symv_k.c

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/* Copyright 2009, 2010 The University of Texas at Austin.           */
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#include <stdio.h>
#include <ctype.h>
#include "common.h"
#include "symcopy.h"

int CNAME(BLASLONG m, BLASLONG offset, FLOAT alpha, FLOAT *a, BLASLONG lda,
	  FLOAT *x, BLASLONG incx, FLOAT *y, BLASLONG incy, FLOAT *buffer){

  BLASLONG is, min_i;
  FLOAT *X = x;
  FLOAT *Y = y;
  FLOAT *symbuffer  = buffer;
  FLOAT *gemvbuffer = (FLOAT *)(((BLASLONG)buffer + SYMV_P * SYMV_P * sizeof(FLOAT) + 4095) & ~4095);
  FLOAT *bufferY    = gemvbuffer;
  FLOAT *bufferX    = gemvbuffer;

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

  if (incx != 1) {
    X = bufferX;
    gemvbuffer = (FLOAT *)(((BLASLONG)bufferX + m * sizeof(FLOAT) + 4095) & ~4095);
    COPY_K(m, x, incx, X, 1);
  }

#ifndef LOWER
  for(is = m - offset; is < m; is += SYMV_P){
    min_i = MIN(m - is, SYMV_P);
#else
  for(is = 0; is < offset; is += SYMV_P){
    min_i = MIN(offset - is, SYMV_P);
#endif

#ifndef LOWER
    if (is >0){
      GEMV_T(is, min_i, 0, alpha,
	     a + is * lda, lda,
	     X,            1,
	     Y + is,       1, gemvbuffer);

      GEMV_N(is, min_i, 0, alpha,
	     a + is * lda,  lda,
	     X + is, 1,
	     Y,      1, gemvbuffer);
    }
#endif

#ifdef LOWER
    SYMCOPY_L(min_i, a + is + is * lda, lda, symbuffer);
#else
    SYMCOPY_U(min_i, a + is + is * lda, lda, symbuffer);
#endif

    GEMV_N(min_i, min_i, 0, alpha,
	   symbuffer, min_i,
	   X + is, 1,
	   Y + is, 1, gemvbuffer);

#ifdef LOWER
    if (m - is >  min_i){
      GEMV_T(m - is - min_i, min_i, 0, alpha,
	     a + (is + min_i) + is * lda, lda,
	     X + (is + min_i), 1,
	     Y + is,            1, gemvbuffer);

      GEMV_N(m - is - min_i, min_i, 0, alpha,
	     a + (is + min_i) + is * lda, lda,
	     X +  is,            1,
	     Y + (is + min_i),  1, gemvbuffer);
    }
#endif

  } /* end of is */

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

  return 0;
}