Adding switch -C <num> to 'amap' to control max number of cuts at a node.

src/base/abci/abc.c

@@ -14063,7 +14063,7 @@ int Abc_CommandAmap( Abc_Frame_t * pAbc, int argc, char ** argv )
     fSweep = 0;
     Amap_ManSetDefaultParams( pPars );
     Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "FAEQmxisvh" ) ) != EOF )
+    while ( ( c = Extra_UtilGetopt( argc, argv, "FACEQmxisvh" ) ) != EOF )
     {
         switch ( c )
         {
@@ -14089,6 +14089,17 @@ int Abc_CommandAmap( Abc_Frame_t * pAbc, int argc, char ** argv )
             if ( pPars->nIterArea < 0 )
                 goto usage;
             break;
+        case 'C':
+            if ( globalUtilOptind >= argc )
+            {
+                Abc_Print( -1, "Command line switch \"-C\" should be followed by a floating point number.\n" );
+                goto usage;
+            }
+            pPars->nCutsMax = atoi(argv[globalUtilOptind]);
+            globalUtilOptind++;
+            if ( pPars->nCutsMax < 0 )
+                goto usage;
+            break;
         case 'E':
             if ( globalUtilOptind >= argc )
             {
@@ -14190,10 +14201,11 @@ int Abc_CommandAmap( Abc_Frame_t * pAbc, int argc, char ** argv )
     return 0;
 
 usage:
-    Abc_Print( -2, "usage: amap [-FA <num>] [-EQ <float>] [-mxisvh]\n" );
+    Abc_Print( -2, "usage: amap [-FAC <num>] [-EQ <float>] [-mxisvh]\n" );
     Abc_Print( -2, "\t           performs standard cell mapping of the current network\n" );
     Abc_Print( -2, "\t-F num   : the number of iterations of area flow [default = %d]\n", pPars->nIterFlow );
     Abc_Print( -2, "\t-A num   : the number of iterations of exact area [default = %d]\n", pPars->nIterArea );
+    Abc_Print( -2, "\t-C num   : the maximum number of cuts at a node [default = %d]\n", pPars->nCutsMax );
     Abc_Print( -2, "\t-E float : sets epsilon used for tie-breaking [default = %f]\n", pPars->fEpsilon );
     Abc_Print( -2, "\t-Q float : area/delay preference ratio [default = %.2f (area-only)] \n", pPars->fADratio );
     Abc_Print( -2, "\t-m       : toggles using MUX matching [default = %s]\n", pPars->fUseMuxes? "yes": "no" );

src/map/amap/amap.h

@@ -46,6 +46,7 @@ struct Amap_Par_t_
 {
     int    nIterFlow;   // iterations of area flow
     int    nIterArea;   // iteratoins of exact area
+    int    nCutsMax;    // the maximum number of cuts at a node
     int    fUseMuxes;   // enables the use of MUXes
     int    fUseXors;    // enables the use of XORs
     int    fFreeInvs;   // assume inverters are free (area = 0)

src/map/amap/amapCore.c

@@ -48,6 +48,7 @@ void Amap_ManSetDefaultParams( Amap_Par_t * p )
     memset( p, 0, sizeof(Amap_Par_t) );
     p->nIterFlow = 1;            // iterations of area flow
     p->nIterArea = 4;            // iteratoins of exact area
+    p->nCutsMax  = 500;          // the maximum number of cuts at a node
     p->fUseMuxes = 0;            // enables the use of MUXes
     p->fUseXors  = 1;            // enables the use of XORs
     p->fFreeInvs = 0;            // assume inverters are free (area = 0)

src/map/amap/amapMerge.c

@@ -173,7 +173,7 @@ Amap_Cut_t * Amap_ManCutCreate3( Amap_Man_t * p,
 ***********************************************************************/
 void Amap_ManCutSaveStored( Amap_Man_t * p, Amap_Obj_t * pNode )
 {
-    int nMaxCuts = 500;
+    int nMaxCuts = p->pPars->nCutsMax;
     int * pBuffer;
     Amap_Cut_t * pNext, * pCut;
     int i, nWords, Entry, nCuts, nCuts2;
@@ -522,8 +522,8 @@ void Amap_ManMerge( Amap_Man_t * p )
     if ( p->pPars->fVerbose )
     {
         printf( "AIG object is %d bytes.  ", (int)sizeof(Amap_Obj_t) );
-        printf( "Internal AIG = %5.2f MB.  Cuts = %5.2f MB.\n", 
-            1.0*Amap_ManObjNum(p)*sizeof(Amap_Obj_t)/(1<<20), 1.0*p->nBytesUsed/(1<<20) );
+        printf( "Internal AIG = %5.2f MB.  Cuts = %5.2f MB.  CutsMax = %d.\n", 
+            1.0*Amap_ManObjNum(p)*sizeof(Amap_Obj_t)/(1<<20), 1.0*p->nBytesUsed/(1<<20), p->pPars->nCutsMax );
         printf( "Node =%6d. Try =%9d. Try3 =%10d. Used =%7d. R =%6.2f.  ", 
             Amap_ManNodeNum(p), p->nCutsTried, p->nCutsTried3, p->nCutsUsed, 
             1.0*p->nCutsUsed/Amap_ManNodeNum(p) );