/* Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License. */

#ifdef POOL_OP

#if defined(__ARM_NEON) || defined(__ARM_NEON__)

#include <arm_neon.h>
#include "operators/math/pooling.h"

namespace paddle_mobile {
namespace operators {
namespace math {

#define POOLING3X3_NORMAL_BORDER(start, end)                   \
  for (int w = start; w < end; ++w) {                          \
    const int w_in_start = -padding_w + w * Stride;            \
    const int w_in_end = w_in_start + 3;                       \
    const int w_start = w_in_start > 0 ? w_in_start : 0;       \
    const int w_end = w_in_end < input_w ? w_in_end : input_w; \
    PoolingVal<P> val;                                         \
    for (int h_in = h_start; h_in < h_end; ++h_in) {           \
      for (int w_in = w_start; w_in < w_end; ++w_in) {         \
        val += input[h_in * input_w + w_in];                   \
      }                                                        \
    }                                                          \
    output_ptr[w] = val.Value();                               \
  }

template <PoolingType P, int Stride = 1>
struct Pooling3x3NormalRowLoadInput {
  inline void operator()(const float *input, float32x4x2_t &x0,  // NOLINT
                         float32x4x2_t &x1, float32x4x2_t &x2,   // NOLINT
                         float32x4x2_t &y0) {                    // NOLINT
    x0.val[0] = vld1q_f32(input);
    x0.val[1] = vld1q_f32(input + 4);
    x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
    x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
    x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
    x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
    y0.val[0] = vPoolPreq_f32<P>(x0.val[0], y0.val[0]);
    y0.val[1] = vPoolPreq_f32<P>(x0.val[1], y0.val[1]);
    y0.val[0] = vPoolPreq_f32<P>(x1.val[0], y0.val[0]);
    y0.val[1] = vPoolPreq_f32<P>(x1.val[1], y0.val[1]);
    y0.val[0] = vPoolPreq_f32<P>(x2.val[0], y0.val[0]);
    y0.val[1] = vPoolPreq_f32<P>(x2.val[1], y0.val[1]);
  }
};

template <PoolingType P>
struct Pooling3x3NormalRowLoadInput<P, 2> {
  inline void operator()(const float *input, float32x4x2_t &x0,  // NOLINT
                         float32x4x2_t &x1, float32x4x2_t &x2,   // NOLINT
                         float32x4x2_t &y0) {                    // NOLINT
    x0 = vld2q_f32(input);
    x1 = vld2q_f32(input + 8);
    x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
    x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
    x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
    x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
    x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
    x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
    y0.val[0] = vPoolPreq_f32<P>(x0.val[0], y0.val[0]);
    y0.val[1] = vPoolPreq_f32<P>(x0.val[1], y0.val[1]);
  }
};

template <PoolingType P, int Stride>
inline void Pooling3x3NormalRow(const float *input, const int h_output,
                                const int input_h, const int input_w,
                                const int padding_h, const int padding_w,
                                const int output_w, float *output) {
  const int h_in_start = -padding_h + h_output * Stride;
  const int h_in_end = h_in_start + 3;
  const int h_start = h_in_start > 0 ? h_in_start : 0;
  const int h_end = h_in_end < input_h ? h_in_end : input_h;

  float *output_ptr = output + h_output * output_w;
  if (h_end - h_start <= 0) {
    memset(output_ptr, 0, output_w * sizeof(float));
    return;
  }

  const int valid_w_start = (padding_w + Stride - 1) / Stride;
  const int valid_w_end = (input_w + padding_w - 3) / Stride + 1;
  const int valid_w = valid_w_end - valid_w_start;

  // border left
  POOLING3X3_NORMAL_BORDER(0, valid_w_start)
  // middle
  int output_tiles = (valid_w_end - valid_w_start) / 6;
  int output_tiles_w = output_tiles * 6;
  Pooling3x3NormalRowLoadInput<P, Stride> PoolingCompute;
  float32x4x2_t x0, x1, x2, y0;
  float32x4_t post = vdupq_n_f32(1.f / (3 * (h_end - h_start)));
  for (int w = 0; w < output_tiles_w; w += 6) {
    int output_offset = valid_w_start + w;
    int input_w_offset = output_offset * Stride - padding_w;
    y0.val[0] = vPoolInitq_f32<P>();
    y0.val[1] = vPoolInitq_f32<P>();
    for (int h_in = h_start; h_in < h_end; ++h_in) {
      PoolingCompute(input + h_in * input_w + input_w_offset, x0, x1, x2, y0);
    }
    y0.val[0] = vPoolPostq_f32<P>(y0.val[0], post);
    y0.val[1] = vPoolPostq_f32<P>(y0.val[1], post);
    vst1q_f32(output_ptr + output_offset, y0.val[0]);
    vst1_f32(output_ptr + output_offset + 4, vget_low_f32(y0.val[1]));
  }
  int remain = valid_w - output_tiles_w;
  if (remain > 0) {
    int remain_start = valid_w_start + output_tiles_w;
    int input_w_offset = remain_start * Stride - padding_w;
    float *output_ptr0 = output_ptr + remain_start;
    y0.val[0] = vPoolInitq_f32<P>();
    y0.val[1] = vPoolInitq_f32<P>();
    for (int h_in = h_start; h_in < h_end; ++h_in) {
      PoolingCompute(input + h_in * input_w + input_w_offset, x0, x1, x2, y0);
    }
    y0.val[0] = vPoolPostq_f32<P>(y0.val[0], post);
    y0.val[1] = vPoolPostq_f32<P>(y0.val[1], post);
    switch (remain) {
      case 1:
        vst1q_lane_f32(output_ptr0, y0.val[0], 0);
        break;
      case 2:
        vst1_f32(output_ptr0, vget_low_f32(y0.val[0]));
        break;
      case 3:
        vst1_f32(output_ptr0, vget_low_f32(y0.val[0]));
        vst1q_lane_f32(output_ptr0 + 2, y0.val[0], 2);
        break;
      case 4:
        vst1q_f32(output_ptr0, y0.val[0]);
        break;
      case 5:
        vst1q_f32(output_ptr0, y0.val[0]);
        vst1q_lane_f32(output_ptr0 + 4, y0.val[1], 0);
        break;
    }
  }
  // border right
  POOLING3X3_NORMAL_BORDER(valid_w_end, output_w)
}

template <PoolingType P>
struct Pooling3x3<P, 1> {
  inline void operator()(const framework::Tensor &input,
                         const std::vector<int> &paddings,
                         framework::Tensor *output) {
    const float *input_data = input.data<float>();
    float *output_data = output->mutable_data<float>();
    int input_h = input.dims()[2];
    int input_w = input.dims()[3];
    int output_h = output->dims()[2];
    int output_w = output->dims()[3];
    int padding_h = paddings[0];
    int padding_w = paddings[1];
    int image_size = input_h * input_w;
    int out_image_size = output_h * output_w;
    int valid_h_start = padding_h;
    int valid_h = input_h - 2;
    int valid_h_end = valid_h_start + valid_h;
    int valid_w_start = padding_w;
    int valid_w = input_w - 2;
    int valid_w_end = valid_w_start + valid_w;

