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abc/src/opt/fxch/FxchSCHashTable.c

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/**CFile****************************************************************
FileName [ FxchSCHashTable.c ]
PackageName [ Fast eXtract with Cube Hashing (FXCH) ]
Synopsis [ Sub-cubes hash table implementation ]
Author [ Bruno Schmitt - boschmitt at inf.ufrgs.br ]
Affiliation [ UFRGS ]
Date [ Ver. 1.0. Started - March 6, 2016. ]
Revision []
***********************************************************************/
#include "Fxch.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
static inline void MurmurHash3_x86_32 ( const void* key,
int len,
uint32_t seed,
void* out )
{
const uint8_t* data = (const uint8_t*)key;
const int nblocks = len / 4;
uint32_t h1 = seed;
const uint32_t c1 = 0xcc9e2d51;
const uint32_t c2 = 0x1b873593;
//----------
// body
const uint32_t * blocks = (const uint32_t *)(data + nblocks*4);
for(int i = -nblocks; i; i++)
{
uint32_t k1 = blocks[i];
k1 *= c1;
k1 = (k1 << 15) | (k1 >> (32 - 15));
k1 *= c2;
h1 ^= k1;
h1 = (h1 << 13) | (h1 >> (32 - 13));
h1 = h1*5+0xe6546b64;
}
//----------
// tail
const uint8_t * tail = (const uint8_t*)(data + nblocks*4);
uint32_t k1 = 0;
switch(len & 3)
{
case 3: k1 ^= tail[2] << 16;
case 2: k1 ^= tail[1] << 8;
case 1: k1 ^= tail[0];
k1 *= c1; k1 = (k1 << 15) | (k1 >> (32 - 15)); k1 *= c2; h1 ^= k1;
};
//----------
// finalization
h1 ^= len;
h1 ^= h1 >> 16;
h1 *= 0x85ebca6b;
h1 ^= h1 >> 13;
h1 *= 0xc2b2ae35;
h1 ^= h1 >> 16;
*(uint32_t*)out = h1;
}
Fxch_SCHashTable_t* Fxch_SCHashTableCreate( Fxch_Man_t* pFxchMan,
Vec_Int_t* vCubeLinks,
int nEntries )
{
Fxch_SCHashTable_t* pSCHashTable = ABC_CALLOC( Fxch_SCHashTable_t, 1 );
int nBits = Abc_Base2Log( nEntries + 1 ) + 1;
pSCHashTable->pFxchMan = pFxchMan;
pSCHashTable->SizeMask = (1 << nBits) - 1;
pSCHashTable->vCubeLinks = vCubeLinks;
pSCHashTable->pBins = ABC_CALLOC( Fxch_SCHashTable_Entry_t, pSCHashTable->SizeMask + 1 );
return pSCHashTable;
}
void Fxch_SCHashTableDelete( Fxch_SCHashTable_t* pSCHashTable )
{
Vec_IntFree( pSCHashTable->vCubeLinks );
Vec_IntErase( &pSCHashTable->vSubCube0 );
Vec_IntErase( &pSCHashTable->vSubCube1 );
ABC_FREE( pSCHashTable->pBins );
ABC_FREE( pSCHashTable );
}
static inline Fxch_SCHashTable_Entry_t* Fxch_SCHashTableBin( Fxch_SCHashTable_t* pSCHashTable,
unsigned int SubCubeID )
{
return pSCHashTable->pBins + (SubCubeID & pSCHashTable->SizeMask);
}
static inline Fxch_SCHashTable_Entry_t* Fxch_SCHashTableEntry( Fxch_SCHashTable_t* pSCHashTable,
unsigned int iEntry )
{
if ( ( iEntry > 0 ) && ( iEntry < ( pSCHashTable->SizeMask + 1 ) ) )
return pSCHashTable->pBins + iEntry;
