diff options
Diffstat (limited to 'src/misc/extra/extraBddMisc.c')
| -rw-r--r-- | src/misc/extra/extraBddMisc.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/src/misc/extra/extraBddMisc.c b/src/misc/extra/extraBddMisc.c index cdded9b8..69309a4d 100644 --- a/src/misc/extra/extraBddMisc.c +++ b/src/misc/extra/extraBddMisc.c @@ -1013,6 +1013,32 @@ DdNode * Extra_bddComputeCube( DdManager * dd, DdNode ** bXVars, int nVars ) return bRes; } +/**Function******************************************************************** + + Synopsis [Changes the polarity of vars listed in the cube.] + + Description [] + + SideEffects [] + + SeeAlso [] + +******************************************************************************/ +DdNode * Extra_bddChangePolarity( + DdManager * dd, /* the DD manager */ + DdNode * bFunc, + DdNode * bVars) +{ + DdNode *res; + do { + dd->reordered = 0; + res = extraBddChangePolarity( dd, bFunc, bVars ); + } while (dd->reordered == 1); + return(res); + +} /* end of Extra_bddChangePolarity */ + + /*---------------------------------------------------------------------------*/ /* Definition of internal functions */ /*---------------------------------------------------------------------------*/ @@ -1659,6 +1685,121 @@ cuddBddPermuteRecur( DdManager * manager /* DD manager */ , } /* end of cuddBddPermuteRecur */ +/**Function******************************************************************** + + Synopsis [Performs the reordering-sensitive step of Extra_bddChangePolarity().] + + Description [] + + SideEffects [] + + SeeAlso [] + +******************************************************************************/ +DdNode * extraBddChangePolarity( + DdManager * dd, /* the DD manager */ + DdNode * bFunc, + DdNode * bVars) +{ + DdNode * bRes; + + if ( bVars == b1 ) + return bFunc; + if ( Cudd_IsConstant(bFunc) ) + return bFunc; + + if ( bRes = cuddCacheLookup2(dd, extraBddChangePolarity, bFunc, bVars) ) + return bRes; + else + { + DdNode * bFR = Cudd_Regular(bFunc); + int LevelF = dd->perm[bFR->index]; + int LevelV = dd->perm[bVars->index]; + + if ( LevelV < LevelF ) + bRes = extraBddChangePolarity( dd, bFunc, cuddT(bVars) ); + else // if ( LevelF <= LevelV ) + { + DdNode * bRes0, * bRes1; + DdNode * bF0, * bF1; + DdNode * bVarsNext; + + // cofactor the functions + if ( bFR != bFunc ) // bFunc is complemented + { + bF0 = Cudd_Not( cuddE(bFR) ); + bF1 = Cudd_Not( cuddT(bFR) ); + } + else + { + bF0 = cuddE(bFR); + bF1 = cuddT(bFR); + } + + if ( LevelF == LevelV ) + bVarsNext = cuddT(bVars); + else + bVarsNext = bVars; + + bRes0 = extraBddChangePolarity( dd, bF0, bVarsNext ); + if ( bRes0 == NULL ) + return NULL; + cuddRef( bRes0 ); + + bRes1 = extraBddChangePolarity( dd, bF1, bVarsNext ); + if ( bRes1 == NULL ) + { + Cudd_RecursiveDeref( dd, bRes0 ); + return NULL; + } + cuddRef( bRes1 ); + + if ( LevelF == LevelV ) + { // swap the cofactors + DdNode * bTemp; + bTemp = bRes0; + bRes0 = bRes1; + bRes1 = bTemp; + } + + /* only aRes0 and aRes1 are referenced at this point */ + + /* consider the case when Res0 and Res1 are the same node */ + if ( bRes0 == bRes1 ) + bRes = bRes1; + /* consider the case when Res1 is complemented */ + else if ( Cudd_IsComplement(bRes1) ) + { + bRes = cuddUniqueInter(dd, bFR->index, Cudd_Not(bRes1), Cudd_Not(bRes0)); + if ( bRes == NULL ) + { + Cudd_RecursiveDeref(dd,bRes0); + Cudd_RecursiveDeref(dd,bRes1); + return NULL; + } + bRes = Cudd_Not(bRes); + } + else + { + bRes = cuddUniqueInter( dd, bFR->index, bRes1, bRes0 ); + if ( bRes == NULL ) + { + Cudd_RecursiveDeref(dd,bRes0); + Cudd_RecursiveDeref(dd,bRes1); + return NULL; + } + } + cuddDeref( bRes0 ); + cuddDeref( bRes1 ); + } + + /* insert the result into cache */ + cuddCacheInsert2(dd, extraBddChangePolarity, bFunc, bVars, bRes); + return bRes; + } +} /* end of extraBddChangePolarity */ + + //////////////////////////////////////////////////////////////////////// /// END OF FILE /// //////////////////////////////////////////////////////////////////////// |