    #pragma omp parallel for collapse(2)
    for (int batch = 0; batch < output->dims()[0]; ++batch) {
      for (int c = 0; c < output->dims()[1]; ++c) {
        int channel = batch * output->dims()[1] + c;
        const float *input_ptr = input_data + channel * image_size;
        float *output_ptr = output_data + channel * out_image_size;
        // top
        for (int h = 0; h < valid_h_start; ++h) {
          Pooling3x3NormalRow<P, 1>(input_ptr, h, input_h, input_w, padding_h,
                                    padding_w, output_w, output_ptr);
        }
        // valid
        int output_w_tiles = valid_w / 6;
        int output_w_remain = valid_w - output_w_tiles * 6;
        for (int h = valid_h_start; h < valid_h_end - 3; h += 4) {
          const float *input_ptr0 = input_ptr + (h - padding_h) * input_w;
          const float *input_ptr1 = input_ptr0 + input_w;
          const float *input_ptr2 = input_ptr1 + input_w;
          const float *input_ptr3 = input_ptr2 + input_w;
          const float *input_ptr4 = input_ptr3 + input_w;
          const float *input_ptr5 = input_ptr4 + input_w;
          float *output_ptr0 = output_ptr + h * output_w;
          float *output_ptr1 = output_ptr0 + output_w;
          float *output_ptr2 = output_ptr1 + output_w;
          float *output_ptr3 = output_ptr2 + output_w;
          // pad left
          if (padding_w) {
            float32x2_t row0 = vld1_f32(input_ptr0);
            float32x2_t row1 = vld1_f32(input_ptr1);
            float32x2_t row2 = vld1_f32(input_ptr2);
            float32x2_t row3 = vld1_f32(input_ptr3);
            float32x2_t row4 = vld1_f32(input_ptr4);
            float32x2_t row5 = vld1_f32(input_ptr5);
            float32x2_t pad0 = vPoolInit_f32<P>();
            float32x2_t acc0, acc1, acc2, acc3, acc12, acc34, post;
            for (int w = valid_w_start - 1; w >= 0; --w) {
              int padding = padding_w - w;
              if (padding >= 3) {
                output_ptr0[w] = 0.f;
                output_ptr1[w] = 0.f;
                output_ptr2[w] = 0.f;
                output_ptr3[w] = 0.f;
              } else {
                post = vdup_n_f32(1.f / (3 * (3 - padding)));
                acc12 = vPoolPre_f32<P>(row1, row2);
                acc34 = vPoolPre_f32<P>(row3, row4);
                acc0 = vPoolPre_f32<P>(row0, acc12);
                acc1 = vPoolPre_f32<P>(row3, acc12);
                acc2 = vPoolPre_f32<P>(row2, acc34);
                acc3 = vPoolPre_f32<P>(row5, acc34);
                acc0 = vpPoolPre_f32<P>(acc0, acc0);
                acc1 = vpPoolPre_f32<P>(acc1, acc1);
                acc2 = vpPoolPre_f32<P>(acc2, acc2);
                acc3 = vpPoolPre_f32<P>(acc3, acc3);
                acc0 = vPoolPost_f32<P>(acc0, post);
                acc1 = vPoolPost_f32<P>(acc1, post);
                acc2 = vPoolPost_f32<P>(acc2, post);
                acc3 = vPoolPost_f32<P>(acc3, post);
                vst1_lane_f32(output_ptr0 + w, acc0, 0);
                vst1_lane_f32(output_ptr1 + w, acc1, 0);
                vst1_lane_f32(output_ptr2 + w, acc2, 0);
                vst1_lane_f32(output_ptr3 + w, acc3, 0);
                row0 = vext_f32(pad0, row0, 1);
                row1 = vext_f32(pad0, row1, 1);
                row2 = vext_f32(pad0, row2, 1);
                row3 = vext_f32(pad0, row3, 1);
                row4 = vext_f32(pad0, row4, 1);
                row5 = vext_f32(pad0, row5, 1);
              }
            }
            output_ptr0 += valid_w_start;
            output_ptr1 += valid_w_start;
            output_ptr2 += valid_w_start;
            output_ptr3 += valid_w_start;
          }
          // valid
          float32x4x2_t x0, x1, x2;
          float32x4x2_t y0, y1, y2;
          float32x4_t post = vdupq_n_f32(1.f / 9);
          for (int loop = 0; loop < output_w_tiles; ++loop) {
            x0.val[0] = vld1q_f32(input_ptr0);
            x0.val[1] = vld1q_f32(input_ptr0 + 4);
            x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
            x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
            x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
            x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x1.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x1.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);

            x0.val[0] = vld1q_f32(input_ptr1);
            x0.val[1] = vld1q_f32(input_ptr1 + 4);
            x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
            x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
            x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
            x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x1.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x1.val[1]);
            y1.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            y1.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(y1.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(y1.val[1], y0.val[1]);

            x0.val[0] = vld1q_f32(input_ptr2);
            x0.val[1] = vld1q_f32(input_ptr2 + 4);
            x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
            x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
            x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
            x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x1.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x1.val[1]);
            y2.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            y2.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y1.val[0] = vPoolPreq_f32<P>(y2.val[0], y1.val[0]);
            y1.val[1] = vPoolPreq_f32<P>(y2.val[1], y1.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(y2.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(y2.val[1], y0.val[1]);
            y0.val[0] = vPoolPostq_f32<P>(y0.val[0], post);
            y0.val[1] = vPoolPostq_f32<P>(y0.val[1], post);
            vst1q_f32(output_ptr0, y0.val[0]);
            vst1_f32(output_ptr0 + 4, vget_low_f32(y0.val[1]));

