// 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 <wasm_simd128.h>

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


$ARCH_SUFFIX = "_x86" if X86 else "_arm"

void xnn_f32_dwconv2d_chw_ukernel_3x3p1__wasmsimd${ARCH_SUFFIX}_splat_${ROW_TILE}x4${"_acc%d" % ACCUMULATORS if ACCUMULATORS > 1 else ""}(
    size_t input_height,
    size_t input_width,
    const float* input,
    const float* weights,
    const float* zero,
    float* output,
    uint32_t padding_top,
    const union xnn_f32_minmax_params params[restrict XNN_MIN_ELEMENTS(1)]) XNN_OOB_READS
{
  assert(input_height != 0);
  assert(input_width != 0);
  assert(input_width % sizeof(float) == 0);
  assert(padding_top == 1);

  const v128_t vmax = wasm_v128_load32_splat(&params->scalar.max);
  const v128_t vmin = wasm_v128_load32_splat(&params->scalar.min);
  XNN_FORCE_REALIZATION(vmax);
  XNN_FORCE_REALIZATION(vmin);

  static const int32_t mask_table[7] = {-1, -1, -1, -1, 0, 0, 0};
  const v128_t vmask = wasm_v128_load(&mask_table[3 - (((input_width >> 2) - 1) & 3)]);

  const v128_t vw0123 = wasm_v128_load(weights);
  const v128_t vw4567 = wasm_v128_load(weights + 4);
  const v128_t vw89 = wasm_v128_load64_splat(weights + 8);

  const size_t input_decrement = round_up_po2(input_width, 4 * sizeof(float));

  const float* i0 = zero;
  const float* i1 = input;
  $for M in range(2, 2 + ROW_TILE):
    const float* i${M} = (const float*) ((uintptr_t) i${M-1} + input_width);

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

  size_t output_height = input_height;
  do {
    $for M in range(2, 2 + ROW_TILE):
      if XNN_UNPREDICTABLE(output_height < ${M}) {
        i${M} = zero;
        $if M <= ROW_TILE:
          o${M-1} = o${M-2};
      }

    $for M in range(2 + ROW_TILE):
      v128_t vi${M}x0123 = wasm_f32x4_const_splat(0.0f);

    $for M in range(2 + ROW_TILE):
      v128_t vi${M}x4567 = wasm_v128_load(i${M}); i${M} += 4;

    size_t w = input_width;
    for (; w > 4 * sizeof(float); w -= 4 * sizeof(float)) {
      $for M in range(ROW_TILE):
        v128_t vo${M}p0 = wasm_v32x4_shuffle(vw0123, vw0123, 0, 0, 0, 0);

      $for M in range(2 + ROW_TILE):
        const v128_t vi${M}x89AB = wasm_v128_load(i${M}); i${M} += 4;

      $for M in range(ROW_TILE):
        vo${M}p0 = wasm_f32x4_add(vo${M}p0, wasm_f32x4_mul(vi${M}x4567, wasm_v32x4_shuffle(vw0123, vw0123, 2, 2, 2, 2)));

      $for M in range(ROW_TILE):
        $if ACCUMULATORS >= 2:
          v128_t vo${M}p1 = wasm_f32x4_mul(vi${M+1}x4567, wasm_v32x4_shuffle(vw4567, vw4567, 1, 1, 1, 1));
        $else:
          vo${M}p0 = wasm_f32x4_add(vo${M}p0, wasm_f32x4_mul(vi${M+1}x4567, wasm_v32x4_shuffle(vw4567, vw4567, 1, 1, 1, 1)));

      $for M in range(ROW_TILE):
        $if ACCUMULATORS >= 3:
          v128_t vo${M}p2 = wasm_f32x4_mul(vi${M+2}x4567, wasm_v32x4_shuffle(vw89, vw89, 0, 0, 0, 0));
        $else:
          vo${M}p0 = wasm_f32x4_add(vo${M}p0, wasm_f32x4_mul(vi${M+2}x4567, wasm_v32x4_shuffle(vw89, vw89, 0, 0, 0, 0)));

      $for M in range(2 + ROW_TILE):
        const v128_t vi${M}x3456 = wasm_v32x4_shuffle(vi${M}x0123, vi${M}x4567, 3, 4, 5, 6);