return NULL;
}
static inline void Fxch_SCHashTableInsertLink( Fxch_SCHashTable_t* pSCHashTable,
unsigned int iEntry0,
unsigned int iEntry1 )
{
Fxch_SCHashTable_Entry_t* pEntry0 = Fxch_SCHashTableEntry( pSCHashTable, iEntry0 ),
* pEntry1 = Fxch_SCHashTableEntry( pSCHashTable, iEntry1 ),
* pEntry0Next = Fxch_SCHashTableEntry( pSCHashTable, pEntry0->iNext );
assert( pEntry0Next->iPrev == iEntry0 );
pEntry1->iNext = pEntry0->iNext;
pEntry0->iNext = iEntry1;
pEntry1->iPrev = iEntry0;
pEntry0Next->iPrev = iEntry1;
}
static inline void Fxch_SCHashTableRemoveLink( Fxch_SCHashTable_t* pSCHashTable,
int iEntry0,
int iEntry1 )
{
Fxch_SCHashTable_Entry_t* pEntry0 = Fxch_SCHashTableEntry( pSCHashTable, iEntry0 ),
* pEntry1 = Fxch_SCHashTableEntry( pSCHashTable, iEntry1 ),
* pEntry1Next = Fxch_SCHashTableEntry( pSCHashTable, pEntry1->iNext );
assert( pEntry0->iNext == iEntry1 );
assert( pEntry1->iPrev == iEntry0 );
assert( pEntry1Next->iPrev == iEntry1 );
pEntry0->iNext = pEntry1->iNext;
pEntry1->iNext = 0;
pEntry1Next->iPrev = pEntry1->iPrev;
pEntry1->iPrev = 0;
}
static inline int Fxch_SCHashTableEntryCompare( Fxch_SCHashTable_t* pSCHashTable,
Vec_Wec_t* vCubes,
Fxch_SubCube_t* pSCData0,
Fxch_SubCube_t* pSCData1 )
{
Vec_Int_t* vCube0 = Vec_WecEntry( vCubes, pSCData0->iCube ),
* vCube1 = Vec_WecEntry( vCubes, pSCData1->iCube );
if ( !Vec_IntSize( vCube0 ) ||
!Vec_IntSize( vCube1 ) ||
Vec_IntEntry( vCube0, 0 ) != Vec_IntEntry( vCube1, 0 ) ||
pSCData0->Id != pSCData1->Id )
return 0;
Vec_IntClear( &pSCHashTable->vSubCube0 );
Vec_IntClear( &pSCHashTable->vSubCube1 );
if ( pSCData0->iLit1 == 0 && pSCData1->iLit1 == 0 &&
Vec_IntEntry( vCube0, pSCData0->iLit0 ) == Abc_LitNot( Vec_IntEntry( vCube1, pSCData1->iLit0 ) ) )
return 0;
if ( pSCData0->iLit1 > 0 && pSCData1->iLit1 > 0 &&
( Vec_IntEntry( vCube0, pSCData0->iLit0 ) == Vec_IntEntry( vCube1, pSCData1->iLit0 ) ||
Vec_IntEntry( vCube0, pSCData0->iLit0 ) == Vec_IntEntry( vCube1, pSCData1->iLit1 ) ||
Vec_IntEntry( vCube0, pSCData0->iLit1 ) == Vec_IntEntry( vCube1, pSCData1->iLit0 ) ||
Vec_IntEntry( vCube0, pSCData0->iLit1 ) == Vec_IntEntry( vCube1, pSCData1->iLit1 ) ) )
return 0;
if ( pSCData0->iLit0 > 0 )
Vec_IntAppendSkip( &pSCHashTable->vSubCube0, vCube0, pSCData0->iLit0 );
else
Vec_IntAppend( &pSCHashTable->vSubCube0, vCube0 );
if ( pSCData1->iLit0 > 0 )
Vec_IntAppendSkip( &pSCHashTable->vSubCube1, vCube1, pSCData1->iLit0 );
else
Vec_IntAppend( &pSCHashTable->vSubCube1, vCube1 );
if ( pSCData0->iLit1 > 0)
Vec_IntDrop( &pSCHashTable->vSubCube0,
pSCData0->iLit0 < pSCData0->iLit1 ? pSCData0->iLit1 - 1 : pSCData0->iLit1 );
if ( pSCData1->iLit1 > 0 )
Vec_IntDrop( &pSCHashTable->vSubCube1,
