lapacke_sgebal_work.c

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* Contents: Native middle-level C interface to LAPACK function sgebal
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_sgebal_work( int matrix_layout, char job, lapack_int n,
                                float* a, lapack_int lda, lapack_int* ilo,
                                lapack_int* ihi, float* scale )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_sgebal( &job, &n, a, &lda, ilo, ihi, scale, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int lda_t = MAX(1,n);
        float* a_t = NULL;
        /* Check leading dimension(s) */
        if( lda < n ) {
            info = -5;
            LAPACKE_xerbla( "LAPACKE_sgebal_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'p' ) ||
            LAPACKE_lsame( job, '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;
            }
        }
        /* Transpose input matrices */
        if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'p' ) ||
            LAPACKE_lsame( job, 's' ) ) {
            LAPACKE_sge_trans( matrix_layout, n, n, a, lda, a_t, lda_t );
        }
        /* Call LAPACK function and adjust info */
        LAPACK_sgebal( &job, &n, a_t, &lda_t, ilo, ihi, scale, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'p' ) ||
            LAPACKE_lsame( job, 's' ) ) {
            LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, n, a_t, lda_t, a, lda );
        }
        /* Release memory and exit */
        if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'p' ) ||
            LAPACKE_lsame( job, 's' ) ) {
            LAPACKE_free( a_t );
        }
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_sgebal_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_sgebal_work", info );
    }
    return info;
}