            x0.val[0] = vld1q_f32(input_ptr3);
            x0.val[1] = vld1q_f32(input_ptr3 + 4);
            x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
            x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
            x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
            x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x1.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x1.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y1.val[0] = vPoolPreq_f32<P>(y0.val[0], y1.val[0]);
            y1.val[1] = vPoolPreq_f32<P>(y0.val[1], y1.val[1]);
            y2.val[0] = vPoolPreq_f32<P>(y0.val[0], y2.val[0]);
            y2.val[1] = vPoolPreq_f32<P>(y0.val[1], y2.val[1]);
            y1.val[0] = vPoolPostq_f32<P>(y1.val[0], post);
            y1.val[1] = vPoolPostq_f32<P>(y1.val[1], post);
            vst1q_f32(output_ptr1, y1.val[0]);
            vst1_f32(output_ptr1 + 4, vget_low_f32(y1.val[1]));

            x0.val[0] = vld1q_f32(input_ptr4);
            x0.val[1] = vld1q_f32(input_ptr4 + 4);
            x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
            x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
            x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
            x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x1.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], y0.val[1]);
            y2.val[0] = vPoolPreq_f32<P>(x0.val[0], y2.val[0]);
            y2.val[1] = vPoolPreq_f32<P>(x0.val[1], y2.val[1]);
            y2.val[0] = vPoolPostq_f32<P>(y2.val[0], post);
            y2.val[1] = vPoolPostq_f32<P>(y2.val[1], post);
            vst1q_f32(output_ptr2, y2.val[0]);
            vst1_f32(output_ptr2 + 4, vget_low_f32(y2.val[1]));

            x0.val[0] = vld1q_f32(input_ptr5);
            x0.val[1] = vld1q_f32(input_ptr5 + 4);
            x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
            x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
            x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
            x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x1.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], y0.val[1]);
            y0.val[0] = vPoolPostq_f32<P>(y0.val[0], post);
            y0.val[1] = vPoolPostq_f32<P>(y0.val[1], post);
            vst1q_f32(output_ptr3, y0.val[0]);
            vst1_f32(output_ptr3 + 4, vget_low_f32(y0.val[1]));

            input_ptr0 += 6;
            input_ptr1 += 6;
            input_ptr2 += 6;
            input_ptr3 += 6;
            input_ptr4 += 6;
            input_ptr5 += 6;
            output_ptr0 += 6;
            output_ptr1 += 6;
            output_ptr2 += 6;
            output_ptr3 += 6;
          }
          // remain width
          if (output_w_remain > 0) {
            float32x4x2_t y3;
            x0.val[0] = vld1q_f32(input_ptr0);
            x0.val[1] = vld1q_f32(input_ptr0 + 4);
            x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
            x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
            x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
            x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x1.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x1.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);

            x0.val[0] = vld1q_f32(input_ptr1);
            x0.val[1] = vld1q_f32(input_ptr1 + 4);
            x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
            x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
            x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
            x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x1.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x1.val[1]);
            y1.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            y1.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(y1.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(y1.val[1], y0.val[1]);

            x0.val[0] = vld1q_f32(input_ptr2);
            x0.val[1] = vld1q_f32(input_ptr2 + 4);
            x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
            x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
            x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
            x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x1.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x1.val[1]);
            y2.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            y2.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y1.val[0] = vPoolPreq_f32<P>(y2.val[0], y1.val[0]);
            y1.val[1] = vPoolPreq_f32<P>(y2.val[1], y1.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(y2.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(y2.val[1], y0.val[1]);
            y0.val[0] = vPoolPostq_f32<P>(y0.val[0], post);
            y0.val[1] = vPoolPostq_f32<P>(y0.val[1], post);

            x0.val[0] = vld1q_f32(input_ptr3);
            x0.val[1] = vld1q_f32(input_ptr3 + 4);
            x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
            x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
            x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
            x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x1.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x1.val[1]);
            y3.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            y3.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y1.val[0] = vPoolPreq_f32<P>(y3.val[0], y1.val[0]);
            y1.val[1] = vPoolPreq_f32<P>(y3.val[1], y1.val[1]);
            y2.val[0] = vPoolPreq_f32<P>(y3.val[0], y2.val[0]);
            y2.val[1] = vPoolPreq_f32<P>(y3.val[1], y2.val[1]);
            y1.val[0] = vPoolPostq_f32<P>(y1.val[0], post);
            y1.val[1] = vPoolPostq_f32<P>(y1.val[1], post);

            x0.val[0] = vld1q_f32(input_ptr4);
            x0.val[1] = vld1q_f32(input_ptr4 + 4);
            x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
            x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
            x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
            x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x1.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y3.val[0] = vPoolPreq_f32<P>(x0.val[0], y3.val[0]);
            y3.val[1] = vPoolPreq_f32<P>(x0.val[1], y3.val[1]);
            y2.val[0] = vPoolPreq_f32<P>(x0.val[0], y2.val[0]);
            y2.val[1] = vPoolPreq_f32<P>(x0.val[1], y2.val[1]);
            y2.val[0] = vPoolPostq_f32<P>(y2.val[0], post);
            y2.val[1] = vPoolPostq_f32<P>(y2.val[1], post);

            x0.val[0] = vld1q_f32(input_ptr5);
            x0.val[1] = vld1q_f32(input_ptr5 + 4);
            x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
            x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
            x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
            x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x1.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y3.val[0] = vPoolPreq_f32<P>(x0.val[0], y3.val[0]);
            y3.val[1] = vPoolPreq_f32<P>(x0.val[1], y3.val[1]);
            y3.val[0] = vPoolPostq_f32<P>(y3.val[0], post);
            y3.val[1] = vPoolPostq_f32<P>(y3.val[1], post);

