Procedures to generate constant-argument multipliers.

2 files changed, 302 insertions, 0 deletions

diff --git a/src/misc/extra/extraUtilMacc.c b/src/misc/extra/extraUtilMacc.c
new file mode 100644
index 00000000..1d058f3b
--- /dev/null
+++ b/src/misc/extra/extraUtilMacc.c
@@ -0,0 +1,301 @@
+/**CFile****************************************************************
+
+  FileName    [extraUtilMacc.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [extra]
+
+  Synopsis    [Generates multiplier accumulators.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: extraUtilMacc.c,v 1.0 2003/02/01 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include "misc/vec/vec.h"
+#include "misc/vec/vecMem.h"
+#include "misc/extra/extra.h"
+#include "misc/util/utilTruth.h"
+
+ABC_NAMESPACE_IMPL_START
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Wlc_ConstMultSpecOne( FILE * pFile, int n, int nBits, int nWidth )
+{
+    int nTotal = nWidth+nBits;
+    int Bound  = 1 << (nBits-1);
+    char Sign  = n < 0 ? '_' : ' ';
+    assert( -Bound <= n && n < Bound );
+    fprintf( pFile, "// %d-bit multiplier by %d-bit constant %d generated by ABC\n", nWidth, nBits, n );
+    fprintf( pFile, "module mul%03d%s (\n", Abc_AbsInt(n), n < 0 ? "_neg" : "_pos" );
+    fprintf( pFile, "    input  [%d:0] i,\n", nWidth-1 );
+    fprintf( pFile, "    output [%d:0] o\n", nWidth-1 );
+    fprintf( pFile, ");\n" );
+    fprintf( pFile, "    wire [%d:0] c = %d\'h%x;\n",          nBits-1,  nBits, Abc_AbsInt(n) );
+    fprintf( pFile, "    wire [%d:0] I = {{%d{i[%d]}}, i};\n",  nTotal-1, nBits, nWidth-1 );
+    fprintf( pFile, "    wire [%d:0] m = I * c;\n",            nTotal-1 );
+    fprintf( pFile, "    wire [%d:0] t = %cm;\n",              nTotal-1, n < 0 ? '-' : ' ' );
+    fprintf( pFile, "    assign o = t[%d:%d];\n",              nTotal-1, nBits );
+    fprintf( pFile, "endmodule\n\n" );
+}
+void Wlc_ConstMultSpecTest()
+{
+    int nBits  =  8;
+    int nWidth = 16;
+    int Bound  =  1 << (nBits-1);
+    int i;
+    char Buffer[100];
+    FILE * pFile;
+    for ( i = -Bound; i < Bound; i++ )
+    {
+        sprintf( Buffer, "const_mul//spec%03d.v", 0xFF & i );
+        pFile = fopen( Buffer, "wb" );
+        Wlc_ConstMultSpecOne( pFile, i, nBits, nWidth );
+        fclose( pFile );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Wlc_ConstMultGenerate( int nBits )
+{
+    unsigned Mask = Abc_InfoMask( nBits );
+    Vec_Wec_t * vDivs = Vec_WecStart( 2*nBits );
+    Vec_Int_t * vOne, * vTwo, * vThree;
+    unsigned * pPlace = ABC_CALLOC( unsigned, (1 << nBits) );
+    int n, a, b, One, Two, i, k, New, Bound = 1 << (nBits-1);
+    // skip trivial
+    pPlace[0] = ~0;
+    pPlace[1] = ~0;
+    pPlace[Mask & (-1)] = ~0;
+    // skip div by 2
+    for ( i = 2; i < (1 << nBits); i++ )
+        if ( (i & 1) == 0 )
+            pPlace[i] = ~0;
+    // collect trivial
+    printf( "Generating numbers using %d adders:\n", 0 );
+    for ( i = 0; i < nBits; i++ )
+    {
+        Vec_WecPush( vDivs, 0, 1<<i );
+        printf( "%d = %d << %d\n", 1<<i, 1, i );
+    }
+    // generate for each adder count
+    for ( n = 1; n < nBits; n++ )
+    {
+        // quit if all of them are finished
+        for ( a = 1; a < (1 << nBits); a++ )
+            if ( pPlace[a] == 0 )
+                break;
+        if ( a == (1 << nBits) )
+            break;
+
+        printf( "Generating numbers using %d adders:\n", n );
