OpenBLAS/kernel/power/sbgemv_n.c

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#ifndef SBGEMV_N_COMMON_C
#define SBGEMV_N_COMMON_C

#if (defined(_ARCH_PWR10) && (defined(USE_BFGEMV_8_N_MMA) || (!defined(USE_BFGEMV_N_MMA) && defined(USE_BFGEMV_8_N_VSX)))) || (!defined(_ARCH_PWR10) && defined(USE_BFGEMV_8_N_VSX))
#define USE_N_8
#endif

int CNAME(BLASLONG m, BLASLONG n, FLOAT alpha, IFLOAT *a, BLASLONG lda, IFLOAT *x, BLASLONG inc_x, FLOAT beta, FLOAT *y, BLASLONG inc_y)
{
  IFLOAT *x_ptr, *ap[4];
  IFLOAT xbuffer[8] __attribute__((aligned(16)));
  FLOAT *y_ptr, *ybuffer;
  FLOAT buffer[NBMAX] __attribute__((aligned(16)));

  if ((m < 1) || (n < 1)) return 0;

  ybuffer = buffer;
  y_ptr = y;

  BLASLONG lda4 = lda << 2;
#ifdef USE_N_8
  BLASLONG lda8 = lda << 3;
#endif
  BLASLONG NB = NBMAX;
  BLASLONG m2 = (m & (NBMAX - 1));

  while (NB == NBMAX) {
    m -= NB;
    if (m < 0) {
      if (m2 == 0) break;
      NB = m2;
    }

    if (inc_y != 1) {
      copy_y_beta(NB, y_ptr, ybuffer, inc_y, beta);
    } else {
      ybuffer = y_ptr;
      BF16GEMV_N_beta(NB, ybuffer, ybuffer, beta);
    }

    x_ptr = x;

    ap[0] = a;
    ap[1] = a + lda;
    ap[2] = ap[1] + lda;
    ap[3] = ap[2] + lda;

    if (inc_x == 1) {
#ifdef USE_N_8
      for (BLASLONG j = 0; j + 8 <= n; j += 8) {
        BF16GEMV_N_8(NB, ap, x_ptr, ybuffer, lda4, alpha);
        ap[0] += lda8;
        ap[1] += lda8;
        ap[2] += lda8;
        ap[3] += lda8;
        x_ptr += 8;
      }
      if (n & 4) {
#else
      for (BLASLONG j = 0; j + 4 <= n; j += 4) {
#endif
        BF16GEMV_N_4(NB, ap, x_ptr, ybuffer, alpha);
        ap[0] += lda4;
        ap[1] += lda4;
#ifndef USE_N_8
        ap[2] += lda4;
        ap[3] += lda4;
#endif
        x_ptr += 4;
      }
      if (n & 2) {
        BF16GEMV_N_2(NB, ap, x_ptr, ybuffer, alpha);
        ap[0] += (lda * 2);
        x_ptr += 2;
      }
      if (n & 1) {
        BF16GEMV_N_1(NB, ap, x_ptr, ybuffer, alpha);
      }
    } else {
#ifdef USE_N_8
      for (BLASLONG j = 0; j + 8 <= n; j += 8) {
        copy_x(8, x_ptr, xbuffer, inc_x);
        BF16GEMV_N_8(NB, ap, xbuffer, ybuffer, lda4, alpha);
        ap[0] += lda8;
        ap[1] += lda8;
        ap[2] += lda8;
        ap[3] += lda8;
        x_ptr += 8 * inc_x;
      }
      if (n & 4) {
#else
      for (BLASLONG j = 0; j + 4 <= n; j += 4) {
#endif
        copy_x(4, x_ptr, xbuffer, inc_x);
        BF16GEMV_N_4(NB, ap, xbuffer, ybuffer, alpha);
        ap[0] += lda4;
        ap[1] += lda4;
#ifndef USE_N_8
        ap[2] += lda4;
        ap[3] += lda4;
#endif
        x_ptr += 4 * inc_x;
      }
      if (n & 2) {
        copy_x(2, x_ptr, xbuffer, inc_x);
        BF16GEMV_N_2(NB, ap, xbuffer, ybuffer, alpha);
        ap[0] += (lda * 2);
        x_ptr += 2 * inc_x;
      }
      if (n & 1) {
        copy_x(1, x_ptr, xbuffer, inc_x);
        BF16GEMV_N_1(NB, ap, xbuffer, ybuffer, alpha);
      }
    }

    a += NB;
    if (inc_y != 1) {
      move_y(NB, ybuffer, y_ptr, inc_y);
    }
    y_ptr += (NB * inc_y);
  }

  return 0;
}
#endif