lapacke_ssptrd_work.c

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* Contents: Native middle-level C interface to LAPACK function ssptrd
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_ssptrd_work( int matrix_layout, char uplo, lapack_int n,
                                float* ap, float* d, float* e, float* tau )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_ssptrd( &uplo, &n, ap, d, e, tau, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        float* ap_t = NULL;
        /* Allocate memory for temporary array(s) */
        ap_t = (float*)
            LAPACKE_malloc( sizeof(float) * ( MAX(1,n) * MAX(2,n+1) ) / 2 );
        if( ap_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        /* Transpose input matrices */
        LAPACKE_ssp_trans( matrix_layout, uplo, n, ap, ap_t );
        /* Call LAPACK function and adjust info */
        LAPACK_ssptrd( &uplo, &n, ap_t, d, e, tau, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_ssp_trans( LAPACK_COL_MAJOR, uplo, n, ap_t, ap );
        /* Release memory and exit */
        LAPACKE_free( ap_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_ssptrd_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_ssptrd_work", info );
    }
    return info;
}