lapacke_cgesvd_work.c File Reference

#include "lapacke_utils.h"

Go to the source code of this file.

Functions
lapack_int	LAPACKE_cgesvd_work (int matrix_layout, char jobu, char jobvt, 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_complex_float *work, lapack_int lwork, float *rwork)

Function Documentation

LAPACKE_cgesvd_work()

lapack_int LAPACKE_cgesvd_work	(	int	matrix_layout,
		char	jobu,
		char	jobvt,
		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_complex_float *	work,
		lapack_int	lwork,
		float *	rwork )

Definition at line 35 of file lapacke_cgesvd_work.c.

{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_cgesvd( &jobu, &jobvt, &m, &n, a, &lda, s, u, &ldu, vt, &ldvt,
                       work, &lwork, rwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int nrows_u = ( LAPACKE_lsame( jobu, 'a' ) ||
                             LAPACKE_lsame( jobu, 's' ) ) ? m : 1;
        lapack_int ncols_u = LAPACKE_lsame( jobu, 'a' ) ? m :
                             ( LAPACKE_lsame( jobu, 's' ) ? MIN(m,n) : 1);
        lapack_int nrows_vt = LAPACKE_lsame( jobvt, 'a' ) ? n :
                              ( LAPACKE_lsame( jobvt, 's' ) ? MIN(m,n) : 1);
        lapack_int ncols_vt = ( LAPACKE_lsame( jobvt, 'a' ) ||
                               LAPACKE_lsame( jobvt, 's' ) ) ? n : 1;
        lapack_int lda_t = MAX(1,m);
        lapack_int ldu_t = MAX(1,nrows_u);
        lapack_int ldvt_t = MAX(1,nrows_vt);
        lapack_complex_float* a_t = NULL;
        lapack_complex_float* u_t = NULL;
        lapack_complex_float* vt_t = NULL;
        /* Check leading dimension(s) */
        if( lda < n ) {
            info = -7;
            LAPACKE_xerbla( "LAPACKE_cgesvd_work", info );
            return info;
        }
        if( ldu < ncols_u ) {
            info = -10;
            LAPACKE_xerbla( "LAPACKE_cgesvd_work", info );
            return info;
        }
        if( ldvt < ncols_vt ) {
            info = -12;
            LAPACKE_xerbla( "LAPACKE_cgesvd_work", info );
            return info;
        }
        /* Query optimal working array(s) size if requested */
        if( lwork == -1 ) {
            LAPACK_cgesvd( &jobu, &jobvt, &m, &n, a, &lda_t, s, u, &ldu_t, vt,
                           &ldvt_t, work, &lwork, rwork, &info );
            return (info < 0) ? (info - 1) : info;
        }
        /* Allocate memory for temporary array(s) */
        a_t = (lapack_complex_float*)
            LAPACKE_malloc( sizeof(lapack_complex_float) * lda_t * MAX(1,n) );
        if( a_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
            u_t = (lapack_complex_float*)
                LAPACKE_malloc( sizeof(lapack_complex_float) *
                                ldu_t * MAX(1,ncols_u) );
            if( u_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_1;
            }
        }
        if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
            vt_t = (lapack_complex_float*)
                LAPACKE_malloc( sizeof(lapack_complex_float) *
                                ldvt_t * MAX(1,n) );
            if( vt_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_2;
            }
        }
        /* Transpose input matrices */
        LAPACKE_cge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
        /* Call LAPACK function and adjust info */
        LAPACK_cgesvd( &jobu, &jobvt, &m, &n, a_t, &lda_t, s, u_t, &ldu_t, vt_t,
                       &ldvt_t, work, &lwork, rwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_cge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
        if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
            LAPACKE_cge_trans( LAPACK_COL_MAJOR, nrows_u, ncols_u, u_t, ldu_t,
                               u, ldu );
        }
        if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
            LAPACKE_cge_trans( LAPACK_COL_MAJOR, nrows_vt, n, vt_t, ldvt_t, vt,
                               ldvt );
        }
        /* Release memory and exit */
        if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
            LAPACKE_free( vt_t );
        }
exit_level_2:
        if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
            LAPACKE_free( u_t );
        }
exit_level_1:
        LAPACKE_free( a_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_cgesvd_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_cgesvd_work", info );
    }
    return info;
}