The number of magic squares of order 6

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== An execution example on GeForce RTX-4090 ==
  
  $ nvcc -O3 -arch=sm_60 -maxrregcount=40 ms-20230905.cu -lcrypto
  $ time ./a.out 00000 e00000007 13745 180800250
  ms-20230905.cu
  Size of long long unsigned : 8 
  topbit() works correctly.
  nvecs 32134
  size of p_idx_c 2300 
  DevId: 0  #SM:128, #Blocks:2048 NVIDIA GeForce RTX 4090
  r1:e00000007 r2:180800250
  nrows 3116  n3rd 711  
  row_set.size() 5956644 
  00000 e00000007 13745 180800250    247438137089 824ce60dca0861defc383ee53d3367e7
  
  real    2m51.066s
  user    2m50.265s
  sys     0m0.460s

<file cpp ms-20230905.cu>
/*
ms.cu

Counting number of magic squares up to rotations, 
reflections and M tranformations.

Compilation :

  nvcc -O3 -arch=sm_60 -maxrregcount=40 \
       -Wno-deprecated-declarations ms.cu -lcrypto 

  To omit md5 checksum, add a -DnoMD5 option. Then you may drop 
  -Wnodeprecated-declarations and -lcypto.

  -DV option produces verbose outputs for N=6. 

Command line options:

  % ./a.out  <1stRowNo> <1stRowPattern> <2ndRowNo> <2ndRowPattern>
  example : ./a.out 00000 e00000007 13745 180800250

See also : https://magicsquare6.net/
 
Updated on 2023/09/05.
Authored by Hidetoshi Mino hidetoshimino@gmail.com .

*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <assert.h>
#ifndef noMD5
  #include <openssl/md5.h>
#endif
#include <vector>
using namespace std;

#ifndef N          // order of square : 3..6
  #define N 6
#endif

#ifndef NB_SM      // Number of blocks per SM
  #define NB_SM 16
#endif

#ifndef NW         // Number of Warps per block
  #define NW 3
#endif

#ifndef NSMPL
  #define NSMPL 1
#endif

#ifndef MDIAG
  #define MDIAG 24
#endif

typedef long long unsigned u64;

#define NN (N*N)
#define AllBits ( ( 1ULL << NN ) - 1 )
#define AllLanes (0xffffffff)

#define MAX( x, y ) ( (x) > (y) ? (x) : (y) )
#define CU_SAFE(stmt) \
  do { \
    cudaError_t status = stmt; \
    if (status != cudaSuccess) { \
       printf("ERROR: %s in %s:%d.\n", cudaGetErrorString(status), \
       __FILE__, __LINE__); \
       exit( 1 );  \
    } \
  } while (0)

#define WS 32   /* Warp size */
#define RUWS( x ) ( ( ( x ) + ( WS - 1 ) ) & ~( WS - 1 ) ) /* Round up to WS */
#define RDWS( x ) ( ( x ) & ~( WS - 1 ) )            /* Round down to WS */

__device__ __host__ int topbit( u64 v ) {

#ifdef __CUDA_ARCH__ 
   return 63 - __clzll( v );
#else
   v = v & ( ~( v >> 1 ) );
   float f32 = (float) v;
   int pos = *( (int *) &f32 );
   pos =( pos >> 23 ) - 0x7f;
   return pos;
#endif
/*
  int pos = 0;
  int v32 = v >> 32;
  if( v32 ) {
      pos = 32;
  } else {
     v32 = (int) v;
  }
  if( v32 & 0xffff0000UL ) { pos +=16;  v32 >>= 16; }
  if( v32 & 0x0000ff00UL ) { pos += 8;  v32 >>=  8; }
  if( v32 & 0x000000f0UL ) { pos += 4;  v32 >>=  4; }
  if( v32 & 0x0000000cUL ) { pos += 2;  v32 >>=  2; }
  if( v32 & 0000000002UL ) pos++;
  return pos;
*/
}

__device__ __host__ u64 reverse64( u64 x ) {

#ifdef __CUDA_ARCH__

   return __brevll( x );

#else
   u64 y;
   y = ( ( x & 0x5555555555555555ULL ) << 1 );
   x = ( y | ( ( x >> 1 ) & 0x5555555555555555ULL ) );
   y = ( ( x & 0x3333333333333333ULL ) << 2 );
   x = ( y | ( ( x >> 2 ) & 0x3333333333333333ULL ) );
   y = ( ( x & 0x0F0F0F0F0F0F0F0FULL ) << 4 );
   x = ( y | ( ( x >> 4 ) & 0x0F0F0F0F0F0F0F0FULL ) );
   y = ( ( x & 0x00FF00FF00FF00FFULL ) << 8 );
   x = ( y | ( ( x >> 8 ) & 0x00FF00FF00FF00FFULL ) );
   y = ( ( x & 0x0000FFFF0000FFFFULL ) << 16 );
   x = ( y | ( ( x >> 16 ) & 0x0000FFFF0000FFFFULL ) );
   y = ( ( x & 0x00000000FFFFFFFFULL ) << 32 );
   x = ( y | ( ( x >> 32 ) & 0x00000000FFFFFFFFULL ) );
   return x;
#endif
}

