// Copyright 2020 Google LLC
//
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree.

$assert ROW_TILE >= 1
$assert ACCUMULATORS >= 1
#include <assert.h>

#include <arm_neon.h>

#include <xnnpack/dwconv.h>
#include <xnnpack/intrinsics-polyfill.h>
#include <xnnpack/math.h>


void xnn_f16_dwconv2d_chw_ukernel_5x5s2p2__neonfp16arith_${ROW_TILE}x8${"_acc%d" % ACCUMULATORS if ACCUMULATORS > 1 else ""}(
    size_t input_height,
    size_t input_width,
    const void* input,
    const void* weights,
    const void* zero,
    void* output,
    uint32_t padding_top,
    const union xnn_f16_chw_params params[restrict XNN_MIN_ELEMENTS(1)]) XNN_OOB_READS
{
  assert(input_height != 0);
  assert(input_width != 0);
  assert(input_width % sizeof(uint16_t) == 0);
  assert(padding_top >= 1);
  assert(padding_top <= 2);

  #if XNN_ARCH_ARM64
    const uint16x8x2_t vminmax = vld2q_dup_u16(&params->neonfp16arith_stride2.min);
    const float16x8_t vmin = vreinterpretq_f16_u16(vminmax.val[0]);
    const float16x8_t vmax = vreinterpretq_f16_u16(vminmax.val[1]);
  #else
    // vld2_dup is to work around aarch32 clang bug with vld1q_dup
    const uint16x4x2_t vminmax = vld2_dup_u16(&params->neonfp16arith_stride2.min);
    const float16x8_t vmin = vreinterpretq_f16_u16(vcombine_u16(vminmax.val[0], vminmax.val[0]));
    const float16x8_t vmax = vreinterpretq_f16_u16(vcombine_u16(vminmax.val[1], vminmax.val[1]));
  #endif
  const uint16x8_t vmask_even = vld1q_u16(params->neonfp16arith_stride2.mask_even);
  const uint16x8_t vmask_odd = vld1q_u16(params->neonfp16arith_stride2.mask_odd);

  const uint16_t* w = (const uint16_t*) weights;
  const float16x8_t vw01234567 = vreinterpretq_f16_u16(vld1q_u16(w));
  const float16x8_t vw89ABCDEF = vreinterpretq_f16_u16(vld1q_u16(w + 8));
  const float16x8_t vwGHIJKLMN = vreinterpretq_f16_u16(vld1q_u16(w + 16));
  const float16x4_t vwOP = vreinterpret_f16_u32(vld1_dup_u32((const void*) (w + 24)));

  const uint32_t padding_top_less_1 = padding_top - 1;
  const size_t input_decrement = round_up_po2(input_width, 16 * sizeof(uint16_t));

  const uint16_t* i0 = zero;
  const uint16_t* i1 = (const uint16_t*) ((uintptr_t) input - ((-padding_top_less_1) & input_width));
  const uint16_t* i2 = (const uint16_t*) ((uintptr_t) i1 + input_width);
  if XNN_UNPREDICTABLE(padding_top_less_1 != 0) {
    i1 = zero;
  }
  $for M in range(3, 3 + 2 * ROW_TILE):
    const uint16_t* i${M} = (const uint16_t*) ((uintptr_t) i${M-1} + input_width);

  $if ROW_TILE > 1:
    const size_t output_width = round_down_po2((input_width + (2 /* padding */ - 3 /* kernel size */ + 2 /* subsampling */) * sizeof(uint16_t)) / 2, sizeof(uint16_t));

  uint16_t* o0 = output;
  $for M in range(1, ROW_TILE):
    uint16_t* o${M} = (uint16_t*) ((uintptr_t) o${M-1} + output_width);

  size_t padded_input_height = input_height + (padding_top_less_1 + 1) + 2 /* padding bottom */;
  size_t output_height = (padded_input_height - 5 /* kernel size */ + 2 /* subsampling */) / 2;
  do {
    $for M in range(3, 3 + 2 * ROW_TILE):
      if XNN_UNPREDICTABLE(padded_input_height < ${3 + M}) {
        i${M} = zero;
        $if M % 2 == 0 and M <= 2 * ROW_TILE + 1:
          o${M // 2 - 1} = o${M // 2 - 2};
      }

