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*****************************************************************************
* Contents: Native high-level C interface to LAPACK function zlarfb
* Author: Intel Corporation
*****************************************************************************/

#include "lapacke_utils.h"

lapack_int LAPACKE_zlarfb( int matrix_layout, char side, char trans, char direct,
                           char storev, lapack_int m, lapack_int n,
                           lapack_int k, const lapack_complex_double* v,
                           lapack_int ldv, const lapack_complex_double* t,
                           lapack_int ldt, lapack_complex_double* c,
                           lapack_int ldc )
{
    lapack_int info = 0;
    lapack_int ldwork;
    lapack_complex_double* work = NULL;
    lapack_int ncols_v, nrows_v;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_zlarfb", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        lapack_int lrv, lcv;  /* row, column stride */
        if( matrix_layout == LAPACK_COL_MAJOR ) {
            lrv = 1;
            lcv = ldv;
        } else {
            lrv = ldv;
            lcv = 1;
        }
        ncols_v =     LAPACKE_lsame( storev, 'c' ) ? k :
                  ( ( LAPACKE_lsame( storev, 'r' ) && LAPACKE_lsame( side, 'l' ) ) ? m :
                  ( ( LAPACKE_lsame( storev, 'r' ) && LAPACKE_lsame( side, 'r' ) ) ? n : 1) );

        nrows_v =   ( LAPACKE_lsame( storev, 'c' ) && LAPACKE_lsame( side, 'l' ) ) ? m :
                  ( ( LAPACKE_lsame( storev, 'c' ) && LAPACKE_lsame( side, 'r' ) ) ? n :
                    ( LAPACKE_lsame( storev, 'r' ) ? k : 1) );
        if( LAPACKE_zge_nancheck( matrix_layout, m, n, c, ldc ) ) {
            return -13;
        }
        if( LAPACKE_zge_nancheck( matrix_layout, k, k, t, ldt ) ) {
            return -11;
        }
        if( LAPACKE_lsame( storev, 'c' ) && LAPACKE_lsame( direct, 'f' ) ) {
            if( LAPACKE_ztr_nancheck( matrix_layout, 'l', 'u', k, v, ldv ) )
                return -9;
            if( LAPACKE_zge_nancheck( matrix_layout, nrows_v-k, ncols_v,
                                      &v[k*lrv], ldv ) )
                return -9;
        } else if( LAPACKE_lsame( storev, 'c' ) && LAPACKE_lsame( direct, 'b' ) ) {
            if( k > nrows_v ) {
                LAPACKE_xerbla( "LAPACKE_zlarfb", -8 );
                return -8;
            }
            if( LAPACKE_ztr_nancheck( matrix_layout, 'u', 'u', k,
                                      &v[(nrows_v-k)*lrv], ldv ) )
                return -9;
            if( LAPACKE_zge_nancheck( matrix_layout, nrows_v-k, ncols_v, v, ldv ) )
                return -9;
        } else if( LAPACKE_lsame( storev, 'r' ) && LAPACKE_lsame( direct, 'f' ) ) {
            if( LAPACKE_ztr_nancheck( matrix_layout, 'u', 'u', k, v, ldv ) )
                return -9;
            if( LAPACKE_zge_nancheck( matrix_layout, nrows_v, ncols_v-k,
                                      &v[k*lrv], ldv ) )
                return -9;
        } else if( LAPACKE_lsame( storev, 'r' ) && LAPACKE_lsame( direct, 'b' ) ) {
            if( k > ncols_v ) {
                LAPACKE_xerbla( "LAPACKE_zlarfb", -8 );
                return -8;
            }
            if( LAPACKE_ztr_nancheck( matrix_layout, 'l', 'u', k,
                                      &v[(ncols_v-k)*lcv], ldv ) )
                return -9;
            if( LAPACKE_zge_nancheck( matrix_layout, nrows_v, ncols_v-k, v, ldv ) )
                return -9;
        }
    }
#endif
    if( LAPACKE_lsame( side, 'l' ) ) {
        ldwork = n;
    } else if( LAPACKE_lsame( side, 'r' ) ) {
        ldwork = m;
    } else {
        ldwork = 1;
    }
    /* Allocate memory for working array(s) */
    work = (lapack_complex_double*)
        LAPACKE_malloc( sizeof(lapack_complex_double) * ldwork * MAX(1,k) );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    /* Call middle-level interface */
    info = LAPACKE_zlarfb_work( matrix_layout, side, trans, direct, storev, m, n,
                                k, v, ldv, t, ldt, c, ldc, work, ldwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_zlarfb", info );
    }
    return info;
}
