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Diffstat (limited to 'abc70930/src/sat/fraig/fraigUtil.c')
| -rw-r--r-- | abc70930/src/sat/fraig/fraigUtil.c | 1034 |
1 files changed, 0 insertions, 1034 deletions
diff --git a/abc70930/src/sat/fraig/fraigUtil.c b/abc70930/src/sat/fraig/fraigUtil.c deleted file mode 100644 index 342a7111..00000000 --- a/abc70930/src/sat/fraig/fraigUtil.c +++ /dev/null @@ -1,1034 +0,0 @@ -/**CFile**************************************************************** - - FileName [fraigUtil.c] - - PackageName [FRAIG: Functionally reduced AND-INV graphs.] - - Synopsis [Various utilities.] - - Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] - - Affiliation [UC Berkeley] - - Date [Ver. 2.0. Started - October 1, 2004] - - Revision [$Id: fraigUtil.c,v 1.15 2005/07/08 01:01:34 alanmi Exp $] - -***********************************************************************/ - -#include "fraigInt.h" -#include <limits.h> - -//////////////////////////////////////////////////////////////////////// -/// DECLARATIONS /// -//////////////////////////////////////////////////////////////////////// - -static int bit_count[256] = { - 0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, - 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, - 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, - 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, - 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, - 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, - 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, - 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8 -}; - -static void Fraig_Dfs_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode, Fraig_NodeVec_t * vNodes, int fEquiv ); -static int Fraig_CheckTfi_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode, Fraig_Node_t * pOld ); - -//////////////////////////////////////////////////////////////////////// -/// FUNCTION DEFINITIONS /// -//////////////////////////////////////////////////////////////////////// - -/**Function************************************************************* - - Synopsis [Computes the DFS ordering of the nodes.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Fraig_NodeVec_t * Fraig_Dfs( Fraig_Man_t * pMan, int fEquiv ) -{ - Fraig_NodeVec_t * vNodes; - int i; - pMan->nTravIds++; - vNodes = Fraig_NodeVecAlloc( 100 ); - for ( i = 0; i < pMan->vOutputs->nSize; i++ ) - Fraig_Dfs_rec( pMan, Fraig_Regular(pMan->vOutputs->pArray[i]), vNodes, fEquiv ); - return vNodes; -} - -/**Function************************************************************* - - Synopsis [Computes the DFS ordering of the nodes.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Fraig_NodeVec_t * Fraig_DfsOne( Fraig_Man_t * pMan, Fraig_Node_t * pNode, int fEquiv ) -{ - Fraig_NodeVec_t * vNodes; - pMan->nTravIds++; - vNodes = Fraig_NodeVecAlloc( 100 ); - Fraig_Dfs_rec( pMan, Fraig_Regular(pNode), vNodes, fEquiv ); - return vNodes; -} - -/**Function************************************************************* - - Synopsis [Computes the DFS ordering of the nodes.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Fraig_NodeVec_t * Fraig_DfsNodes( Fraig_Man_t * pMan, Fraig_Node_t ** ppNodes, int nNodes, int fEquiv ) -{ - Fraig_NodeVec_t * vNodes; - int i; - pMan->nTravIds++; - vNodes = Fraig_NodeVecAlloc( 100 ); - for ( i = 0; i < nNodes; i++ ) - Fraig_Dfs_rec( pMan, Fraig_Regular(ppNodes[i]), vNodes, fEquiv ); - return vNodes; -} - -/**Function************************************************************* - - Synopsis [Recursively computes the DFS ordering of the nodes.