    $for M in range(3 + 2 * ROW_TILE):
      float16x8_t vi${M}x02468ACE = vreinterpretq_f16_u16(vmovq_n_u16(0));

    $for M in range(3 + 2 * ROW_TILE):
      float16x8_t vi${M}x13579BDF = vreinterpretq_f16_u16(vmovq_n_u16(0));

    $for M in range(3 + 2 * ROW_TILE):
      uint16x8x2_t vi${M}xGIKMOQSUHJLNPRTV = vld2q_u16(i${M}); i${M} += 16;

    size_t w = input_width;
    for (; w > 16 * sizeof(uint16_t); w -= 16 * sizeof(uint16_t)) {
      $for M in range(ROW_TILE):
        float16x8_t vo${M}p0 = vdupq_lane_f16(vget_low_f16(vw01234567), 0);

      // Center column
      $for M in range(ROW_TILE):
        $if ACCUMULATORS > 1:
          float16x8_t vo${M}p1 = vmulq_lane_f16(vreinterpretq_f16_u16(vi${2*M}xGIKMOQSUHJLNPRTV.val[0]), vget_low_f16(vw01234567), 3);
        $else:
          #if XNN_ARCH_ARM64
            vo${M}p0 = vfmaq_laneq_f16(vo${M}p0, vreinterpretq_f16_u16(vi${2*M}xGIKMOQSUHJLNPRTV.val[0]), vw01234567, 3);
          #else
            vo${M}p0 = vmlaq_lane_f16(vo${M}p0, vreinterpretq_f16_u16(vi${2*M}xGIKMOQSUHJLNPRTV.val[0]), vget_low_f16(vw01234567), 3);
          #endif
      $for M in range(ROW_TILE):
        $if ACCUMULATORS > 2:
          float16x8_t vo${M}p2 = vmulq_lane_f16(vreinterpretq_f16_u16(vi${2*M+1}xGIKMOQSUHJLNPRTV.val[0]), vget_low_f16(vw89ABCDEF), 0);
        $else:
          #if XNN_ARCH_ARM64
            vo${M}p0 = vfmaq_laneq_f16(vo${M}p0, vreinterpretq_f16_u16(vi${2*M+1}xGIKMOQSUHJLNPRTV.val[0]), vw89ABCDEF, 0);
          #else
            vo${M}p0 = vmlaq_lane_f16(vo${M}p0, vreinterpretq_f16_u16(vi${2*M+1}xGIKMOQSUHJLNPRTV.val[0]), vget_low_f16(vw89ABCDEF), 0);
          #endif
      $for M in range(ROW_TILE):
        $if ACCUMULATORS > 3:
          float16x8_t vo${M}p3 = vmulq_lane_f16(vreinterpretq_f16_u16(vi${2*M+2}xGIKMOQSUHJLNPRTV.val[0]), vget_high_f16(vw89ABCDEF), 1);
        $else:
          #if XNN_ARCH_ARM64
            vo${M}p${4 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${4 % ACCUMULATORS}, vreinterpretq_f16_u16(vi${2*M+2}xGIKMOQSUHJLNPRTV.val[0]), vw89ABCDEF, 5);
          #else
            vo${M}p${4 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${4 % ACCUMULATORS}, vreinterpretq_f16_u16(vi${2*M+2}xGIKMOQSUHJLNPRTV.val[0]), vget_high_f16(vw89ABCDEF), 1);
          #endif
      $for M in range(ROW_TILE):
        $if ACCUMULATORS > 4:
          float16x8_t vo${M}p4 = vmulq_lane_f16(vreinterpretq_f16_u16(vi${2*M+3}xGIKMOQSUHJLNPRTV.val[0]), vget_low_f16(vwGHIJKLMN), 2);
        $else:
          #if XNN_ARCH_ARM64
            vo${M}p${5 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${5 % ACCUMULATORS}, vreinterpretq_f16_u16(vi${2*M+3}xGIKMOQSUHJLNPRTV.val[0]), vwGHIJKLMN, 2);
          #else
            vo${M}p${5 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${5 % ACCUMULATORS}, vreinterpretq_f16_u16(vi${2*M+3}xGIKMOQSUHJLNPRTV.val[0]), vget_low_f16(vwGHIJKLMN), 2);
          #endif