int check_topbit( ) {

   for( int i = 0; i < NN; i ++ ) {
      // printf( "%d %09llx %d\n", i, 1ULL << i, topbit( 1ULL << i ) );
      if( topbit( 1ULL << i ) != i ) return 1;
   }
   for( int i = 1; i < NN; i ++ ) {
      // printf( "%d %09llx %d\n"
      //         , i, ( 1ULL << i ) - 1, topbit( ( 1ULL << i ) - 1 ) );
      if( topbit( ( 1ULL << i ) - 1 ) != i - 1 ) return 1;
   }
   fprintf( stderr, "topbit() works correctly.\n" );
   return 0;
}

__device__ __host__ int vcsize_f( int ncols, int order ) 
{
  return RUWS( ncols )  * ( order - 2 ) + WS; 
}

__device__ __host__ int vxsize_f( int ndiags, int order ) 
{
  return RUWS( ndiags ) * ( order - 1 ) + WS;
}

/* = Host globals ======================= */

#define MVECS 32768
int nvecs = 0;
u64 vecs[ MVECS ];

/* = Constant memory ==================== */

__constant__ u64 v_max_c;
__constant__ u64 rev_max_c;
__constant__ u64 v_second_c;
__constant__ int single_c;
__constant__ int nrowset_c;
__constant__ int ncols_c, ndiags_c;
__constant__ int vcsize_c, vxsize_c;

#define MDPAIR ( MDIAG * MDIAG * MDIAG / 5 + ( WS - 1 ) * MDIAG )

__constant__ int p_offset_c[ MDIAG + 2 ];
__constant__ int p_idx_c[ MDPAIR ];

/* = Block __shared__ ==================== */

__shared__ u64 which_rowv[ NW ][ NN ]; 
__shared__ int which_col[ NW ][ NN ]; 
__shared__ u64 row_vecs[ NW ][ N ]; 
__shared__ u64 col_vecs[ NW ][ N ]; 

/* = Managed ( Unified ) =================== */

__managed__ int i_rowset_m = 0;

__managed__ u64 count_m = 0ULL;

/* ========================================= */

void  Count( int max_row, int second_row, const vector<int> & dev_blocks );
void MakeRows( int m, int l, u64 rem, u64* vrb, u64* vre, vector<u64> & res );

__global__  void RowSet( u64* row_set_d, u64* vc_g, u64* vx_g );
__device__ int MakeCols( int level, u64 rem, 
      u64* const & vcb, const int & nvc, 
      u64* const & vxb, const int & nvx, int single );
__device__ void LastCols( u64 rem, 
       u64* const & vcb, const int & nvc, const int & nvn, 
       u64* const & vxb, const int & nvx, int single, int & sub_count );
__device__ int MakeDiagC( u64* const & vxb, const int & nvx );
__device__ int MakeDiagS( u64* const & vxb, const int & nvx );
__device__ int FinalCheck( 
    u64* const &e2rowv, int* const &e2col, u64* const &col_v, 
    const u64 & vdx, const u64 & vcx );

int Cross( int v1, int v2 ) {
   u64 v = vecs[v1] & vecs[v2];
   return v && ( ! ( v & ( v - 1 ) ) );
}

__device__ __host__ u64 Reverse( u64 v ) 
{ 
  return reverse64( v ) >> (64 - NN); 
}

void GenVecs( int max_ent, int rem_sum, int level, u64 vp ) 
{
  if ( level >= 0 ) {
    for ( int ent = max_ent; ent > 0 ; --ent ) {
      u64 v = 1ULL << ( ent - 1 );
      if ( rem_sum >= ent ) 
        GenVecs( ent - 1, rem_sum - ent, level - 1, vp | v );
    }
  }
  else {
    if ( rem_sum == 0 )  {
       vecs[ nvecs ++ ] = vp;
    }
  }
  if( nvecs > MVECS ) {
    fprintf( stderr, "nvecs > MVECS\n" );
    exit(1);
  }
}

void Count( int max_row, int second_row, const vector<int> & dev_blocks ) 
{
  u64 v_max = vecs[ max_row ];
  u64 v_second = vecs[ second_row ];
  u64 rem = AllBits ^ v_max ^ v_second;
  u64 must_bit = ( 1ULL <<  topbit( rem ) );

  vector<u64> rows;  rows.reserve( nvecs );
  vector<u64> cols;  cols.reserve( nvecs );
  vector<u64> diags; diags.reserve( nvecs );
  
  int n3rd = 0;
  for( int i = second_row + 1; i < nvecs; ++ i ) 
    if( ( ! ( v_max    & vecs[ i ] ) ) &&  ( ! ( v_second & vecs[ i ] ) )
        && v_max >= Reverse( vecs[ i ] ) )  
    {
       rows.push_back( vecs[ i ] );
       if( vecs[ i ] & must_bit ) n3rd ++;
    }
  int nrows = rows.size();

  vector<u64> row_set; row_set.reserve( n3rd * 3000 * ( N - 2 ) );
  u64 vr[ nrows * ( N - 2 ) ]; 
  for( int i = 0; i < nrows; i ++ ) vr[ i ] = rows[ i ];
  fprintf( stderr, "nrows %d  n3rd %d  \n", nrows, n3rd );

