
/*
 * -- SuperLU routine (version 3.0) --
 * Univ. of California Berkeley, Xerox Palo Alto Research Center,
 * and Lawrence Berkeley National Lab.
 * October 15, 2003
 *
 */
/*
Copyright (c) 2003, The Regents of the University of California, through
Lawrence Berkeley National Laboratory (subject to receipt of any required 
approvals from U.S. Dept. of Energy) 

All rights reserved. 

The source code is distributed under BSD license, see the file License.txt
*/

#include "slu_ddefs.h"
extern void dtrsm_();
extern void dgemm_();

/* 
 * Function prototypes 
 */
void dusolve(int, int, double*, double*);
void dlsolve(int, int, double*, double*);
void dmatvec(int, int, int, double*, double*, double*);


void
dgstrs (trans_t trans, SuperMatrix *L, SuperMatrix *U,
        int *perm_c, int *perm_r, SuperMatrix *B,
        SuperLUStat_t *stat, int *info)
{
/*
 * Purpose
 * =======
 *
 * DGSTRS solves a system of linear equations A*X=B or A'*X=B
 * with A sparse and B dense, using the LU factorization computed by
 * DGSTRF.
 *
 * See supermatrix.h for the definition of 'SuperMatrix' structure.
 *
 * Arguments
 * =========
 *
 * trans   (input) trans_t
 *          Specifies the form of the system of equations:
 *          = NOTRANS: A * X = B  (No transpose)
 *          = TRANS:   A'* X = B  (Transpose)
 *          = CONJ:    A**H * X = B  (Conjugate transpose)
 *
 * L       (input) SuperMatrix*
 *         The factor L from the factorization Pr*A*Pc=L*U as computed by
 *         dgstrf(). Use compressed row subscripts storage for supernodes,
 *         i.e., L has types: Stype = SLU_SC, Dtype = SLU_D, Mtype = SLU_TRLU.
 *
 * U       (input) SuperMatrix*
 *         The factor U from the factorization Pr*A*Pc=L*U as computed by
 *         dgstrf(). Use column-wise storage scheme, i.e., U has types:
 *         Stype = SLU_NC, Dtype = SLU_D, Mtype = SLU_TRU.
 *
 * perm_c  (input) int*, dimension (L->ncol)
 *	   Column permutation vector, which defines the 
 *         permutation matrix Pc; perm_c[i] = j means column i of A is 
 *         in position j in A*Pc.
 *
 * perm_r  (input) int*, dimension (L->nrow)
 *         Row permutation vector, which defines the permutation matrix Pr; 
 *         perm_r[i] = j means row i of A is in position j in Pr*A.
 *
 * B       (input/output) SuperMatrix*
 *         B has types: Stype = SLU_DN, Dtype = SLU_D, Mtype = SLU_GE.
 *         On entry, the right hand side matrix.
 *         On exit, the solution matrix if info = 0;
 *
 * stat     (output) SuperLUStat_t*
 *          Record the statistics on runtime and floating-point operation count.
 *          See util.h for the definition of 'SuperLUStat_t'.
 *
 * info    (output) int*
 * 	   = 0: successful exit
 *	   < 0: if info = -i, the i-th argument had an illegal value
 *
 */
#ifdef _CRAY
    _fcd ftcs1, ftcs2, ftcs3, ftcs4;
#endif
    int      incx = 1, incy = 1;
#ifdef USE_VENDOR_BLAS
    double   alpha = 1.0, beta = 1.0;
    double   *work_col;
#endif
    DNformat *Bstore;
    double   *Bmat;
    SCformat *Lstore;
    NCformat *Ustore;
    double   *Lval, *Uval;
    int      fsupc, nrow, nsupr, nsupc, luptr, istart, irow;
    int      i, j, k, iptr, jcol, n, ldb, nrhs;
    double   *work, *rhs_work, *soln;
    flops_t  solve_ops;
    void dprint_soln();