+        vThree = Vec_WecEntry( vDivs, n );
+        for ( a = 0; a < nBits; a++ )
+        for ( b = 0; b < nBits; b++ )
+        {
+            if ( a + b != n-1 )
+                continue;
+            vOne = Vec_WecEntry( vDivs, a );
+            vTwo = Vec_WecEntry( vDivs, b );
+            Vec_IntForEachEntry( vOne, One, i )
+            Vec_IntForEachEntry( vTwo, Two, k )
+            {
+                New = One + Two;
+                if ( New >= -Bound && New < Bound && pPlace[Mask & New] == 0 )
+                {
+                    if ( New > 0 )
+                        Vec_IntPush( vThree, New );
+
+                    pPlace[Mask & New] = (One << 16) | Two;
+                    printf( "%d = %d + %d\n", New, One, Two );
+                }
+                New = One - Two;
+                if ( New >= -Bound && New < Bound && pPlace[Mask & New] == 0 )
+                {
+                    if ( New > 0 )
+                        Vec_IntPush( vThree, New );
+
+                    pPlace[Mask & New] = (One << 16) | Two | (1 << 15);
+                    printf( "%d = %d - %d\n", New, One, Two );
+                }
+                New = Two - One;
+                if ( New >= -Bound && New < Bound && pPlace[Mask & New] == 0 )
+                {
+                    if ( New > 0 )
+                        Vec_IntPush( vThree, New );
+
+                    pPlace[Mask & New] = (Two << 16) | One | (1 << 15);
+                    printf( "%d = %d - %d\n", New, Two, One );
+                }
+            }
+            printf( "Adding one incrementor:\n" );
+            Vec_IntForEachEntry( vThree, One, i )
+            {
+                if ( One < 0 )
+                    continue;
+                New = -One;
+                if ( pPlace[Mask & New] == 0 )
+                {
+                    pPlace[Mask & New] = One << 16;
+                    printf( "-%d = ~%d + 1\n", One, One );
+                }
+            }
+        }
+    }
+    Vec_WecPrint( vDivs, 0 );
+    Vec_WecFree( vDivs );
+    //ABC_FREE( pPlace );
+    return pPlace;
+}
+void Wlc_ConstMultGenTest0()
+{
+    int nBits  =  8;
+    unsigned * p = Wlc_ConstMultGenerate( nBits );
+    ABC_FREE( p );
+}
+
+void Wlc_ConstMultGenOne_rec( FILE * pFile, unsigned * p, int n, int nBits, int nWidth )
+{
+    unsigned Mask = Abc_InfoMask( nBits );
+    unsigned New  = Mask & (unsigned)n;
+    int nTotal    = nWidth+nBits;
+    int One = p[New] >> 16;
+    int Two = p[New] & 0x7FFF;
+    char Sign  = n < 0 ? 'N' : 'n';
+    char Oper  = ((p[New] >> 15) & 1) ? '-' : '+';
+    if ( p[New] == ~0 )
+    {
+        // count trailing zeros
+        int nn, nZeros;
+        for ( nZeros = 0; nZeros < nBits; nZeros++ )
+            if ( (n >> nZeros) & 1 )
+                break;
+        nn = n >> nZeros;
+        if ( nn == -1 )
+            fprintf( pFile, "    wire [%d:0] N1 = -n1;\n", nTotal-1 );
+        if ( Abc_AbsInt(nn) != 1 )
+            Wlc_ConstMultGenOne_rec( pFile, p, nn, nBits, nWidth );
+        if ( nZeros > 0 )
+            fprintf( pFile, "    wire [%d:0] %c%d = %c%d << %d;\n", nTotal-1, Sign, Abc_AbsInt(n), Sign, Abc_AbsInt(nn), nZeros );
+    }
+    else if ( One && Two ) // add/sub
+    {
+        Wlc_ConstMultGenOne_rec( pFile, p, One, nBits, nWidth );
+        Wlc_ConstMultGenOne_rec( pFile, p, Two, nBits, nWidth );
