Generating adder-trees using 'gen -b -A <num> -N <num> <file>.v'.

src/base/abci/abc.c

@@ -12183,9 +12183,11 @@ int Abc_CommandGen( Abc_Frame_t * pAbc, int argc, char ** argv )
 //    Abc_Ntk_t * pNtk = Abc_FrameReadNtk(pAbc);
     int c;
     int nVars;    // the number of variables
+    int nArgs;    // the number of arguments
     int nLutSize = -1; // the size of LUTs
     int nLuts = -1;    // the number of LUTs
     int fAdder;
+    int fAdderTree;
     int fSorter;
     int fMesh;
     int fMulti;
@@ -12202,10 +12204,13 @@ int Abc_CommandGen( Abc_Frame_t * pAbc, int argc, char ** argv )
     extern void Abc_GenFpga( char * pFileName, int nLutSize, int nLuts, int nVars );
     extern void Abc_GenOneHot( char * pFileName, int nVars );
     extern void Abc_GenRandom( char * pFileName, int nPis );
+    extern void Abc_GenAdderTree( char * pFileName, int nArgs, int nBits );
 
     // set defaults
     nVars = 8;
+    nArgs = 8;
     fAdder = 0;
+    fAdderTree = 0;
     fSorter = 0;
     fMesh = 0;
     fMulti = 0;
@@ -12214,7 +12219,7 @@ int Abc_CommandGen( Abc_Frame_t * pAbc, int argc, char ** argv )
     fRandom = 0;
     fVerbose = 0;
     Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "NKLasemftrvh" ) ) != EOF )
+    while ( ( c = Extra_UtilGetopt( argc, argv, "NAKLabsemftrvh" ) ) != EOF )
     {
         switch ( c )
         {
@@ -12229,6 +12234,17 @@ int Abc_CommandGen( Abc_Frame_t * pAbc, int argc, char ** argv )
             if ( nVars < 0 )
                 goto usage;
             break;
+        case 'A':
+            if ( globalUtilOptind >= argc )
+            {
+                Abc_Print( -1, "Command line switch \"-A\" should be followed by an integer.\n" );
+                goto usage;
+            }
+            nArgs = atoi(argv[globalUtilOptind]);
+            globalUtilOptind++;
+            if ( nArgs < 0 )
+                goto usage;
+            break;
         case 'K':
             if ( globalUtilOptind >= argc )
             {
@@ -12254,6 +12270,9 @@ int Abc_CommandGen( Abc_Frame_t * pAbc, int argc, char ** argv )
         case 'a':
             fAdder ^= 1;
             break;
+        case 'b':
+            fAdderTree ^= 1;
+            break;
         case 's':
             fSorter ^= 1;
             break;
@@ -12309,6 +12328,14 @@ int Abc_CommandGen( Abc_Frame_t * pAbc, int argc, char ** argv )
         Abc_GenOneHot( FileName, nVars );
     else if ( fRandom )
         Abc_GenRandom( FileName, nVars );
+    else if ( fAdderTree )
+    {
+        printf( "Generating adder tree with %d arguments and %d bits.\n", nArgs, nVars );
+        Abc_GenAdderTree( FileName, nArgs, nVars );
+        sprintf( Command, "%%read %s; %%blast; &put", FileName );
+        Cmd_CommandExecute( pAbc, Command );
+        return 0;
+    }
     else
     {
         Abc_Print( -1, "Type of circuit is not specified.\n" );
@@ -12320,12 +12347,14 @@ int Abc_CommandGen( Abc_Frame_t * pAbc, int argc, char ** argv )
     return 0;
 