pSCData1->iLit0 < pSCData1->iLit1 ? pSCData1->iLit1 - 1 : pSCData1->iLit1 );
Vec_IntDrop( &pSCHashTable->vSubCube0, 0 );
Vec_IntDrop( &pSCHashTable->vSubCube1, 0 );
return Vec_IntEqual( &pSCHashTable->vSubCube0, &pSCHashTable->vSubCube1 );
}
int Fxch_SCHashTableInsert( Fxch_SCHashTable_t* pSCHashTable,
Vec_Wec_t* vCubes,
unsigned int SubCubeID,
unsigned int iSubCube,
unsigned int iCube,
unsigned int iLit0,
unsigned int iLit1,
char fUpdate )
{
unsigned int BinID;
MurmurHash3_x86_32( ( void* ) &SubCubeID, sizeof( int ), 0x9747b28c, &BinID);
unsigned int iNewEntry = ( unsigned int )( Vec_IntEntry( pSCHashTable->vCubeLinks, iCube ) ) + iSubCube;
Fxch_SCHashTable_Entry_t* pBin = Fxch_SCHashTableBin( pSCHashTable, BinID ),
* pNewEntry = Fxch_SCHashTableEntry( pSCHashTable, iNewEntry );
assert( pNewEntry->Used == 0 );
pNewEntry->SCData.Id = SubCubeID;
pNewEntry->SCData.iCube = iCube;
pNewEntry->SCData.iLit0 = iLit0;
pNewEntry->SCData.iLit1 = iLit1;
pNewEntry->Used = 1;
pSCHashTable->nEntries++;
if ( pBin->iTable == 0 )
{
pBin->iTable = iNewEntry;
pNewEntry->iNext = iNewEntry;
pNewEntry->iPrev = iNewEntry;
return 0;
}
Fxch_SCHashTable_Entry_t* pEntry;
unsigned int iEntry;
char Pairs = 0,
fStart = 1;
for ( iEntry = pBin->iTable; iEntry != pBin->iTable || fStart; iEntry = pEntry->iNext, fStart = 0 )
{
pEntry = Fxch_SCHashTableBin( pSCHashTable, iEntry );
if ( !Fxch_SCHashTableEntryCompare( pSCHashTable, vCubes, &( pEntry->SCData ), &( pNewEntry->SCData ) ) )
continue;
if ( pEntry->SCData.iLit0 == 0 )
{
printf("[FXCH] SCC detected\n");
continue;
}
if ( pNewEntry->SCData.iLit0 == 0 )
{
printf("[FXCH] SCC detected\n");
continue;
}
int Base;
if ( pEntry->SCData.iCube < pNewEntry->SCData.iCube )
Base = Fxch_DivCreate( pSCHashTable->pFxchMan, &( pEntry->SCData ), &( pNewEntry->SCData ) );
else
Base = Fxch_DivCreate( pSCHashTable->pFxchMan, &( pNewEntry->SCData ), &( pEntry->SCData ) );
if ( Base < 0 )
continue;
int iNewDiv = Fxch_DivAdd( pSCHashTable->pFxchMan, fUpdate, 0, Base );
if ( pSCHashTable->pFxchMan->SMode == 0 )
{
Vec_WecPush( pSCHashTable->pFxchMan->vDivCubePairs, iNewDiv, pEntry->SCData.iCube );
Vec_WecPush( pSCHashTable->pFxchMan->vDivCubePairs, iNewDiv, pNewEntry->SCData.iCube );
}
Pairs++;
}
assert( iEntry == (unsigned int)( pBin->iTable ) );
pEntry = Fxch_SCHashTableBin( pSCHashTable, iEntry );
Fxch_SCHashTableInsertLink( pSCHashTable, pEntry->iPrev, iNewEntry );
return Pairs;
}
int Fxch_SCHashTableRemove( Fxch_SCHashTable_t* pSCHashTable,
Vec_Wec_t* vCubes,
unsigned int SubCubeID,
unsigned int iSubCube,
unsigned int iCube,
unsigned int iLit0,
unsigned int iLit1,
char fUpdate )
{
unsigned int BinID;
MurmurHash3_x86_32( ( void* ) &SubCubeID, sizeof( int ), 0x9747b28c, &BinID);