  MakeRows( N - 2, 0, rem, vr, vr + nrows, row_set );
  fprintf( stderr, "row_set.size() %lu \n", row_set.size() );

  for( int i = max_row + 1; i < nvecs; ++ i ) 
    if( Cross( max_row, i ) && Cross( second_row, i ) 
        && v_max >= Reverse( vecs[ i ] ) )
    {
       cols.push_back( vecs[ i ] );
    }
  int ncols = cols.size();

  for( int i = 0; i < nvecs; ++ i ) 
    if( Cross( max_row, i ) && Cross( second_row, i ) ) 
       diags.push_back( vecs[ i ] );
  int ndiags = diags.size();

  /* constant parameters for the __global__ RowSet()  */

  u64 rev_max = Reverse( v_max );
  int single = rev_max == v_max || rev_max == v_second;
  int nrowset = row_set.size();
  int vcsize = vcsize_f( ncols, N );
  int vxsize = vxsize_f( ndiags, N );

  // Device Memory Allocation -------------------

  int ndev = dev_blocks.size();

  u64* row_set_d[ ndev ]; 
  u64* vc_d[ ndev ]; 
  u64* vx_d[ ndev ];

  i_rowset_m = 0;  // initialize managed variable
  // count_m = 0ULL; // Don't initialize here.

  for( int idev = 0 ; idev < ndev; idev ++ ) {

    CU_SAFE( cudaSetDevice( idev ) );

    int nblocks = dev_blocks[ idev ];

    CU_SAFE( cudaMalloc( row_set_d + idev, sizeof( u64 ) * row_set.size() ) );
    CU_SAFE( cudaMemcpy( row_set_d[ idev ], row_set.data(), 
                sizeof( u64 ) * row_set.size(), cudaMemcpyHostToDevice ) );

    CU_SAFE( cudaMalloc( vc_d + idev, 
                sizeof(u64) * ( RUWS( ncols )  + vcsize * nblocks * NW ) ) );
    CU_SAFE( cudaMalloc( vx_d + idev, 
                sizeof(u64) * ( RUWS( ndiags ) + vxsize * nblocks * NW ) ) );
    CU_SAFE( cudaMemcpy( vc_d[ idev ], cols.data(), ncols*sizeof(u64), 
                cudaMemcpyHostToDevice ) );
    CU_SAFE( cudaMemcpy( vx_d[ idev ], diags.data(), ndiags*sizeof(u64), 
                cudaMemcpyHostToDevice ) );

    // constant memory setup --------------------

    CU_SAFE( cudaMemcpyToSymbol( v_max_c, &v_max, sizeof( u64 ) ) );
    CU_SAFE( cudaMemcpyToSymbol( v_second_c, &v_second, sizeof( u64 ) ) );
    CU_SAFE( cudaMemcpyToSymbol( rev_max_c, &rev_max, sizeof( u64 ) ) );

    CU_SAFE( cudaMemcpyToSymbol( single_c, &single, sizeof( int ) ) );
    CU_SAFE( cudaMemcpyToSymbol( nrowset_c, &nrowset, sizeof( int ) ) );

    CU_SAFE( cudaMemcpyToSymbol( ncols_c, &ncols, sizeof( int ) ) );
    CU_SAFE( cudaMemcpyToSymbol( ndiags_c, &ndiags, sizeof( int ) ) );

    CU_SAFE( cudaMemcpyToSymbol( vcsize_c, &vcsize, sizeof( int ) ) );
    CU_SAFE( cudaMemcpyToSymbol( vxsize_c, &vxsize, sizeof( int ) ) );

    // ------------------------------------------

    RowSet <<< nblocks, dim3( WS, NW ) >>> ( 
                  row_set_d[ idev ], vc_d[ idev ], vx_d[ idev ] );
  }

  for( int idev = 0 ; idev < ndev; idev ++ ) {

    CU_SAFE( cudaSetDevice( idev ) );
    // cudaDeviceSynchronize();

