OpenBLAS/kernel/arm64/gemv_t_sve_v1x3.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 *y_ptr;
  FLOAT temp;

  iy = 0;

  if (inc_x == 1) {
    BLASLONG width = n / 3;
    BLASLONG 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;

    FLOAT *y0_ptr = y + inc_y * width * 0;
    FLOAT *y1_ptr = y + inc_y * width * 1;
    FLOAT *y2_ptr = y + inc_y * width * 2;

    for (j = 0; j < width; j++) {
      SV_TYPE temp00_vec = SV_DUP(0.0);
      SV_TYPE temp01_vec = SV_DUP(0.0);
      SV_TYPE temp02_vec = SV_DUP(0.0);

      i = 0;
      while ((i + sve_size * 1 - 1) < m) {
        SV_TYPE x0_vec = svld1(pg_true, x + i);

        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);

        temp00_vec = svmla_x(pg_true, temp00_vec, a00_vec, x0_vec);
        temp01_vec = svmla_x(pg_true, temp01_vec, a01_vec, x0_vec);
        temp02_vec = svmla_x(pg_true, temp02_vec, a02_vec, x0_vec);

        i += sve_size * 1;
      }

      if (i < m) {
        SV_TYPE x0_vec = svld1(pg, x + i);

        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);

        temp00_vec = svmla_m(pg, temp00_vec, a00_vec, x0_vec);
        temp01_vec = svmla_m(pg, temp01_vec, a01_vec, x0_vec);
        temp02_vec = svmla_m(pg, temp02_vec, a02_vec, x0_vec);
      }

      y0_ptr[iy] += alpha * svaddv(pg_true, temp00_vec);
      y1_ptr[iy] += alpha * svaddv(pg_true, temp01_vec);
      y2_ptr[iy] += alpha * svaddv(pg_true, temp02_vec);

      iy += inc_y;

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

    a_ptr = a2_ptr;
    y_ptr = y2_ptr;
    for (j = width * 3; j < n; j++) {
      SV_TYPE temp_vec = SV_DUP(0.0);

      i = 0;
      while ((i + sve_size * 1 - 1) < m) {
        SV_TYPE x_vec = svld1(pg_true, x + i);

        SV_TYPE a_vec = svld1(pg_true, a_ptr + i);

        temp_vec = svmla_x(pg_true, temp_vec, a_vec, x_vec);

        i += sve_size * 1;
      }

      if (i < m) {
        SV_TYPE x_vec = svld1(pg, x + i);

        SV_TYPE a_vec = svld1(pg, a_ptr + i);

        temp_vec = svmla_m(pg, temp_vec, a_vec, x_vec);
      }

      y_ptr[iy] += alpha * svaddv(pg_true, temp_vec);

      iy += inc_y;

      a_ptr += lda;
    }

    return(0);
  }

  a_ptr = a;
  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);
}