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Fraig_Dfs_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode, Fraig_NodeVec_t * vNodes, int fEquiv ) -{ - assert( !Fraig_IsComplement(pNode) ); - // skip the visited node - if ( pNode->TravId == pMan->nTravIds ) - return; - pNode->TravId = pMan->nTravIds; - // visit the transitive fanin - if ( Fraig_NodeIsAnd(pNode) ) - { - Fraig_Dfs_rec( pMan, Fraig_Regular(pNode->p1), vNodes, fEquiv ); - Fraig_Dfs_rec( pMan, Fraig_Regular(pNode->p2), vNodes, fEquiv ); - } - if ( fEquiv && pNode->pNextE ) - Fraig_Dfs_rec( pMan, pNode->pNextE, vNodes, fEquiv ); - // save the node - Fraig_NodeVecPush( vNodes, pNode ); -} - -/**Function************************************************************* - - Synopsis [Computes the DFS ordering of the nodes.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_CountNodes( Fraig_Man_t * pMan, int fEquiv ) -{ - Fraig_NodeVec_t * vNodes; - int RetValue; - vNodes = Fraig_Dfs( pMan, fEquiv ); - RetValue = vNodes->nSize; - Fraig_NodeVecFree( vNodes ); - return RetValue; -} - -/**Function************************************************************* - - Synopsis [Returns 1 if pOld is in the TFI of pNew.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_CheckTfi( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew ) -{ - assert( !Fraig_IsComplement(pOld) ); - assert( !Fraig_IsComplement(pNew) ); - pMan->nTravIds++; - return Fraig_CheckTfi_rec( pMan, pNew, pOld ); -} - -/**Function************************************************************* - - Synopsis [Returns 1 if pOld is in the TFI of pNew.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_CheckTfi_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode, Fraig_Node_t * pOld ) -{ - // check the trivial cases - if ( pNode == NULL ) - return 0; - if ( pNode->Num < pOld->Num && !pMan->fChoicing ) - return 0; - if ( pNode == pOld ) - return 1; - // skip the visited node - if ( pNode->TravId == pMan->nTravIds ) - return 0; - pNode->TravId = pMan->nTravIds; - // check the children - if ( Fraig_CheckTfi_rec( pMan, Fraig_Regular(pNode->p1), pOld ) ) - return 1; - if ( Fraig_CheckTfi_rec( pMan, Fraig_Regular(pNode->p2), pOld ) ) - return 1; - // check equivalent nodes - return Fraig_CheckTfi_rec( pMan, pNode->pNextE, pOld ); -} - - -/**Function************************************************************* - - Synopsis [Returns 1 if pOld is in the TFI of pNew.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_CheckTfi2( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew ) -{ - Fraig_NodeVec_t * vNodes; - int RetValue; - vNodes = Fraig_DfsOne( pMan, pNew, 1 ); - RetValue = (pOld->TravId == pMan->nTravIds); - Fraig_NodeVecFree( vNodes ); - return RetValue; -} - -/**Function************************************************************* - - Synopsis [Sets the number of fanouts (none, one, or many).] - - Description [This procedure collects the nodes reachable from - the POs of the AIG and sets the type of fanout counter (none, one, - or many) for each node. This procedure is useful to determine - fanout-free cones of AND-nodes, which is helpful for rebalancing - the AIG (see procedure Fraig_ManRebalance, or something like that).] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Fraig_ManMarkRealFanouts( Fraig_Man_t * p ) -{ - Fraig_NodeVec_t * vNodes; - Fraig_Node_t * pNodeR; - int i; - // collect the nodes reachable - vNodes = Fraig_Dfs( p, 0 ); - // clean the fanouts field - for ( i = 0; i < vNodes->nSize; i++ ) - { - vNodes->pArray[i]->nFanouts = 0; - vNodes->pArray[i]->pData0 = NULL; - } - // mark reachable nodes by setting the two-bit counter pNode->nFans - for ( i = 0; i < vNodes->nSize; i++ ) - { - pNodeR = Fraig_Regular(vNodes->pArray[i]->p1); - if ( pNodeR && ++pNodeR->nFanouts == 3 ) - pNodeR->nFanouts = 2; - pNodeR = Fraig_Regular(vNodes->pArray[i]->p2); - if ( pNodeR && ++pNodeR->nFanouts == 3 ) - pNodeR->nFanouts = 2; - } - Fraig_NodeVecFree( vNodes ); -} - -/**Function************************************************************* - - Synopsis [Creates the constant 1 node.