lapacke_ctr_trans.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
00011       notice, this list of conditions and the following disclaimer in the
00012       documentation and/or other materials provided with the distribution.
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
00019   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
00021   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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00023   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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00028 ******************************************************************************
00029 * Contents: Native C interface to LAPACK utility function
00030 * Author: Intel Corporation
00031 * Created in February, 2010
00032 *****************************************************************************/
00033 
00034 #include "lapacke_utils.h"
00035 
00036 /* Converts input triangular matrix from row-major(C) to column-major(Fortran)
00037  * layout or vice versa.
00038  */
00039 
00040 void LAPACKE_ctr_trans( int matrix_order, char uplo, char diag, lapack_int n,
00041                         const lapack_complex_float *in, lapack_int ldin,
00042                         lapack_complex_float *out, lapack_int ldout )
00043 {
00044     lapack_int i, j, st;
00045     lapack_logical colmaj, lower, unit;
00046 
00047     if( in == NULL || out == NULL ) return ;
00048 
00049     colmaj = ( matrix_order == LAPACK_COL_MAJOR );
00050     lower  = LAPACKE_lsame( uplo, 'l' );
00051     unit   = LAPACKE_lsame( diag, 'u' );
00052 
00053     if( ( !colmaj && ( matrix_order != LAPACK_ROW_MAJOR ) ) ||
00054         ( !lower  && !LAPACKE_lsame( uplo, 'u' ) ) ||
00055         ( !unit   && !LAPACKE_lsame( diag, 'n' ) ) ) {
00056         /* Just exit if any of input parameters are wrong */
00057         return;
00058     }
00059     if( unit ) {
00060         /* If unit, then don't touch diagonal, start from 1st column or row */
00061         st = 1;
00062     } else  {
00063         /* If non-unit, then check diagonal also, starting from [0,0] */
00064         st = 0;
00065     }
00066 
00067     /* Perform conversion:
00068      * Since col_major upper and row_major lower are equal,
00069      * and col_major lower and row_major upper are equals too -
00070      * using one code for equal cases. XOR( colmaj, upper )
00071      */
00072     if( ( colmaj || lower ) && !( colmaj && lower ) ) {
00073         for( j = st; j < MIN( n, ldout ); j++ ) {
00074             for( i = 0; i < MIN( j+1-st, ldin ); i++ ) {
00075                 out[ j+i*ldout ] = in[ i+j*ldin ];
00076             }
00077         }
00078     } else {
00079         for( j = 0; j < MIN( n-st, ldout ); j++ ) {
00080             for( i = j+st; i < MIN( n, ldin ); i++ ) {
00081                 out[ j+i*ldout ] = in[ i+j*ldin ];
00082             }
00083         }
00084     }
00085 }


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