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154 lines
6.2 KiB
154 lines
6.2 KiB
2 years ago
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/*****************************************************************************
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Copyright (c) 2022, Intel Corp.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Intel Corporation nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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THE POSSIBILITY OF SUCH DAMAGE.
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******************************************************************************
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* Contents: Native C interface to LAPACK utility function
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* Author: Simon Märtens
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*****************************************************************************/
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#include "lapacke_utils.h"
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/*****************************************************************************
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Converts input triangular matrix from row-major(C) to column-major(Fortran)
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layout or vice versa. The shape of the trapezoidal matrix is determined by
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the arguments `direct` and `uplo`. `Direct` chooses the diagonal which shall
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be considered and `uplo` tells us whether we use the upper or lower part of
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the matrix with respect to the chosen diagonal.
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Diagonals 'F' (front / forward) and 'B' (back / backward):
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A = ( F ) A = ( F B )
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( F ) ( F B )
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( B F ) ( F B )
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( B )
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( B )
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direct = 'F', uplo = 'L':
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A = ( * ) A = ( * )
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( * * ) ( * * )
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( * * * ) ( * * * )
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( * * * )
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( * * * )
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direct = 'F', uplo = 'U':
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A = ( * * * ) A = ( * * * * * )
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( * * ) ( * * * * )
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( * ) ( * * * )
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( )
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( )
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direct = 'B', uplo = 'L':
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A = ( ) A = ( * * * )
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( ) ( * * * * )
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( * ) ( * * * * * )
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( * * )
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( * * * )
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direct = 'B', uplo = 'U':
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A = ( * * * ) A = ( * * * )
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( * * * ) ( * * )
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( * * * ) ( * )
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( * * )
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( * )
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*****************************************************************************/
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void LAPACKE_ctz_trans( int matrix_layout, char direct, char uplo,
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char diag, lapack_int m, lapack_int n,
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const lapack_complex_float *in, lapack_int ldin,
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lapack_complex_float *out, lapack_int ldout )
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{
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lapack_logical colmaj, front, lower, unit;
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if( in == NULL || out == NULL ) return ;
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colmaj = ( matrix_layout == LAPACK_COL_MAJOR );
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front = LAPACKE_lsame( direct, 'f' );
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lower = LAPACKE_lsame( uplo, 'l' );
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unit = LAPACKE_lsame( diag, 'u' );
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if( ( !colmaj && ( matrix_layout != LAPACK_ROW_MAJOR ) ) ||
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( !front && !LAPACKE_lsame( direct, 'b' ) ) ||
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( !lower && !LAPACKE_lsame( uplo, 'u' ) ) ||
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( !unit && !LAPACKE_lsame( diag, 'n' ) ) ) {
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/* Just exit if any of input parameters are wrong */
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return;
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}
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/* Initial offsets and sizes of triangular and rectangular parts */
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lapack_int tri_in_offset = 0;
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lapack_int tri_out_offset = 0;
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lapack_int tri_n = MIN(m,n);
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lapack_int rect_in_offset = -1;
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lapack_int rect_out_offset = -1;
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lapack_int rect_m = ( m > n ) ? m - n : m;
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lapack_int rect_n = ( n > m ) ? n - m : n;
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/* Fix offsets depending on the shape of the matrix */
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if( front ) {
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if( lower && m > n ) {
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rect_in_offset = tri_n * ( !colmaj ? ldin : 1 );
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rect_out_offset = tri_n * ( colmaj ? ldout : 1 );
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} else if( !lower && n > m ) {
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rect_in_offset = tri_n * ( colmaj ? ldin : 1 );
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rect_out_offset = tri_n * ( !colmaj ? ldout : 1 );
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}
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} else {
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if( m > n ) {
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tri_in_offset = rect_m * ( !colmaj ? ldin : 1 );
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tri_out_offset = rect_m * ( colmaj ? ldout : 1 );
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if( !lower ) {
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rect_in_offset = 0;
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rect_out_offset = 0;
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}
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} else if( n > m ) {
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tri_in_offset = rect_n * ( colmaj ? ldin : 1 );
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tri_out_offset = rect_n * ( !colmaj ? ldout : 1 );
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if( lower ) {
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rect_in_offset = 0;
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rect_out_offset = 0;
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}
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}
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}
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/* Copy & transpose rectangular part */
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if( rect_in_offset >= 0 && rect_out_offset >= 0 ) {
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LAPACKE_cge_trans( matrix_layout, rect_m, rect_n,
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&in[rect_in_offset], ldin,
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&out[rect_out_offset], ldout );
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}
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/* Copy & transpose triangular part */
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LAPACKE_ctr_trans( matrix_layout, uplo, diag, tri_n,
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&in[tri_in_offset], ldin,
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&out[tri_out_offset], ldout );
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}
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