OpenBLAS/kernel/arm64/axpy_sve.c

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#include <arm_sve.h>

#include "common.h"

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

int CNAME(BLASLONG n, BLASLONG dummy0, BLASLONG dummy1, FLOAT da, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT *dummy, BLASLONG dummy2) {
  BLASLONG i = 0;
  BLASLONG ix = 0, iy = 0;
  BLASLONG sve_size = SV_COUNT();

  if (n < 0) return (0);
  if (da == 0.0) return (0);

  if (inc_x == 1 && inc_y == 1) {
    SV_TYPE da_vec = SV_DUP(da);
    for (i = 0; i + sve_size - 1 < n; i += sve_size) {
      SV_TYPE x_vec = svld1(SV_TRUE(), &x[i]);
      SV_TYPE y_vec = svld1(SV_TRUE(), &y[i]);
      y_vec = svmla_x(SV_TRUE(), y_vec, da_vec, x_vec);
      svst1(SV_TRUE(), &y[i], y_vec);
    }

    if (i < n) {
      svbool_t pg = SV_WHILE(i, n);
      SV_TYPE x_vec = svld1(pg, &x[i]);
      SV_TYPE y_vec = svld1(pg, &y[i]);
      y_vec = svmla_x(pg, y_vec, da_vec, x_vec);
      svst1(pg, &y[i], y_vec);
    }
    return (0);
  }

  while (i < n) {
    y[iy] += da * x[ix];
    ix += inc_x;
    iy += inc_y;
    i++;
  }

  return (0);
}