lapacke_sgges3_work.c

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* Contents: Native middle-level C interface to LAPACK function sgges3
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_sgges3_work( int matrix_layout, char jobvsl, char jobvsr,
                                char sort, LAPACK_S_SELECT3 selctg,
                                lapack_int n, float* a, lapack_int lda,
                                float* b, lapack_int ldb, lapack_int* sdim,
                                float* alphar, float* alphai, float* beta,
                                float* vsl, lapack_int ldvsl,
                                float* vsr, lapack_int ldvsr,
                                float* work, lapack_int lwork,
                                lapack_logical* bwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_sgges3( &jobvsl, &jobvsr, &sort, selctg, &n, a, &lda, b, &ldb,
                       sdim, alphar, alphai, beta, vsl, &ldvsl, vsr, &ldvsr,
                       work, &lwork, bwork, &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 ldvsl_t = MAX(1,n);
        lapack_int ldvsr_t = MAX(1,n);
        float* a_t = NULL;
        float* b_t = NULL;
        float* vsl_t = NULL;
        float* vsr_t = NULL;
        /* Check leading dimension(s) */
        if( lda < n ) {
            info = -8;
            LAPACKE_xerbla( "LAPACKE_sgges3_work", info );
            return info;
        }
        if( ldb < n ) {
            info = -10;
            LAPACKE_xerbla( "LAPACKE_sgges3_work", info );
            return info;
        }
        if( ldvsl < n ) {
            info = -16;
            LAPACKE_xerbla( "LAPACKE_sgges3_work", info );
            return info;
        }
        if( ldvsr < n ) {
            info = -18;
            LAPACKE_xerbla( "LAPACKE_sgges3_work", info );
            return info;
        }
        /* Query optimal working array(s) size if requested */
        if( lwork == -1 ) {
            LAPACK_sgges3( &jobvsl, &jobvsr, &sort, selctg, &n, a, &lda_t, b,
                           &ldb_t, sdim, alphar, alphai, beta, vsl, &ldvsl_t,
                           vsr, &ldvsr_t, work, &lwork, bwork, &info );
            return (info < 0) ? (info - 1) : info;
        }
        /* Allocate memory for temporary array(s) */
        a_t = (float*)LAPACKE_malloc( sizeof(float) * lda_t * MAX(1,n) );
        if( a_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        b_t = (float*)LAPACKE_malloc( sizeof(float) * ldb_t * MAX(1,n) );
        if( b_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        if( LAPACKE_lsame( jobvsl, 'v' ) ) {
            vsl_t = (float*)
                LAPACKE_malloc( sizeof(float) * ldvsl_t * MAX(1,n) );
            if( vsl_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_2;
            }
        }
        if( LAPACKE_lsame( jobvsr, 'v' ) ) {
            vsr_t = (float*)
                LAPACKE_malloc( sizeof(float) * ldvsr_t * MAX(1,n) );
            if( vsr_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_3;
            }
        }
        /* Transpose input matrices */
        LAPACKE_sge_trans( matrix_layout, n, n, a, lda, a_t, lda_t );
        LAPACKE_sge_trans( matrix_layout, n, n, b, ldb, b_t, ldb_t );
        /* Call LAPACK function and adjust info */
        LAPACK_sgges3( &jobvsl, &jobvsr, &sort, selctg, &n, a_t, &lda_t, b_t,
                       &ldb_t, sdim, alphar, alphai, beta, vsl_t, &ldvsl_t,
                       vsr_t, &ldvsr_t, work, &lwork, bwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, n, a_t, lda_t, a, lda );
        LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, n, b_t, ldb_t, b, ldb );
        if( LAPACKE_lsame( jobvsl, 'v' ) ) {
            LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, n, vsl_t, ldvsl_t, vsl,
                               ldvsl );
        }
        if( LAPACKE_lsame( jobvsr, 'v' ) ) {
            LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, n, vsr_t, ldvsr_t, vsr,
                               ldvsr );
        }
        /* Release memory and exit */
        if( LAPACKE_lsame( jobvsr, 'v' ) ) {
            LAPACKE_free( vsr_t );
        }
exit_level_3:
        if( LAPACKE_lsame( jobvsl, 'v' ) ) {
            LAPACKE_free( vsl_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_sgges3_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_sgges3_work", info );
    }
    return info;
}