diff options
Diffstat (limited to 'src/bool')
| -rw-r--r-- | src/bool/dec/decFactor.c | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/src/bool/dec/decFactor.c b/src/bool/dec/decFactor.c index febaa905..391496e1 100644 --- a/src/bool/dec/decFactor.c +++ b/src/bool/dec/decFactor.c @@ -57,23 +57,20 @@ Dec_Graph_t * Dec_Factor( char * pSop ) Mvc_Cover_t * pCover; Dec_Graph_t * pFForm; Dec_Edge_t eRoot; + if ( Abc_SopIsConst0(pSop) ) + return Dec_GraphCreateConst0(); + if ( Abc_SopIsConst1(pSop) ) + return Dec_GraphCreateConst1(); // derive the cover from the SOP representation pCover = Dec_ConvertSopToMvc( pSop ); // make sure the cover is CCS free (should be done before CST) Mvc_CoverContain( pCover ); + // check for trivial functions - if ( Mvc_CoverIsEmpty(pCover) ) - { - Mvc_CoverFree( pCover ); - return Dec_GraphCreateConst0(); - } - if ( Mvc_CoverIsTautology(pCover) ) - { - Mvc_CoverFree( pCover ); - return Dec_GraphCreateConst1(); - } + assert( !Mvc_CoverIsEmpty(pCover) ); + assert( !Mvc_CoverIsTautology(pCover) ); // perform CST Mvc_CoverInverse( pCover ); // CST @@ -334,6 +331,7 @@ Mvc_Cover_t * Dec_ConvertSopToMvc( char * pSop ) // start the cover nVars = Abc_SopGetVarNum(pSop); + assert( nVars > 0 ); pMvc = Mvc_CoverAlloc( pMem, nVars * 2 ); // check the logic function of the node Abc_SopForEachCube( pSop, nVars, pCube ) |