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# mops.h

    00001 //
    00002 // mops.h --- block matrix operations
    00003 //
    00004 // Copyright (C) 1997 Limit Point Systems, Inc.
    00005 //
    00006 // Author: Edward Seidl <seidl@janed.com>
    00007 // Maintainer: LPS
    00008 //
    00009 // This file is part of the SC Toolkit.
    00010 //
    00011 // The SC Toolkit is free software; you can redistribute it and/or modify
    00012 // it under the terms of the GNU Library General Public License as published by
    00013 // the Free Software Foundation; either version 2, or (at your option)
    00014 // any later version.
    00015 //
    00016 // The SC Toolkit is distributed in the hope that it will be useful,
    00017 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00018 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00019 // GNU Library General Public License for more details.
    00020 //
    00021 // You should have received a copy of the GNU Library General Public License
    00022 // along with the SC Toolkit; see the file COPYING.LIB.  If not, write to
    00023 // the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
    00024 //
    00025 // The U.S. Government is granted a limited license as per AL 91-7.
    00026 //
    00027
    00028 #ifndef _math_scmat_mops_h
    00029 #define _math_scmat_mops_h
    00030
    00031 #define D1 32
    00032
    00033 // copy a chunk of rectangular matrix source into dest.  dest is D1xD1, and is
    00034 // padded with zeros
    00035
    00036 static inline void
    00037 copy_block(double **dest, double **source,
    00038            int istart, int ni, int jstart, int nj)
    00039 {
    00040   int ii,jj;
    00041
    00042   for (ii=0; ii < ni; ii++) {
    00043     double *di = dest[ii];
    00044     double *si = &source[istart+ii][jstart];
    00045     for (jj=0; jj < nj; jj++)
    00046       di[jj] = si[jj];
    00047     for (; jj < D1; jj++)
    00048       di[jj] = 0;
    00049   }
    00050
    00051   int left=D1-ii;
    00052   if (left)
    00053     memset(dest[ii], 0, sizeof(double)*left*D1);
    00054 }
    00055
    00056 static inline void
    00057 copy_trans_block(double **dest, double **source,
    00058                  int istart, int ni, int jstart, int nj)
    00059 {
    00060   int ii,jj;
    00061
    00062   memset(dest[0], 0, sizeof(double)*D1*D1);
    00063
    00064   for (jj=0; jj < nj; jj++) {
    00065     double *sj = &source[jstart+jj][istart];
    00066     for (ii=0; ii < ni; ii++)
    00067       dest[ii][jj] = sj[ii];
    00068   }
    00069 }
    00070
    00071 // copy a chunk of symmetric matrix source into dest.  dest is D1xD1, and is
    00072 // padded with zeros
    00073 static inline void
    00074 copy_sym_block(double **dest, double **source,
    00075                int istart, int ni, int jstart, int nj)
    00076 {
    00077   int ii,jj;
    00078
    00079   for (ii=0; ii < ni; ii++) {
    00080     double *di = dest[ii];
    00081     double *si = &source[istart+ii][jstart];
    00082
    00083     if (jstart < istart)
    00084       for (jj=0; jj < nj; jj++)
    00085         di[jj] = si[jj];
    00086     else if (jstart==istart)
    00087       for (jj=0; jj <= ii; jj++)
    00088         di[jj] = dest[jj][ii] = si[jj];
    00089     else
    00090       for (jj=0; jj < nj; jj++)
    00091         di[jj] = source[jstart+jj][istart+ii];
    00092
    00093     for (jj=nj; jj < D1; jj++)
    00094       di[jj] = 0;
    00095   }
    00096
    00097   int left=D1-ii;
    00098   if (left)
    00099     memset(dest[ii], 0, sizeof(double)*left*D1);
    00100 }
    00101
    00102 static inline void
    00103 return_block(double **dest, double **source,
    00104              int istart, int ni, int jstart, int nj)
    00105 {
    00106   int ii,jj;
    00107
    00108   for (ii=0; ii < ni; ii++)
    00109     for (jj=0; jj < nj; jj++)
    00110       dest[istart+ii][jstart+jj] = source[ii][jj];
    00111 }
    00112
    00113 // a, b, and c are all D1xD1 blocks
    00114 static inline void
    00115 mult_block(double **a, double **b, double **c, int ni, int nj, int nk)
    00116 {
    00117   int ii,jj,kk;
    00118   double t00,t10,t20,t30;
    00119   double *a0, *a1, *a2, *a3;
    00120   double *c0, *c1, *c2, *c3;
    00121
    00122   for (ii=0; ii < ni; ii += 4) {
    00123     a0=a[ii]; a1=a[ii+1]; a2=a[ii+2]; a3=a[ii+3];
    00124     c0=c[ii]; c1=c[ii+1]; c2=c[ii+2]; c3=c[ii+3];
    00125
    00126     for (jj=0; jj < nj; jj++) {
    00127       double *bt = b[jj];
    00128       t00=c0[jj]; t10=c1[jj]; t20=c2[jj]; t30=c3[jj];
    00129
    00130       for (kk=0; kk < nk; kk += 2) {
    00131         register double b0=bt[kk], b1=bt[kk+1];
    00132         t00 += a0[kk]*b0 + a0[kk+1]*b1;
    00133         t10 += a1[kk]*b0 + a1[kk+1]*b1;
    00134         t20 += a2[kk]*b0 + a2[kk+1]*b1;
    00135         t30 += a3[kk]*b0 + a3[kk+1]*b1;
    00136       }
    00137
    00138       c0[jj]=t00;
    00139       c1[jj]=t10;
    00140       c2[jj]=t20;
    00141       c3[jj]=t30;
    00142     }
    00143   }
    00144 }
    00145
    00146 #endif
    00147
    00148 // Local Variables:
    00149 // mode: c++
    00150 // c-file-style: "ETS"
    00151 // End: