lapacke_slarfb.c

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* Contents: Native high-level C interface to LAPACK function slarfb
* Author: Intel Corporation
* Generated November 2015
*****************************************************************************/

#include "lapacke_utils.h"

lapack_int LAPACKE_slarfb( int matrix_layout, char side, char trans, char direct,
                           char storev, lapack_int m, lapack_int n,
                           lapack_int k, const float* v, lapack_int ldv,
                           const float* t, lapack_int ldt, float* c,
                           lapack_int ldc )
{
    lapack_int info = 0;
    lapack_int ldwork = ( side=='l')?n:(( side=='r')?m:1);
    float* work = NULL;
    lapack_int ncols_v, nrows_v;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_slarfb", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    /* Optionally check input matrices for NaNs */
    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_sge_nancheck( matrix_layout, m, n, c, ldc ) ) {
        return -13;
    }
    if( LAPACKE_sge_nancheck( matrix_layout, k, k, t, ldt ) ) {
        return -11;
    }
    if( LAPACKE_lsame( storev, 'c' ) && LAPACKE_lsame( direct, 'f' ) ) {
        if( LAPACKE_str_nancheck( matrix_layout, 'l', 'u', k, v, ldv ) )
            return -9;
        if( LAPACKE_sge_nancheck( matrix_layout, nrows_v-k, ncols_v, &v[k*ldv],
            ldv ) )
            return -9;
    } else if( LAPACKE_lsame( storev, 'c' ) && LAPACKE_lsame( direct, 'b' ) ) {
        if( k > nrows_v ) {
            LAPACKE_xerbla( "LAPACKE_slarfb", -8 );
            return -8;
        }
        if( LAPACKE_str_nancheck( matrix_layout, 'u', 'u', k,
            &v[(nrows_v-k)*ldv], ldv ) )
            return -9;
        if( LAPACKE_sge_nancheck( matrix_layout, nrows_v-k, ncols_v, v, ldv ) )
            return -9;
    } else if( LAPACKE_lsame( storev, 'r' ) && LAPACKE_lsame( direct, 'f' ) ) {
        if( LAPACKE_str_nancheck( matrix_layout, 'u', 'u', k, v, ldv ) )
            return -9;
        if( LAPACKE_sge_nancheck( matrix_layout, nrows_v, ncols_v-k, &v[k],
            ldv ) )
            return -9;
    } else if( LAPACKE_lsame( storev, 'r' ) && LAPACKE_lsame( direct, 'f' ) ) {
        if( k > ncols_v ) {
            LAPACKE_xerbla( "LAPACKE_slarfb", -8 );
            return -8;
        }
        if( LAPACKE_str_nancheck( matrix_layout, 'l', 'u', k, &v[ncols_v-k],
            ldv ) )
            return -9;
        if( LAPACKE_sge_nancheck( matrix_layout, nrows_v, ncols_v-k, v, ldv ) )
            return -9;
    }
#endif
    /* Allocate memory for working array(s) */
    work = (float*)LAPACKE_malloc( sizeof(float) * ldwork * MAX(1,k) );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    /* Call middle-level interface */
    info = LAPACKE_slarfb_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_slarfb", info );
    }
    return info;
}