 usage:
-    Abc_Print( -2, "usage: gen [-NKL num] [-asemftrvh] <file>\n" );
+    Abc_Print( -2, "usage: gen [-NAKL num] [-asemftrvh] <file>\n" );
     Abc_Print( -2, "\t         generates simple circuits\n" );
     Abc_Print( -2, "\t-N num : the number of variables [default = %d]\n", nVars );
+    Abc_Print( -2, "\t-A num : the number of agruments (for adder tree) [default = %d]\n", nArgs );
     Abc_Print( -2, "\t-K num : the LUT size (to be used with switch -f) [default = %d]\n", nLutSize );
     Abc_Print( -2, "\t-L num : the LUT count (to be used with switch -f) [default = %d]\n", nLuts );
     Abc_Print( -2, "\t-a     : generate ripple-carry adder [default = %s]\n", fAdder? "yes": "no" );
+    Abc_Print( -2, "\t-b     : generate an adder tree [default = %s]\n", fAdderTree? "yes": "no" );
     Abc_Print( -2, "\t-s     : generate a sorter [default = %s]\n", fSorter? "yes": "no" );
     Abc_Print( -2, "\t-e     : generate a mesh [default = %s]\n", fMesh? "yes": "no" );
     Abc_Print( -2, "\t-m     : generate a multiplier [default = %s]\n", fMulti? "yes": "no" );
@@ -13206,6 +13235,7 @@ int Abc_CommandTest( Abc_Frame_t * pAbc, int argc, char ** argv )
 //        Cba_PrsReadBlifTest();
     }
 //    Abc_NtkComputePaths( Abc_FrameReadNtk(pAbc) );
+    Abc_GenAdderTree( "at_4_8.v", 4, 8 );
     return 0;
 usage:
     Abc_Print( -2, "usage: test [-CKDNM] [-aovwh] <file_name>\n" );

src/base/abci/abcGen.c

@@ -821,6 +821,55 @@ void Abc_GenFsm( char * pFileName, int nPis, int nPos, int nStates, int nLines,
     Vec_StrFree( vCond );
 }
 
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Abc_AdderTree( FILE * pFile, int nArgs, int nBits )
+{
+    int i, k, nDigits = Abc_Base10Log( nBits ), Log2 = Abc_Base2Log( nArgs );
+    assert( nArgs > 1 && nBits > 1 );
+    fprintf( pFile, "module adder_tree_%d_%d (\n   ", nArgs, nBits );
+    for ( i = 0; i < nBits; i++, fprintf(pFile, "\n   ") )
+        for ( k = 0; k < nArgs; k++ )
+            fprintf( pFile, " %c%0*d,", 'a'+k, nDigits, nBits-1-i );
+    fprintf( pFile, " z\n" );
+    fprintf( pFile, "  );\n" );
+    for ( i = 0; i < nBits; i++ )
+    {
+        fprintf( pFile, "  input" );
+        for ( k = 0; k < nArgs; k++ )
+            fprintf( pFile, " %c%0*d%s", 'a'+k, nDigits, nBits-1-i, k==nArgs-1 ? "":"," );
+        fprintf( pFile, ";\n" );
+    }
+    fprintf( pFile, "  output [%d:0] z;\n", nBits+Log2-1 );
+    for ( i = 0; i < nArgs; i++ )
+    {
+        fprintf( pFile, "  wire [%d:0] t%d = {", nBits-1, i );
+        for ( k = 0; k < nBits; k++ )
+            fprintf( pFile, " %c%0*d%s", 'a'+i, nDigits, nBits-1-k, k==nBits-1 ? "":"," );
+        fprintf( pFile, " };\n" );
+    }
+    for ( i = 0; i < nArgs-1; i++ )
+        fprintf( pFile, "  wire [%d:0] s%d = t%d + %s%d;\n", nBits+Log2-1, i+1, i+1, i ? "s":"t", i );
+    fprintf( pFile, "  assign z = s%d;\n", nArgs-1 );
+    fprintf( pFile, "endmodule\n\n" ); 
+}
+void Abc_GenAdderTree( char * pFileName, int nArgs, int nBits )
+{
+    FILE * pFile = fopen( pFileName, "w" );
+    fprintf( pFile, "// %d-argument %d-bit adder-tree generated by ABC on %s\n", nArgs, nBits, Extra_TimeStamp() );
+    Abc_AdderTree( pFile, nArgs, nBits );
+    fclose( pFile );
+}
+
 ////////////////////////////////////////////////////////////////////////
 ///                       END OF FILE                                ///
 ////////////////////////////////////////////////////////////////////////