    // Device Memory Deallocation ----------------

    CU_SAFE( cudaFree( vx_d[ idev ] ) ); 
    CU_SAFE( cudaFree( vc_d[ idev ] ) );  
    CU_SAFE( cudaFree( row_set_d[ idev ] ) );
  }

  return; 
}

void MakeRows( int m, int l, u64 rem, u64* vrb, u64* vre, vector<u64> & res )
{
  static u64 row_vecs[ N ];

  u64 must_bit = ( 1ULL <<  topbit( rem ) );

  for(   ; vrb <  vre; vrb += NSMPL ) {

     u64 row_vec = *vrb;
     if( ! ( row_vec & must_bit ) ) break;

     row_vecs[ l ] = row_vec;

     if( m > l + 1 ) {
        u64* vrp = vrb + 1;
        u64* vrq = vre;
        while( vrp < vre ) {
           *vrq = *vrp;
           vrq += ( row_vec & *vrp ) ? 0 : 1;
           vrp ++;
        }
        MakeRows( m, l + 1, rem ^ row_vec, vre, vrq, res );
     } else {
        for( int i = 0; i < m; i ++ ) {
           res.push_back( row_vecs[ i ] );
        }
     }
  }
}

__device__ int gather_para( u64* const & vp, const int & bv, const int & ev, 
                                              const u64 & x, u64* const & vpn ) 
{
   int j = 0;
   for( int i = RDWS( bv ); i < ev; i += WS ) {
      int i_t = i + threadIdx.x;
      u64 v = -1ULL;
      if( i_t >=bv and i_t < ev ) v = vp[ i_t ];
      int p = ! ( v & x );
      unsigned ballot = __ballot_sync( AllLanes, p );
      unsigned sub_sum = __popc( ballot << ( WS - threadIdx.x ) );
      if( p )
          vpn[ j + sub_sum ] = v;
      j += __shfl_sync( AllLanes, sub_sum + p, WS - 1 );
   }
   return j;
}

__device__ int cnext( u64* vp, int nv, int must_bit )
{
   int j = 0;
   for( int i = 0; i < nv; i += WS ) {
      u64 v = 0ULL;
      if( i + threadIdx.x < nv ) v = vp[ i + threadIdx.x ];
      j += __popc( __ballot_sync( AllLanes, v >> must_bit ) );
      if( j != i + WS ) break;
   }
   return j;
}

__device__ int gather_cross( 
       u64* const & vp, const int & nv, const u64 & x, u64* const & vpn )
{
   int j = 0;
   for( int i = 0; i < nv; i += WS ) {
      int i_t = i + threadIdx.x;
      u64 v = 0ULL;
      if( i_t < nv ) v = vp[ i_t ];
      int p = __popcll( v & x ) == 1; 
      unsigned ballot = __ballot_sync( AllLanes, p );
      unsigned sub_sum = __popc( ballot << ( WS - threadIdx.x ) );
      if( p )
          vpn[ j + sub_sum ] = v;
      j += __shfl_sync( AllLanes, sub_sum + p, WS - 1 );
   }
   return j;
}

__device__ int gather_double_cross( u64* const & vp, const int & nv, 
                       const u64 & x1, const u64 & x2, u64* const & vpn )
{
   int j = 0;
   for( int i = 0; i < nv; i += WS ) {
      int i_t = i + threadIdx.x;
      u64 v = 0ULL;
      if( i_t < nv ) v = vp[ i_t ];
      int p = __popcll( v & x1 ) == 1 and __popcll( v & x2 ) == 1;
      unsigned ballot = __ballot_sync( AllLanes, p );
      unsigned sub_sum = __popc( ballot << ( WS - threadIdx.x ) );
      if( p )
          vpn[ j + sub_sum ] = v;
      j += __shfl_sync( AllLanes, sub_sum + p, WS - 1 );
   }
   return j;
}

__device__ int gather_triple_cross( u64* const & vp, const int & nv, 
             const u64 & x1, const u64 & x2, const u64 & x3, u64* const & vpn )
{
   int j = 0;
   for( int i = 0; i < nv; i += WS ) {
      int i_t = i + threadIdx.x;
      u64 v = 0ULL;
      if( i_t < nv ) v = vp[ i_t ];
      int p = __popcll( v & x1 ) == 1 
          and __popcll( v & x2 ) == 1
          and __popcll( v & x3 ) == 1;
      unsigned ballot = __ballot_sync( AllLanes, p );
      unsigned sub_sum = __popc( ballot << ( WS - threadIdx.x ) );
      if( p )
          vpn[ j + sub_sum ] = v;
      j += __shfl_sync( AllLanes, sub_sum + p, WS - 1 );
   }
   return j;
}

__device__ void set_vec( int index[ 64 ], u64 vecs[ N ], 
                             const u64 & v, const int & level ) 
{
  vecs[ level ] = v;
  if( ( v >> threadIdx.x ) & 1 ) 
     index[ NN-1 - threadIdx.x ] = level;
  if( ( ( v >> WS ) >> threadIdx.x ) & 1 ) 
     index[ NN-1 - WS - threadIdx.x ] = level;
  __syncwarp();
}

