}
case SiteWire::SITE_PORT_SOURCE: {
const auto &pip_data = tile_type_data.pip_data[wire.pip.index];
wire.pip.tile = ctx->site_info->tile;
wire.wire = canonical_wire(&ctx->site_info->chip_info(), ctx->site_info->tile, pip_data.src_index);
break;
}
default:
NPNR_ASSERT(false);
}
}
for (SitePip &pip : solution->solution_storage) {
pip.pip.tile = ctx->site_info->tile;
switch (pip.type) {
case SitePip::SITE_PIP:
// Done!
break;
case SitePip::SITE_PORT:
// Done!
break;
case SitePip::SOURCE_TO_SITE_PORT:
NPNR_ASSERT(pip.wire.type == SiteWire::OUT_OF_SITE_SOURCE);
pip.wire.net = net.net;
break;
case SitePip::SITE_PORT_TO_SINK:
NPNR_ASSERT(pip.wire.type == SiteWire::OUT_OF_SITE_SINK);
pip.wire.net = net.net;
break;
case SitePip::SITE_PORT_TO_SITE_PORT:
pip.other_pip.tile = ctx->site_info->tile;
break;
default:
NPNR_ASSERT(false);
}
}
solution->verify(ctx, net);
return true;
}
void SiteRoutingCache::add_solutions(const SiteArch *ctx, const SiteNetInfo &net, const SiteRoutingSolution &solution)
{
SiteRoutingKey key = SiteRoutingKey::make(ctx, net);
cache_[key] = solution;
}
NEXTPNR_NAMESPACE_END
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