      $for M in range(ROW_TILE):
        $if ACCUMULATORS > 5:
          vo${M}p5 = vmulq_lane_f16(vreinterpretq_f16_u16(vi${2*M+4}xGIKMOQSUHJLNPRTV.val[0]), vget_high_f16(vwGHIJKLMN), 3);
        $else:
          #if XNN_ARCH_ARM64
            vo${M}p${6 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${6 % ACCUMULATORS}, vreinterpretq_f16_u16(vi${2*M+4}xGIKMOQSUHJLNPRTV.val[0]), vwGHIJKLMN, 7);
          #else
            vo${M}p${6 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${6 % ACCUMULATORS}, vreinterpretq_f16_u16(vi${2*M+4}xGIKMOQSUHJLNPRTV.val[0]), vget_high_f16(vwGHIJKLMN), 3);
          #endif
      // Right by 2 column
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${7 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${7 % ACCUMULATORS}, vreinterpretq_f16_u16(vi${2*M}xGIKMOQSUHJLNPRTV.val[1]), vw01234567, 4);
        #else
          vo${M}p${7 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${7 % ACCUMULATORS}, vreinterpretq_f16_u16(vi${2*M}xGIKMOQSUHJLNPRTV.val[1]), vget_high_f16(vw01234567), 0);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${8 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${8 % ACCUMULATORS}, vreinterpretq_f16_u16(vi${2*M+1}xGIKMOQSUHJLNPRTV.val[1]), vw89ABCDEF, 1);
        #else
          vo${M}p${8 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${8 % ACCUMULATORS}, vreinterpretq_f16_u16(vi${2*M+1}xGIKMOQSUHJLNPRTV.val[1]), vget_low_f16(vw89ABCDEF), 1);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${9 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${9 % ACCUMULATORS}, vreinterpretq_f16_u16(vi${2*M+2}xGIKMOQSUHJLNPRTV.val[1]), vw89ABCDEF, 6);
        #else
          vo${M}p${9 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${9 % ACCUMULATORS}, vreinterpretq_f16_u16(vi${2*M+2}xGIKMOQSUHJLNPRTV.val[1]), vget_high_f16(vw89ABCDEF), 2);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${10 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${10 % ACCUMULATORS}, vreinterpretq_f16_u16(vi${2*M+3}xGIKMOQSUHJLNPRTV.val[1]), vwGHIJKLMN, 3);
        #else
          vo${M}p${10 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${10 % ACCUMULATORS}, vreinterpretq_f16_u16(vi${2*M+3}xGIKMOQSUHJLNPRTV.val[1]), vget_low_f16(vwGHIJKLMN), 3);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${11 % ACCUMULATORS} = vfmaq_lane_f16(vo${M}p${11 % ACCUMULATORS}, vreinterpretq_f16_u16(vi${2*M+4}xGIKMOQSUHJLNPRTV.val[1]), vwOP, 0);
        #else
          vo${M}p${11 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${11 % ACCUMULATORS}, vreinterpretq_f16_u16(vi${2*M+4}xGIKMOQSUHJLNPRTV.val[1]), vwOP, 0);
        #endif
      // Left by 2 column
      $for M in range(3 + 2 * ROW_TILE):
        const float16x8_t vi${M}xEGIKMOQS = vextq_f16(vi${M}x02468ACE, vreinterpretq_f16_u16(vi${M}xGIKMOQSUHJLNPRTV.val[0]), 7);
        vi${M}x02468ACE = vreinterpretq_f16_u16(vi${M}xGIKMOQSUHJLNPRTV.val[0]);

