Blame thirdparty/openblas/xianyi-OpenBLAS-e6e87a2/lapack/potf2/potf2_L.c

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/*********************************************************************/
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/* Copyright 2009, 2010 The University of Texas at Austin.           */
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/* All rights reserved.                                              */
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/*                                                                   */
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/* Redistribution and use in source and binary forms, with or        */
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/* without modification, are permitted provided that the following   */
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/* conditions are met:                                               */
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/*                                                                   */
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/*   1. Redistributions of source code must retain the above         */
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/*      copyright notice, this list of conditions and the following  */
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/*      disclaimer.                                                  */
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/*                                                                   */
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/*   2. Redistributions in binary form must reproduce the above      */
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/*      copyright notice, this list of conditions and the following  */
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/*      disclaimer in the documentation and/or other materials       */
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/*      provided with the distribution.                              */
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/*                                                                   */
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/*    THIS  SOFTWARE IS PROVIDED  BY THE  UNIVERSITY OF  TEXAS AT    */
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/*    AUSTIN  ``AS IS''  AND ANY  EXPRESS OR  IMPLIED WARRANTIES,    */
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/*    INCLUDING, BUT  NOT LIMITED  TO, THE IMPLIED  WARRANTIES OF    */
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/*    MERCHANTABILITY  AND FITNESS FOR  A PARTICULAR  PURPOSE ARE    */
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/*    DISCLAIMED.  IN  NO EVENT SHALL THE UNIVERSITY  OF TEXAS AT    */
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/*    AUSTIN OR CONTRIBUTORS BE  LIABLE FOR ANY DIRECT, INDIRECT,    */
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/*    INCIDENTAL,  SPECIAL, EXEMPLARY,  OR  CONSEQUENTIAL DAMAGES    */
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/*    (INCLUDING, BUT  NOT LIMITED TO,  PROCUREMENT OF SUBSTITUTE    */
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/*    GOODS  OR  SERVICES; LOSS  OF  USE,  DATA,  OR PROFITS;  OR    */
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/*    BUSINESS INTERRUPTION) HOWEVER CAUSED  AND ON ANY THEORY OF    */
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/*    LIABILITY, WHETHER  IN CONTRACT, STRICT  LIABILITY, OR TORT    */
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/*    (INCLUDING NEGLIGENCE OR OTHERWISE)  ARISING IN ANY WAY OUT    */
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/*    OF  THE  USE OF  THIS  SOFTWARE,  EVEN  IF ADVISED  OF  THE    */
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/*    POSSIBILITY OF SUCH DAMAGE.                                    */
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/*                                                                   */
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/* The views and conclusions contained in the software and           */
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/* documentation are those of the authors and should not be          */
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/* interpreted as representing official policies, either expressed   */
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/* or implied, of The University of Texas at Austin.                 */
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/*********************************************************************/
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#include <stdio.h></stdio.h>
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#include <math.h></math.h>
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#include "common.h"
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static FLOAT dm1 = -1.;
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static FLOAT dp1 =  1.;
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#ifndef SQRT
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#define SQRT(x)	sqrt(x)
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#endif
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blasint CNAME(blas_arg_t *args, BLASLONG *range_m, BLASLONG *range_n, FLOAT *sa, FLOAT *sb, BLASLONG myid) {
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  BLASLONG n, lda;
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  FLOAT *a;
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  FLOAT ajj;
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  FLOAT *aoffset;
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  BLASLONG i, j;
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  n      = args -> n;
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  a      = (FLOAT *)args -> a;
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  lda    = args -> lda;
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  if (range_n) {
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    n      = range_n[1] - range_n[0];
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    a     += range_n[0] * (lda + 1) * COMPSIZE;
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  }
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  aoffset = a;
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  for (j = 0; j < n; j++) {
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    ajj = *(aoffset + j) - DOTU_K(j, a + j, lda, a + j, lda);
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    if (ajj <= 0){
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      *(aoffset + j) = ajj;
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      return j + 1;
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    }
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    ajj = SQRT(ajj);
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    *(aoffset + j) = ajj;
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    i = n - j - 1;
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    if (i > 0) {
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      GEMV_N(i, j, 0, dm1, 
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	     a + j + 1, lda,
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	     a + j, lda,
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	     aoffset + j + 1, 1, sb);
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      SCAL_K(i, 0, 0, dp1 / ajj,
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	     aoffset + j + 1, 1, NULL, 0, NULL, 0);
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    }
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    aoffset += lda;
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  }
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  return 0;
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}