diff options
Diffstat (limited to 'src/aig/kit/kitFactor.c')
-rw-r--r-- | src/aig/kit/kitFactor.c | 339 |
1 files changed, 0 insertions, 339 deletions
diff --git a/src/aig/kit/kitFactor.c b/src/aig/kit/kitFactor.c deleted file mode 100644 index f596d9a8..00000000 --- a/src/aig/kit/kitFactor.c +++ /dev/null @@ -1,339 +0,0 @@ -/**CFile**************************************************************** - - FileName [kitFactor.c] - - SystemName [ABC: Logic synthesis and verification system.] - - PackageName [Computation kit.] - - Synopsis [Algebraic factoring.] - - Author [Alan Mishchenko] - - Affiliation [UC Berkeley] - - Date [Ver. 1.0. Started - Dec 6, 2006.] - - Revision [$Id: kitFactor.c,v 1.00 2006/12/06 00:00:00 alanmi Exp $] - -***********************************************************************/ - -#include "kit.h" - -//////////////////////////////////////////////////////////////////////// -/// DECLARATIONS /// -//////////////////////////////////////////////////////////////////////// - -// factoring fails if intermediate memory usage exceed this limit -#define KIT_FACTOR_MEM_LIMIT (1<<16) - -static Kit_Edge_t Kit_SopFactor_rec( Kit_Graph_t * pFForm, Kit_Sop_t * cSop, int nLits, Vec_Int_t * vMemory ); -static Kit_Edge_t Kit_SopFactorLF_rec( Kit_Graph_t * pFForm, Kit_Sop_t * cSop, Kit_Sop_t * cSimple, int nLits, Vec_Int_t * vMemory ); -static Kit_Edge_t Kit_SopFactorTrivial( Kit_Graph_t * pFForm, Kit_Sop_t * cSop, int nLits ); -static Kit_Edge_t Kit_SopFactorTrivialCube( Kit_Graph_t * pFForm, unsigned uCube, int nLits ); - -extern int Kit_SopFactorVerify( Vec_Int_t * cSop, Kit_Graph_t * pFForm, int nVars ); - -//////////////////////////////////////////////////////////////////////// -/// FUNCTION DEFINITIONS /// -//////////////////////////////////////////////////////////////////////// - -/**Function************************************************************* - - Synopsis [Factors the cover.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Kit_Graph_t * Kit_SopFactor( Vec_Int_t * vCover, int fCompl, int nVars, Vec_Int_t * vMemory ) -{ - Kit_Sop_t Sop, * cSop = &Sop; - Kit_Graph_t * pFForm; - Kit_Edge_t eRoot; -// int nCubes; - - // works for up to 15 variables because division procedure - // used the last bit for marking the cubes going to the remainder - assert( nVars < 16 ); - - // check for trivial functions - if ( Vec_IntSize(vCover) == 0 ) - return Kit_GraphCreateConst0(); - if ( Vec_IntSize(vCover) == 1 && Vec_IntEntry(vCover, 0) == 0 ) - return Kit_GraphCreateConst1(); - - // prepare memory manager -// Vec_IntClear( vMemory ); - Vec_IntGrow( vMemory, KIT_FACTOR_MEM_LIMIT ); - - // perform CST - Kit_SopCreateInverse( cSop, vCover, 2 * nVars, vMemory ); // CST - - // start the factored form - pFForm = Kit_GraphCreate( nVars ); - // factor the cover - eRoot = Kit_SopFactor_rec( pFForm, cSop, 2 * nVars, vMemory ); - // finalize the factored form - Kit_GraphSetRoot( pFForm, eRoot ); - if ( fCompl ) - Kit_GraphComplement( pFForm ); - - // verify the factored form -// nCubes = Vec_IntSize(vCover); -// Vec_IntShrink( vCover, nCubes ); -// if ( !Kit_SopFactorVerify( vCover, pFForm, nVars ) ) -// printf( "Verification has failed.\n" ); - return pFForm; -} - -/**Function************************************************************* - - Synopsis [Recursive factoring procedure.] - - Description [For the pseudo-code, see Hachtel/Somenzi, - Logic synthesis and verification algorithms, Kluwer, 1996, p. 432.] