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test
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// 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 CHANNEL_TILE % 8 == 0
$assert CHANNEL_TILE >= 8
$assert ROW_TILE >= 3
$assert ROW_SUBTILE >= 3
$assert ROW_SUBTILE <= ROW_TILE
$ABC = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
#include <assert.h>

#include <arm_neon.h>

#include <xnnpack/gavgpool.h>
#include <xnnpack/math.h>


void xnn_f16_gavgpool_minmax_ukernel_${ROW_TILE}p${ROW_SUBTILE}x__neonfp16arith_c${CHANNEL_TILE}(
    size_t rows,
    size_t channels,
    const void* input,
    size_t input_stride,
    const void* zero,
    void* buffer,
    void* output,
    const union xnn_f16_scaleminmax_params params[restrict XNN_MIN_ELEMENTS(1)]) XNN_OOB_READS
{
  assert(rows > ${ROW_TILE});
  assert(channels != 0);

  const uint16_t* i0 = input;
  $for M in range(1, ROW_TILE):
    const uint16_t* i${M} = (const uint16_t*) ((uintptr_t) i${M-1} + input_stride);
  const size_t input_increment = ${ROW_TILE} * input_stride - round_up_po2(channels, 8) * sizeof(uint16_t);

  uint16_t* b = buffer;
  size_t c = channels;
  for (; ${"c >= %d" % CHANNEL_TILE if CHANNEL_TILE > 8 else "c != 0"}; ${("c -= %d" if CHANNEL_TILE > 8 else "c = doz(c, %d)") % CHANNEL_TILE}) {
    $for M in range(2):
      $for C in range(0, CHANNEL_TILE, 8):
        const float16x8_t vi${M}x${ABC[C:C+8]} = vreinterpretq_f16_u16(vld1q_u16(i${M})); i${M} += 8;

    $for C in range(0, CHANNEL_TILE, 8):
      const float16x8_t vi2x${ABC[C:C+8]} = vreinterpretq_f16_u16(vld1q_u16(i2)); i2 += 8;
      float16x8_t vacc${ABC[C:C+8]} = vaddq_f16(vi0x${ABC[C:C+8]}, vi1x${ABC[C:C+8]});

    $for M in range(2, ROW_TILE):
      $for C in range(0, CHANNEL_TILE, 8):
        $if M + 1 != ROW_TILE:
          const float16x8_t vi${M+1}x${ABC[C:C+8]} = vreinterpretq_f16_u16(vld1q_u16(i${M+1})); i${M+1} += 8;
        vacc${ABC[C:C+8]} = vaddq_f16(vacc${ABC[C:C+8]}, vi${M}x${ABC[C:C+8]});

    $for C in range(0, CHANNEL_TILE, 8):
      vst1q_u16(b, vreinterpretq_u16_f16(vacc${ABC[C:C+8]})); b += 8;
  }
  $if CHANNEL_TILE > 8:
    if XNN_UNLIKELY(c != 0) {
      do {
        $for M in range(3):
          const float16x8_t vi${M}x${ABC[0:8]} = vreinterpretq_f16_u16(vld1q_u16(i${M})); i${M} += 8;
        float16x8_t vacc${ABC[0:8]} = vaddq_f16(vi0x${ABC[0:8]}, vi1x${ABC[0:8]});

        $for M in range(2, ROW_TILE):
          $if M + 1 != ROW_TILE:
            const float16x8_t vi${M+1}x${ABC[0:8]} = vreinterpretq_f16_u16(vld1q_u16(i${M+1})); i${M+1} += 8;
          vacc${ABC[0:8]} = vaddq_f16(vacc${ABC[0:8]}, vi${M}x${ABC[0:8]});

        vst1q_u16(b, vreinterpretq_u16_f16(vacc${ABC[0:8]})); b += 8;

        c = doz(c, 8);
      } while (c != 0);
    }

  for (rows -= ${ROW_TILE}; rows > ${ROW_SUBTILE}; rows -= ${ROW_SUBTILE}) {
    $for M in range(ROW_SUBTILE):
      i${M} = (const uint16_t*) ((uintptr_t) i${M + ROW_TILE - ROW_SUBTILE} + input_increment);

    uint16_t* b = buffer;
    size_t c = channels;
    for (; ${"c >= %d" % CHANNEL_TILE if CHANNEL_TILE > 8 else "c != 0"}; ${("c -= %d" if CHANNEL_TILE > 8 else "c = doz(c, %d)") % CHANNEL_TILE}) {
      float16x8_t vacc${ABC[0:8]} = vreinterpretq_f16_u16(vld1q_u16(b));
      $for C in range(8, CHANNEL_TILE, 8):
        float16x8_t vacc${ABC[C:C+8]} = vreinterpretq_f16_u16(vld1q_u16(b + ${C}));