      $for M in range(ROW_TILE):
        $if ACCUMULATORS >= 4:
          v128_t vo${M}p3 = wasm_f32x4_mul(vi${M}x3456, wasm_v32x4_shuffle(vw0123, vw0123, 1, 1, 1, 1));
        $else:
          vo${M}p${3 % ACCUMULATORS} = wasm_f32x4_add(vo${M}p${3 % ACCUMULATORS}, wasm_f32x4_mul(vi${M}x3456, wasm_v32x4_shuffle(vw0123, vw0123, 1, 1, 1, 1)));

      $for M in range(ROW_TILE):
        vo${M}p${4 % ACCUMULATORS} = wasm_f32x4_add(vo${M}p${4 % ACCUMULATORS}, wasm_f32x4_mul(vi${M+1}x3456, wasm_v32x4_shuffle(vw4567, vw4567, 0, 0, 0, 0)));

      $for M in range(ROW_TILE):
        vo${M}p${5 % ACCUMULATORS} = wasm_f32x4_add(vo${M}p${5 % ACCUMULATORS}, wasm_f32x4_mul(vi${M+2}x3456, wasm_v32x4_shuffle(vw4567, vw4567, 3, 3, 3, 3)));

      $for M in range(2 + ROW_TILE):
        vi${M}x0123 = vi${M}x4567;

      $for M in range(2 + ROW_TILE):
        const v128_t vi${M}x5678 = wasm_v32x4_shuffle(vi${M}x4567, vi${M}x89AB, 1, 2, 3, 4);

      $for M in range(ROW_TILE):
        vo${M}p${6 % ACCUMULATORS} = wasm_f32x4_add(vo${M}p${6 % ACCUMULATORS}, wasm_f32x4_mul(vi${M}x5678, wasm_v32x4_shuffle(vw0123, vw0123, 3, 3, 3, 3)));

      $for M in range(ROW_TILE):
        vo${M}p${7 % ACCUMULATORS} = wasm_f32x4_add(vo${M}p${7 % ACCUMULATORS}, wasm_f32x4_mul(vi${M+1}x5678, wasm_v32x4_shuffle(vw4567, vw4567, 2, 2, 2, 2)));

      $for M in range(ROW_TILE):
        vo${M}p${8 % ACCUMULATORS} = wasm_f32x4_add(vo${M}p${8 % ACCUMULATORS}, wasm_f32x4_mul(vi${M+2}x5678, wasm_v32x4_shuffle(vw89, vw89, 1, 1, 1, 1)));

      $for M in range(2 + ROW_TILE):
        vi${M}x4567 = vi${M}x89AB;

      $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${A} = wasm_f32x4_add(vo${M}p${A}, vo${M}p${A + ACC_SLICE});
          $ACC_SLICE *= 2

      $if X86:
        $for M in range(ROW_TILE):
          v128_t vo${M} = wasm_f32x4_pmax(vmin, vo${M}p0);
        $for M in range(ROW_TILE):
          vo${M} = wasm_f32x4_pmin(vmax, vo${M});
      $else:
        $for M in range(ROW_TILE):
          v128_t vo${M} = wasm_f32x4_max(vo${M}p0, vmin);
        $for M in range(ROW_TILE):
          vo${M} = wasm_f32x4_min(vo${M}, vmax);

      $for M in reversed(range(ROW_TILE)):
        wasm_v128_store(o${M}, vo${M}); o${M} += 4;
    }
    // Always process the last block of 1..4 pixels.
    assert(w >= 1 * sizeof(float));
    assert(w <= 4 * sizeof(float));
    {
      $for M in range(ROW_TILE):
        v128_t vo${M}p0 = wasm_v32x4_shuffle(vw0123, vw0123, 0, 0, 0, 0);

      $for M in range(2 + ROW_TILE):
        vi${M}x4567 = wasm_v128_and(vmask, vi${M}x4567);

      $for M in range(ROW_TILE):
        vo${M}p0 = wasm_f32x4_add(vo${M}p0, wasm_f32x4_mul(vi${M}x4567, wasm_v32x4_shuffle(vw0123, vw0123, 2, 2, 2, 2)));

      $for M in range(ROW_TILE):
        $if ACCUMULATORS >= 2:
          v128_t vo${M}p1 = wasm_f32x4_mul(vi${M+1}x4567, wasm_v32x4_shuffle(vw4567, vw4567, 1, 1, 1, 1));
        $else:
          vo${M}p0 = wasm_f32x4_add(vo${M}p0, wasm_f32x4_mul(vi${M+1}x4567, wasm_v32x4_shuffle(vw4567, vw4567, 1, 1, 1, 1)));

