lapacke_dsytrf_aa_2stage_work.c

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* Contents: Native middle-level C interface to LAPACK function dsytrf_aa
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dsytrf_aa_2stage_work( int matrix_layout, char uplo, lapack_int n,
                               double* a, lapack_int lda,
                               double* tb, lapack_int ltb,  
                               lapack_int* ipiv, lapack_int* ipiv2,
                               double* work, lapack_int lwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dsytrf_aa_2stage( &uplo, &n, a, &lda, tb, 
                                         &ltb, ipiv, ipiv2, work, &lwork,
                         &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int lda_t = MAX(1,n);
        double* a_t = NULL;
        double* tb_t = NULL;
        /* Check leading dimension(s) */
        if( lda < n ) {
            info = -6;
            LAPACKE_xerbla( "LAPACKE_dsytrf_aa_2stage_work", info );
            return info;
        }
        if( ltb < 4*n ) {
            info = -8;
            LAPACKE_xerbla( "LAPACKE_dsytrf_aa_2stage_work", info );
            return info;
        }
        /* Query optimal working array(s) size if requested */
        if( lwork == -1 ) {
            LAPACK_dsytrf_aa_2stage( &uplo, &n, a, &lda_t,
                                 tb, &ltb, ipiv, ipiv2, work,
                          &lwork, &info );
            return (info < 0) ? (info - 1) : info;
        }
        /* Allocate memory for temporary array(s) */
        a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
        if( a_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        tb_t = (double*)LAPACKE_malloc( sizeof(double) * ltb );
        if( tb_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        /* Transpose input matrices */
        LAPACKE_dsy_trans( matrix_layout, uplo, n, a, lda, a_t, lda_t );
        /* Call LAPACK function and adjust info */
        LAPACK_dsytrf_aa_2stage( &uplo, &n, a_t, &lda_t, 
                                  tb_t, &ltb, ipiv, ipiv2, work,
                      &lwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_dsy_trans( LAPACK_COL_MAJOR, uplo, n, a_t, lda_t, a, lda );
        /* Release memory and exit */
        LAPACKE_free( tb_t );
exit_level_1:
        LAPACKE_free( a_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_dsytrf_aa_2stage_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dsytrf_aa_2stage_work", info );
    }
    return info;
}