// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree.

$assert CHANNEL_TILE >= 1
#include <assert.h>

#include "xnnpack/common.h"
#include "xnnpack/math.h"
#include "xnnpack/reduce.h"


void xnn_qs8_rsum_ukernel__scalar_u${CHANNEL_TILE}(
    size_t batch,
    const int8_t* restrict input,
    int32_t* restrict output,
    const struct xnn_qs8_rsum_params params[restrict XNN_MIN_ELEMENTS(1)])
{
  assert(batch != 0);
  assert(input != NULL);
  assert(output != NULL);
  assert(params != NULL);

  $for A in range(ACCUMULATORS):
    int32_t vacc${A} = 0;
  $if CHANNEL_TILE == 1:
    do {
      const int32_t vt = (int32_t) *input++;
      vacc0 += vt;
      batch -= sizeof(int8_t);
    } while (batch != 0);
  $else:
    for (; batch >= ${CHANNEL_TILE}; batch -= ${CHANNEL_TILE}) {
      $for N in range(CHANNEL_TILE):
        const int32_t vt${N} = (int32_t) input[${N}];
      input += ${CHANNEL_TILE};

      $for N in range(CHANNEL_TILE):
        vacc${N % ACCUMULATORS} += vt${N};
    }
    $if ACCUMULATORS > 1:
      $ACC_SLICE = 1
      $while ACC_SLICE < ACCUMULATORS:
        $for A in range(0, ACCUMULATORS, ACC_SLICE * 2):
          $if A + ACC_SLICE < ACCUMULATORS:
            vacc${A} += vacc${A + ACC_SLICE};
        $ACC_SLICE *= 2

    if XNN_UNLIKELY(batch != 0) {
      $if CHANNEL_TILE == 2:
        const int32_t vt = (int32_t) *input;
        vacc0 += vt;
      $else:
        do {
          const int32_t vt = (int32_t) *input++;
          vacc0 += vt;
          batch -= sizeof(int8_t);
        } while (batch != 0);
    }

  *output += vacc0;
}