+        fprintf( pFile, "    wire [%d:0] %c%d = n%d %c n%d;\n", nTotal-1, Sign, Abc_AbsInt(n), One, Oper, Two );
+    }
+    else if ( Two == 0 ) // minus
+    {
+        Wlc_ConstMultGenOne_rec( pFile, p, One, nBits, nWidth );
+        fprintf( pFile, "    wire [%d:0] N%d = -n%d;\n", nTotal-1, One, One );
+    }
+}
+void Wlc_ConstMultGenMult( FILE * pFile, unsigned * p, int n, int nBits, int nWidth )
+{
+    int nTotal = nWidth+nBits;
+    int Bound  = 1 << (nBits-1);
+    char Sign  = n < 0 ? 'N' : 'n';
+    assert( -Bound <= n && n < Bound );
+    fprintf( pFile, "// %d-bit multiplier by %d-bit constant %d generated by ABC\n", nWidth, nBits, n );
+    fprintf( pFile, "module mul%03d%s (\n", Abc_AbsInt(n), n < 0 ? "_neg" : "_pos" );
+    fprintf( pFile, "    input  [%d:0] i,\n", nWidth-1 );
+    fprintf( pFile, "    output [%d:0] o\n", nWidth-1 );
+    fprintf( pFile, ");\n" );
+    if ( n == 0 )
+        fprintf( pFile, "    assign o = %d\'h0;\n", nWidth );
+    else 
+    {
+        fprintf( pFile, "    wire [%d:0] n1 = {{%d{i[%d]}}, i};\n", nTotal-1, nBits, nWidth-1 );
+        Wlc_ConstMultGenOne_rec( pFile, p, n, nBits, nWidth );
+        fprintf( pFile, "    assign o = %c%d[%d:%d];\n", Sign, Abc_AbsInt(n), nTotal-1, nBits );
+    }
+    fprintf( pFile, "endmodule\n\n" );
+}
+void Wlc_ConstMultGenMacc( FILE * pFile, unsigned * p, int n, int nBits, int nWidth )
+{
+    int nTotal = nWidth+nBits;
+    int Bound  = 1 << (nBits-1);
+    char Sign  = n < 0 ? 'N' : 'n';
+    assert( -Bound <= n && n < Bound );
+    fprintf( pFile, "// %d-bit multiplier-accumulator by %d-bit constant %d generated by ABC\n", nWidth, nBits, n );
+    fprintf( pFile, "module macc%03d%s (\n", Abc_AbsInt(n), n < 0 ? "_neg" : "_pos" );
+    fprintf( pFile, "    input  [%d:0] i,\n", nWidth-1 );
+    fprintf( pFile, "    input  [%d:0] c,\n", nWidth-1 );
+    fprintf( pFile, "    output [%d:0] o\n", nWidth-1 );
+    fprintf( pFile, ");\n" );
+    if ( n == 0 )
+        fprintf( pFile, "    assign o = %d\'h0;\n", nWidth );
+    else 
+    {
+        fprintf( pFile, "    wire [%d:0] n1 = {{%d{i[%d]}}, i};\n", nTotal-1, nBits, nWidth-1 );
+        Wlc_ConstMultGenOne_rec( pFile, p, n, nBits, nWidth );
+        fprintf( pFile, "    wire [%d:0] s = %c%d[%d:%d];\n", nWidth-1, Sign, Abc_AbsInt(n), nTotal-1, nBits );
+        fprintf( pFile, "    assign o = s + c;\n" );
+    }
+    fprintf( pFile, "endmodule\n\n" );
+}
+void Wlc_ConstMultGenTest()
+{
+    int nBits  =  8;
+    int nWidth = 16;
+    int Bound  =  1 << (nBits-1);
+    unsigned * p = Wlc_ConstMultGenerate( nBits );
+    int i;
+    char Buffer[100];
+    FILE * pFile;
+    for ( i = -Bound; i < Bound; i++ )
+    {
+        sprintf( Buffer, "const_mul//macc%03d.v", 0xFF & i );
+        pFile = fopen( Buffer, "wb" );
+        Wlc_ConstMultGenMacc( pFile, p, i, nBits, nWidth );
+        fclose( pFile );
+    }
+    ABC_FREE( p );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+
diff --git a/src/misc/extra/module.make b/src/misc/extra/module.make
index 9db290e5..3d54796b 100644
--- a/src/misc/extra/module.make
+++ b/src/misc/extra/module.make
@@ -4,6 +4,7 @@ SRC +=    src/misc/extra/extraUtilBitMatrix.c \
     src/misc/extra/extraUtilDsd.c \
     src/misc/extra/extraUtilEnum.c \
     src/misc/extra/extraUtilFile.c \
+    src/misc/extra/extraUtilMacc.c \
     src/misc/extra/extraUtilMaj.c \
     src/misc/extra/extraUtilMemory.c \
     src/misc/extra/extraUtilMisc.c \