      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${12 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${12 % ACCUMULATORS}, vi${2*M}xEGIKMOQS, vw01234567, 1);
        #else
          vo${M}p${12 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${12 % ACCUMULATORS}, vi${2*M}xEGIKMOQS, vget_low_f16(vw01234567), 1);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${13 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${13 % ACCUMULATORS}, vi${2*M+1}xEGIKMOQS, vw01234567, 6);
        #else
          vo${M}p${13 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${13 % ACCUMULATORS}, vi${2*M+1}xEGIKMOQS, vget_high_f16(vw01234567), 2);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${14 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${14 % ACCUMULATORS}, vi${2*M+2}xEGIKMOQS, vw89ABCDEF, 3);
        #else
          vo${M}p${14 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${14 % ACCUMULATORS}, vi${2*M+2}xEGIKMOQS, vget_low_f16(vw89ABCDEF), 3);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${15 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${15 % ACCUMULATORS}, vi${2*M+3}xEGIKMOQS, vwGHIJKLMN, 0);
        #else
          vo${M}p${15 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${15 % ACCUMULATORS}, vi${2*M+3}xEGIKMOQS, vget_low_f16(vwGHIJKLMN), 0);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${16 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${16 % ACCUMULATORS}, vi${2*M+4}xEGIKMOQS, vwGHIJKLMN, 5);
        #else
          vo${M}p${16 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${16 % ACCUMULATORS}, vi${2*M+4}xEGIKMOQS, vget_high_f16(vwGHIJKLMN), 1);
        #endif
      // Left by 1 column, s1
      $for M in range(3 + 2 * ROW_TILE):
        const float16x8_t vi${M}xFHJLNPRT = vextq_f16(vi${M}x13579BDF, vreinterpretq_f16_u16(vi${M}xGIKMOQSUHJLNPRTV.val[1]), 7);
        vi${M}x13579BDF = vreinterpretq_f16_u16(vi${M}xGIKMOQSUHJLNPRTV.val[1]);

      $for M in range(3 + 2 * ROW_TILE):
        const uint16x8x2_t vi${M}xWYacegikXZbdfhjl = vld2q_u16(i${M}); i${M} += 16;

      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${17 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${17 % ACCUMULATORS}, vi${2*M}xFHJLNPRT, vw01234567, 2);
        #else
          vo${M}p${17 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${17 % ACCUMULATORS}, vi${2*M}xFHJLNPRT, vget_low_f16(vw01234567), 2);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${18 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${18 % ACCUMULATORS}, vi${2*M+1}xFHJLNPRT, vw01234567, 7);
        #else
          vo${M}p${18 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${18 % ACCUMULATORS}, vi${2*M+1}xFHJLNPRT, vget_high_f16(vw01234567), 3);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${19 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${19 % ACCUMULATORS}, vi${2*M+2}xFHJLNPRT, vw89ABCDEF, 4);
        #else
          vo${M}p${19 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${19 % ACCUMULATORS}, vi${2*M+2}xFHJLNPRT, vget_high_f16(vw89ABCDEF), 0);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${20 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${20 % ACCUMULATORS}, vi${2*M+3}xFHJLNPRT, vwGHIJKLMN, 1);
        #else
          vo${M}p${20 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${20 % ACCUMULATORS}, vi${2*M+3}xFHJLNPRT, vget_low_f16(vwGHIJKLMN), 1);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${21 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${21 % ACCUMULATORS}, vi${2*M+4}xFHJLNPRT, vwGHIJKLMN, 6);
        #else
          vo${M}p${21 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${21 % ACCUMULATORS}, vi${2*M+4}xFHJLNPRT, vget_high_f16(vwGHIJKLMN), 2);
        #endif
      // Right by 1 column
      $for M in range(3 + 2 * ROW_TILE):
        const float16x8_t vi${M}xIKMOQSUW = vextq_f16(vreinterpretq_f16_u16(vi${M}xGIKMOQSUHJLNPRTV.val[0]), vreinterpretq_f16_u16(vi${M}xWYacegikXZbdfhjl.val[0]), 1);
        vi${M}xGIKMOQSUHJLNPRTV = vi${M}xWYacegikXZbdfhjl;

