Added switch to control duplication of logic after mapping.

.hgignore

@@ -16,6 +16,7 @@ src/ext/
 src/xxx/
 src/aig/au/
 src/aig/ssm/
+src/aig/ddb/
 
 *~
 *.orig

abclib.dsp

@@ -4370,6 +4370,42 @@ SOURCE=.\src\aig\ssm\ssmSimulate.c
 SOURCE=.\src\aig\ssm\ssmWrite.c
 # End Source File
 # End Group
+# Begin Group "ddb"
+
+# PROP Default_Filter ""
+# Begin Source File
+
+SOURCE=.\src\aig\ddb\ddb.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\src\aig\ddb\ddb.h
+# End Source File
+# Begin Source File
+
+SOURCE=.\src\aig\ddb\ddbGarb.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\src\aig\ddb\ddbInt.h
+# End Source File
+# Begin Source File
+
+SOURCE=.\src\aig\ddb\ddbMan.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\src\aig\ddb\ddbOper.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\src\aig\ddb\ddbReo.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\src\aig\ddb\ddbTable.c
+# End Source File
+# End Group
 # End Group
 # End Group
 # Begin Group "Header Files"

src/base/abci/abc.c

@@ -12682,7 +12682,7 @@ int Abc_CommandIf( Abc_Frame_t * pAbc, int argc, char ** argv )
 
     fLutMux = 0;
     Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "KCFADEqaflepmrsdbugvh" ) ) != EOF )
+    while ( ( c = Extra_UtilGetopt( argc, argv, "KCFADEqaflepmrsdbugovh" ) ) != EOF )
     {
         switch ( c )
         {
@@ -12793,6 +12793,9 @@ int Abc_CommandIf( Abc_Frame_t * pAbc, int argc, char ** argv )
         case 'g':
             pPars->fDelayOpt ^= 1;
             break;
+        case 'o':
+            pPars->fUseBuffs ^= 1;
+            break;
         case 'v':
             pPars->fVerbose ^= 1;
             break;
@@ -12949,7 +12952,7 @@ usage:
         sprintf( LutSize, "library" );
     else
         sprintf( LutSize, "%d", pPars->nLutSize );
-    Abc_Print( -2, "usage: if [-KCFA num] [-DE float] [-qarlepmsdbugvh]\n" );
+    Abc_Print( -2, "usage: if [-KCFA num] [-DE float] [-qarlepmsdbugovh]\n" );
     Abc_Print( -2, "\t           performs FPGA technology mapping of the network\n" );
     Abc_Print( -2, "\t-K num   : the number of LUT inputs (2 < num < %d) [default = %s]\n", IF_MAX_LUTSIZE+1, LutSize );
     Abc_Print( -2, "\t-C num   : the max number of priority cuts (0 < num < 2^12) [default = %d]\n", pPars->nCutsMax );
@@ -12970,6 +12973,7 @@ usage:
     Abc_Print( -2, "\t-b       : toggles the use of one special feature [default = %s]\n", pPars->fUseBat? "yes": "no" );
     Abc_Print( -2, "\t-u       : toggles the use of MUXes along with LUTs [default = %s]\n", fLutMux? "yes": "no" );
     Abc_Print( -2, "\t-g       : toggles global delay optimization [default = %s]\n", pPars->fDelayOpt? "yes": "no" );
+    Abc_Print( -2, "\t-o       : toggles using buffers to decouple combinational outputs [default = %s]\n", pPars->fUseBuffs? "yes": "no" );
     Abc_Print( -2, "\t-v       : toggles verbose output [default = %s]\n", pPars->fVerbose? "yes": "no" );
     Abc_Print( -2, "\t-h       : prints the command usage\n");
     return 1;

src/base/abci/abcIf.c

@@ -282,7 +282,7 @@ Abc_Ntk_t * Abc_NtkFromIf( If_Man_t * pIfMan, Abc_Ntk_t * pNtk )
     if ( pIfMan->pPars->fUseBdds )
         Abc_NtkBddReorder( pNtkNew, 0 );
     // decouple the PO driver nodes to reduce the number of levels
-    nDupGates = Abc_NtkLogicMakeSimpleCos( pNtkNew, 1 );
+    nDupGates = Abc_NtkLogicMakeSimpleCos( pNtkNew, !pIfMan->pPars->fUseBuffs );
     if ( nDupGates && pIfMan->pPars->fVerbose )
         printf( "Duplicated %d gates to decouple the CO drivers.\n", nDupGates );
     return pNtkNew;

src/map/if/if.h

@@ -95,6 +95,7 @@ struct If_Par_t_
     int                fSeqMap;       // sequential mapping
     int                fBidec;        // use bi-decomposition
     int                fUseBat;       // use one specialized feature
+    int                fUseBuffs;     // use buffers to decouple outputs
     int                fVerbose;      // the verbosity flag
     // internal parameters
     int                fDelayOpt;     // special delay optimization