      $for C in range(0, CHANNEL_TILE, 8):
        const float16x8_t vi0x${ABC[C:C+8]} = vreinterpretq_f16_u16(vld1q_u16(i0)); i0 += 8;

      $for M in range(ROW_TILE):
        $for C in range(0, CHANNEL_TILE, 8):
          $if M + 1 != ROW_TILE:
            const float16x8_t vi${M+1}x${ABC[C:C+8]} = vreinterpretq_f16_u16(vld1q_u16(i${M+1})); i${M+1} += 8;
          vacc${ABC[C:C+8]} = vaddq_f16(vacc${ABC[C:C+8]}, vi${M}x${ABC[C:C+8]});

      $for C in range(0, CHANNEL_TILE, 8):
        vst1q_u16(b, vreinterpretq_u16_f16(vacc${ABC[C:C+8]})); b += 8;
    }
    $if CHANNEL_TILE > 8:
      if XNN_UNLIKELY(c != 0) {
        do {
          float16x8_t vacc${ABC[0:8]} = vreinterpretq_f16_u16(vld1q_u16(b));
          const float16x8_t vi0x${ABC[0:8]} = vreinterpretq_f16_u16(vld1q_u16(i0)); i0 += 8;

          $for M in range(ROW_TILE):
            $if M + 1 != ROW_TILE:
              const float16x8_t vi${M+1}x${ABC[0:8]} = vreinterpretq_f16_u16(vld1q_u16(i${M+1})); i${M+1} += 8;
            vacc${ABC[0:8]} = vaddq_f16(vacc${ABC[0:8]}, vi${M}x${ABC[0:8]});

          vst1q_u16(b, vreinterpretq_u16_f16(vacc${ABC[0:8]})); b += 8;

          c = doz(c, 8);
        } while (c != 0);
      }
  }

  i0 = (const uint16_t*) ((uintptr_t) i${ROW_TILE - ROW_SUBTILE} + input_increment);
  $for M in range(1, ROW_SUBTILE):
    i${M} = (const uint16_t*) ((uintptr_t) i${M + ROW_TILE - ROW_SUBTILE} + input_increment);
    $if M % 2 == 1:
      if XNN_UNPREDICTABLE(rows < ${M+1}) {
        i${M} = (const uint16_t*) zero;
      }
    $else:
      if XNN_UNPREDICTABLE(rows <= ${M}) {
        i${M} = (const uint16_t*) zero;
      }

  const float16x8_t vscale = vreinterpretq_f16_u16(vld1q_dup_u16(&params->fp16arith.scale));
  const float16x8_t vmin = vreinterpretq_f16_u16(vld1q_dup_u16(&params->fp16arith.min));
  const float16x8_t vmax = vreinterpretq_f16_u16(vld1q_dup_u16(&params->fp16arith.max));
  for (; channels >= ${CHANNEL_TILE}; channels -= ${CHANNEL_TILE}) {
    $for C in range(0, CHANNEL_TILE, 8):
      float16x8_t vacc${ABC[C:C+8]} = vreinterpretq_f16_u16(vld1q_u16(buffer)); buffer = (uint16_t*) buffer + 8;

    $for C in range(0, CHANNEL_TILE, 8):
      const float16x8_t vi0x${ABC[C:C+8]} = vreinterpretq_f16_u16(vld1q_u16(i0)); i0 += 8;

    $for M in range(ROW_TILE):
      $for C in range(0, CHANNEL_TILE, 8):
        $if M + 1 != ROW_TILE:
          const float16x8_t vi${M+1}x${ABC[C:C+8]} = vreinterpretq_f16_u16(vld1q_u16(i${M+1})); i${M+1} += 8;
        vacc${ABC[C:C+8]} = vaddq_f16(vacc${ABC[C:C+8]}, vi${M}x${ABC[C:C+8]});