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_BitStringCountOnes( unsigned * pString, int nWords ) -{ - unsigned char * pSuppBytes = (unsigned char *)pString; - int i, nOnes, nBytes = sizeof(unsigned) * nWords; - // count the number of ones in the simulation vector - for ( i = nOnes = 0; i < nBytes; i++ ) - nOnes += bit_count[pSuppBytes[i]]; - return nOnes; -} - -/**Function************************************************************* - - Synopsis [Verify one useful property.] - - Description [This procedure verifies one useful property. After - the FRAIG construction with choice nodes is over, each primary node - should have fanins that are primary nodes. The primary nodes is the - one that does not have pNode->pRepr set to point to another node.] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_ManCheckConsistency( Fraig_Man_t * p ) -{ - Fraig_Node_t * pNode; - Fraig_NodeVec_t * pVec; - int i; - pVec = Fraig_Dfs( p, 0 ); - for ( i = 0; i < pVec->nSize; i++ ) - { - pNode = pVec->pArray[i]; - if ( Fraig_NodeIsVar(pNode) ) - { - if ( pNode->pRepr ) - printf( "Primary input %d is a secondary node.\n", pNode->Num ); - } - else if ( Fraig_NodeIsConst(pNode) ) - { - if ( pNode->pRepr ) - printf( "Constant 1 %d is a secondary node.\n", pNode->Num ); - } - else - { - if ( pNode->pRepr ) - printf( "Internal node %d is a secondary node.\n", pNode->Num ); - if ( Fraig_Regular(pNode->p1)->pRepr ) - printf( "Internal node %d has first fanin %d that is a secondary node.\n", - pNode->Num, Fraig_Regular(pNode->p1)->Num ); - if ( Fraig_Regular(pNode->p2)->pRepr ) - printf( "Internal node %d has second fanin %d that is a secondary node.\n", - pNode->Num, Fraig_Regular(pNode->p2)->Num ); - } - } - Fraig_NodeVecFree( pVec ); - return 1; -} - -/**Function************************************************************* - - Synopsis [Prints the node.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Fraig_PrintNode( Fraig_Man_t * p, Fraig_Node_t * pNode ) -{ - Fraig_NodeVec_t * vNodes; - Fraig_Node_t * pTemp; - int fCompl1, fCompl2, i; - - vNodes = Fraig_DfsOne( p, pNode, 0 ); - for ( i = 0; i < vNodes->nSize; i++ ) - { - pTemp = vNodes->pArray[i]; - if ( Fraig_NodeIsVar(pTemp) ) - { - printf( "%3d : PI ", pTemp->Num ); - Fraig_PrintBinary( stdout, (unsigned *)&pTemp->puSimR, 20 ); - printf( " " ); - Fraig_PrintBinary( stdout, (unsigned *)&pTemp->puSimD, 20 ); - printf( " %d\n", pTemp->fInv ); - continue; - } - - fCompl1 = Fraig_IsComplement(pTemp->p1); - fCompl2 = Fraig_IsComplement(pTemp->p2); - printf( "%3d : %c%3d %c%3d ", pTemp->Num, - (fCompl1? '-':'+'), Fraig_Regular(pTemp->p1)->Num, - (fCompl2? '-':'+'), Fraig_Regular(pTemp->p2)->Num ); - Fraig_PrintBinary( stdout, (unsigned *)&pTemp->puSimR, 20 ); - printf( " " ); - Fraig_PrintBinary( stdout, (unsigned *)&pTemp->puSimD, 20 ); - printf( " %d\n", pTemp->fInv ); - } - Fraig_NodeVecFree( vNodes ); -} - -/**Function************************************************************* - - Synopsis [Prints the bit string.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Fraig_PrintBinary( FILE * pFile, unsigned * pSign, int nBits ) -{ - int Remainder, nWords; - int w, i; - - Remainder = (nBits%(sizeof(unsigned)*8)); - nWords = (nBits/(sizeof(unsigned)*8)) + (Remainder>0); - - for ( w = nWords-1; w >= 0; w-- ) - for ( i = ((w == nWords-1 && Remainder)? Remainder-1: 31); i >= 0; i-- ) - fprintf( pFile, "%c", '0' + (int)((pSign[w] & (1<<i)) > 0) ); - -// fprintf( pFile, "\n" ); -} - -/**Function************************************************************* - - Synopsis [Sets up the mask.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_GetMaxLevel( Fraig_Man_t * pMan ) -{ - int nLevelMax, i; - nLevelMax = 0; - for ( i = 0; i < pMan->vOutputs->nSize; i++ ) - nLevelMax = nLevelMax > Fraig_Regular(pMan->vOutputs->pArray[i])->Level? - nLevelMax : Fraig_Regular(pMan->vOutputs->pArray[i])->Level; - return nLevelMax; -} - -/**Function************************************************************* - - Synopsis [Analyses choice nodes.