4f1c674ee0
http://crd.lbl.gov/~xiaoye/SuperLU/ This is a library to solve sparse matrix systems (type A*x=B). It is able to solve large systems very FAST. Only the necessary parts of the library are included to limit file size and compilation time. This means the example files, fortran interface, test files, matlab interface, cblas library, complex number part and build system have been left out. All (gcc) warnings have been fixed too. This library will be used for LSCM UV unwrapping. With this library, LSCM unwrapping can be calculated in a split second, making the unwrapping proces much more interactive. Added OpenNL (Open Numerical Libary): http://www.loria.fr/~levy/OpenNL/ OpenNL is a library to easily construct and solve sparse linear systems. We use a stripped down version, as an interface to SuperLU. This library was kindly given to use by Bruno Levy.
118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
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/*
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* -- SuperLU routine (version 3.0) --
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* Univ. of California Berkeley, Xerox Palo Alto Research Center,
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* and Lawrence Berkeley National Lab.
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* October 15, 2003
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*
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*/
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/*
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Copyright (c) 1994 by Xerox Corporation. All rights reserved.
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THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY
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EXPRESSED OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
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Permission is hereby granted to use or copy this program for any
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purpose, provided the above notices are retained on all copies.
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Permission to modify the code and to distribute modified code is
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granted, provided the above notices are retained, and a notice that
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the code was modified is included with the above copyright notice.
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*/
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#include "ssp_defs.h"
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void slsolve(int, int, float*, float*);
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void smatvec(int, int, int, float*, float*, float*);
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/*
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* Performs numeric block updates within the relaxed snode.
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*/
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int
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ssnode_bmod (
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const int jcol, /* in */
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const int fsupc, /* in */
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float *dense, /* in */
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float *tempv, /* working array */
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GlobalLU_t *Glu, /* modified */
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SuperLUStat_t *stat /* output */
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)
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{
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#ifdef USE_VENDOR_BLAS
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#ifdef _CRAY
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_fcd ftcs1 = _cptofcd("L", strlen("L")),
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ftcs2 = _cptofcd("N", strlen("N")),
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ftcs3 = _cptofcd("U", strlen("U"));
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#endif
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int incx = 1, incy = 1;
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float alpha = -1.0, beta = 1.0;
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#endif
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int luptr, nsupc, nsupr, nrow;
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int isub, irow, i, iptr;
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register int ufirst, nextlu;
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int *lsub, *xlsub;
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float *lusup;
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int *xlusup;
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flops_t *ops = stat->ops;
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lsub = Glu->lsub;
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xlsub = Glu->xlsub;
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lusup = Glu->lusup;
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xlusup = Glu->xlusup;
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nextlu = xlusup[jcol];
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/*
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* Process the supernodal portion of L\U[*,j]
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*/
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for (isub = xlsub[fsupc]; isub < xlsub[fsupc+1]; isub++) {
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irow = lsub[isub];
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lusup[nextlu] = dense[irow];
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dense[irow] = 0;
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++nextlu;
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}
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xlusup[jcol + 1] = nextlu; /* Initialize xlusup for next column */
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if ( fsupc < jcol ) {
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luptr = xlusup[fsupc];
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nsupr = xlsub[fsupc+1] - xlsub[fsupc];
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nsupc = jcol - fsupc; /* Excluding jcol */
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ufirst = xlusup[jcol]; /* Points to the beginning of column
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jcol in supernode L\U(jsupno). */
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nrow = nsupr - nsupc;
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ops[TRSV] += nsupc * (nsupc - 1);
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ops[GEMV] += 2 * nrow * nsupc;
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#ifdef USE_VENDOR_BLAS
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#ifdef _CRAY
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STRSV( ftcs1, ftcs2, ftcs3, &nsupc, &lusup[luptr], &nsupr,
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&lusup[ufirst], &incx );
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SGEMV( ftcs2, &nrow, &nsupc, &alpha, &lusup[luptr+nsupc], &nsupr,
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&lusup[ufirst], &incx, &beta, &lusup[ufirst+nsupc], &incy );
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#else
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strsv_( "L", "N", "U", &nsupc, &lusup[luptr], &nsupr,
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&lusup[ufirst], &incx );
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sgemv_( "N", &nrow, &nsupc, &alpha, &lusup[luptr+nsupc], &nsupr,
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&lusup[ufirst], &incx, &beta, &lusup[ufirst+nsupc], &incy );
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#endif
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#else
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slsolve ( nsupr, nsupc, &lusup[luptr], &lusup[ufirst] );
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smatvec ( nsupr, nrow, nsupc, &lusup[luptr+nsupc],
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&lusup[ufirst], &tempv[0] );
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/* Scatter tempv[*] into lusup[*] */
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iptr = ufirst + nsupc;
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for (i = 0; i < nrow; i++) {
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lusup[iptr++] -= tempv[i];
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tempv[i] = 0.0;
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}
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#endif
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}
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return 0;
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}
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