OpenBLAS/kernel/arm64/gemv_n_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;

  ix = 0;
  a_ptr = a;

  if (inc_y == 1) {
    BLASLONG width = n / 3;
    uint64_t sve_size = SV_COUNT();
    svbool_t pg_true = SV_TRUE();
    svbool_t pg = SV_WHILE(0, m % sve_size);

    FLOAT *a0_ptr = a + lda * width * 0;
    FLOAT *a1_ptr = a + lda * width * 1;
    FLOAT *a2_ptr = a + lda * width * 2;

    for (j = 0; j < width; j++) {
      for (i = 0; (i + sve_size - 1) < m; i += sve_size) {
        ix = j * inc_x;

        SV_TYPE x0_vec = SV_DUP(alpha * x[ix + (inc_x * width * 0)]);
        SV_TYPE x1_vec = SV_DUP(alpha * x[ix + (inc_x * width * 1)]);
        SV_TYPE x2_vec = SV_DUP(alpha * x[ix + (inc_x * width * 2)]);

        SV_TYPE a00_vec = svld1(pg_true, a0_ptr + i);
        SV_TYPE a01_vec = svld1(pg_true, a1_ptr + i);
        SV_TYPE a02_vec = svld1(pg_true, a2_ptr + i);

        SV_TYPE y_vec = svld1(pg_true, y + i);
        y_vec = svmla_lane(y_vec, a00_vec, x0_vec, 0);
        y_vec = svmla_lane(y_vec, a01_vec, x1_vec, 0);
        y_vec = svmla_lane(y_vec, a02_vec, x2_vec, 0);

        svst1(pg_true, y + i, y_vec);
      }

      if (i < m) {
        SV_TYPE x0_vec = SV_DUP(alpha * x[ix + (inc_x * width * 0)]);
        SV_TYPE x1_vec = SV_DUP(alpha * x[ix + (inc_x * width * 1)]);
        SV_TYPE x2_vec = SV_DUP(alpha * x[ix + (inc_x * width * 2)]);

        SV_TYPE a00_vec = svld1(pg, a0_ptr + i);
        SV_TYPE a01_vec = svld1(pg, a1_ptr + i);
        SV_TYPE a02_vec = svld1(pg, a2_ptr + i);

        SV_TYPE y_vec = svld1(pg, y + i);
        y_vec = svmla_m(pg, y_vec, a00_vec, x0_vec);
        y_vec = svmla_m(pg, y_vec, a01_vec, x1_vec);
        y_vec = svmla_m(pg, y_vec, a02_vec, x2_vec);

        ix += inc_x;

        svst1(pg, y + i, y_vec);
      }

      a0_ptr += lda;
      a1_ptr += lda;
      a2_ptr += lda;
    }

    a_ptr = a2_ptr;
    for (j = width * 3; j < n; j++) {
      ix = j * inc_x;
      for (i = 0; (i + sve_size - 1) < m; i += sve_size) {
        SV_TYPE y_vec = svld1(pg_true, y + i);
        SV_TYPE x_vec = SV_DUP(alpha * x[(ix)]);
        SV_TYPE a_vec = svld1(pg_true, a_ptr + i);
        y_vec = svmla_x(pg_true, y_vec, a_vec, x_vec);
        svst1(pg_true, y + i, y_vec);
      }

      if (i < m) {
        SV_TYPE y_vec = svld1(pg, y + i);
        SV_TYPE x_vec = SV_DUP(alpha * x[(ix)]);
        SV_TYPE a_vec = svld1(pg, a_ptr + i);
        y_vec = svmla_m(pg, y_vec, a_vec, x_vec);
        svst1(pg, y + i, y_vec);
      }

      a_ptr += lda;
      ix += inc_x;
    }
    return (0);
  }

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