    $for C in range(0, CHANNEL_TILE, 8):
      vacc${ABC[C:C+8]} = vmulq_f16(vacc${ABC[C:C+8]}, vscale);

    $for C in range(0, CHANNEL_TILE, 8):
      vacc${ABC[C:C+8]} = vmaxq_f16(vacc${ABC[C:C+8]}, vmin);

    $for C in range(0, CHANNEL_TILE, 8):
      vacc${ABC[C:C+8]} = vminq_f16(vacc${ABC[C:C+8]}, vmax);

    $for C in range(0, CHANNEL_TILE, 8):
      vst1q_u16(output, vreinterpretq_u16_f16(vacc${ABC[C:C+8]})); output = (uint16_t*) output + 8;
  }
  if XNN_UNLIKELY(channels != 0) {
    ${"do " if CHANNEL_TILE > 8 else ""}{
      float16x8_t vacc${ABC[0:8]} = vreinterpretq_f16_u16(vld1q_u16(buffer)); buffer = (uint16_t*) buffer + 8;

      const float16x8_t vi0x${ABC[0:8]} = vreinterpretq_f16_u16(vld1q_u16(i0)); i0 += 8;
      $for M in range(ROW_TILE):
        $if M + 1 != ROW_TILE:
          const float16x8_t vi${M+1}x${ABC[0:8]} = vreinterpretq_f16_u16(vld1q_u16(i${M+1})); i${M+1} += 8;
        vacc${ABC[0:8]} = vaddq_f16(vacc${ABC[0:8]}, vi${M}x${ABC[0:8]});

      vacc${ABC[0:8]} = vmulq_f16(vacc${ABC[0:8]}, vscale);
      vacc${ABC[0:8]} = vmaxq_f16(vacc${ABC[0:8]}, vmin);
      vacc${ABC[0:8]} = vminq_f16(vacc${ABC[0:8]}, vmax);

      $if CHANNEL_TILE > 8:
        if XNN_LIKELY(channels >= 8) {
          vst1q_u16(output, vreinterpretq_u16_f16(vacc${ABC[0:8]})); output = (uint16_t*) output + 8;
          channels -= 8;
        } else {
          float16x4_t vacc${ABC[0:4]} = vget_low_f16(vacc${ABC[0:8]});
          if (channels & 4) {
            vst1_u16(output, vreinterpret_u16_f16(vacc${ABC[0:4]})); output = (uint16_t*) output + 4;
            vacc${ABC[0:4]} = vget_high_f16(vacc${ABC[0:8]});
          }
          if (channels & 2) {
            vst1_lane_u32(output, vreinterpret_u32_f16(vacc${ABC[0:4]}), 0); output = (uint16_t*) output + 2;
            vacc${ABC[0:4]} = vext_f16(vacc${ABC[0:4]}, vacc${ABC[0:4]}, 2);
          }
          if (channels & 1) {
            vst1_lane_u16(output, vreinterpret_u16_f16(vacc${ABC[0:4]}), 0); output = (uint16_t*) output + 1;
          }
          channels = 0;
        }
      $else:
        float16x4_t vacc${ABC[0:4]} = vget_low_f16(vacc${ABC[0:8]});
        if (channels & 4) {
          vst1_u16(output, vreinterpret_u16_f16(vacc${ABC[0:4]})); output = (uint16_t*) output + 4;
          vacc${ABC[0:4]} = vget_high_f16(vacc${ABC[0:8]});
        }
        if (channels & 2) {
          vst1_lane_u32(output, vreinterpret_u32_f16(vacc${ABC[0:4]}), 0); output = (uint16_t*) output + 2;
          vacc${ABC[0:4]} = vext_f16(vacc${ABC[0:4]}, vacc${ABC[0:4]}, 2);
        }
        if (channels & 1) {
          vst1_lane_u16(output, vreinterpret_u16_f16(vacc${ABC[0:4]}), 0); output = (uint16_t*) output + 1;
        }
    }${" while (channels != 0);" if CHANNEL_TILE > 8 else ""}
  }
}