unsigned int iEntry = ( unsigned int )( Vec_IntEntry( pSCHashTable->vCubeLinks, iCube ) ) + iSubCube;
Fxch_SCHashTable_Entry_t* pBin = Fxch_SCHashTableBin( pSCHashTable, BinID ),
* pEntry = Fxch_SCHashTableEntry( pSCHashTable, iEntry );
assert( pEntry->Used == 1 );
assert( pEntry->SCData.iCube == iCube );
if ( pEntry->iNext == iEntry )
{
assert( pEntry->iPrev == iEntry );
pBin->iTable = 0;
pEntry->iNext = 0;
pEntry->iPrev = 0;
pEntry->Used = 0;
return 0;
}
Fxch_SCHashTable_Entry_t* pNextEntry;
int iNextEntry,
Pairs = 0,
fStart = 1;
for ( iNextEntry = pEntry->iNext; iNextEntry != iEntry; iNextEntry = pNextEntry->iNext, fStart = 0 )
{
pNextEntry = Fxch_SCHashTableBin( pSCHashTable, iNextEntry );
if ( !Fxch_SCHashTableEntryCompare( pSCHashTable, vCubes, &( pEntry->SCData ), &( pNextEntry->SCData ) )
|| pEntry->SCData.iLit0 == 0
|| pNextEntry->SCData.iLit0 == 0 )
continue;
int Base;
if ( pNextEntry->SCData.iCube < pEntry->SCData.iCube )
Base = Fxch_DivCreate( pSCHashTable->pFxchMan, &( pNextEntry->SCData ), &( pEntry->SCData ) );
else
Base = Fxch_DivCreate( pSCHashTable->pFxchMan, &( pEntry->SCData ), &( pNextEntry->SCData ) );
if ( Base < 0 )
continue;
int iDiv = Fxch_DivRemove( pSCHashTable->pFxchMan, fUpdate, 0, Base );
if ( pSCHashTable->pFxchMan->SMode == 0 )
{
int i,
iCube0,
iCube1;
Vec_Int_t* vDivCubePairs = Vec_WecEntry( pSCHashTable->pFxchMan->vDivCubePairs, iDiv );
Vec_IntForEachEntryDouble( vDivCubePairs, iCube0, iCube1, i )
if ( ( iCube0 == pNextEntry->SCData.iCube && iCube1 == pEntry->SCData.iCube ) ||
( iCube0 == pEntry->SCData.iCube && iCube1 == pNextEntry->SCData.iCube ) )
{
Vec_IntDrop( vDivCubePairs, i+1 );
Vec_IntDrop( vDivCubePairs, i );
}
if ( Vec_IntSize( vDivCubePairs ) == 0 )
Vec_IntErase( vDivCubePairs );
}
Pairs++;
}
if ( pBin->iTable == iEntry )
pBin->iTable = ( pEntry->iNext != iEntry ) ? pEntry->iNext : 0;
pEntry->Used = 0;
Fxch_SCHashTableRemoveLink( pSCHashTable, pEntry->iPrev, iEntry );
return Pairs;
}
unsigned int Fxch_SCHashTableMemory( Fxch_SCHashTable_t* pHashTable )
{
unsigned int Memory = sizeof ( Fxch_SCHashTable_t );
Memory += Vec_IntMemory( pHashTable->vCubeLinks );
Memory += sizeof( Fxch_SubCube_t ) * ( pHashTable->SizeMask + 1 );
return Memory;
}
void Fxch_SCHashTablePrint( Fxch_SCHashTable_t* pHashTable )
{
printf( "SubCube Hash Table at %p\n", ( void* )pHashTable );
printf("%20s %20s\n", "nEntries",
"Memory Usage (MB)" );
int Memory = Fxch_SCHashTableMemory( pHashTable );
printf("%20d %18.2f\n", pHashTable->nEntries,
( ( double ) Memory / 1048576 ) );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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