__device__ void set_rowv( u64 index[ 64 ], u64 vecs[ N ],  
                             const u64 & v, const int & level ) 
{
  vecs[ level ] = v;
  if( ( v >> threadIdx.x ) & 1 ) 
     index[ NN-1 - threadIdx.x ] = v; //level;
  if( ( ( v >> WS ) >> threadIdx.x ) & 1 ) 
     index[ NN-1 - WS - threadIdx.x ] = v; //level;
  __syncwarp();
}

__global__ void RowSet( u64* rowset, u64* vc_g, u64* vx_g )
{
  #define WHICH_ROW which_rowv[ threadIdx.y ]
  #define ROW_VECS row_vecs[ threadIdx.y ]

  set_rowv( WHICH_ROW, ROW_VECS, v_max_c, N - 1 );
  set_rowv( WHICH_ROW, ROW_VECS, v_second_c, N - 2 );

  __shared__ u64* vc_s[ NW ];
  __shared__ u64* vx_s[ NW ];
  #define VC vc_s[ threadIdx.y ]
  #define VX vx_s[ threadIdx.y ]

  VC = vc_g + RUWS( ncols_c )  + vcsize_c * ( blockIdx.x * NW + threadIdx.y );
  VX = vx_g + RUWS( ndiags_c ) + vxsize_c * ( blockIdx.x * NW + threadIdx.y );

  VC[ vcsize_c - WS ] = 0ULL;
  VX[ vxsize_c - WS ] = 0ULL;

  u64 count = 0ULL;

  for(   ; /* i_rowset < nrowset_c */; /* i_rowset += N - 2 */ ) {

     __shared__ int i_rowset[ NW ];
     #define I_ROWSET i_rowset[ threadIdx.y ]

     if( threadIdx.x == 0 ) {
        I_ROWSET = atomicAdd_system( &i_rowset_m, N - 2 );
     }
     __syncwarp();
     //i_rowset = __shfl_sync( AllLanes, i_rowset, 0 );

     if( I_ROWSET >= nrowset_c ) break;

     __shared__ int single[ NW ];
     #define SINGLE single[ threadIdx.y ]
     SINGLE = single_c;
     for( int i = 0; i < N - 2; i ++ ) {
        u64 row_vec = rowset[ I_ROWSET + i ];
        set_rowv( WHICH_ROW, ROW_VECS, row_vec, N - 3 - i );
        SINGLE = SINGLE or rev_max_c == row_vec;
     }
    
     __shared__ int kvc_s[ NW ];
     __shared__ int kvx_s[ NW ];
     #define KVC kvc_s[ threadIdx.y ]
     #define KVX kvx_s[ threadIdx.y ]
     
#if N == 6
     KVC = gather_triple_cross( vc_g, ncols_c, 
           ROW_VECS[ N - 3 ], ROW_VECS[ N - 4 ], ROW_VECS[ N - 5 ], VC );
     KVX = gather_triple_cross( vx_g, ndiags_c, 
           ROW_VECS[ N - 3 ], ROW_VECS[ N - 4 ], ROW_VECS[ N - 5 ], VX );
#endif
#if N == 5
     KVC = gather_double_cross( vc_g, ncols_c, 
           ROW_VECS[ N - 3 ], ROW_VECS[ N - 4 ], VC );
     KVX = gather_double_cross( vx_g, ndiags_c,
           ROW_VECS[ N - 3 ], ROW_VECS[ N - 4 ], VX );
#endif
#if N == 4
     KVC = gather_cross( vc_g, ncols_c, ROW_VECS[ N - 3 ], VC );
     KVX = gather_cross( vx_g, ndiags_c, ROW_VECS[ N - 3 ], VX );
#endif
#if N == 3
     for( int i = 0; i < ncols_c; i++ ) VC[ i ] = vc_g[ i ];
     for( int i = 0; i < ndiags_c; i++ ) VX[ i ] = vx_g[ i ];
     KVC = ncols_c;
     KVX = ndiags_c;
#endif

     if( KVC < N or KVX < 2 ) continue;

#if N > 3
     // 53 / 51 ?
     count += MakeCols( N - 4, AllBits, VC, KVC, VX, KVX, SINGLE ) ;
#else
     int sub_count = 0;
     int nvn = cnext( VC, KVC, NN - 1 );
     LastCols( AllBits, VC, KVC, nvn, VX, KVX, SINGLE, sub_count );
     count += sub_count;
#endif

     #if N > 5
     #ifdef V
        if( blockIdx.x == 0 and threadIdx.x == 0 )
           printf( "r3:%09llx %9llu \n", ROW_VECS[ N - 3 ], count );
     #endif
     #endif
  }
  if ( VC[ vcsize_c - WS ] != 0ULL ||
       VX[ vxsize_c - WS ] != 0ULL ) {
     printf( " Array over run ! \n");
     assert( 0 );
     // exit( 1 );
  }

  for( int span = ( WS >> 1 ); span > 0; span >>= 1 ) {
     count += __shfl_xor_sync( AllLanes, count, span );
  }
  if( threadIdx.x == 0 ) 
  {
     atomicAdd_system( &count_m, count );
  }
}