      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${22 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${22 % ACCUMULATORS}, vi${2*M}xIKMOQSUW, vw01234567, 5);
        #else
          vo${M}p${22 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${22 % ACCUMULATORS}, vi${2*M}xIKMOQSUW, vget_high_f16(vw01234567), 1);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${23 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${23 % ACCUMULATORS}, vi${2*M+1}xIKMOQSUW, vw89ABCDEF, 2);
        #else
          vo${M}p${23 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${23 % ACCUMULATORS}, vi${2*M+1}xIKMOQSUW, vget_low_f16(vw89ABCDEF), 2);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${24 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${24 % ACCUMULATORS}, vi${2*M+2}xIKMOQSUW, vw89ABCDEF, 7);
        #else
          vo${M}p${24 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${24 % ACCUMULATORS}, vi${2*M+2}xIKMOQSUW, vget_high_f16(vw89ABCDEF), 3);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${25 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${25 % ACCUMULATORS}, vi${2*M+3}xIKMOQSUW, vwGHIJKLMN, 4);
        #else
          vo${M}p${25 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${25 % ACCUMULATORS}, vi${2*M+3}xIKMOQSUW, vget_high_f16(vwGHIJKLMN), 0);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${26 % ACCUMULATORS} = vfmaq_lane_f16(vo${M}p${26 % ACCUMULATORS}, vi${2*M+4}xIKMOQSUW, vwOP, 1);
        #else
          vo${M}p${26 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${26 % ACCUMULATORS}, vi${2*M+4}xIKMOQSUW, vwOP, 1);
        #endif
      $if ACCUMULATORS > 1:
        $ACC_SLICE = 1
        $while ACC_SLICE < ACCUMULATORS:
          $for A in range(0, ACCUMULATORS, ACC_SLICE * 2):
            $if A + ACC_SLICE < ACCUMULATORS:
              $for M in range(ROW_TILE):
                vo${M}p${A} = vaddq_f16(vo${M}p${A}, vo${M}p${A + ACC_SLICE});
          $ACC_SLICE *= 2

      $for M in range(ROW_TILE):
        float16x8_t vo${M} = vmaxq_f16(vo${M}p0, vmin);

      $for M in range(ROW_TILE):
        vo${M} = vminq_f16(vo${M}, vmax);

      $for M in reversed(range(ROW_TILE)):
        vst1q_u16(o${M}, vreinterpretq_u16_f16(vo${M})); o${M} += 8;
    }

    // Last block has 1-16 pixels to process.
    assert(w <= 16 * sizeof(uint16_t));
    assert(w >= 1 * sizeof(uint16_t));
    {
      $for M in range(ROW_TILE):
        float16x8_t vo${M}p0 = vdupq_lane_f16(vget_low_f16(vw01234567), 0);

      $for M in range(3 + 2 * ROW_TILE):
        const float16x8_t vi${M}xGIKMOQSU = vreinterpretq_f16_u16(vandq_u16(vmask_even, vi${M}xGIKMOQSUHJLNPRTV.val[0]));

      $for M in range(3 + 2 * ROW_TILE):
        const float16x8_t vi${M}xHJLNPRTV = vreinterpretq_f16_u16(vandq_u16(vmask_odd, vi${M}xGIKMOQSUHJLNPRTV.val[1]));