            switch (output_w_remain) {
              case 1:
                vst1q_lane_f32(output_ptr0, y0.val[0], 0);
                vst1q_lane_f32(output_ptr1, y1.val[0], 0);
                vst1q_lane_f32(output_ptr2, y2.val[0], 0);
                vst1q_lane_f32(output_ptr3, y3.val[0], 0);
                break;
              case 2:
                vst1_f32(output_ptr0, vget_low_f32(y0.val[0]));
                vst1_f32(output_ptr1, vget_low_f32(y1.val[0]));
                vst1_f32(output_ptr2, vget_low_f32(y2.val[0]));
                vst1_f32(output_ptr3, vget_low_f32(y3.val[0]));
                break;
              case 3:
                vst1_f32(output_ptr0, vget_low_f32(y0.val[0]));
                vst1_f32(output_ptr1, vget_low_f32(y1.val[0]));
                vst1_f32(output_ptr2, vget_low_f32(y2.val[0]));
                vst1_f32(output_ptr3, vget_low_f32(y3.val[0]));
                vst1q_lane_f32(output_ptr0 + 2, y0.val[0], 2);
                vst1q_lane_f32(output_ptr1 + 2, y1.val[0], 2);
                vst1q_lane_f32(output_ptr2 + 2, y2.val[0], 2);
                vst1q_lane_f32(output_ptr3 + 2, y3.val[0], 2);
                break;
              case 4:
                vst1q_f32(output_ptr0, y0.val[0]);
                vst1q_f32(output_ptr1, y1.val[0]);
                vst1q_f32(output_ptr2, y2.val[0]);
                vst1q_f32(output_ptr3, y3.val[0]);
                break;
              case 5:
                vst1q_f32(output_ptr0, y0.val[0]);
                vst1q_f32(output_ptr1, y1.val[0]);
                vst1q_f32(output_ptr2, y2.val[0]);
                vst1q_f32(output_ptr3, y3.val[0]);
                vst1q_lane_f32(output_ptr0 + 4, y0.val[1], 0);
                vst1q_lane_f32(output_ptr1 + 4, y1.val[1], 0);
                vst1q_lane_f32(output_ptr2 + 4, y2.val[1], 0);
                vst1q_lane_f32(output_ptr3 + 4, y3.val[1], 0);
                break;
            }
            input_ptr0 += output_w_remain;
            input_ptr1 += output_w_remain;
            input_ptr2 += output_w_remain;
            input_ptr3 += output_w_remain;
            input_ptr4 += output_w_remain;
            input_ptr5 += output_w_remain;
            output_ptr0 += output_w_remain;
            output_ptr1 += output_w_remain;
            output_ptr2 += output_w_remain;
            output_ptr3 += output_w_remain;
          }
          // pad right
          if (padding_w) {
            float32x2_t row0 = vld1_f32(input_ptr0);
            float32x2_t row1 = vld1_f32(input_ptr1);
            float32x2_t row2 = vld1_f32(input_ptr2);
            float32x2_t row3 = vld1_f32(input_ptr3);
            float32x2_t row4 = vld1_f32(input_ptr4);
            float32x2_t row5 = vld1_f32(input_ptr5);
            float32x2_t pad0 = vPoolInit_f32<P>();
            float32x2_t acc0, acc1, acc2, acc3, acc12, acc34, post;
            for (int w = valid_w_end; w < output_w; ++w) {
              int padding = w + 3 - (padding_w + input_w);
              if (padding >= 3) {
                *output_ptr0 = 0.f;
                *output_ptr1 = 0.f;
                *output_ptr2 = 0.f;
                *output_ptr3 = 0.f;
              } else {
                post = vdup_n_f32(1.f / (3 * (3 - padding)));
                acc12 = vPoolPre_f32<P>(row1, row2);
                acc34 = vPoolPre_f32<P>(row3, row4);
                acc0 = vPoolPre_f32<P>(row0, acc12);
                acc1 = vPoolPre_f32<P>(row3, acc12);
                acc2 = vPoolPre_f32<P>(row2, acc34);
                acc3 = vPoolPre_f32<P>(row5, acc34);
                acc0 = vpPoolPre_f32<P>(acc0, acc0);
                acc1 = vpPoolPre_f32<P>(acc1, acc1);
                acc2 = vpPoolPre_f32<P>(acc2, acc2);
                acc3 = vpPoolPre_f32<P>(acc3, acc3);
                acc0 = vPoolPost_f32<P>(acc0, post);
                acc1 = vPoolPost_f32<P>(acc1, post);
                acc2 = vPoolPost_f32<P>(acc2, post);
                acc3 = vPoolPost_f32<P>(acc3, post);
                vst1_lane_f32(output_ptr0, acc0, 0);
                vst1_lane_f32(output_ptr1, acc1, 0);
                vst1_lane_f32(output_ptr2, acc2, 0);
                vst1_lane_f32(output_ptr3, acc3, 0);
                row0 = vext_f32(row0, pad0, 1);
                row1 = vext_f32(row1, pad0, 1);
                row2 = vext_f32(row2, pad0, 1);
                row3 = vext_f32(row3, pad0, 1);
                row4 = vext_f32(row4, pad0, 1);
                row5 = vext_f32(row5, pad0, 1);
              }
              output_ptr0++;
              output_ptr1++;
              output_ptr2++;
              output_ptr3++;
            }
          }
        }
        // remain height
        int start_h = valid_h_start + (valid_h & 0xFFFC);
        for (int h = start_h; h < valid_h_end; ++h) {
          const float *input_ptr0 = input_ptr + (h - padding_h) * input_w;
          const float *input_ptr1 = input_ptr0 + input_w;
          const float *input_ptr2 = input_ptr1 + input_w;
          float *output_ptr0 = output_ptr + h * output_w;
          // pad left
          if (padding_w) {
            float32x2_t row0 = vld1_f32(input_ptr0);
            float32x2_t row1 = vld1_f32(input_ptr1);
            float32x2_t row2 = vld1_f32(input_ptr2);
            float32x2_t pad0 = vPoolInit_f32<P>();
            float32x2_t acc0, post;
            for (int w = valid_w_start - 1; w >= 0; --w) {
              int padding = padding_w - w;
              if (padding >= 3) {
                output_ptr0[w] = 0.f;
              } else {
                post = vdup_n_f32(1.f / (3 * (3 - padding)));
                acc0 = vPoolPre_f32<P>(row0, row1);
                acc0 = vPoolPre_f32<P>(acc0, row2);
                acc0 = vpPoolPre_f32<P>(acc0, acc0);
                acc0 = vPoolPost_f32<P>(acc0, post);
                vst1_lane_f32(output_ptr0 + w, acc0, 0);
                row0 = vext_f32(pad0, row0, 1);
                row1 = vext_f32(pad0, row1, 1);
                row2 = vext_f32(pad0, row2, 1);
              }
            }
            output_ptr0 += valid_w_start;
          }
          // valid
          float32x4x2_t x0, x1, x2, y0;
          float32x4_t post = vdupq_n_f32(1.f / 9);
          for (int loop = 0; loop < output_w_tiles; ++loop) {
            x0.val[0] = vld1q_f32(input_ptr0);
            x0.val[1] = vld1q_f32(input_ptr0 + 4);
            x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
            x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
            x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
            x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x1.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x1.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);