#if N > 3
__device__ int MakeCols( int lvl, u64 rem, 
      u64* const & vcb, const int & nvc, 
      u64* const & vxb, const int & nvx, int single )
{
  __shared__ u64  rem_s[ NW ][ N - 3 ];
  __shared__ u64* vcb_s[ NW ][ N - 3 ];
  __shared__ int  nvc_s[ NW ][ N - 3 ]; 
  __shared__ int  nvn_s[ NW ][ N - 3 ];
  __shared__ u64* vxb_s[ NW ][ N - 3 ]; 
  __shared__ int  nvx_s[ NW ][ N - 3 ]; 
  __shared__ int  single_s[ NW ][ N - 3 ]; 

  #define REM_S rem_s[ threadIdx.y ]
  #define VCB_S vcb_s[ threadIdx.y ]
  #define NVC_S nvc_s[ threadIdx.y ]
  #define NVN_S nvn_s[ threadIdx.y ]
  #define VXB_S vxb_s[ threadIdx.y ]
  #define NVX_S nvx_s[ threadIdx.y ]
  #define SINGLE_S single_s[ threadIdx.y ]

  REM_S[ lvl ] = rem;
  VCB_S[ lvl ] = vcb;
  NVC_S[ lvl ] = nvc;
  NVN_S[ lvl ] = cnext( vcb, nvc, topbit( rem ) );
  VXB_S[ lvl ] = vxb;
  NVX_S[ lvl ] = nvx;
  SINGLE_S[ lvl ] = single;

  __shared__ int  ivc_s[ NW ][ N - 3 ];
  #define IVC_S ivc_s[ threadIdx.y ]

  int sub_count = 0;

  Init:

     IVC_S[ lvl ] = 0;

 //  for(  ; ivc_s[ lvl ] < nvn_s[ lvl ]; ivc_s[ lvl ] ++  ) {

  Loop:

     if( IVC_S[ lvl ] >= NVN_S[ lvl ] ) {
        if( lvl == N - 4 ) 
           return sub_count;
        else {
           lvl ++;
           goto ReInit; 
        }
     }

{ // Scope limit for locals.

     __shared__ u64 col_vec[ NW ];
     #define COL_VEC col_vec[ threadIdx.y ]
     COL_VEC  = VCB_S[ lvl ][ IVC_S[ lvl ] ];

     __shared__ u64* vxbn[ NW ];
     #define VXBN vxbn[ threadIdx.y ]
     VXBN = RUWS( NVX_S[ lvl ] ) + VXB_S[ lvl ];

     __shared__ int kvx[ NW ];
     #undef KVX
     #define KVX kvx[ threadIdx.y ]

     KVX = gather_cross( VXB_S[ lvl ], NVX_S[ lvl ], COL_VEC, VXBN ); 
     if ( KVX < 2 ) goto ReInit; // continue;

     __shared__ u64* vcbn[ NW ];
     #define VCBN vcbn[ threadIdx.y ]

     VCBN = RUWS( NVC_S[ lvl ] ) + VCB_S[ lvl ];

     __shared__ int kvc[ NW ];
     #undef KVC
     #define KVC kvc[ threadIdx.y ]

     KVC = gather_para( VCB_S[ lvl ], NVN_S[ lvl ], 
                           NVC_S[ lvl ], COL_VEC, VCBN );  
     __shared__ int kvn[ NW ];
     #define KVN kvn[ threadIdx.y ]

     KVN = cnext( VCBN, KVC, topbit( REM_S[ lvl ] ^ COL_VEC ) );
     if( KVN < 0 or KVC - KVN < lvl + 2 ) goto ReInit; // continue;
                             // ^^^^^^^!!
     set_vec( which_col[threadIdx.y], col_vecs[threadIdx.y], COL_VEC, lvl + 3 );
                                                                   // ^^^^^^^!!
     if( lvl > 0 ) {

        REM_S[ lvl - 1 ] = REM_S[ lvl ] ^ COL_VEC;
        VCB_S[ lvl - 1 ] = VCBN;
        NVC_S[ lvl - 1 ] = KVC;
        NVN_S[ lvl - 1 ] = KVN;
        VXB_S[ lvl - 1 ] = VXBN;
        NVX_S[ lvl - 1 ] = KVX;
        SINGLE_S[ lvl - 1 ] = SINGLE_S[ lvl ] || ( rev_max_c == COL_VEC );

        lvl --;
        goto Init;

     } else {  // 48 / 59
        LastCols( REM_S[ lvl ] ^ COL_VEC, VCBN, KVC, KVN,
          VXBN, KVX, SINGLE_S[ lvl ] || ( rev_max_c == COL_VEC ), sub_count );
    }
} // Scope limit for locals.