    /* Test input parameters ... */
    *info = 0;
    Bstore = B->Store;
    ldb = Bstore->lda;
    nrhs = B->ncol;
    if ( trans != NOTRANS && trans != TRANS && trans != CONJ ) *info = -1;
    else if ( L->nrow != L->ncol || L->nrow < 0 ||
	      L->Stype != SLU_SC || L->Dtype != SLU_D || L->Mtype != SLU_TRLU )
	*info = -2;
    else if ( U->nrow != U->ncol || U->nrow < 0 ||
	      U->Stype != SLU_NC || U->Dtype != SLU_D || U->Mtype != SLU_TRU )
	*info = -3;
    else if ( ldb < SUPERLU_MAX(0, L->nrow) ||
	      B->Stype != SLU_DN || B->Dtype != SLU_D || B->Mtype != SLU_GE )
	*info = -6;
    if ( *info ) {
	i = -(*info);
	xerbla_("dgstrs", &i);
	return;
    }

    n = L->nrow;
    work = doubleCalloc(n * nrhs);
    if ( !work ) ABORT("Malloc fails for local work[].");
    soln = doubleMalloc(n);
    if ( !soln ) ABORT("Malloc fails for local soln[].");

    Bmat = Bstore->nzval;
    Lstore = L->Store;
    Lval = Lstore->nzval;
    Ustore = U->Store;
    Uval = Ustore->nzval;
    solve_ops = 0;
    
    if ( trans == NOTRANS ) {
	/* Permute right hand sides to form Pr*B */
	for (i = 0; i < nrhs; i++) {
	    rhs_work = &Bmat[i*ldb];
	    for (k = 0; k < n; k++) soln[perm_r[k]] = rhs_work[k];
	    for (k = 0; k < n; k++) rhs_work[k] = soln[k];
	}
	
	/* Forward solve PLy=Pb. */
	for (k = 0; k <= Lstore->nsuper; k++) {
	    fsupc = L_FST_SUPC(k);
	    istart = L_SUB_START(fsupc);
	    nsupr = L_SUB_START(fsupc+1) - istart;
	    nsupc = L_FST_SUPC(k+1) - fsupc;
	    nrow = nsupr - nsupc;

	    solve_ops += nsupc * (nsupc - 1) * nrhs;
	    solve_ops += 2 * nrow * nsupc * nrhs;
	    
	    if ( nsupc == 1 ) {
		for (j = 0; j < nrhs; j++) {
		    rhs_work = &Bmat[j*ldb];
	    	    luptr = L_NZ_START(fsupc);
		    for (iptr=istart+1; iptr < L_SUB_START(fsupc+1); iptr++){
			irow = L_SUB(iptr);
			++luptr;
			rhs_work[irow] -= rhs_work[fsupc] * Lval[luptr];
		    }
		}
	    } else {
	    	luptr = L_NZ_START(fsupc);
#ifdef USE_VENDOR_BLAS
#ifdef _CRAY
		ftcs1 = _cptofcd("L", strlen("L"));
		ftcs2 = _cptofcd("N", strlen("N"));
		ftcs3 = _cptofcd("U", strlen("U"));
		STRSM( ftcs1, ftcs1, ftcs2, ftcs3, &nsupc, &nrhs, &alpha,
		       &Lval[luptr], &nsupr, &Bmat[fsupc], &ldb);
		
		SGEMM( ftcs2, ftcs2, &nrow, &nrhs, &nsupc, &alpha, 
			&Lval[luptr+nsupc], &nsupr, &Bmat[fsupc], &ldb, 
			&beta, &work[0], &n );
#else
		dtrsm_("L", "L", "N", "U", &nsupc, &nrhs, &alpha,
		       &Lval[luptr], &nsupr, &Bmat[fsupc], &ldb);
		
		dgemm_( "N", "N", &nrow, &nrhs, &nsupc, &alpha, 
			&Lval[luptr+nsupc], &nsupr, &Bmat[fsupc], &ldb, 
			&beta, &work[0], &n );
#endif
		for (j = 0; j < nrhs; j++) {
		    rhs_work = &Bmat[j*ldb];
		    work_col = &work[j*n];
		    iptr = istart + nsupc;
		    for (i = 0; i < nrow; i++) {
			irow = L_SUB(iptr);
			rhs_work[irow] -= work_col[i]; /* Scatter */
			work_col[i] = 0.0;
			iptr++;
		    }
		}
#else		
		for (j = 0; j < nrhs; j++) {
		    rhs_work = &Bmat[j*ldb];
		    dlsolve (nsupr, nsupc, &Lval[luptr], &rhs_work[fsupc]);
		    dmatvec (nsupr, nrow, nsupc, &Lval[luptr+nsupc],
			    &rhs_work[fsupc], &work[0] );

		    iptr = istart + nsupc;
		    for (i = 0; i < nrow; i++) {
			irow = L_SUB(iptr);
			rhs_work[irow] -= work[i];
			work[i] = 0.0;
			iptr++;
		    }
		}
#endif		    
	    } /* else ... */
	} /* for L-solve */