            x0.val[0] = vld1q_f32(input_ptr1);
            x0.val[1] = vld1q_f32(input_ptr1 + 4);
            x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
            x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
            x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
            x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x1.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], y0.val[1]);

            x0.val[0] = vld1q_f32(input_ptr2);
            x0.val[1] = vld1q_f32(input_ptr2 + 4);
            x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
            x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
            x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
            x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x1.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], y0.val[1]);
            y0.val[0] = vPoolPostq_f32<P>(y0.val[0], post);
            y0.val[1] = vPoolPostq_f32<P>(y0.val[1], post);
            vst1q_f32(output_ptr0, y0.val[0]);
            vst1_f32(output_ptr0 + 4, vget_low_f32(y0.val[1]));

            input_ptr0 += 6;
            input_ptr1 += 6;
            input_ptr2 += 6;
            output_ptr0 += 6;
          }
          // remain width
          if (output_w_remain > 0) {
            x0.val[0] = vld1q_f32(input_ptr0);
            x0.val[1] = vld1q_f32(input_ptr0 + 4);
            x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
            x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
            x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
            x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x1.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x1.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);

            x0.val[0] = vld1q_f32(input_ptr1);
            x0.val[1] = vld1q_f32(input_ptr1 + 4);
            x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
            x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
            x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
            x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x1.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], y0.val[1]);

            x0.val[0] = vld1q_f32(input_ptr2);
            x0.val[1] = vld1q_f32(input_ptr2 + 4);
            x1.val[0] = vextq_f32(x0.val[0], x0.val[1], 1);
            x1.val[1] = vextq_f32(x0.val[1], x0.val[1], 1);
            x2.val[0] = vextq_f32(x0.val[0], x0.val[1], 2);
            x2.val[1] = vextq_f32(x0.val[1], x0.val[1], 2);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x1.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], y0.val[1]);
            y0.val[0] = vPoolPostq_f32<P>(y0.val[0], post);
            y0.val[1] = vPoolPostq_f32<P>(y0.val[1], post);
            // restore
            switch (output_w_remain) {
              case 1:
                vst1q_lane_f32(output_ptr0, y0.val[0], 0);
                break;
              case 2:
                vst1_f32(output_ptr0, vget_low_f32(y0.val[0]));
                break;
              case 3:
                vst1_f32(output_ptr0, vget_low_f32(y0.val[0]));
                vst1q_lane_f32(output_ptr0 + 2, y0.val[0], 2);
                break;
              case 4:
                vst1q_f32(output_ptr0, y0.val[0]);
                break;
              case 5:
                vst1q_f32(output_ptr0, y0.val[0]);
                vst1q_lane_f32(output_ptr0 + 4, y0.val[1], 0);
                break;
            }
            input_ptr0 += output_w_remain;
            input_ptr1 += output_w_remain;
            input_ptr2 += output_w_remain;
            output_ptr0 += output_w_remain;
          }
          // pad right
          if (padding_w) {
            float32x2_t row0 = vld1_f32(input_ptr0);
            float32x2_t row1 = vld1_f32(input_ptr1);
            float32x2_t row2 = vld1_f32(input_ptr2);
            float32x2_t pad0 = vPoolInit_f32<P>();
            float32x2_t acc0, post;
            for (int w = valid_w_end; w < output_w; ++w) {
              int padding = w + 3 - (padding_w + input_w);
              if (padding >= 3) {
                *output_ptr0 = 0.f;
              } else {
                post = vdup_n_f32(1.f / (3 * (3 - padding)));
                acc0 = vPoolPre_f32<P>(row0, row1);
                acc0 = vPoolPre_f32<P>(acc0, row2);
                acc0 = vpPoolPre_f32<P>(acc0, acc0);
                acc0 = vPoolPost_f32<P>(acc0, post);
                vst1_lane_f32(output_ptr0, acc0, 0);
                row0 = vext_f32(row0, pad0, 1);
                row1 = vext_f32(row1, pad0, 1);
                row2 = vext_f32(row2, pad0, 1);
              }
              output_ptr0++;
            }
          }
        }
        // pad bottom
        for (int h = valid_h_end; h < output_h; ++h) {
          Pooling3x3NormalRow<P, 1>(input_ptr, h, input_h, input_w, padding_h,
                                    padding_w, output_w, output_ptr);
        }
      }
    }
  }
};

template <PoolingType P>
struct Pooling3x3<P, 2> {
  inline void operator()(const framework::Tensor &input,
                         const std::vector<int> &paddings,
                         framework::Tensor *output) {
    const float *input_data = input.data<float>();
    float *output_data = output->mutable_data<float>();
    int input_h = input.dims()[2];
    int input_w = input.dims()[3];
    int output_h = output->dims()[2];
    int output_w = output->dims()[3];
    int padding_h = paddings[0];
    int padding_w = paddings[1];
    int image_size = input_h * input_w;
    int out_image_size = output_h * output_w;
    int valid_h_start = (padding_h + 1) / 2;
    int valid_h_end = (input_h + padding_h - 1) / 2;
    int valid_h = valid_h_end - valid_h_start;
    int valid_w_start = (padding_w + 1) / 2;
    int valid_w_end = (input_w + padding_w - 1) / 2;
    int valid_w = valid_w_end - valid_w_start;

    int padding_height = input_h + 2 * padding_h;
    int padding_width = input_w + 2 * padding_w;
    bool ceil_mode = (((padding_height - 1) / 2) < output_h) ||
                     (((padding_width - 1) / 2) < output_w);
    int padding_b =
        padding_h + (ceil_mode ? 2 * output_h - (padding_height - 1) : 0);
    int padding_r =
        padding_w + (ceil_mode ? 2 * output_w - (padding_width - 1) : 0);
    // for pad left
    int valid_input_w_start = (valid_w_start << 1) - padding_w;