  ReInit:
    IVC_S[ lvl ] ++;
    goto Loop;
}
#endif // N > 3

__device__ void LastCols( u64 rem, 
       u64* const & vcb, const int & nvc, const int & nvn, 
       u64* const & vxb, const int & nvx, int single, int & sub_count )
{
   __shared__ int c2_s[ NW ];
   #define C2 c2_s[ threadIdx.y ]

  for( C2 = 0; C2 < nvn; C2 ++ ) {
    u64 v2 = vcb[ C2 ];
    set_vec( which_col[threadIdx.y], col_vecs[threadIdx.y], v2, 2 );
    int single2 = single or ( rev_max_c == v2 );
    int nvn1 = cnext( vcb + nvn, nvc - nvn, topbit( rem ^ v2 ) ); // 2 / 51
    for( int c1 = 0; c1 < nvn1; c1 ++ ) {
      u64 v1 = vcb[ nvn + c1 ];
      if( ! ( v2 & v1 ) ) {
        u64 v0 = rem ^ v1 ^ v2;
        if( ( ! ( v0 & 1 ) ) or v_max_c >= Reverse( v0 ) ) {
          // 1.5 / 51
          set_vec( which_col[threadIdx.y], col_vecs[threadIdx.y], v1, 1 );
          set_vec( which_col[threadIdx.y], col_vecs[threadIdx.y], v0, 0 );
          u64* vxbn = RUWS( nvx ) + vxb;
          int kvx = gather_double_cross( vxb, nvx, v2, v1, vxbn ); // 6 / 51
          int shift =
               ( ( single2 || rev_max_c == v1 || rev_max_c == v0 ) ? 0 : 1 );
          // avr( kvx ) : 8.6,  27% : > 10,  0.5% : > 20,  0.0005% : > 30
          // 25 / 59
          while( kvx > MDIAG ) {
            sub_count += MakeDiagS( vxbn, kvx ) << shift;
            vxbn ++;
            kvx --;
          }
          sub_count += MakeDiagC( vxbn, kvx ) << shift;
        }
      }
    }
  }
  return;
}

__device__ int MakeDiagS( u64* const & vxb, const int & nvx ) 
{
   int  diag_count = 0;

   u64 vdx = *vxb;
   for( int ic = 1; ic < nvx; ic += WS ) {
      u64 vcx = -1ULL;
      if( ic + threadIdx.x < nvx ) vcx = vxb[ ic + threadIdx.x ];
#if N%2
      if( __popcll( vdx & vcx ) == 1 ) 
#else
      if( ( vdx & vcx ) == 0 ) 
#endif
      {
        diag_count +=    // 18 / 59
          FinalCheck( which_rowv[ threadIdx.y ], which_col[ threadIdx.y ],
             col_vecs[ threadIdx.y ], vdx, vcx );
      }
   }
   return diag_count;
}

__device__ int MakeDiagC( u64* const & vx,  const int & vxn ) 
{
   int  diag_count = 0;

   for( int ivx = p_offset_c[ vxn ]; ivx < p_offset_c[ vxn + 1 ]; ivx += WS ) {
      if( ivx + threadIdx.x < p_offset_c[ vxn + 1 ] ) {
         int idx  = p_idx_c[ ivx + threadIdx.x ];
         u64 vdx = vx[ idx >> 16 ];
         u64 vcx = vx[ idx & 0xffff ];
#if N%2
         if( __popcll( vdx & vcx ) == 1 ) 
#else
         if( ( vdx & vcx ) == 0 ) 
#endif
         {
            diag_count +=    // 18 / 59
              FinalCheck( which_rowv[ threadIdx.y ], which_col[ threadIdx.y ],
              col_vecs[ threadIdx.y ], vdx, vcx );
         }
      }
   }
   return diag_count;
}

__device__ int FinalCheck( 
    u64* const &e2rowv, int* const &e2col, u64* const &col_v, 
    const u64 & vdx, const u64 & vcx )
{
   int i;
   i = e2col[ __clzll( vdx & e2rowv[ __clzll( vcx & col_v[ 0 ] ) 
                                                 + NN-64 ] ) + NN-64 ];
   if( e2col[ __clzll( vcx & e2rowv[ __clzll( vdx & col_v[ 0 ] ) 
                                                 + NN-64 ] ) + NN-64 ] 
       != i ) return 0;

   i = ( i & 1 ) + 1; 

   return ( e2col[ __clzll( vdx & e2rowv[ __clzll( vcx & col_v[ i ] ) 
                                                 + NN-64 ] ) + NN-64 ] 
            ==
            e2col[ __clzll( vcx & e2rowv[ __clzll( vdx & col_v[ i ] ) 
                                                 + NN-64 ] ) + NN-64 ] 
          ) ? 1 : 0;
}

int main( int argc, char* argv[] )
{
   fprintf( stderr, "%s\n", __FILE__ );
   fprintf( stderr, "Size of long long unsigned : %lu \n", sizeof( u64 ) );
   if( sizeof( u64 ) * 8 < NN ) {
      fprintf( stderr, 
               "Size of long long is too small : %lu \n", sizeof( u64 ) );
      exit( 1 );
   }
   if( check_topbit( ) ) {
      fprintf( stderr, "topbit() does't work correctly on this platform.\n" );
      exit( 1 );
   }

