lapacke_sbdsdc_work.c

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* Contents: Native middle-level C interface to LAPACK function sbdsdc
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_sbdsdc_work( int matrix_layout, char uplo, char compq,
                                lapack_int n, float* d, float* e, float* u,
                                lapack_int ldu, float* vt, lapack_int ldvt,
                                float* q, lapack_int* iq, float* work,
                                lapack_int* iwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_sbdsdc( &uplo, &compq, &n, d, e, u, &ldu, vt, &ldvt, q, iq, work,
                       iwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldu_t = MAX(1,n);
        lapack_int ldvt_t = MAX(1,n);
        float* u_t = NULL;
        float* vt_t = NULL;
        /* Check leading dimension(s) */
        if( ldu < n ) {
            info = -8;
            LAPACKE_xerbla( "LAPACKE_sbdsdc_work", info );
            return info;
        }
        if( ldvt < n ) {
            info = -10;
            LAPACKE_xerbla( "LAPACKE_sbdsdc_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        if( LAPACKE_lsame( compq, 'i' ) ) {
            u_t = (float*)LAPACKE_malloc( sizeof(float) * ldu_t * MAX(1,n) );
            if( u_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_0;
            }
        }
        if( LAPACKE_lsame( compq, 'i' ) ) {
            vt_t = (float*)LAPACKE_malloc( sizeof(float) * ldvt_t * MAX(1,n) );
            if( vt_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_1;
            }
        }
        /* Call LAPACK function and adjust info */
        LAPACK_sbdsdc( &uplo, &compq, &n, d, e, u_t, &ldu_t, vt_t, &ldvt_t, q,
                       iq, work, iwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        if( LAPACKE_lsame( compq, 'i' ) ) {
            LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, n, u_t, ldu_t, u, ldu );
        }
        if( LAPACKE_lsame( compq, 'i' ) ) {
            LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, n, vt_t, ldvt_t, vt, ldvt );
        }
        /* Release memory and exit */
        if( LAPACKE_lsame( compq, 'i' ) ) {
            LAPACKE_free( vt_t );
        }
exit_level_1:
        if( LAPACKE_lsame( compq, 'i' ) ) {
            LAPACKE_free( u_t );
        }
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_sbdsdc_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_sbdsdc_work", info );
    }
    return info;
}