OpenBLAS/kernel/arm64/gemv_t_sve.c

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#include <arm_sve.h>
#include "common.h"

#ifdef DOUBLE
#define SV_COUNT svcntd
#define SV_TYPE svfloat64_t
#define SV_TRUE svptrue_b64
#define SV_WHILE svwhilelt_b64_s64
#define SV_DUP svdup_f64
#else
#define SV_COUNT svcntw
#define SV_TYPE svfloat32_t
#define SV_TRUE svptrue_b32
#define SV_WHILE svwhilelt_b32_s64
#define SV_DUP svdup_f32
#endif

int CNAME(BLASLONG m, BLASLONG n, BLASLONG dummy1, FLOAT alpha, FLOAT *a, BLASLONG lda, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT *buffer)
{
  BLASLONG i;
  BLASLONG ix,iy;
  BLASLONG j;
  FLOAT *a_ptr;
  FLOAT temp;

  iy = 0;
  a_ptr = a;

  if (inc_x == 1) {
    svbool_t pg_true = SV_TRUE();
    uint64_t sve_size = SV_COUNT();
    uint64_t sve_size2 = sve_size * 2;
    BLASLONG m1 = m & -sve_size;
    BLASLONG m2 = m & -sve_size2;

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

      SV_TYPE temp_vec_v2_0 = SV_DUP(0.0);
      SV_TYPE temp_vec_v2_1 = SV_DUP(0.0);
      for (; i < m2; i += sve_size2) {
        SV_TYPE a_vec0 = svld1(pg_true, a_ptr + i);
        SV_TYPE x_vec0 = svld1(pg_true, x + i);
        SV_TYPE a_vec1 = svld1(pg_true, a_ptr + i + sve_size);
        SV_TYPE x_vec1 = svld1(pg_true, x + i + sve_size);
        temp_vec_v2_0 = svmla_m(pg_true, temp_vec_v2_0, a_vec0, x_vec0);
        temp_vec_v2_1 = svmla_m(pg_true, temp_vec_v2_1, a_vec1, x_vec1);
      }

      SV_TYPE temp_vec_v1 = SV_DUP(0.0);
      for (; i < m1; i += sve_size) {
        SV_TYPE a_vec0 = svld1(pg_true, a_ptr + i);
        SV_TYPE x_vec0 = svld1(pg_true, x + i);
        temp_vec_v1 = svmla_m(pg_true, temp_vec_v1, a_vec0, x_vec0);
      }

      SV_TYPE temp_vec = SV_DUP(0.0);
      for (; i < m; i += sve_size) {
        svbool_t pg = SV_WHILE(i, m);
        SV_TYPE a_vec = svld1(pg, a_ptr + i);
        SV_TYPE x_vec = svld1(pg, x + i);
        temp_vec = svmla_m(pg, temp_vec, a_vec, x_vec);
      }

      y[iy] += alpha * (
        (svaddv(SV_TRUE(), temp_vec_v2_0) + svaddv(SV_TRUE(), temp_vec)) +
        (svaddv(SV_TRUE(), temp_vec_v2_1) + svaddv(SV_TRUE(), temp_vec_v1))
      );

      iy += inc_y;
      a_ptr += lda;
    }
    return(0);
  }

  for (j = 0; j < n; j++) {
    temp = 0.0;
    ix = 0;
    for (i = 0; i < m; i++) {
      temp += a_ptr[i] * x[ix];
      ix += inc_x;
    }
    y[iy] += alpha * temp;
    iy += inc_y;
    a_ptr += lda;
  }
  return (0);
}