    #pragma omp parallel for collapse(2)
    for (int batch = 0; batch < output->dims()[0]; ++batch) {
      for (int c = 0; c < output->dims()[1]; ++c) {
        int channel = batch * output->dims()[1] + c;
        const float *input_ptr = input_data + channel * image_size;
        float *output_ptr = output_data + channel * out_image_size;
        // top
        for (int h = 0; h < valid_h_start; ++h) {
          Pooling3x3NormalRow<P, 2>(input_ptr, h, input_h, input_w, padding_h,
                                    padding_w, output_w, output_ptr);
        }
        // valid
        int output_w_tiles = valid_w / 6;
        int output_w_remain = valid_w - output_w_tiles * 6;
        for (int h = valid_h_start; h < valid_h_end - 2; h += 3) {
          const float *input_ptr0 = input_ptr + (2 * h - padding_h) * input_w;
          const float *input_ptr1 = input_ptr0 + input_w;
          const float *input_ptr2 = input_ptr1 + input_w;
          const float *input_ptr3 = input_ptr2 + input_w;
          const float *input_ptr4 = input_ptr3 + input_w;
          const float *input_ptr5 = input_ptr4 + input_w;
          const float *input_ptr6 = input_ptr5 + input_w;
          float *output_ptr0 = output_ptr + h * output_w;
          float *output_ptr1 = output_ptr0 + output_w;
          float *output_ptr2 = output_ptr1 + output_w;
          // pad left
          if (padding_w) {
            float32x2_t row0 = vld1_f32(input_ptr0);
            float32x2_t row1 = vld1_f32(input_ptr1);
            float32x2_t row2 = vld1_f32(input_ptr2);
            float32x2_t row3 = vld1_f32(input_ptr3);
            float32x2_t row4 = vld1_f32(input_ptr4);
            float32x2_t row5 = vld1_f32(input_ptr5);
            float32x2_t row6 = vld1_f32(input_ptr6);
            float32x2_t pad0 = vPoolInit_f32<P>();
            float32x2_t acc0, acc1, acc2, post;
            for (int w = valid_w_start - 1; w >= 0; --w) {
              int padding = padding_w - (w << 1);
              if (padding >= 3) {
                output_ptr0[w] = 0.f;
                output_ptr1[w] = 0.f;
                output_ptr2[w] = 0.f;
              } else {
                post = vdup_n_f32(1.f / (3 * (3 - padding)));
                acc0 = vPoolPre_f32<P>(row0, row1);
                acc1 = vPoolPre_f32<P>(row2, row3);
                acc2 = vPoolPre_f32<P>(row4, row5);
                acc0 = vPoolPre_f32<P>(acc0, row2);
                acc1 = vPoolPre_f32<P>(acc1, row4);
                acc2 = vPoolPre_f32<P>(acc2, row6);
                if (padding == 1) {
                  acc0 = vpPoolPre_f32<P>(acc0, acc0);
                  acc1 = vpPoolPre_f32<P>(acc1, acc1);
                  acc2 = vpPoolPre_f32<P>(acc2, acc2);
                }
                acc0 = vPoolPost_f32<P>(acc0, post);
                acc1 = vPoolPost_f32<P>(acc1, post);
                acc2 = vPoolPost_f32<P>(acc2, post);
                vst1_lane_f32(output_ptr0 + w, acc0, 0);
                vst1_lane_f32(output_ptr1 + w, acc1, 0);
                vst1_lane_f32(output_ptr2 + w, acc2, 0);
              }
            }
            input_ptr0 += valid_input_w_start;
            input_ptr1 += valid_input_w_start;
            input_ptr2 += valid_input_w_start;
            input_ptr3 += valid_input_w_start;
            input_ptr4 += valid_input_w_start;
            input_ptr5 += valid_input_w_start;
            input_ptr6 += valid_input_w_start;
            output_ptr0 += valid_w_start;
            output_ptr1 += valid_w_start;
            output_ptr2 += valid_w_start;
          }
          // valid
          float32x4x2_t x0, x1, x2;
          float32x4x2_t y0, y1, y2;
          float32x4_t post = vdupq_n_f32(1.f / 9);
          for (int loop = 0; loop < output_w_tiles; ++loop) {
            x0 = vld2q_f32(input_ptr0);
            x1 = vld2q_f32(input_ptr0 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);

            x0 = vld2q_f32(input_ptr1);
            x1 = vld2q_f32(input_ptr1 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], y0.val[1]);

            x0 = vld2q_f32(input_ptr2);
            x1 = vld2q_f32(input_ptr2 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            y1.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            y1.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(y1.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(y1.val[1], y0.val[1]);
            y0.val[0] = vPoolPostq_f32<P>(y0.val[0], post);
            y0.val[1] = vPoolPostq_f32<P>(y0.val[1], post);
            vst1q_f32(output_ptr0, y0.val[0]);
            vst1_f32(output_ptr0 + 4, vget_low_f32(y0.val[1]));

            x0 = vld2q_f32(input_ptr3);
            x1 = vld2q_f32(input_ptr3 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y1.val[0] = vPoolPreq_f32<P>(x0.val[0], y1.val[0]);
            y1.val[1] = vPoolPreq_f32<P>(x0.val[1], y1.val[1]);

            x0 = vld2q_f32(input_ptr4);
            x1 = vld2q_f32(input_ptr4 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y1.val[0] = vPoolPreq_f32<P>(y0.val[0], y1.val[0]);
            y1.val[1] = vPoolPreq_f32<P>(y0.val[1], y1.val[1]);
            y1.val[0] = vPoolPostq_f32<P>(y1.val[0], post);
            y1.val[1] = vPoolPostq_f32<P>(y1.val[1], post);
            vst1q_f32(output_ptr1, y1.val[0]);
            vst1_f32(output_ptr1 + 4, vget_low_f32(y1.val[1]));

            x0 = vld2q_f32(input_ptr5);
            x1 = vld2q_f32(input_ptr5 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], y0.val[1]);

            x0 = vld2q_f32(input_ptr6);
            x1 = vld2q_f32(input_ptr6 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], y0.val[1]);
            y0.val[0] = vPoolPostq_f32<P>(y0.val[0], post);
            y0.val[1] = vPoolPostq_f32<P>(y0.val[1], post);
            vst1q_f32(output_ptr2, y0.val[0]);
            vst1_f32(output_ptr2 + 4, vget_low_f32(y0.val[1]));

            input_ptr0 += 12;
            input_ptr1 += 12;
            input_ptr2 += 12;
            input_ptr3 += 12;
            input_ptr4 += 12;
            input_ptr5 += 12;
            input_ptr6 += 12;
            output_ptr0 += 6;
            output_ptr1 += 6;
            output_ptr2 += 6;
          }
          // remain width
          if (output_w_remain > 0) {
            x0 = vld2q_f32(input_ptr0);
            x1 = vld2q_f32(input_ptr0 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);