      // Center column
      $for M in range(ROW_TILE):
        $if ACCUMULATORS > 1:
          float16x8_t vo${M}p1 = vmulq_lane_f16(vi${2*M}xGIKMOQSU, vget_low_f16(vw01234567), 3);
        $else:
          #if XNN_ARCH_ARM64
            vo${M}p0 = vfmaq_laneq_f16(vo${M}p0, vi${2*M}xGIKMOQSU, vw01234567, 3);
          #else
            vo${M}p0 = vmlaq_lane_f16(vo${M}p0, vi${2*M}xGIKMOQSU, vget_low_f16(vw01234567), 3);
          #endif
      $for M in range(ROW_TILE):
        $if ACCUMULATORS > 2:
          float16x8_t vo${M}p2 = vmulq_lane_f16(vi${2*M+1}xGIKMOQSU, vget_low_f16(vw89ABCDEF), 0);
        $else:
          #if XNN_ARCH_ARM64
            vo${M}p0 = vfmaq_laneq_f16(vo${M}p0, vi${2*M+1}xGIKMOQSU, vw89ABCDEF, 0);
          #else
            vo${M}p0 = vmlaq_lane_f16(vo${M}p0, vi${2*M+1}xGIKMOQSU, vget_low_f16(vw89ABCDEF), 0);
          #endif
      $for M in range(ROW_TILE):
        $if ACCUMULATORS > 3:
          float16x8_t vo${M}p3 = vmulq_lane_f16(vi${2*M+2}xGIKMOQSU, vget_high_f16(vw89ABCDEF), 1);
        $else:
          #if XNN_ARCH_ARM64
            vo${M}p${4 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${4 % ACCUMULATORS}, vi${2*M+2}xGIKMOQSU, vw89ABCDEF, 5);
          #else
            vo${M}p${4 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${4 % ACCUMULATORS}, vi${2*M+2}xGIKMOQSU, vget_high_f16(vw89ABCDEF), 1);
          #endif
      $for M in range(ROW_TILE):
        $if ACCUMULATORS > 4:
          float16x8_t vo${M}p4 = vmulq_lane_f16(vi${2*M+3}xGIKMOQSU, vget_low_f16(vwGHIJKLMN), 2);
        $else:
          #if XNN_ARCH_ARM64
            vo${M}p${5 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${5 % ACCUMULATORS}, vi${2*M+3}xGIKMOQSU, vwGHIJKLMN, 2);
          #else
            vo${M}p${5 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${5 % ACCUMULATORS}, vi${2*M+3}xGIKMOQSU, vget_low_f16(vwGHIJKLMN), 2);
          #endif
      $for M in range(ROW_TILE):
        $if ACCUMULATORS > 5:
          vo${M}p5 = vmulq_lane_f16(vi${2*M+4}xGIKMOQSU, vget_high_f16(vwGHIJKLMN), 3);
        $else:
          #if XNN_ARCH_ARM64
            vo${M}p${6 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${6 % ACCUMULATORS}, vi${2*M+4}xGIKMOQSU, vwGHIJKLMN, 7);
          #else
            vo${M}p${6 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${6 % ACCUMULATORS}, vi${2*M+4}xGIKMOQSU, vget_high_f16(vwGHIJKLMN), 3);
          #endif
      // Right by 1 column
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${7 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${7 % ACCUMULATORS}, vi${2*M}xHJLNPRTV, vw01234567, 4);
        #else
          vo${M}p${7 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${7 % ACCUMULATORS}, vi${2*M}xHJLNPRTV, vget_high_f16(vw01234567), 0);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${8 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${8 % ACCUMULATORS}, vi${2*M+1}xHJLNPRTV, vw89ABCDEF, 1);
        #else
          vo${M}p${8 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${8 % ACCUMULATORS}, vi${2*M+1}xHJLNPRTV, vget_low_f16(vw89ABCDEF), 1);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${9 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${9 % ACCUMULATORS}, vi${2*M+2}xHJLNPRTV, vw89ABCDEF, 6);
        #else
          vo${M}p${9 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${9 % ACCUMULATORS}, vi${2*M+2}xHJLNPRTV, vget_high_f16(vw89ABCDEF), 2);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${10 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${10 % ACCUMULATORS}, vi${2*M+3}xHJLNPRTV, vwGHIJKLMN, 3);
        #else
          vo${M}p${10 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${10 % ACCUMULATORS}, vi${2*M+3}xHJLNPRTV, vget_low_f16(vwGHIJKLMN), 3);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${11 % ACCUMULATORS} = vfmaq_lane_f16(vo${M}p${11 % ACCUMULATORS}, vi${2*M+4}xHJLNPRTV, vwOP, 0);
        #else
          vo${M}p${11 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${11 % ACCUMULATORS}, vi${2*M+4}xHJLNPRTV, vwOP, 0);
        #endif
      // Left by 2 columns
      $for M in range(3 + 2 * ROW_TILE):
        const float16x8_t vi${M}xEGIKMOQS = vextq_f16(vi${M}x02468ACE, vi${M}xGIKMOQSU, 7);

