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*****************************************************************************
* Contents: Native middle-level C interface to LAPACK function zhfrk
* Author: Intel Corporation
*****************************************************************************/

#include "lapacke_utils.h"

lapack_int LAPACKE_zhfrk_work( int matrix_layout, char transr, char uplo,
                               char trans, lapack_int n, lapack_int k,
                               double alpha, const lapack_complex_double* a,
                               lapack_int lda, double beta,
                               lapack_complex_double* c )
{
    lapack_int info = 0;
    lapack_int na, ka, lda_t;
    lapack_complex_double *a_t = NULL, *c_t = NULL;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_zhfrk( &transr, &uplo, &trans, &n, &k, &alpha, a, &lda, &beta,
                      c );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        na = LAPACKE_lsame( trans, 'n' ) ? n : k;
        ka = LAPACKE_lsame( trans, 'n' ) ? k : n;
        lda_t = MAX(1,na);
        /* Check leading dimension(s) */
        if( lda < ka ) {
            info = -9;
            LAPACKE_xerbla( "LAPACKE_zhfrk_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        a_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) * lda_t * MAX(1,ka) );
        if( a_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        c_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) *
                            ( MAX(1,n) * MAX(2,n+1) ) / 2 );
        if( c_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        /* Transpose input matrices */
        LAPACKE_zge_trans( matrix_layout, na, ka, a, lda, a_t, lda_t );
        LAPACKE_zpf_trans( matrix_layout, transr, uplo, n, c, c_t );
        /* Call LAPACK function and adjust info */
        LAPACK_zhfrk( &transr, &uplo, &trans, &n, &k, &alpha, a_t, &lda_t,
                      &beta, c_t );
        info = 0;  /* LAPACK call is ok! */
        /* Transpose output matrices */
        LAPACKE_zpf_trans( LAPACK_COL_MAJOR, transr, uplo, n, c_t, c );
        /* Release memory and exit */
        LAPACKE_free( c_t );
exit_level_1:
        LAPACKE_free( a_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_zhfrk_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_zhfrk_work", info );
    }
    return info;
}