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_MappingUpdateLevel_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode, int fMaximum ) -{ - Fraig_Node_t * pTemp; - int Level1, Level2, LevelE; - assert( !Fraig_IsComplement(pNode) ); - if ( !Fraig_NodeIsAnd(pNode) ) - return pNode->Level; - // skip the visited node - if ( pNode->TravId == pMan->nTravIds ) - return pNode->Level; - pNode->TravId = pMan->nTravIds; - // compute levels of the children nodes - Level1 = Fraig_MappingUpdateLevel_rec( pMan, Fraig_Regular(pNode->p1), fMaximum ); - Level2 = Fraig_MappingUpdateLevel_rec( pMan, Fraig_Regular(pNode->p2), fMaximum ); - pNode->Level = 1 + FRAIG_MAX( Level1, Level2 ); - if ( pNode->pNextE ) - { - LevelE = Fraig_MappingUpdateLevel_rec( pMan, pNode->pNextE, fMaximum ); - if ( fMaximum ) - { - if ( pNode->Level < LevelE ) - pNode->Level = LevelE; - } - else - { - if ( pNode->Level > LevelE ) - pNode->Level = LevelE; - } - // set the level of all equivalent nodes to be the same minimum - if ( pNode->pRepr == NULL ) // the primary node - for ( pTemp = pNode->pNextE; pTemp; pTemp = pTemp->pNextE ) - pTemp->Level = pNode->Level; - } - return pNode->Level; -} - -/**Function************************************************************* - - Synopsis [Resets the levels of the nodes in the choice graph.] - - Description [Makes the level of the choice nodes to be equal to the - maximum of the level of the nodes in the equivalence class. This way - sorting by level leads to the reverse topological order, which is - needed for the required time computation.] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Fraig_MappingSetChoiceLevels( Fraig_Man_t * pMan, int fMaximum ) -{ - int i; - pMan->nTravIds++; - for ( i = 0; i < pMan->vOutputs->nSize; i++ ) - Fraig_MappingUpdateLevel_rec( pMan, Fraig_Regular(pMan->vOutputs->pArray[i]), fMaximum ); -} - -/**Function************************************************************* - - Synopsis [Reports statistics on choice nodes.] - - Description [The number of choice nodes is the number of primary nodes, - which has pNextE set to a pointer. The number of choices is the number - of entries in the equivalent-node lists of the primary nodes.] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Fraig_ManReportChoices( Fraig_Man_t * pMan ) -{ - Fraig_Node_t * pNode, * pTemp; - int nChoiceNodes, nChoices; - int i, LevelMax1, LevelMax2; - - // report the number of levels - LevelMax1 = Fraig_GetMaxLevel( pMan ); - Fraig_MappingSetChoiceLevels( pMan, 0 ); - LevelMax2 = Fraig_GetMaxLevel( pMan ); - - // report statistics about choices - nChoiceNodes = nChoices = 0; - for ( i = 0; i < pMan->vNodes->nSize; i++ ) - { - pNode = pMan->vNodes->pArray[i]; - if ( pNode->pRepr == NULL && pNode->pNextE != NULL ) - { // this is a choice node = the primary node that has equivalent nodes - nChoiceNodes++; - for ( pTemp = pNode; pTemp; pTemp = pTemp->pNextE ) - nChoices++; - } - } - printf( "Maximum level: Original = %d. Reduced due to choices = %d.\n", LevelMax1, LevelMax2 ); - printf( "Choice stats: Choice nodes = %d. Total choices = %d.\n", nChoiceNodes, nChoices ); -} - -/**Function************************************************************* - - Synopsis [Returns 1 if the node is the root of EXOR/NEXOR gate.] - - Description [The node can be complemented.] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_NodeIsExorType( Fraig_Node_t * pNode ) -{ - Fraig_Node_t * pNode1, * pNode2; - // make the node regular (it does not matter for EXOR/NEXOR) - pNode = Fraig_Regular(pNode); - // if the node or its children are not ANDs or not compl, this cannot be EXOR type - if ( !Fraig_NodeIsAnd(pNode) ) - return 0; - if ( !Fraig_NodeIsAnd(pNode->p1) || !Fraig_IsComplement(pNode->p1) ) - return 0; - if ( !Fraig_NodeIsAnd(pNode->p2) || !Fraig_IsComplement(pNode->p2) ) - return 0; - - // get children - pNode1 = Fraig_Regular(pNode->p1); - pNode2 = Fraig_Regular(pNode->p2); - assert( pNode1->Num < pNode2->Num ); - - // compare grandchildren - return pNode1->p1 == Fraig_Not(pNode2->p1) && pNode1->p2 == Fraig_Not(pNode2->p2); -} - -/**Function************************************************************* - - Synopsis [Returns 1 if the node is the root of MUX or EXOR/NEXOR.] - - Description [The node can be complemented.] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_NodeIsMuxType( Fraig_Node_t * pNode ) -{ - Fraig_Node_t * pNode1, * pNode2; - - // make the node regular (it does not matter for EXOR/NEXOR) - pNode = Fraig_Regular(pNode); - // if the node or its children are not ANDs or not compl, this cannot be EXOR type - if ( !Fraig_NodeIsAnd(pNode) ) - return 0; - if ( !Fraig_NodeIsAnd(pNode->p1) || !Fraig_IsComplement(pNode->p1) ) - return 0; - if ( !Fraig_NodeIsAnd(pNode->p2) || !Fraig_IsComplement(pNode->p2) ) - return 0; - - // get children - pNode1 = Fraig_Regular(pNode->p1); - pNode2 = Fraig_Regular(pNode->p2); - assert( pNode1->Num < pNode2->Num ); - - // compare grandchildren - // node is an EXOR/NEXOR - if ( pNode1->p1 == Fraig_Not(pNode2->p1) && pNode1->p2 == Fraig_Not(pNode2->p2) ) - return 1; - - // otherwise the node is MUX iff it has a pair of equal grandchildren - return pNode1->p1 == Fraig_Not(pNode2->p1) || - pNode1->p1 == Fraig_Not(pNode2->p2) || - pNode1->p2 == Fraig_Not(pNode2->p1) || - pNode1->p2 == Fraig_Not(pNode2->p2); -} - -/**Function************************************************************* - - Synopsis [Returns 1 if the node is EXOR, 0 if it is NEXOR.] - - Description [The node should be EXOR type and not complemented.] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_NodeIsExor( Fraig_Node_t * pNode ) -{ - Fraig_Node_t * pNode1; - assert( !Fraig_IsComplement(pNode) ); - assert( Fraig_NodeIsExorType(pNode) ); - assert( Fraig_IsComplement(pNode->p1) ); - // get children - pNode1 = Fraig_Regular(pNode->p1); - return Fraig_IsComplement(pNode1->p1) == Fraig_IsComplement(pNode1->p2); -} - -/**Function************************************************************* - - Synopsis [Recognizes what nodes are control and data inputs of a MUX.] - - Description [If the node is a MUX, returns the control variable C. - Assigns nodes T and E to be the then and else variables of the MUX. - Node C is never complemented. Nodes T and E can be complemented. - This function also recognizes EXOR/NEXOR gates as MUXes.] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Fraig_Node_t * Fraig_NodeRecognizeMux( Fraig_Node_t * pNode, Fraig_Node_t ** ppNodeT, Fraig_Node_t ** ppNodeE ) -{ - Fraig_Node_t * pNode1, * pNode2; - assert( !Fraig_IsComplement(pNode) ); - assert( Fraig_NodeIsMuxType(pNode) ); - // get children - pNode1 = Fraig_Regular(pNode->p1); - pNode2 = Fraig_Regular(pNode->p2); - // find the control variable - if ( pNode1->p1 == Fraig_Not(pNode2->p1) ) - { - if ( Fraig_IsComplement(pNode1->p1) ) - { // pNode2->p1 is positive phase of C - *ppNodeT = Fraig_Not(pNode2->p2); - *ppNodeE = Fraig_Not(pNode1->p2); - return pNode2->p1; - } - else - { // pNode1->p1 is positive phase of C - *ppNodeT = Fraig_Not(pNode1->p2); - *ppNodeE = Fraig_Not(pNode2->p2); - return pNode1->p1; - } - } - else if ( pNode1->p1 == Fraig_Not(pNode2->p2) ) - { - if ( Fraig_IsComplement(pNode1->p1) ) - { // pNode2->p2 is positive phase of C - *ppNodeT = Fraig_Not(pNode2->p1); - *ppNodeE = Fraig_Not(pNode1->p2); - return pNode2->p2; - } - else - { // pNode1->p1 is positive phase of C - *ppNodeT = Fraig_Not(pNode1->p2); - *ppNodeE = Fraig_Not(pNode2->p1); - return pNode1->p1; - } - } - else if ( pNode1->p2 == Fraig_Not(pNode2->p1) ) - { - if ( Fraig_IsComplement(pNode1->p2) ) - { // pNode2->p1 is positive phase of C - *ppNodeT = Fraig_Not(pNode2->p2); - *ppNodeE = Fraig_Not(pNode1->p1); - return pNode2->p1; - } - else - { // pNode1->p2 is positive phase of C - *ppNodeT = Fraig_Not(pNode1->p1); - *ppNodeE = Fraig_Not(pNode2->p2); - return pNode1->p2; - } - } - else if ( pNode1->p2 == Fraig_Not(pNode2->p2) ) - { - if ( Fraig_IsComplement(pNode1->p2) ) - { // pNode2->p2 is positive phase of C - *ppNodeT = Fraig_Not(pNode2->p1); - *ppNodeE = Fraig_Not(pNode1->p1); - return pNode2->p2; - } - else - { // pNode1->p2 is positive phase of C - *ppNodeT = Fraig_Not(pNode1->p1); - *ppNodeE = Fraig_Not(pNode2->p1); - return pNode1->p2; - } - } - assert( 0 ); // this is not MUX - return NULL; -} - -/**Function************************************************************* - - Synopsis [Counts the number of EXOR type nodes.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_ManCountExors( Fraig_Man_t * pMan ) -{ - int i, nExors; - nExors = 0; - for ( i = 0; i < pMan->vNodes->nSize; i++ ) - nExors += Fraig_NodeIsExorType( pMan->vNodes->pArray[i] ); - return nExors; - -} - -/**Function************************************************************* - - Synopsis [Counts the number of EXOR type nodes.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_ManCountMuxes( Fraig_Man_t * pMan ) -{ - int i, nMuxes; - nMuxes = 0; - for ( i = 0; i < pMan->vNodes->nSize; i++ ) - nMuxes += Fraig_NodeIsMuxType( pMan->vNodes->pArray[i] ); - return nMuxes; - -} - -/**Function************************************************************* - - Synopsis [Returns 1 if siminfo of Node1 is contained in siminfo of Node2.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_NodeSimsContained( Fraig_Man_t * pMan, Fraig_Node_t * pNode1, Fraig_Node_t * pNode2 ) -{ - unsigned * pUnsigned1, * pUnsigned2; - int i; - - // compare random siminfo - pUnsigned1 = pNode1->puSimR; - pUnsigned2 = pNode2->puSimR; - for ( i = 0; i < pMan->nWordsRand; i++ ) - if ( pUnsigned1[i] & ~pUnsigned2[i] ) - return 0; - - // compare systematic siminfo - pUnsigned1 = pNode1->puSimD; - pUnsigned2 = pNode2->puSimD; - for ( i = 0; i < pMan->iWordStart; i++ ) - if ( pUnsigned1[i] & ~pUnsigned2[i] ) - return 0; - - return 1; -} - -/**Function************************************************************* - - Synopsis [Count the number of PI variables.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_CountPis( Fraig_Man_t * p, Msat_IntVec_t * vVarNums ) -{ - int * pVars, nVars, i, Counter; - - nVars = Msat_IntVecReadSize(vVarNums); - pVars = Msat_IntVecReadArray(vVarNums); - Counter = 0; - for ( i = 0; i < nVars; i++ ) - Counter += Fraig_NodeIsVar( p->vNodes->pArray[pVars[i]] ); - return Counter; -} - - - -/**Function************************************************************* - - Synopsis [Counts the number of EXOR type nodes.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_ManPrintRefs( Fraig_Man_t * pMan ) -{ - Fraig_NodeVec_t * vPivots; - Fraig_Node_t * pNode, * pNode2; - int i, k, Counter, nProved; - int clk; - - vPivots = Fraig_NodeVecAlloc( 1000 ); - for ( i = 0; i < pMan->vNodes->nSize; i++ ) - { - pNode = pMan->vNodes->pArray[i]; - - if ( pNode->nOnes == 0 || pNode->nOnes == (unsigned)pMan->nWordsRand * 32 ) - continue; - - if ( pNode->nRefs > 5 ) - { - Fraig_NodeVecPush( vPivots, pNode ); -// printf( "Node %6d : nRefs = %2d Level = %3d.\n", pNode->Num, pNode->nRefs, pNode->Level ); - } - } - printf( "Total nodes = %d. Referenced nodes = %d.