   GenVecs( NN, ( ( NN + 1 ) * N ) / 2, N - 1, 0ULL );
   fprintf( stderr, "nvecs %d\n", nvecs );

   /* pair indexes ----------------------------------- */
 
   int p_offset[ MDIAG + 2 ];
   int p_idx[ MDPAIR ];
 
   int ioff = 0;
   for( int ndiag = 0; ndiag < MDIAG + 1; ndiag ++ ) {
 
      p_offset[ ndiag ] = ioff;
      for( int idx = 0; idx < ndiag - 1; idx ++ ) {
         for( int icx = idx + 1; icx < ndiag; icx ++ ) {
             p_idx[ ioff ++ ] = ( idx << 16 ) | icx;
         }
      }
   }
   p_offset[ MDIAG + 1 ] = ioff;
 
   fprintf( stderr, "size of p_idx_c %d \n", ioff );
   if( ioff >= MDPAIR ) {
     fprintf(stderr, "p_idx_c index out of ragne. %d >= %d\n", ioff, MDPAIR );
     exit( 1 );
   }
   /* ------------------------------------------------ */
   // Get device properties
   // Set a part of constant memory
   //
   int ndev;
   CU_SAFE( cudaGetDeviceCount( &ndev ) );
   vector<int> dev_blocks( ndev );
   for( int idev = 0 ; idev < ndev; idev ++ ) {
     CU_SAFE( cudaSetDevice( idev ) );
     cudaDeviceProp prop;
     CU_SAFE( cudaGetDeviceProperties( &prop, idev ) );
     int nblocks = prop.multiProcessorCount * NB_SM;
     dev_blocks[ idev ] = nblocks;
     fprintf( stderr, "DevId:%2d  #SM:%d, #Blocks:%d %s\n", 
                      idev, prop.multiProcessorCount, nblocks, prop.name);
     CU_SAFE( cudaMemcpyToSymbol( 
             p_offset_c, p_offset, sizeof( int ) * ( MDIAG + 2 ) ) );
     CU_SAFE( cudaMemcpyToSymbol( p_idx_c, p_idx, sizeof( int ) * ioff ) );
   }

   // 
   u64 row1P = strtoll( argv[ 2 ], NULL, 16 );
   u64 row2P = strtoll( argv[ 4 ], NULL, 16 );
   fprintf( stderr, "r1:%09llx r2:%09llx\n", row1P, row2P );

   u64 total_count = 0ULL;

   for( int max_row = 0; max_row < nvecs; ++ max_row ) {
     u64 max_rowP = vecs[ max_row ];
     if( row1P != 0ULL and row1P < max_rowP ) continue;
     if( max_rowP < row1P ) break;
     if( ! ( max_rowP & 1ULL << ( NN - 1 ) ) ) break;
     if( max_rowP < Reverse( max_rowP ) ) continue;
     for( int second_row = max_row + 1; second_row < nvecs; ++ second_row ) {
         u64 second_rowP = vecs[ second_row ];
         if( row2P != 0ULL and row2P < second_rowP ) continue;
         if( second_rowP < row2P ) break;
         if( max_rowP & second_rowP ) continue;
         if( max_rowP < Reverse( second_rowP ) ) continue;
         u64 rem = AllBits ^ max_rowP ^ second_rowP;
         if( rem > second_rowP ) break;

         count_m = 0ULL;
         Count( max_row, second_row, dev_blocks );

         total_count += count_m;

         printf( "%05d %09llx ", max_row, vecs[ max_row ] );
         printf( "%05d %09llx ", second_row, vecs[ second_row ] );
         printf( "%15llu ", count_m ); 

         #ifndef noMD5

            MD5_CTX md5ctx;
            unsigned char md5bin[ MD5_DIGEST_LENGTH ];
            char md5str[ MD5_DIGEST_LENGTH * 2 + 1 ];

            const char* sample = "e00000007 1c0000038    494199069345";
            int msg_len = strlen( sample );
            char msg[ msg_len + 1 ];
            sprintf( msg, "%09llx %09llx %15llu", 
                       vecs[ max_row ], vecs[ second_row ], count_m );
         
            MD5_Init( &md5ctx );
            MD5_Update( &md5ctx, msg, msg_len );
            MD5_Final( md5bin, &md5ctx );

            for( int i = 0; i < MD5_DIGEST_LENGTH; i ++ )
              sprintf( md5str + ( i * 2 ), "%02x", md5bin[ i ] );
            md5str[ MD5_DIGEST_LENGTH * 2 ] = 0;

            printf( "%s", md5str );

         #endif

         printf( "\n");
     }
   }
   if( row2P == 0ULL ) fprintf( stderr, "Total: %17llu\n", total_count );

   return 0;
}
</file>