lapacke_dtgsna_work.c

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* Contents: Native middle-level C interface to LAPACK function dtgsna
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dtgsna_work( int matrix_layout, char job, char howmny,
                                const lapack_logical* select, lapack_int n,
                                const double* a, lapack_int lda,
                                const double* b, lapack_int ldb,
                                const double* vl, lapack_int ldvl,
                                const double* vr, lapack_int ldvr, double* s,
                                double* dif, lapack_int mm, lapack_int* m,
                                double* work, lapack_int lwork,
                                lapack_int* iwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dtgsna( &job, &howmny, select, &n, a, &lda, b, &ldb, vl, &ldvl,
                       vr, &ldvr, s, dif, &mm, m, work, &lwork, iwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int lda_t = MAX(1,n);
        lapack_int ldb_t = MAX(1,n);
        lapack_int ldvl_t = MAX(1,n);
        lapack_int ldvr_t = MAX(1,n);
        double* a_t = NULL;
        double* b_t = NULL;
        double* vl_t = NULL;
        double* vr_t = NULL;
        /* Check leading dimension(s) */
        if( lda < n ) {
            info = -7;
            LAPACKE_xerbla( "LAPACKE_dtgsna_work", info );
            return info;
        }
        if( ldb < n ) {
            info = -9;
            LAPACKE_xerbla( "LAPACKE_dtgsna_work", info );
            return info;
        }
        if( ldvl < mm ) {
            info = -11;
            LAPACKE_xerbla( "LAPACKE_dtgsna_work", info );
            return info;
        }
        if( ldvr < mm ) {
            info = -13;
            LAPACKE_xerbla( "LAPACKE_dtgsna_work", info );
            return info;
        }
        /* Query optimal working array(s) size if requested */
        if( lwork == -1 ) {
            LAPACK_dtgsna( &job, &howmny, select, &n, a, &lda_t, b, &ldb_t, vl,
                           &ldvl_t, vr, &ldvr_t, s, dif, &mm, m, work, &lwork,
                           iwork, &info );
            return (info < 0) ? (info - 1) : info;
        }
        /* Allocate memory for temporary array(s) */
        a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
        if( a_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        b_t = (double*)LAPACKE_malloc( sizeof(double) * ldb_t * MAX(1,n) );
        if( b_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'e' ) ) {
            vl_t = (double*)
                LAPACKE_malloc( sizeof(double) * ldvl_t * MAX(1,mm) );
            if( vl_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_2;
            }
        }
        if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'e' ) ) {
            vr_t = (double*)
                LAPACKE_malloc( sizeof(double) * ldvr_t * MAX(1,mm) );
            if( vr_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_3;
            }
        }
        /* Transpose input matrices */
        LAPACKE_dge_trans( matrix_layout, n, n, a, lda, a_t, lda_t );
        LAPACKE_dge_trans( matrix_layout, n, n, b, ldb, b_t, ldb_t );
        if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'e' ) ) {
            LAPACKE_dge_trans( matrix_layout, n, mm, vl, ldvl, vl_t, ldvl_t );
        }
        if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'e' ) ) {
            LAPACKE_dge_trans( matrix_layout, n, mm, vr, ldvr, vr_t, ldvr_t );
        }
        /* Call LAPACK function and adjust info */
        LAPACK_dtgsna( &job, &howmny, select, &n, a_t, &lda_t, b_t, &ldb_t,
                       vl_t, &ldvl_t, vr_t, &ldvr_t, s, dif, &mm, m, work,
                       &lwork, iwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Release memory and exit */
        if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'e' ) ) {
            LAPACKE_free( vr_t );
        }
exit_level_3:
        if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'e' ) ) {
            LAPACKE_free( vl_t );
        }
exit_level_2:
        LAPACKE_free( b_t );
exit_level_1:
        LAPACKE_free( a_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_dtgsna_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dtgsna_work", info );
    }
    return info;
}