atl_create_tree.c

来自「基于Blas CLapck的.用过的人知道是干啥的」· C语言 代码 · 共 96 行

/* ---------------------------------------------------------------------
 *
 * -- Automatically Tuned Linear Algebra Software (ATLAS)
 *    (C) Copyright 2000 All Rights Reserved
 *
 * -- ATLAS routine -- Version 3.2 -- December 25, 2000
 *
 * Author         : Antoine P. Petitet
 * Originally developed at the University of Tennessee,
 * Innovative Computing Laboratory, Knoxville TN, 37996-1301, USA.
 *
 * ---------------------------------------------------------------------
 *
 * -- Copyright notice and Licensing terms:
 *
 *  Redistribution  and  use in  source and binary forms, with or without
 *  modification, are  permitted provided  that the following  conditions
 *  are met:
 *
 * 1. Redistributions  of  source  code  must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce  the above copyright
 *    notice,  this list of conditions, and the  following disclaimer in
 *    the documentation and/or other materials provided with the distri-
 *    bution.
 * 3. The name of the University,  the ATLAS group,  or the names of its
 *    contributors  may not be used to endorse or promote products deri-
 *    ved from this software without specific written permission.
 *
 * -- Disclaimer:
 *
 * THIS  SOFTWARE  IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,  INCLUDING,  BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,  INDIRECT, INCIDENTAL, SPE-
 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO,  PROCUREMENT  OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEO-
 * RY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT  (IN-
 * CLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * ---------------------------------------------------------------------
 */
/*
 * Include files
 */
#include "atlas_ptmisc.h"

PT_TREE_T ATL_create_tree
(
   unsigned int               * PART,
   const int                  IPART,
   const int                  PSIZE
)
{
/*
 * Purpose
 * =======
 *
 * ATL_create_tree  creates a binary tree of size  PARTSIZE, setting the
 * node numbers to the contents of the array PART.
 *
 * Arguments
 * =========
 *
 * PART    (input)                       unsigned int *
 *         On entry, PART points to an array of size PARTSIZE containing
 *         the numbers to be attributed to each node.
 *
 * IPART   (input)                       const int
 *         On entry,  IPART  is  the index into the array  PART  of  the
 *         current node. IPART must be at least zero.
 *
 * PSIZE   (input)                       const int
 *         On entry, PSIZE specifies the total length of the array PART.
 *         PSIZE must be at least zero.
 *
 * ---------------------------------------------------------------------
 */
/* ..
 * .. Executable Statements ..
 *
 */
   if( IPART >= PSIZE ) return( NULL );

   return( ATL_init_node( PART[IPART],
                          ATL_create_tree( PART, (IPART << 1)+1, PSIZE ),
                          ATL_create_tree( PART, (IPART << 1)+2, PSIZE ),
                          NULL, NULL, NULL, NULL ) );
/*
 * End of ATL_create_tree
 */
}