      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${12 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${12 % ACCUMULATORS}, vi${2*M}xEGIKMOQS, vw01234567, 1);
        #else
          vo${M}p${12 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${12 % ACCUMULATORS}, vi${2*M}xEGIKMOQS, vget_low_f16(vw01234567), 1);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${13 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${13 % ACCUMULATORS}, vi${2*M+1}xEGIKMOQS, vw01234567, 6);
        #else
          vo${M}p${13 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${13 % ACCUMULATORS}, vi${2*M+1}xEGIKMOQS, vget_high_f16(vw01234567), 2);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${14 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${14 % ACCUMULATORS}, vi${2*M+2}xEGIKMOQS, vw89ABCDEF, 3);
        #else
          vo${M}p${14 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${14 % ACCUMULATORS}, vi${2*M+2}xEGIKMOQS, vget_low_f16(vw89ABCDEF), 3);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${15 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${15 % ACCUMULATORS}, vi${2*M+3}xEGIKMOQS, vwGHIJKLMN, 0);
        #else
          vo${M}p${15 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${15 % ACCUMULATORS}, vi${2*M+3}xEGIKMOQS, vget_low_f16(vwGHIJKLMN), 0);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${16 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${16 % ACCUMULATORS}, vi${2*M+4}xEGIKMOQS, vwGHIJKLMN, 5);
        #else
          vo${M}p${16 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${16 % ACCUMULATORS}, vi${2*M+4}xEGIKMOQS, vget_high_f16(vwGHIJKLMN), 1);
        #endif
      // Left by 1 column
      $for M in range(3 + 2 * ROW_TILE):
        const float16x8_t vi${M}xFHJLNPRT = vextq_f16(vi${M}x13579BDF, vi${M}xHJLNPRTV, 7);

      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${17 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${17 % ACCUMULATORS}, vi${2*M}xFHJLNPRT, vw01234567, 2);
        #else
          vo${M}p${17 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${17 % ACCUMULATORS}, vi${2*M}xFHJLNPRT, vget_low_f16(vw01234567), 2);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${18 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${18 % ACCUMULATORS}, vi${2*M+1}xFHJLNPRT, vw01234567, 7);
        #else
          vo${M}p${18 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${18 % ACCUMULATORS}, vi${2*M+1}xFHJLNPRT, vget_high_f16(vw01234567), 3);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${19 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${19 % ACCUMULATORS}, vi${2*M+2}xFHJLNPRT, vw89ABCDEF, 4);
        #else
          vo${M}p${19 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${19 % ACCUMULATORS}, vi${2*M+2}xFHJLNPRT, vget_high_f16(vw89ABCDEF), 0);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${20 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${20 % ACCUMULATORS}, vi${2*M+3}xFHJLNPRT, vwGHIJKLMN, 1);
        #else
          vo${M}p${20 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${20 % ACCUMULATORS}, vi${2*M+3}xFHJLNPRT, vget_low_f16(vwGHIJKLMN), 1);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${21 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${21 % ACCUMULATORS}, vi${2*M+4}xFHJLNPRT, vwGHIJKLMN, 6);
        #else
          vo${M}p${21 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${21 % ACCUMULATORS}, vi${2*M+4}xFHJLNPRT, vget_high_f16(vwGHIJKLMN), 2);
        #endif
      // Right by 2 columns
      const float16x8_t vzero = vreinterpretq_f16_u16(vmovq_n_u16(0));
      $for M in range(3 + 2 * ROW_TILE):
        const float16x8_t vi${M}xIKMOQSUW = vextq_f16(vi${M}xGIKMOQSU, vzero, 1);

