lapacke_cgesdd.c

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* Contents: Native high-level C interface to LAPACK function cgesdd
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_cgesdd( int matrix_layout, char jobz, lapack_int m,
                           lapack_int n, lapack_complex_float* a,
                           lapack_int lda, float* s, lapack_complex_float* u,
                           lapack_int ldu, lapack_complex_float* vt,
                           lapack_int ldvt )
{
    lapack_int info = 0;
    lapack_int lwork = -1;
    /* Additional scalars declarations for work arrays */
    size_t lrwork;
    lapack_int* iwork = NULL;
    float* rwork = NULL;
    lapack_complex_float* work = NULL;
    lapack_complex_float work_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_cgesdd", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_cge_nancheck( matrix_layout, m, n, a, lda ) ) {
            return -5;
        }
    }
#endif
    /* Additional scalars initializations for work arrays */
    if( LAPACKE_lsame( jobz, 'n' ) ) {
        lrwork = MAX(1,7*MIN(m,n));
    } else {
        lrwork = (size_t)MAX(1,MIN(m,n)*MAX(5*MIN(m,n)+7,2*MAX(m,n)+2*MIN(m,n)+1));
    }
    /* Allocate memory for working array(s) */
    iwork = (lapack_int*)
        LAPACKE_malloc( sizeof(lapack_int) * MAX(1,8*MIN(m,n)) );
    if( iwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    rwork = (float*)LAPACKE_malloc( sizeof(float) * lrwork );
    if( rwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    /* Query optimal working array(s) size */
    info = LAPACKE_cgesdd_work( matrix_layout, jobz, m, n, a, lda, s, u, ldu, vt,
                                ldvt, &work_query, lwork, rwork, iwork );
    if( info != 0 ) {
        goto exit_level_2;
    }
    lwork = LAPACK_C2INT( work_query );
    /* Allocate memory for work arrays */
    work = (lapack_complex_float*)
        LAPACKE_malloc( sizeof(lapack_complex_float) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_2;
    }
    /* Call middle-level interface */
    info = LAPACKE_cgesdd_work( matrix_layout, jobz, m, n, a, lda, s, u, ldu, vt,
                                ldvt, work, lwork, rwork, iwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_2:
    LAPACKE_free( rwork );
exit_level_1:
    LAPACKE_free( iwork );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_cgesdd", info );
    }
    return info;
}