lapacke_dhseqr_work.c
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00001 /*****************************************************************************
00002   Copyright (c) 2010, Intel Corp.
00003   All rights reserved.
00004 
00005   Redistribution and use in source and binary forms, with or without
00006   modification, are permitted provided that the following conditions are met:
00007 
00008     * Redistributions of source code must retain the above copyright notice,
00009       this list of conditions and the following disclaimer.
00010     * Redistributions in binary form must reproduce the above copyright
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00013     * Neither the name of Intel Corporation nor the names of its contributors
00014       may be used to endorse or promote products derived from this software
00015       without specific prior written permission.
00016 
00017   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00018   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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00021   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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00028 ******************************************************************************
00029 * Contents: Native middle-level C interface to LAPACK function dhseqr
00030 * Author: Intel Corporation
00031 * Generated October, 2010
00032 *****************************************************************************/
00033 
00034 #include "lapacke.h"
00035 #include "lapacke_utils.h"
00036 
00037 lapack_int LAPACKE_dhseqr_work( int matrix_order, char job, char compz,
00038                                 lapack_int n, lapack_int ilo, lapack_int ihi,
00039                                 double* h, lapack_int ldh, double* wr,
00040                                 double* wi, double* z, lapack_int ldz,
00041                                 double* work, lapack_int lwork )
00042 {
00043     lapack_int info = 0;
00044     if( matrix_order == LAPACK_COL_MAJOR ) {
00045         /* Call LAPACK function and adjust info */
00046         LAPACK_dhseqr( &job, &compz, &n, &ilo, &ihi, h, &ldh, wr, wi, z, &ldz,
00047                        work, &lwork, &info );
00048         if( info < 0 ) {
00049             info = info - 1;
00050         }
00051     } else if( matrix_order == LAPACK_ROW_MAJOR ) {
00052         lapack_int ldh_t = MAX(1,n);
00053         lapack_int ldz_t = MAX(1,n);
00054         double* h_t = NULL;
00055         double* z_t = NULL;
00056         /* Check leading dimension(s) */
00057         if( ldh < n ) {
00058             info = -8;
00059             LAPACKE_xerbla( "LAPACKE_dhseqr_work", info );
00060             return info;
00061         }
00062         if( ldz < n ) {
00063             info = -12;
00064             LAPACKE_xerbla( "LAPACKE_dhseqr_work", info );
00065             return info;
00066         }
00067         /* Query optimal working array(s) size if requested */
00068         if( lwork == -1 ) {
00069             LAPACK_dhseqr( &job, &compz, &n, &ilo, &ihi, h, &ldh_t, wr, wi, z,
00070                            &ldz_t, work, &lwork, &info );
00071             return (info < 0) ? (info - 1) : info;
00072         }
00073         /* Allocate memory for temporary array(s) */
00074         h_t = (double*)LAPACKE_malloc( sizeof(double) * ldh_t * MAX(1,n) );
00075         if( h_t == NULL ) {
00076             info = LAPACK_TRANSPOSE_MEMORY_ERROR;
00077             goto exit_level_0;
00078         }
00079         if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
00080             z_t = (double*)LAPACKE_malloc( sizeof(double) * ldz_t * MAX(1,n) );
00081             if( z_t == NULL ) {
00082                 info = LAPACK_TRANSPOSE_MEMORY_ERROR;
00083                 goto exit_level_1;
00084             }
00085         }
00086         /* Transpose input matrices */
00087         LAPACKE_dge_trans( matrix_order, n, n, h, ldh, h_t, ldh_t );
00088         if( LAPACKE_lsame( compz, 'v' ) ) {
00089             LAPACKE_dge_trans( matrix_order, n, n, z, ldz, z_t, ldz_t );
00090         }
00091         /* Call LAPACK function and adjust info */
00092         LAPACK_dhseqr( &job, &compz, &n, &ilo, &ihi, h_t, &ldh_t, wr, wi, z_t,
00093                        &ldz_t, work, &lwork, &info );
00094         if( info < 0 ) {
00095             info = info - 1;
00096         }
00097         /* Transpose output matrices */
00098         LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, h_t, ldh_t, h, ldh );
00099         if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
00100             LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, z_t, ldz_t, z, ldz );
00101         }
00102         /* Release memory and exit */
00103         if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
00104             LAPACKE_free( z_t );
00105         }
00106 exit_level_1:
00107         LAPACKE_free( h_t );
00108 exit_level_0:
00109         if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
00110             LAPACKE_xerbla( "LAPACKE_dhseqr_work", info );
00111         }
00112     } else {
00113         info = -1;
00114         LAPACKE_xerbla( "LAPACKE_dhseqr_work", info );
00115     }
00116     return info;
00117 }


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