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Updating LUT cascade generation to support flexible inputs.

This commit is contained in:
Alan Mishchenko 2025-11-18 12:07:20 -08:00
parent 309282601e
commit d8219265fc
1 changed files with 34 additions and 9 deletions
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43
src/aig/gia/giaLutCas.c
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@ -160,13 +160,23 @@ char * Gia_LutCasPerm( int nVars, int nLuts, int LutSize )
Gia_LutCasSort( pRes + i * LutSize, 1, LutSize-1 );
return pRes;
}
int Gia_ManGenLutCas_rec( Gia_Man_t * pNew, Vec_Int_t * vCtrls, int iCtrl, Vec_Int_t * vDatas, int Shift )
int Gia_ManGenLutCas_rec( Gia_Man_t * pNew, Vec_Int_t * vCtrls, int iCtrl, Vec_Int_t * vDatas, int Shift, int Offset )
{
if ( iCtrl-- == 0 )
return Vec_IntEntry( vDatas, Shift );
int iLit0 = Gia_ManGenLutCas_rec( pNew, vCtrls, iCtrl, vDatas, Shift );
int iLit1 = Gia_ManGenLutCas_rec( pNew, vCtrls, iCtrl, vDatas, Shift + (1<<iCtrl));
return Gia_ManAppendMux( pNew, Vec_IntEntry(vCtrls, iCtrl), iLit1, iLit0 );
int iLit0 = Gia_ManGenLutCas_rec( pNew, vCtrls, iCtrl, vDatas, Shift, Offset );
int iLit1 = Gia_ManGenLutCas_rec( pNew, vCtrls, iCtrl, vDatas, Shift + (1<<iCtrl), Offset );
return Gia_ManAppendMux( pNew, Vec_IntEntry(vCtrls, iCtrl+Offset), iLit1, iLit0 );
}
int Gia_ManGenWire( Gia_Man_t * pNew, Vec_Int_t * vCtrls, Vec_Int_t * vParams2, int iParam2 )
{
int nVars = Vec_IntSize(vCtrls);
int nBits = Abc_Base2Log(nVars);
while ( Vec_IntSize(vCtrls) < (1 << nBits) )
Vec_IntPush( vCtrls, 0 );
int iRes = Gia_ManGenLutCas_rec( pNew, vParams2, nBits, vCtrls, 0, iParam2 );
Vec_IntShrink( vCtrls, nVars );
return iRes;
}
Gia_Man_t * Gia_ManGenLutCas( Gia_Man_t * p, char * pPermStr, int nVars, int nLuts, int LutSize, int Seed, int fVerbose )
{
@ -181,25 +191,39 @@ Gia_Man_t * Gia_ManGenLutCas( Gia_Man_t * p, char * pPermStr, int nVars, int nLu
int fOwnPerm = (pPermStr == NULL);
char * pPerm = fOwnPerm ? Gia_LutCasPerm( nVars, nLuts, LutSize ) : pPermStr;
int nParams = nLuts * (1 << LutSize);
// count how many variables are unassigned in the permutation
int nParams2 = 0;
for ( int v = 0; v < strlen(pPerm); v++ )
if ( pPerm[v] == '*' )
nParams2 += Abc_Base2Log(nVars);
if ( fVerbose )
printf( "Generating AIG with %d parameters and %d inputs using fanin assignment %s.\n", nParams, nVars, pPerm );
printf( "Generating AIG with %d parameters (%d functional + %d structural) and %d inputs using fanin assignment \"%s\".\n",
nParams+nParams2, nParams, nParams2, nVars, pPerm );
Gia_Man_t * pNew = Gia_ManStart( nParams + nVars );
pNew->pName = Abc_UtilStrsav( pPerm );
Vec_Int_t * vDatas = Vec_IntAlloc( nParams );
Vec_Int_t * vWires = Vec_IntAlloc( nParams2 );
Vec_Int_t * vCtrls = Vec_IntAlloc( nVars );
for ( int i = 0; i < nParams; i++ )
Vec_IntPush( vDatas, Gia_ManAppendCi(pNew) );
for ( int i = 0; i < nParams2; i++ )
Vec_IntPush( vWires, Gia_ManAppendCi(pNew) );
for ( int i = 0; i < nVars; i++ )
Vec_IntPush( vCtrls, Gia_ManAppendCi(pNew) );
Vec_Int_t * vLits = Vec_IntStart( LutSize );
Vec_IntWriteEntry( vLits, 0, Vec_IntEntry(vCtrls, (int)(pPerm[0]-'a')) );
Vec_IntWriteEntry( vLits, 0, pPerm[0] == '*' ? Gia_ManGenWire(pNew, vCtrls, vWires, 0) : Vec_IntEntry(vCtrls, (int)(pPerm[0]-'a')) );
int iWireVars = pPerm[0] == '*' ? Abc_Base2Log(nVars) : 0;
char * pCur = pPerm;
for ( int i = 0; i < nLuts; i++ ) {
assert( i == 0 || *pCur == '_' );
pCur++;
for ( int k = 1; k < LutSize; k++ )
Vec_IntWriteEntry( vLits, k, Vec_IntEntry(vCtrls, (int)(*pCur++ - 'a')) );
Vec_IntWriteEntry( vLits, 0, Gia_ManGenLutCas_rec(pNew, vLits, LutSize, vDatas, i * (1 << LutSize)) );
for ( int k = 1; k < LutSize; k++ ) {
Vec_IntWriteEntry( vLits, k, *pCur == '*' ? Gia_ManGenWire(pNew, vCtrls, vWires, iWireVars) : Vec_IntEntry(vCtrls, (int)(*pCur - 'a')) );
iWireVars += *pCur++ == '*' ? Abc_Base2Log(nVars) : 0;
}
Vec_IntWriteEntry( vLits, 0, Gia_ManGenLutCas_rec(pNew, vLits, LutSize, vDatas, i * (1 << LutSize), 0) );
}
assert( iWireVars == nParams2 );
// if the AIG is given, create a miter
int iLit = Vec_IntEntry(vLits, 0);
if ( p ) {
@ -218,6 +242,7 @@ Gia_Man_t * Gia_ManGenLutCas( Gia_Man_t * p, char * pPermStr, int nVars, int nLu
Gia_ManAppendCo( pNew, iLit );
Vec_IntFree( vDatas );
Vec_IntFree( vCtrls );
Vec_IntFree( vWires );
Vec_IntFree( vLits );
if ( fOwnPerm )
ABC_FREE( pPerm );