lapacke_zgemqr_work.c

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* Contents: Native middle-level C interface to LAPACK function zgemqr
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_zgemqr_work( int matrix_layout, char side, char trans,
                                lapack_int m, lapack_int n, lapack_int k,
                                const lapack_complex_double* a, lapack_int lda,
                                const lapack_complex_double* t, lapack_int tsize,
                                lapack_complex_double* c, lapack_int ldc,
                                lapack_complex_double* work, lapack_int lwork )
{
    lapack_int info = 0;
    lapack_int r;
    lapack_int lda_t, ldc_t;
    lapack_complex_double *a_t = NULL, *c_t = NULL;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_zgemqr( &side, &trans, &m, &n, &k, a, &lda, t, &tsize, c, &ldc,
                       work, &lwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        r = LAPACKE_lsame( side, 'l' ) ? m : n;
        lda_t = MAX(1,r);
        ldc_t = MAX(1,m);
        /* Check leading dimension(s) */
        if( lda < k ) {
            info = -8;
            LAPACKE_xerbla( "LAPACKE_zgemqr_work", info );
            return info;
        }
        if( ldc < n ) {
            info = -11;
            LAPACKE_xerbla( "LAPACKE_zgemqr_work", info );
            return info;
        }
        /* Query optimal working array(s) size if requested */
        if( lwork == -1 ) {
            LAPACK_zgemqr( &side, &trans, &m, &n, &k, a, &lda_t, t, &tsize,
                           c, &ldc_t, work, &lwork, &info );
            return (info < 0) ? (info - 1) : info;
        }
        /* Allocate memory for temporary array(s) */
        a_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) * lda_t * MAX(1,k) );
        if( a_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        c_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) * ldc_t * MAX(1,n) );
        if( c_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        /* Transpose input matrices */
        LAPACKE_zge_trans( matrix_layout, r, k, a, lda, a_t, lda_t );
        LAPACKE_zge_trans( matrix_layout, m, n, c, ldc, c_t, ldc_t );
        /* Call LAPACK function and adjust info */
        LAPACK_zgemqr( &side, &trans, &m, &n, &k, a_t, &lda_t, t, &tsize,
                       c_t, &ldc_t, work, &lwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_zge_trans( LAPACK_COL_MAJOR, m, n, c_t, ldc_t, c, ldc );
        /* 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_zgemqr_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_zgemqr_work", info );
    }
    return info;
}