      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${22 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${22 % ACCUMULATORS}, vi${2*M}xIKMOQSUW, vw01234567, 5);
        #else
          vo${M}p${22 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${22 % ACCUMULATORS}, vi${2*M}xIKMOQSUW, vget_high_f16(vw01234567), 1);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${23 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${23 % ACCUMULATORS}, vi${2*M+1}xIKMOQSUW, vw89ABCDEF, 2);
        #else
          vo${M}p${23 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${23 % ACCUMULATORS}, vi${2*M+1}xIKMOQSUW, vget_low_f16(vw89ABCDEF), 2);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${24 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${24 % ACCUMULATORS}, vi${2*M+2}xIKMOQSUW, vw89ABCDEF, 7);
        #else
          vo${M}p${24 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${24 % ACCUMULATORS}, vi${2*M+2}xIKMOQSUW, vget_high_f16(vw89ABCDEF), 3);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${25 % ACCUMULATORS} = vfmaq_laneq_f16(vo${M}p${25 % ACCUMULATORS}, vi${2*M+3}xIKMOQSUW, vwGHIJKLMN, 4);
        #else
          vo${M}p${25 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${25 % ACCUMULATORS}, vi${2*M+3}xIKMOQSUW, vget_high_f16(vwGHIJKLMN), 0);
        #endif
      $for M in range(ROW_TILE):
        #if XNN_ARCH_ARM64
          vo${M}p${26 % ACCUMULATORS} = vfmaq_lane_f16(vo${M}p${26 % ACCUMULATORS}, vi${2*M+4}xIKMOQSUW, vwOP, 1);
        #else
          vo${M}p${26 % ACCUMULATORS} = vmlaq_lane_f16(vo${M}p${26 % ACCUMULATORS}, vi${2*M+4}xIKMOQSUW, vwOP, 1);
        #endif
      $if ACCUMULATORS > 1:
        $ACC_SLICE = 1
        $while ACC_SLICE < ACCUMULATORS:
          $for A in range(0, ACCUMULATORS, ACC_SLICE * 2):
            $if A + ACC_SLICE < ACCUMULATORS:
              $for M in range(ROW_TILE):
                vo${M}p${A} = vaddq_f16(vo${M}p${A}, vo${M}p${A + ACC_SLICE});
          $ACC_SLICE *= 2

      $for M in range(ROW_TILE):
        float16x8_t vo${M} = vmaxq_f16(vo${M}p0, vmin);

      $for M in range(ROW_TILE):
        vo${M} = vminq_f16(vo${M}, vmax);

      const size_t w_tmp = (w + 1 * sizeof(uint16_t)) / (2 * sizeof(uint16_t));

      if XNN_LIKELY(w_tmp == 8) {
        $for M in reversed(range(ROW_TILE)):
          vst1q_u16(o${M}, vreinterpretq_u16_f16(vo${M})); o${M} += 8;
      } else {
        $for M in reversed(range(ROW_TILE)):
          float16x4_t vo${M}_lo = vget_low_f16(vo${M});

        if (w_tmp & 4) {
         $for M in reversed(range(ROW_TILE)):
            vst1_u16(o${M}, vreinterpret_u16_f16(vo${M}_lo)); o${M} += 4;

          $for M in reversed(range(ROW_TILE)):
            vo${M}_lo = vget_high_f16(vo${M});
        }
        if (w_tmp & 2) {
          $for M in reversed(range(ROW_TILE)):
            vst1_lane_u32((void*) o${M}, vreinterpret_u32_f16(vo${M}_lo), 0); o${M} += 2;

          $for M in range(ROW_TILE):
            vo${M}_lo = vext_f16(vo${M}_lo, vo${M}_lo, 2);
        }
        if (w_tmp & 1) {
          $for M in reversed(range(ROW_TILE)):
            vst1_lane_u16(o${M}, vreinterpret_u16_f16(vo${M}_lo), 0); o${M} += 1;
        }
      }
    }

    i0 = (const uint16_t*) ((uintptr_t) i${2 * ROW_TILE} - input_decrement);
    i1 = (const uint16_t*) ((uintptr_t) i${2 * ROW_TILE + 1} - input_decrement);
    i2 = (const uint16_t*) ((uintptr_t) i${2 * ROW_TILE + 2} - input_decrement);
    $for M in range(3, 3 + 2 * ROW_TILE):
      i${M} = (const uint16_t*) ((uintptr_t) i${M-1} + input_width);

    $if ROW_TILE > 1:
      o0 = o${ROW_TILE - 1};
      $for M in range(1, ROW_TILE):
        o${M} = (uint16_t*) ((uintptr_t) o${M-1} + output_width);

    $if ROW_TILE > 1:
      output_height = doz(output_height, ${ROW_TILE});
      padded_input_height = doz(padded_input_height, ${ROW_TILE * 2});
    $else:
      output_height -= 1;
      padded_input_height -= 2;
  } while (output_height != 0);
}