lapacke_slarfx_work.c

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* Contents: Native middle-level C interface to LAPACK function slarfx
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_slarfx_work( int matrix_layout, char side, lapack_int m,
                                lapack_int n, const float* v, float tau,
                                float* c, lapack_int ldc, float* work )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_slarfx( &side, &m, &n, v, &tau, c, &ldc, work );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldc_t = MAX(1,m);
        float* c_t = NULL;
        /* Check leading dimension(s) */
        if( ldc < n ) {
            info = -8;
            LAPACKE_xerbla( "LAPACKE_slarfx_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        c_t = (float*)LAPACKE_malloc( sizeof(float) * ldc_t * MAX(1,n) );
        if( c_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        /* Transpose input matrices */
        LAPACKE_sge_trans( matrix_layout, m, n, c, ldc, c_t, ldc_t );
        /* Call LAPACK function and adjust info */
        LAPACK_slarfx( &side, &m, &n, v, &tau, c_t, &ldc_t, work );
        info = 0;  /* LAPACK call is ok! */
        /* Transpose output matrices */
        LAPACKE_sge_trans( LAPACK_COL_MAJOR, m, n, c_t, ldc_t, c, ldc );
        /* Release memory and exit */
        LAPACKE_free( c_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_slarfx_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_slarfx_work", info );
    }
    return info;
}