            x0 = vld2q_f32(input_ptr1);
            x1 = vld2q_f32(input_ptr1 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], y0.val[1]);

            x0 = vld2q_f32(input_ptr2);
            x1 = vld2q_f32(input_ptr2 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            y1.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            y1.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(y1.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(y1.val[1], y0.val[1]);
            y0.val[0] = vPoolPostq_f32<P>(y0.val[0], post);
            y0.val[1] = vPoolPostq_f32<P>(y0.val[1], post);

            x0 = vld2q_f32(input_ptr3);
            x1 = vld2q_f32(input_ptr3 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y1.val[0] = vPoolPreq_f32<P>(x0.val[0], y1.val[0]);
            y1.val[1] = vPoolPreq_f32<P>(x0.val[1], y1.val[1]);

            x0 = vld2q_f32(input_ptr4);
            x1 = vld2q_f32(input_ptr4 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            y2.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            y2.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y1.val[0] = vPoolPreq_f32<P>(y2.val[0], y1.val[0]);
            y1.val[1] = vPoolPreq_f32<P>(y2.val[1], y1.val[1]);
            y1.val[0] = vPoolPostq_f32<P>(y1.val[0], post);
            y1.val[1] = vPoolPostq_f32<P>(y1.val[1], post);

            x0 = vld2q_f32(input_ptr5);
            x1 = vld2q_f32(input_ptr5 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y2.val[0] = vPoolPreq_f32<P>(x0.val[0], y2.val[0]);
            y2.val[1] = vPoolPreq_f32<P>(x0.val[1], y2.val[1]);

            x0 = vld2q_f32(input_ptr6);
            x1 = vld2q_f32(input_ptr6 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y2.val[0] = vPoolPreq_f32<P>(x0.val[0], y2.val[0]);
            y2.val[1] = vPoolPreq_f32<P>(x0.val[1], y2.val[1]);
            y2.val[0] = vPoolPostq_f32<P>(y2.val[0], post);
            y2.val[1] = vPoolPostq_f32<P>(y2.val[1], post);

            switch (output_w_remain) {
              case 1:
                vst1q_lane_f32(output_ptr0, y0.val[0], 0);
                vst1q_lane_f32(output_ptr1, y1.val[0], 0);
                vst1q_lane_f32(output_ptr2, y2.val[0], 0);
                break;
              case 2:
                vst1_f32(output_ptr0, vget_low_f32(y0.val[0]));
                vst1_f32(output_ptr1, vget_low_f32(y1.val[0]));
                vst1_f32(output_ptr2, vget_low_f32(y2.val[0]));
                break;
              case 3:
                vst1_f32(output_ptr0, vget_low_f32(y0.val[0]));
                vst1_f32(output_ptr1, vget_low_f32(y1.val[0]));
                vst1_f32(output_ptr2, vget_low_f32(y2.val[0]));
                vst1q_lane_f32(output_ptr0 + 2, y0.val[0], 2);
                vst1q_lane_f32(output_ptr1 + 2, y1.val[0], 2);
                vst1q_lane_f32(output_ptr2 + 2, y2.val[0], 2);
                break;
              case 4:
                vst1q_f32(output_ptr0, y0.val[0]);
                vst1q_f32(output_ptr1, y1.val[0]);
                vst1q_f32(output_ptr2, y2.val[0]);
                break;
              case 5:
                vst1q_f32(output_ptr0, y0.val[0]);
                vst1q_f32(output_ptr1, y1.val[0]);
                vst1q_f32(output_ptr2, y2.val[0]);
                vst1q_lane_f32(output_ptr0 + 4, y0.val[1], 0);
                vst1q_lane_f32(output_ptr1 + 4, y1.val[1], 0);
                vst1q_lane_f32(output_ptr2 + 4, y2.val[1], 0);
                break;
            }
            input_ptr0 += (output_w_remain << 1);
            input_ptr1 += (output_w_remain << 1);
            input_ptr2 += (output_w_remain << 1);
            input_ptr3 += (output_w_remain << 1);
            input_ptr4 += (output_w_remain << 1);
            input_ptr5 += (output_w_remain << 1);
            input_ptr6 += (output_w_remain << 1);
            output_ptr0 += output_w_remain;
            output_ptr1 += output_w_remain;
            output_ptr2 += output_w_remain;
          }
          // pad right
          if (padding_r > 0) {
            float32x2_t row0 = vld1_f32(input_ptr0);
            float32x2_t row1 = vld1_f32(input_ptr1);
            float32x2_t row2 = vld1_f32(input_ptr2);
            float32x2_t row3 = vld1_f32(input_ptr3);
            float32x2_t row4 = vld1_f32(input_ptr4);
            float32x2_t row5 = vld1_f32(input_ptr5);
            float32x2_t row6 = vld1_f32(input_ptr6);
            float32x2_t pad0 = vPoolInit_f32<P>();
            float32x2_t acc0, acc1, acc2, post;
            for (int w = valid_w_end; w < output_w; ++w) {
              int padding = 2 * w + 3 - (padding_w + input_w);
              if (padding >= 3) {
                *output_ptr0 = 0.f;
                *output_ptr1 = 0.f;
                *output_ptr2 = 0.f;
              } else {
                post = vdup_n_f32(1.f / (3 * (3 - padding)));
                acc0 = vPoolPre_f32<P>(row0, row1);
                acc1 = vPoolPre_f32<P>(row2, row3);
                acc2 = vPoolPre_f32<P>(row4, row5);
                acc0 = vPoolPre_f32<P>(acc0, row2);
                acc1 = vPoolPre_f32<P>(acc1, row4);
                acc2 = vPoolPre_f32<P>(acc2, row6);
                if (padding == 1) {
                  acc0 = vpPoolPre_f32<P>(acc0, acc0);
                  acc1 = vpPoolPre_f32<P>(acc1, acc1);
                  acc2 = vpPoolPre_f32<P>(acc2, acc2);
                }
                acc0 = vPoolPost_f32<P>(acc0, post);
                acc1 = vPoolPost_f32<P>(acc1, post);
                acc2 = vPoolPost_f32<P>(acc2, post);
                vst1_lane_f32(output_ptr0, acc0, 0);
                vst1_lane_f32(output_ptr1, acc1, 0);
                vst1_lane_f32(output_ptr2, acc2, 0);
              }
              output_ptr0++;
              output_ptr1++;
              output_ptr2++;
            }
          }
        }
        // remain height
        int start_h = valid_h_start + valid_h / 3 * 3;
        for (int h = start_h; h < valid_h_end; ++h) {
          const float *input_ptr0 = input_ptr + (2 * h - padding_h) * input_w;
          const float *input_ptr1 = input_ptr0 + input_w;
          const float *input_ptr2 = input_ptr1 + input_w;
          float *output_ptr0 = output_ptr + h * output_w;
          // pad left
          if (padding_w) {
            float32x2_t row0 = vld1_f32(input_ptr0);
            float32x2_t row1 = vld1_f32(input_ptr1);
            float32x2_t row2 = vld1_f32(input_ptr2);
            float32x2_t pad0 = vPoolInit_f32<P>();
            float32x2_t acc0, post;
            for (int w = valid_w_start - 1; w >= 0; --w) {
              int padding = padding_w - (w << 1);
              if (padding >= 3) {
                output_ptr0[w] = 0.f;
              } else {
                post = vdup_n_f32(1.f / (3 * (3 - padding)));
                acc0 = vPoolPre_f32<P>(row0, row1);
                acc0 = vPoolPre_f32<P>(acc0, row2);
                if (padding == 1) {
                  acc0 = vpPoolPre_f32<P>(acc0, acc0);
                }
                acc0 = vPoolPost_f32<P>(acc0, post);
                vst1_lane_f32(output_ptr0 + w, acc0, 0);
              }
            }
            input_ptr0 += valid_input_w_start;
            input_ptr1 += valid_input_w_start;
            input_ptr2 += valid_input_w_start;
            output_ptr0 += valid_w_start;
          }
          // valid
          float32x4x2_t x0, x1, x2, y0;
          float32x4_t post = vdupq_n_f32(1.f / 9);
          for (int loop = 0; loop < output_w_tiles; ++loop) {
            x0 = vld2q_f32(input_ptr0);
            x1 = vld2q_f32(input_ptr0 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);