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Kit_Edge_t Kit_SopFactor_rec( Kit_Graph_t * pFForm, Kit_Sop_t * cSop, int nLits, Vec_Int_t * vMemory ) -{ - Kit_Sop_t Div, Quo, Rem, Com; - Kit_Sop_t * cDiv = &Div, * cQuo = &Quo, * cRem = &Rem, * cCom = &Com; - Kit_Edge_t eNodeDiv, eNodeQuo, eNodeRem, eNodeAnd; - - // make sure the cover contains some cubes - assert( Kit_SopCubeNum(cSop) > 0 ); - - // get the divisor - if ( !Kit_SopDivisor(cDiv, cSop, nLits, vMemory) ) - return Kit_SopFactorTrivial( pFForm, cSop, nLits ); - - // divide the cover by the divisor - Kit_SopDivideInternal( cSop, cDiv, cQuo, cRem, vMemory ); - - // check the trivial case - assert( Kit_SopCubeNum(cQuo) > 0 ); - if ( Kit_SopCubeNum(cQuo) == 1 ) - return Kit_SopFactorLF_rec( pFForm, cSop, cQuo, nLits, vMemory ); - - // make the quotient cube free - Kit_SopMakeCubeFree( cQuo ); - - // divide the cover by the quotient - Kit_SopDivideInternal( cSop, cQuo, cDiv, cRem, vMemory ); - - // check the trivial case - if ( Kit_SopIsCubeFree( cDiv ) ) - { - eNodeDiv = Kit_SopFactor_rec( pFForm, cDiv, nLits, vMemory ); - eNodeQuo = Kit_SopFactor_rec( pFForm, cQuo, nLits, vMemory ); - eNodeAnd = Kit_GraphAddNodeAnd( pFForm, eNodeDiv, eNodeQuo ); - if ( Kit_SopCubeNum(cRem) == 0 ) - return eNodeAnd; - eNodeRem = Kit_SopFactor_rec( pFForm, cRem, nLits, vMemory ); - return Kit_GraphAddNodeOr( pFForm, eNodeAnd, eNodeRem ); - } - - // get the common cube - Kit_SopCommonCubeCover( cCom, cDiv, vMemory ); - - // solve the simple problem - return Kit_SopFactorLF_rec( pFForm, cSop, cCom, nLits, vMemory ); -} - - -/**Function************************************************************* - - Synopsis [Internal recursive factoring procedure for the leaf case.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Kit_Edge_t Kit_SopFactorLF_rec( Kit_Graph_t * pFForm, Kit_Sop_t * cSop, Kit_Sop_t * cSimple, int nLits, Vec_Int_t * vMemory ) -{ - Kit_Sop_t Div, Quo, Rem; - Kit_Sop_t * cDiv = &Div, * cQuo = &Quo, * cRem = &Rem; - Kit_Edge_t eNodeDiv, eNodeQuo, eNodeRem, eNodeAnd; - assert( Kit_SopCubeNum(cSimple) == 1 ); - // get the most often occurring literal - Kit_SopBestLiteralCover( cDiv, cSop, Kit_SopCube(cSimple, 0), nLits, vMemory ); - // divide the cover by the literal - Kit_SopDivideByCube( cSop, cDiv, cQuo, cRem, vMemory ); - // get the node pointer for the literal - eNodeDiv = Kit_SopFactorTrivialCube( pFForm, Kit_SopCube(cDiv, 0), nLits ); - // factor the quotient and remainder - eNodeQuo = Kit_SopFactor_rec( pFForm, cQuo, nLits, vMemory ); - eNodeAnd = Kit_GraphAddNodeAnd( pFForm, eNodeDiv, eNodeQuo ); - if ( Kit_SopCubeNum(cRem) == 0 ) - return eNodeAnd; - eNodeRem = Kit_SopFactor_rec( pFForm, cRem, nLits, vMemory ); - return Kit_GraphAddNodeOr( pFForm, eNodeAnd, eNodeRem ); -} - - -/**Function************************************************************* - - Synopsis [Factoring cube.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Kit_Edge_t Kit_SopFactorTrivialCube_rec( Kit_Graph_t * pFForm, unsigned uCube, int nStart, int nFinish ) -{ - Kit_Edge_t eNode1, eNode2; - int i, iLit = -1, nLits, nLits1, nLits2; - assert( uCube ); - // count the number of literals in this interval - nLits = 0; - for ( i = nStart; i < nFinish; i++ ) - if ( Kit_CubeHasLit(uCube, i) ) - { - iLit = i; - nLits++; - } - assert( iLit != -1 ); - // quit if there is only one literal - if ( nLits == 1 ) - return Kit_EdgeCreate( iLit/2, iLit%2 ); // CST - // split the literals into two parts - nLits1 = nLits/2; - nLits2 = nLits - nLits1; -// nLits2 = nLits/2; -// nLits1 = nLits - nLits2; - // find the splitting point - nLits = 0; - for ( i = nStart; i < nFinish; i++ ) - if ( Kit_CubeHasLit(uCube, i) ) - { - if ( nLits == nLits1 ) - break; - nLits++; - } - // recursively construct the tree for the parts - eNode1 = Kit_SopFactorTrivialCube_rec( pFForm, uCube, nStart, i ); - eNode2 = Kit_SopFactorTrivialCube_rec( pFForm, uCube, i, nFinish ); - return Kit_GraphAddNodeAnd( pFForm, eNode1, eNode2 ); -} - -/**Function************************************************************* - - Synopsis [Factoring cube.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Kit_Edge_t Kit_SopFactorTrivialCube( Kit_Graph_t * pFForm, unsigned uCube, int nLits ) -{ - return Kit_SopFactorTrivialCube_rec( pFForm, uCube, 0, nLits ); -} - -/**Function************************************************************* - - Synopsis [Factoring SOP.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Kit_Edge_t Kit_SopFactorTrivial_rec( Kit_Graph_t * pFForm, unsigned * pCubes, int nCubes, int nLits ) -{ - Kit_Edge_t eNode1, eNode2; - int nCubes1, nCubes2; - if ( nCubes == 1 ) - return Kit_SopFactorTrivialCube_rec( pFForm, pCubes[0], 0, nLits ); - // split the cubes into two parts - nCubes1 = nCubes/2; - nCubes2 = nCubes - nCubes1; -// nCubes2 = nCubes/2; -// nCubes1 = nCubes - nCubes2; - // recursively construct the tree for the parts - eNode1 = Kit_SopFactorTrivial_rec( pFForm, pCubes, nCubes1, nLits ); - eNode2 = Kit_SopFactorTrivial_rec( pFForm, pCubes + nCubes1, nCubes2, nLits ); - return Kit_GraphAddNodeOr( pFForm, eNode1, eNode2 ); -} - -/**Function************************************************************* - - Synopsis [Factoring the cover, which has no algebraic divisors.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Kit_Edge_t Kit_SopFactorTrivial( Kit_Graph_t * pFForm, Kit_Sop_t * cSop, int nLits ) -{ - return Kit_SopFactorTrivial_rec( pFForm, cSop->pCubes, cSop->nCubes, nLits ); -} - - -/**Function************************************************************* - - Synopsis [Testing procedure for the factoring code.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Kit_FactorTest( unsigned * pTruth, int nVars ) -{ - Vec_Int_t * vCover, * vMemory; - Kit_Graph_t * pGraph; -// unsigned uTruthRes; - int RetValue; - - // derive SOP - vCover = Vec_IntAlloc( 0 ); - RetValue = Kit_TruthIsop( pTruth, nVars, vCover, 0 ); - assert( RetValue == 0 ); - - // derive factored form - vMemory = Vec_IntAlloc( 0 ); - pGraph = Kit_SopFactor( vCover, 0, nVars, vMemory ); -/* - // derive truth table - assert( nVars <= 5 ); - uTruthRes = Kit_GraphToTruth( pGraph ); - if ( uTruthRes != pTruth[0] ) - printf( "Verification failed!" ); -*/ - printf( "Vars = %2d. Cubes = %3d. FFNodes = %3d. FF_memory = %3d.\n", - nVars, Vec_IntSize(vCover), Kit_GraphNodeNum(pGraph), Vec_IntSize(vMemory) ); - - Vec_IntFree( vMemory ); - Vec_IntFree( vCover ); - Kit_GraphFree( pGraph ); -} - -//////////////////////////////////////////////////////////////////////// -/// END OF FILE /// -//////////////////////////////////////////////////////////////////////// - - |