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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_LUT_MAPPING_CACHE_H
#define SITE_LUT_MAPPING_CACHE_H
#include "idstring.h"
#include "nextpnr_namespaces.h"
NEXTPNR_NAMESPACE_BEGIN
// Key structure used in site LUT mapping cache
struct SiteLutMappingKey {
// Maximum number of LUT cells per site
static constexpr size_t MAX_LUT_CELLS = 8;
// Maximum number of LUT inputs per cell
static constexpr size_t MAX_LUT_INPUTS = 6;
// LUT Cell data
struct Cell {
IdString type; // Cell type
int32_t belIndex; // Bound BEL index
// Port to net assignments. These are local net ids generated during
// key creation. This is to abstract connections from actual design
// net names. the Id 0 means unconnected.
std::array<int32_t, MAX_LUT_INPUTS> conns;
bool operator == (const Cell& other) const {
return (type == other.type) &&
(belIndex == other.belIndex) &&
(conns == other.conns);
}
bool operator != (const Cell& other) const {
return (type != other.type) ||
(belIndex != other.belIndex) ||
(conns != other.conns);
}
};
int32_t tileType; // Tile type
int32_t siteType; // Site type in that tile type
size_t numCells; // LUT cell count
std::array<Cell, MAX_LUT_CELLS> cells; // LUT cell data
unsigned int hash_; // Precomputed hash
static SiteLutMappingKey create (const SiteInformation& siteInfo);
void computeHash () {
hash_ = mkhash(0, tileType);
hash_ = mkhash(hash_, siteType);
hash_ = mkhash(hash_, numCells);
for (size_t j=0; j<numCells; ++j) {
const auto& cell = cells[j];
hash_ = mkhash(hash_, cell.type.index);
hash_ = mkhash(hash_, cell.belIndex);
for (size_t i=0; i<MAX_LUT_INPUTS; ++i) {
hash_ = mkhash(hash_, cell.conns[i]);
}
}
}
bool compareCells (const SiteLutMappingKey &other) const {
if (numCells != other.numCells) {
return false;
}
for (size_t i=0; i<numCells; ++i) {
if (cells[i] != other.cells[i]) {
return false;
}
}
return true;
}
bool operator == (const SiteLutMappingKey &other) const {
return (hash_ == other.hash_) &&
(tileType == other.tileType) &&
(siteType == other.siteType) &&
compareCells(other);
}
bool operator != (const SiteLutMappingKey &other) const {
return (hash_ != other.hash_) ||
(tileType != other.tileType) ||
(siteType != other.siteType) ||
!compareCells(other);
}
unsigned int hash () const {
return hash_;
}
};
// Site LUT mapping result data
struct SiteLutMappingResult {
// LUT cell data
struct Cell {
int32_t belIndex; // BEL in tile index
LutCell lutCell; // LUT mapping data
dict<IdString, IdString> belPins; // Cell to BEL pin mapping
};
bool isValid; // Validity flag
std::vector<Cell> cells; // Cell data
pool<std::pair<IdString, IdString>> blockedWires;
// Applies the mapping result to the site
bool apply (const SiteInformation& siteInfo);
};
// Site LUT mapping cache object
class SiteLutMappingCache {
public:
void add (const SiteLutMappingKey& key, const SiteLutMappingResult& result);
bool get (const SiteLutMappingKey& key, SiteLutMappingResult* result);
void clear ();
void clearStats ();
float getMissRatio () const {
return (float)numMisses / (float)(numHits + numMisses);
}
private:
dict<SiteLutMappingKey, SiteLutMappingResult> cache_;
size_t numHits = 0;
size_t numMisses = 0;
};
NEXTPNR_NAMESPACE_END
#endif /* SITE_LUT_MAPPING_CACHE_H */
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