OpenBLAS/driver/level2/zsbmv_k.c

/*********************************************************************/
/* Copyright 2009, 2010 The University of Texas at Austin.           */
/* All rights reserved.                                              */
/*                                                                   */
/* 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 distribution.                              */
/*                                                                   */
/*    THIS  SOFTWARE IS PROVIDED  BY THE  UNIVERSITY OF  TEXAS AT    */
/*    AUSTIN  ``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  OF TEXAS AT    */
/*    AUSTIN OR CONTRIBUTORS BE  LIABLE FOR ANY DIRECT, INDIRECT,    */
/*    INCIDENTAL,  SPECIAL, 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 THEORY OF    */
/*    LIABILITY, WHETHER  IN CONTRACT, STRICT  LIABILITY, OR TORT    */
/*    (INCLUDING NEGLIGENCE OR OTHERWISE)  ARISING IN ANY WAY OUT    */
/*    OF  THE  USE OF  THIS  SOFTWARE,  EVEN  IF ADVISED  OF  THE    */
/*    POSSIBILITY OF SUCH DAMAGE.                                    */
/*                                                                   */
/* The views and conclusions contained in the software and           */
/* documentation are those of the authors and should not be          */
/* interpreted as representing official policies, either expressed   */
/* or implied, of The University of Texas at Austin.                 */
/*********************************************************************/

#include <stdio.h>
#include <ctype.h>
#include "common.h"

int CNAME(BLASLONG n, BLASLONG k, FLOAT alpha_r, FLOAT alpha_i,
	  FLOAT *a, BLASLONG lda,
	  FLOAT *x, BLASLONG incx, FLOAT *y, BLASLONG incy, void *buffer){

  BLASLONG i, length;
#ifndef LOWER
  BLASLONG offset;
#endif

  FLOAT *X = x;
  FLOAT *Y = y;
  FLOAT *sbmvbuffer = (FLOAT *)buffer;
  FLOAT *bufferY    = sbmvbuffer;
  FLOAT *bufferX    = sbmvbuffer;

  OPENBLAS_COMPLEX_FLOAT result;

  if (incy != 1) {
    Y = bufferY;
    bufferX    = (FLOAT *)(((BLASLONG)bufferY + n * sizeof(FLOAT) * COMPSIZE + 4095) & ~4095);
    // sbmvbuffer = bufferX;
    COPY_K(n, y, incy, Y, 1);
  }

  if (incx != 1) {
    X = bufferX;
    // sbmvbuffer = (FLOAT *)(((BLASLONG)bufferX + n * sizeof(FLOAT) * COMPSIZE + 4095) & ~4095);
    COPY_K(n, x, incx, X, 1);
  }

#ifndef LOWER
  offset = k;
#endif

  for (i = 0; i < n; i++) {

#ifndef LOWER
    length  = k - offset;

    AXPYU_K(length + 1, 0, 0,
	    alpha_r * X[i * 2 + 0] - alpha_i * X[i * 2 + 1],
	    alpha_r * X[i * 2 + 1] + alpha_i * X[i * 2 + 0],
	    a + offset * COMPSIZE, 1, Y + (i - length) * COMPSIZE, 1, NULL, 0);

    if (length > 0) {
      result = DOTU_K(length, a + offset * COMPSIZE, 1, X + (i - length) * COMPSIZE, 1);

      Y[i * 2 + 0] += alpha_r * CREAL(result) - alpha_i * CIMAG(result);
      Y[i * 2 + 1] += alpha_r * CIMAG(result) + alpha_i * CREAL(result);
      }

    if (offset > 0) offset --;
#else
    length  = k;
    if (n - i - 1 < k) length = n - i - 1;

    AXPYU_K(length + 1, 0, 0,
	    alpha_r * X[i * 2 + 0] - alpha_i * X[i * 2 + 1],
	    alpha_r * X[i * 2 + 1] + alpha_i * X[i * 2 + 0],
	    a, 1, Y + i * COMPSIZE, 1, NULL, 0);

    if (length > 0) {
      result = DOTU_K(length, a + COMPSIZE, 1, X + (i + 1) * COMPSIZE, 1);

      Y[i * 2 + 0] += alpha_r * CREAL(result) - alpha_i * CIMAG(result);
      Y[i * 2 + 1] += alpha_r * CIMAG(result) + alpha_i * CREAL(result);
      }
#endif

    a += lda * 2;
  }

  if (incy != 1) {
    COPY_K(n, Y, 1, y, incy);
  }

  return 0;
}