      $for M in range(ROW_TILE):
        $if ACCUMULATORS >= 3:
          v128_t vo${M}p2 = wasm_f32x4_mul(vi${M+2}x4567, wasm_v32x4_shuffle(vw89, vw89, 0, 0, 0, 0));
        $else:
          vo${M}p0 = wasm_f32x4_add(vo${M}p0, wasm_f32x4_mul(vi${M+2}x4567, wasm_v32x4_shuffle(vw89, vw89, 0, 0, 0, 0)));

      $for M in range(2 + ROW_TILE):
        const v128_t vi${M}x3456 = wasm_v32x4_shuffle(vi${M}x0123, vi${M}x4567, 3, 4, 5, 6);

      $for M in range(ROW_TILE):
        $if ACCUMULATORS >= 4:
          v128_t vo${M}p3 = wasm_f32x4_mul(vi${M}x3456, wasm_v32x4_shuffle(vw0123, vw0123, 1, 1, 1, 1));
        $else:
          vo${M}p${3 % ACCUMULATORS} = wasm_f32x4_add(vo${M}p${3 % ACCUMULATORS}, wasm_f32x4_mul(vi${M}x3456, wasm_v32x4_shuffle(vw0123, vw0123, 1, 1, 1, 1)));

      $for M in range(ROW_TILE):
        vo${M}p${4 % ACCUMULATORS} = wasm_f32x4_add(vo${M}p${4 % ACCUMULATORS}, wasm_f32x4_mul(vi${M+1}x3456, wasm_v32x4_shuffle(vw4567, vw4567, 0, 0, 0, 0)));

      $for M in range(ROW_TILE):
        vo${M}p${5 % ACCUMULATORS} = wasm_f32x4_add(vo${M}p${5 % ACCUMULATORS}, wasm_f32x4_mul(vi${M+2}x3456, wasm_v32x4_shuffle(vw4567, vw4567, 3, 3, 3, 3)));

      const v128_t vzero = wasm_f32x4_const_splat(0.0f);
      $for M in range(2 + ROW_TILE):
        const v128_t vi${M}x5678 = wasm_v32x4_shuffle(vi${M}x4567, vzero, 1, 2, 3, 4);

      $for M in range(ROW_TILE):
        vo${M}p${6 % ACCUMULATORS} = wasm_f32x4_add(vo${M}p${6 % ACCUMULATORS}, wasm_f32x4_mul(vi${M}x5678, wasm_v32x4_shuffle(vw0123, vw0123, 3, 3, 3, 3)));

      $for M in range(ROW_TILE):
        vo${M}p${7 % ACCUMULATORS} = wasm_f32x4_add(vo${M}p${7 % ACCUMULATORS}, wasm_f32x4_mul(vi${M+1}x5678, wasm_v32x4_shuffle(vw4567, vw4567, 2, 2, 2, 2)));

      $for M in range(ROW_TILE):
        vo${M}p${8 % ACCUMULATORS} = wasm_f32x4_add(vo${M}p${8 % ACCUMULATORS}, wasm_f32x4_mul(vi${M+2}x5678, wasm_v32x4_shuffle(vw89, vw89, 1, 1, 1, 1)));

      $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${A} = wasm_f32x4_add(vo${M}p${A}, vo${M}p${A + ACC_SLICE});
          $ACC_SLICE *= 2

      $if X86:
        $for M in range(ROW_TILE):
          v128_t vo${M} = wasm_f32x4_pmax(vmin, vo${M}p0);
        $for M in range(ROW_TILE):
          vo${M} = wasm_f32x4_pmin(vmax, vo${M});
      $else:
        $for M in range(ROW_TILE):
          v128_t vo${M} = wasm_f32x4_max(vo${M}p0, vmin);
        $for M in range(ROW_TILE):
          vo${M} = wasm_f32x4_min(vo${M}, vmax);

      if XNN_LIKELY(w == 4 * sizeof(float)) {
        $for M in reversed(range(ROW_TILE)):
          wasm_v128_store(o${M}, vo${M}); o${M} += 4;
      } else {
        if (w & (2 * sizeof(float))) {
          $for M in reversed(range(ROW_TILE)):
            wasm_v128_store64_lane(o${M}, vo${M}, 0);
            o${M} += 2;

          $for M in range(ROW_TILE):
            vo${M} = wasm_v64x2_shuffle(vo${M}, vo${M}, 1, 1);
        }
        if (w & (1 * sizeof(float))) {
          $for M in reversed(range(ROW_TILE)):
            wasm_v128_store32_lane(o${M}, vo${M}, 0);
            o${M} += 1;
        }
      }
    }

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

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