            x0 = vld2q_f32(input_ptr1);
            x1 = vld2q_f32(input_ptr1 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], y0.val[1]);

            x0 = vld2q_f32(input_ptr2);
            x1 = vld2q_f32(input_ptr2 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], y0.val[1]);
            y0.val[0] = vPoolPostq_f32<P>(y0.val[0], post);
            y0.val[1] = vPoolPostq_f32<P>(y0.val[1], post);
            vst1q_f32(output_ptr0, y0.val[0]);
            vst1_f32(output_ptr0 + 4, vget_low_f32(y0.val[1]));

            input_ptr0 += 12;
            input_ptr1 += 12;
            input_ptr2 += 12;
            output_ptr0 += 6;
          }
          // remain width
          if (output_w_remain > 0) {
            x0 = vld2q_f32(input_ptr0);
            x1 = vld2q_f32(input_ptr0 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);

            x0 = vld2q_f32(input_ptr1);
            x1 = vld2q_f32(input_ptr1 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], y0.val[1]);

            x0 = vld2q_f32(input_ptr2);
            x1 = vld2q_f32(input_ptr2 + 8);
            x2.val[0] = vextq_f32(x0.val[0], x1.val[0], 1);
            x2.val[1] = vextq_f32(x1.val[0], x1.val[0], 1);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x0.val[1]);
            x0.val[1] = vPoolPreq_f32<P>(x1.val[0], x1.val[1]);
            x0.val[0] = vPoolPreq_f32<P>(x0.val[0], x2.val[0]);
            x0.val[1] = vPoolPreq_f32<P>(x0.val[1], x2.val[1]);
            y0.val[0] = vPoolPreq_f32<P>(x0.val[0], y0.val[0]);
            y0.val[1] = vPoolPreq_f32<P>(x0.val[1], y0.val[1]);
            y0.val[0] = vPoolPostq_f32<P>(y0.val[0], post);
            y0.val[1] = vPoolPostq_f32<P>(y0.val[1], post);
            // restore
            switch (output_w_remain) {
              case 1:
                vst1q_lane_f32(output_ptr0, y0.val[0], 0);
                break;
              case 2:
                vst1_f32(output_ptr0, vget_low_f32(y0.val[0]));
                break;
              case 3:
                vst1_f32(output_ptr0, vget_low_f32(y0.val[0]));
                vst1q_lane_f32(output_ptr0 + 2, y0.val[0], 2);
                break;
              case 4:
                vst1q_f32(output_ptr0, y0.val[0]);
                break;
              case 5:
                vst1q_f32(output_ptr0, y0.val[0]);
                vst1q_lane_f32(output_ptr0 + 4, y0.val[1], 0);
                break;
            }
            input_ptr0 += (output_w_remain << 1);
            input_ptr1 += (output_w_remain << 1);
            input_ptr2 += (output_w_remain << 1);
            output_ptr0 += output_w_remain;
          }
          // pad right
          if (padding_r > 0) {
            float32x2_t row0 = vld1_f32(input_ptr0);
            float32x2_t row1 = vld1_f32(input_ptr1);
            float32x2_t row2 = vld1_f32(input_ptr2);
            float32x2_t pad0 = vPoolInit_f32<P>();
            float32x2_t acc0, post;
            for (int w = valid_w_end; w < output_w; ++w) {
              int padding = 2 * w + 3 - (padding_w + input_w);
              if (padding >= 3) {
                *output_ptr0 = 0.f;
              } else {
                post = vdup_n_f32(1.f / (3 * (3 - padding)));
                acc0 = vPoolPre_f32<P>(row0, row1);
                acc0 = vPoolPre_f32<P>(acc0, row2);
                if (padding == 1) {
                  acc0 = vpPoolPre_f32<P>(acc0, acc0);
                }
                acc0 = vPoolPost_f32<P>(acc0, post);
                vst1_lane_f32(output_ptr0, acc0, 0);
              }
              output_ptr0++;
            }
          }
        }
        // bottom
        for (int h = valid_h_end; h < output_h; ++h) {
          Pooling3x3NormalRow<P, 2>(input_ptr, h, input_h, input_w, padding_h,
                                    padding_w, output_w, output_ptr);
        }
      }
    }
  }
};

template struct Pooling3x3<MAX, 1>;
template struct Pooling3x3<AVG, 1>;
template struct Pooling3x3<MAX, 2>;
template struct Pooling3x3<AVG, 2>;

}  // namespace math
}  // namespace operators
}  // namespace paddle_mobile

#endif  // __ARM_NEON
#endif  // POOL_OP