\n", pMan->vNodes->nSize, vPivots->nSize ); - -clk = clock(); - // count implications - Counter = nProved = 0; - for ( i = 0; i < vPivots->nSize; i++ ) - for ( k = i+1; k < vPivots->nSize; k++ ) - { - pNode = vPivots->pArray[i]; - pNode2 = vPivots->pArray[k]; - if ( Fraig_NodeSimsContained( pMan, pNode, pNode2 ) ) - { - if ( Fraig_NodeIsImplication( pMan, pNode, pNode2, -1 ) ) - nProved++; - Counter++; - } - else if ( Fraig_NodeSimsContained( pMan, pNode2, pNode ) ) - { - if ( Fraig_NodeIsImplication( pMan, pNode2, pNode, -1 ) ) - nProved++; - Counter++; - } - } - printf( "Number of candidate pairs = %d. Proved = %d.\n", Counter, nProved ); -PRT( "Time", clock() - clk ); - return 0; -} - - -/**Function************************************************************* - - Synopsis [Checks if pNew exists among the implication fanins of pOld.] - - Description [If pNew is an implication fanin of pOld, returns 1. - If Fraig_Not(pNew) is an implication fanin of pOld, return -1. - Otherwise returns 0.] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_NodeIsInSupergate( Fraig_Node_t * pOld, Fraig_Node_t * pNew ) -{ - int RetValue1, RetValue2; - if ( Fraig_Regular(pOld) == Fraig_Regular(pNew) ) - return (pOld == pNew)? 1 : -1; - if ( Fraig_IsComplement(pOld) || Fraig_NodeIsVar(pOld) ) - return 0; - RetValue1 = Fraig_NodeIsInSupergate( pOld->p1, pNew ); - RetValue2 = Fraig_NodeIsInSupergate( pOld->p2, pNew ); - if ( RetValue1 == -1 || RetValue2 == -1 ) - return -1; - if ( RetValue1 == 1 || RetValue2 == 1 ) - return 1; - return 0; -} - - -/**Function************************************************************* - - Synopsis [Returns the array of nodes to be combined into one multi-input AND-gate.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Fraig_CollectSupergate_rec( Fraig_Node_t * pNode, Fraig_NodeVec_t * vSuper, int fFirst, int fStopAtMux ) -{ - // if the new node is complemented or a PI, another gate begins -// if ( Fraig_IsComplement(pNode) || Fraig_NodeIsVar(pNode) || Fraig_NodeIsMuxType(pNode) ) - if ( (!fFirst && Fraig_Regular(pNode)->nRefs > 1) || - Fraig_IsComplement(pNode) || Fraig_NodeIsVar(pNode) || - (fStopAtMux && Fraig_NodeIsMuxType(pNode)) ) - { - Fraig_NodeVecPushUnique( vSuper, pNode ); - return; - } - // go through the branches - Fraig_CollectSupergate_rec( pNode->p1, vSuper, 0, fStopAtMux ); - Fraig_CollectSupergate_rec( pNode->p2, vSuper, 0, fStopAtMux ); -} - -/**Function************************************************************* - - Synopsis [Returns the array of nodes to be combined into one multi-input AND-gate.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Fraig_NodeVec_t * Fraig_CollectSupergate( Fraig_Node_t * pNode, int fStopAtMux ) -{ - Fraig_NodeVec_t * vSuper; - vSuper = Fraig_NodeVecAlloc( 8 ); - Fraig_CollectSupergate_rec( pNode, vSuper, 1, fStopAtMux ); - return vSuper; -} - - -/**Function************************************************************* - - Synopsis [] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Fraig_ManIncrementTravId( Fraig_Man_t * pMan ) -{ - pMan->nTravIds2++; -} - -/**Function************************************************************* - - Synopsis [] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Fraig_NodeSetTravIdCurrent( Fraig_Man_t * pMan, Fraig_Node_t * pNode ) -{ - pNode->TravId2 = pMan->nTravIds2; -} - -/**Function************************************************************* - - Synopsis [] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_NodeIsTravIdCurrent( Fraig_Man_t * pMan, Fraig_Node_t * pNode ) -{ - return pNode->TravId2 == pMan->nTravIds2; -} - -/**Function************************************************************* - - Synopsis [] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Fraig_NodeIsTravIdPrevious( Fraig_Man_t * pMan, Fraig_Node_t * pNode ) -{ - return pNode->TravId2 == pMan->nTravIds2 - 1; -} - -//////////////////////////////////////////////////////////////////////// -/// END OF FILE /// -//////////////////////////////////////////////////////////////////////// - - |