#ifdef DEBUG
  	printf("After L-solve: y=\n");
	dprint_soln(n, nrhs, Bmat);
#endif

	/*
	 * Back solve Ux=y.
	 */
	for (k = Lstore->nsuper; k >= 0; k--) {
	    fsupc = L_FST_SUPC(k);
	    istart = L_SUB_START(fsupc);
	    nsupr = L_SUB_START(fsupc+1) - istart;
	    nsupc = L_FST_SUPC(k+1) - fsupc;
	    luptr = L_NZ_START(fsupc);

	    solve_ops += nsupc * (nsupc + 1) * nrhs;

	    if ( nsupc == 1 ) {
		rhs_work = &Bmat[0];
		for (j = 0; j < nrhs; j++) {
		    rhs_work[fsupc] /= Lval[luptr];
		    rhs_work += ldb;
		}
	    } else {
#ifdef USE_VENDOR_BLAS
#ifdef _CRAY
		ftcs1 = _cptofcd("L", strlen("L"));
		ftcs2 = _cptofcd("U", strlen("U"));
		ftcs3 = _cptofcd("N", strlen("N"));
		STRSM( ftcs1, ftcs2, ftcs3, ftcs3, &nsupc, &nrhs, &alpha,
		       &Lval[luptr], &nsupr, &Bmat[fsupc], &ldb);
#else
		dtrsm_("L", "U", "N", "N", &nsupc, &nrhs, &alpha,
		       &Lval[luptr], &nsupr, &Bmat[fsupc], &ldb);
#endif
#else		
		for (j = 0; j < nrhs; j++)
		    dusolve ( nsupr, nsupc, &Lval[luptr], &Bmat[fsupc+j*ldb] );
#endif		
	    }

	    for (j = 0; j < nrhs; ++j) {
		rhs_work = &Bmat[j*ldb];
		for (jcol = fsupc; jcol < fsupc + nsupc; jcol++) {
		    solve_ops += 2*(U_NZ_START(jcol+1) - U_NZ_START(jcol));
		    for (i = U_NZ_START(jcol); i < U_NZ_START(jcol+1); i++ ){
			irow = U_SUB(i);
			rhs_work[irow] -= rhs_work[jcol] * Uval[i];
		    }
		}
	    }
	    
	} /* for U-solve */

#ifdef DEBUG
  	printf("After U-solve: x=\n");
	dprint_soln(n, nrhs, Bmat);
#endif

	/* Compute the final solution X := Pc*X. */
	for (i = 0; i < nrhs; i++) {
	    rhs_work = &Bmat[i*ldb];
	    for (k = 0; k < n; k++) soln[k] = rhs_work[perm_c[k]];
	    for (k = 0; k < n; k++) rhs_work[k] = soln[k];
	}
	
        stat->ops[SOLVE] = solve_ops;

    } else { /* Solve A'*X=B or CONJ(A)*X=B */
	/* Permute right hand sides to form Pc'*B. */
	for (i = 0; i < nrhs; i++) {
	    rhs_work = &Bmat[i*ldb];
	    for (k = 0; k < n; k++) soln[perm_c[k]] = rhs_work[k];
	    for (k = 0; k < n; k++) rhs_work[k] = soln[k];
	}

	stat->ops[SOLVE] = 0;
	for (k = 0; k < nrhs; ++k) {
	    
	    /* Multiply by inv(U'). */
	    sp_dtrsv("U", "T", "N", L, U, &Bmat[k*ldb], stat, info);
	    
	    /* Multiply by inv(L'). */
	    sp_dtrsv("L", "T", "U", L, U, &Bmat[k*ldb], stat, info);
	    
	}
	/* Compute the final solution X := Pr'*X (=inv(Pr)*X) */
	for (i = 0; i < nrhs; i++) {
	    rhs_work = &Bmat[i*ldb];
	    for (k = 0; k < n; k++) soln[k] = rhs_work[perm_r[k]];
	    for (k = 0; k < n; k++) rhs_work[k] = soln[k];
	}

    }

    SUPERLU_FREE(work);
    SUPERLU_FREE(soln);
}

/*
 * Diagnostic print of the solution vector 
 */
void
dprint_soln(int n, int nrhs, double *soln)
{
    int i;

    for (i = 0; i < n; i++) 
  	printf("\t%d: %.4f\n", i, soln[i]);
}
