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| author | Alan Mishchenko <alanmi@berkeley.edu> | 2005-12-22 08:01:00 -0800 |
|---|---|---|
| committer | Alan Mishchenko <alanmi@berkeley.edu> | 2005-12-22 08:01:00 -0800 |
| commit | 457e243e588e7ed5f39251784335e254a0c9e711 (patch) | |
| tree | 751d7b416e66e416983760d0b95d79bb24371309 /src/base/abci/abcStrash.c | |
| parent | 37f19d8dfb17605abab38110beec5fc17413e635 (diff) | |
| download | abc-457e243e588e7ed5f39251784335e254a0c9e711.tar.gz abc-457e243e588e7ed5f39251784335e254a0c9e711.tar.bz2 abc-457e243e588e7ed5f39251784335e254a0c9e711.zip | |
Version abc51222
Diffstat (limited to 'src/base/abci/abcStrash.c')
| -rw-r--r-- | src/base/abci/abcStrash.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/base/abci/abcStrash.c b/src/base/abci/abcStrash.c index d1734d88..72f4215b 100644 --- a/src/base/abci/abcStrash.c +++ b/src/base/abci/abcStrash.c @@ -29,6 +29,7 @@ // static functions static void Abc_NtkStrashPerform( Abc_Ntk_t * pNtk, Abc_Ntk_t * pNtkAig, bool fAllNodes ); static Abc_Obj_t * Abc_NodeStrashSop( Abc_Ntk_t * pNtkNew, Abc_Obj_t * pNode, char * pSop ); +static Abc_Obj_t * Abc_NodeStrashExor( Abc_Ntk_t * pNtkNew, Abc_Obj_t * pNode, char * pSop ); static Abc_Obj_t * Abc_NodeStrashFactor( Abc_Ntk_t * pNtkNew, Abc_Obj_t * pNode, char * pSop ); extern char * Mio_GateReadSop( void * pGate ); @@ -182,6 +183,7 @@ Abc_Obj_t * Abc_NodeStrash( Abc_Ntk_t * pNtkNew, Abc_Obj_t * pNode ) { int fUseFactor = 1; char * pSop; + extern int Abc_SopIsExorType( char * pSop ); assert( Abc_ObjIsNode(pNode) ); @@ -203,6 +205,10 @@ Abc_Obj_t * Abc_NodeStrash( Abc_Ntk_t * pNtkNew, Abc_Obj_t * pNode ) if ( Abc_NodeIsConst(pNode) ) return Abc_ObjNotCond( Abc_NtkConst1(pNtkNew), Abc_SopIsConst0(pSop) ); + // consider the special case of EXOR function + if ( Abc_SopIsExorType(pSop) ) + return Abc_NodeStrashExor( pNtkNew, pNode, pSop ); + // decide when to use factoring if ( fUseFactor && Abc_ObjFaninNum(pNode) > 2 && Abc_SopGetCubeNum(pSop) > 1 ) return Abc_NodeStrashFactor( pNtkNew, pNode, pSop ); @@ -254,6 +260,37 @@ Abc_Obj_t * Abc_NodeStrashSop( Abc_Ntk_t * pNtkNew, Abc_Obj_t * pNode, char * pS /**Function************************************************************* + Synopsis [Strashed n-input XOR function.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Abc_Obj_t * Abc_NodeStrashExor( Abc_Ntk_t * pNtkNew, Abc_Obj_t * pNode, char * pSop ) +{ + Abc_Aig_t * pMan = pNtkNew->pManFunc; + Abc_Obj_t * pFanin, * pSum; + int i, nFanins; + // get the number of node's fanins + nFanins = Abc_ObjFaninNum( pNode ); + assert( nFanins == Abc_SopGetVarNum(pSop) ); + // go through the cubes of the node's SOP + pSum = Abc_ObjNot( Abc_NtkConst1(pNtkNew) ); + for ( i = 0; i < nFanins; i++ ) + { + pFanin = Abc_ObjFanin( pNode, i ); + pSum = Abc_AigXor( pMan, pSum, pFanin->pCopy ); + } + if ( Abc_SopIsComplement(pSop) ) + pSum = Abc_ObjNot(pSum); + return pSum; +} + +/**Function************************************************************* + Synopsis [Strashes one logic node using its SOP.] Description [] |