Blame thirdparty/openblas/xianyi-OpenBLAS-e6e87a2/driver/level2/ztbsv_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 <ctype.h></ctype.h>
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#include "common.h"
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const static FLOAT dp1 = 1.;
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int CNAME(BLASLONG n, BLASLONG k, FLOAT *a, BLASLONG lda, FLOAT *b, BLASLONG incb, void *buffer){
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  BLASLONG i;
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  FLOAT *gemvbuffer = (FLOAT *)buffer;
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  FLOAT *B = b;
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  BLASLONG length;
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#if (TRANSA == 2) || (TRANSA == 4)
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  FLOAT _Complex temp;
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#endif
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#ifndef UNIT
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  FLOAT ar, ai, br, bi, ratio, den;
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#endif
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  if (incb != 1) {
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    B = buffer;
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    gemvbuffer = (FLOAT *)(((BLASLONG)buffer + n * sizeof(FLOAT) * COMPSIZE + 4095) & ~4095);
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    COPY_K(n, b, incb, buffer, 1);
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  }
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  for (i = 0; i < n; i++) {
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#if (TRANSA == 2) || (TRANSA == 4)
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    length  = i;
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    if (length > k) length = k;
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    if (length > 0) {
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#if TRANSA == 2
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      temp = DOTU_K(length, a + (k - length) * COMPSIZE, 1, B + (i - length) * COMPSIZE, 1);
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#else
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      temp = DOTC_K(length, a + (k - length) * COMPSIZE, 1, B + (i - length) * COMPSIZE, 1);
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#endif
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      B[i * 2 + 0] -= CREAL(temp);
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      B[i * 2 + 1] -= CIMAG(temp);
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    }
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#endif
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#ifndef UNIT
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#if (TRANSA == 1) || (TRANSA == 3)
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    ar = a[0];
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    ai = a[1];
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#else
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    ar = a[k * 2 + 0];
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    ai = a[k * 2 + 1];
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#endif
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    if (fabs(ar) >= fabs(ai)){
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      ratio = ai / ar;
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      den = 1./(ar * ( 1 + ratio * ratio));
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      ar =  den;
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#if TRANSA < 3
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      ai = -ratio * den;
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#else
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      ai =  ratio * den;
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#endif
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    } else {
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      ratio = ar / ai;
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      den = 1./(ai * ( 1 + ratio * ratio));
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      ar =  ratio * den;
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#if TRANSA < 3
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      ai = -den;
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#else
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      ai =  den;
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#endif
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    }
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    br = B[i * 2 + 0];
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    bi = B[i * 2 + 1];
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    B[i * 2 + 0] = ar*br - ai*bi;
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    B[i * 2 + 1] = ar*bi + ai*br;
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#endif
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#if (TRANSA == 1) || (TRANSA == 3)
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    length  = n - i - 1;
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    if (length > k) length = k;
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    if (length > 0) {
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#if   TRANSA == 1
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      AXPYU_K(length, 0, 0,
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	      -B[i * 2 + 0],  -B[i * 2 + 1],
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	      a + COMPSIZE, 1, B + (i + 1) * COMPSIZE, 1, NULL, 0);
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#else
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      AXPYC_K(length, 0, 0,
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	      -B[i * 2 + 0],  -B[i * 2 + 1],
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	      a + COMPSIZE, 1, B + (i + 1) * COMPSIZE, 1, NULL, 0);
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#endif
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    }
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#endif
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    a += lda * COMPSIZE;
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  }
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  if (incb != 1) {
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    COPY_K(n, buffer, 1, b, incb);
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  }
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  return 0;
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}
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