text: // 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.
  
  #include <assert.h>
  
  #include <wasm_simd128.h>
  
  #include <xnnpack/argmaxpool.h>
  
  
  void xnn_f32_argmaxpool_ukernel_9x__wasmsimd_c4(
      size_t output_pixels,
      size_t pooling_elements,
      size_t channels,
      const float** input,
      size_t input_offset,
      float* output,
      uint32_t* index_ptr,
      size_t input_increment,
      size_t output_increment) XNN_DISABLE_TSAN
  {
    assert(output_pixels != 0);
    assert(pooling_elements != 0);
    assert(pooling_elements <= 9);
    assert(channels != 0);
  
    float* index = (float*) index_ptr;
    do {
      const float* i0 = input[0];
      const float* i1 = input[1];
      const float* i2 = input[2];
      const float* i3 = input[3];
      const float* i4 = input[4];
      const float* i5 = input[5];
      const float* i6 = input[6];
      const float* i7 = input[7];
      const float* i8 = input[8];
      i0 = (const float*) ((uintptr_t) i0 + input_offset);
      i1 = (const float*) ((uintptr_t) i1 + input_offset);
      i2 = (const float*) ((uintptr_t) i2 + input_offset);
      i3 = (const float*) ((uintptr_t) i3 + input_offset);
      i4 = (const float*) ((uintptr_t) i4 + input_offset);
      i5 = (const float*) ((uintptr_t) i5 + input_offset);
      i6 = (const float*) ((uintptr_t) i6 + input_offset);
      i7 = (const float*) ((uintptr_t) i7 + input_offset);
      i8 = (const float*) ((uintptr_t) i8 + input_offset);
      if (pooling_elements < 2) {
        i1 = i0;
      }
      if (pooling_elements <= 2) {
        i2 = i0;
      }
      if (pooling_elements < 4) {
        i3 = i0;
      }
      if (pooling_elements <= 4) {
        i4 = i0;
      }
      if (pooling_elements < 6) {
        i5 = i0;
      }
      if (pooling_elements <= 6) {
        i6 = i0;
      }
      if (pooling_elements < 8) {
        i7 = i0;
      }
      if (pooling_elements <= 8) {
        i8 = i0;
      }
  
      size_t c = channels;
      for (; c >= 4; c -= 4) {
        const v128_t vi0 = wasm_v128_load(i0);
        i0 += 4;
        const v128_t vi1 = wasm_v128_load(i1);
        i1 += 4;
        const v128_t vi2 = wasm_v128_load(i2);
        i2 += 4;
        const v128_t vi3 = wasm_v128_load(i3);
        i3 += 4;
        const v128_t vi4 = wasm_v128_load(i4);
        i4 += 4;
        const v128_t vi5 = wasm_v128_load(i5);
        i5 += 4;
        const v128_t vi6 = wasm_v128_load(i6);
        i6 += 4;
        const v128_t vi7 = wasm_v128_load(i7);
        i7 += 4;
        const v128_t vi8 = wasm_v128_load(i8);
        i8 += 4;
  
        v128_t vmax = vi0;
        v128_t vidx = wasm_f64x2_splat(0.0);
  
        const v128_t vm1 = wasm_f32x4_gt(vi1, vmax);
        vmax = wasm_v128_bitselect(vi1, vmax, vm1);
        vidx = wasm_v128_bitselect(wasm_i32x4_splat(1), vidx, vm1);
  
        const v128_t vm2 = wasm_f32x4_gt(vi2, vmax);
        vmax = wasm_v128_bitselect(vi2, vmax, vm2);
        vidx = wasm_v128_bitselect(wasm_i32x4_splat(2), vidx, vm2);
  
        const v128_t vm3 = wasm_f32x4_gt(vi3, vmax);
        vmax = wasm_v128_bitselect(vi3, vmax, vm3);
        vidx = wasm_v128_bitselect(wasm_i32x4_splat(3), vidx, vm3);
  
        const v128_t vm4 = wasm_f32x4_gt(vi4, vmax);
        vmax = wasm_v128_bitselect(vi4, vmax, vm4);
        vidx = wasm_v128_bitselect(wasm_i32x4_splat(4), vidx, vm4);
  
        const v128_t vm5 = wasm_f32x4_gt(vi5, vmax);
        vmax = wasm_v128_bitselect(vi5, vmax, vm5);
        vidx = wasm_v128_bitselect(wasm_i32x4_splat(5), vidx, vm5);
  
        const v128_t vm6 = wasm_f32x4_gt(vi6, vmax);
        vmax = wasm_v128_bitselect(vi6, vmax, vm6);
        vidx = wasm_v128_bitselect(wasm_i32x4_splat(6), vidx, vm6);
  
        const v128_t vm7 = wasm_f32x4_gt(vi7, vmax);
        vmax = wasm_v128_bitselect(vi7, vmax, vm7);
        vidx = wasm_v128_bitselect(wasm_i32x4_splat(7), vidx, vm7);
  
        const v128_t vm8 = wasm_f32x4_gt(vi8, vmax);
        vmax = wasm_v128_bitselect(vi8, vmax, vm8);
        vidx = wasm_v128_bitselect(wasm_i32x4_splat(8), vidx, vm8);
  
        wasm_v128_store(output, vmax);
        output += 4;
        wasm_v128_store(index, vidx);
        index += 4;
      }
      if (c != 0) {
        const v128_t vi0 = wasm_v128_load(i0);
        const v128_t vi1 = wasm_v128_load(i1);
        const v128_t vi2 = wasm_v128_load(i2);
        const v128_t vi3 = wasm_v128_load(i3);
        const v128_t vi4 = wasm_v128_load(i4);
        const v128_t vi5 = wasm_v128_load(i5);
        const v128_t vi6 = wasm_v128_load(i6);
        const v128_t vi7 = wasm_v128_load(i7);
        const v128_t vi8 = wasm_v128_load(i8);
  
        v128_t vmax = vi0;
        v128_t vidx = wasm_f64x2_splat(0.0);
  
        const v128_t vm1 = wasm_f32x4_gt(vi1, vmax);
        vmax = wasm_v128_bitselect(vi1, vmax, vm1);
        vidx = wasm_v128_bitselect(wasm_i32x4_splat(1), vidx, vm1);
  
        const v128_t vm2 = wasm_f32x4_gt(vi2, vmax);
        vmax = wasm_v128_bitselect(vi2, vmax, vm2);
        vidx = wasm_v128_bitselect(wasm_i32x4_splat(2), vidx, vm2);
  
        const v128_t vm3 = wasm_f32x4_gt(vi3, vmax);
        vmax = wasm_v128_bitselect(vi3, vmax, vm3);
        vidx = wasm_v128_bitselect(wasm_i32x4_splat(3), vidx, vm3);
  
        const v128_t vm4 = wasm_f32x4_gt(vi4, vmax);
        vmax = wasm_v128_bitselect(vi4, vmax, vm4);
        vidx = wasm_v128_bitselect(wasm_i32x4_splat(4), vidx, vm4);
  
        const v128_t vm5 = wasm_f32x4_gt(vi5, vmax);
        vmax = wasm_v128_bitselect(vi5, vmax, vm5);
        vidx = wasm_v128_bitselect(wasm_i32x4_splat(5), vidx, vm5);
  
        const v128_t vm6 = wasm_f32x4_gt(vi6, vmax);
        vmax = wasm_v128_bitselect(vi6, vmax, vm6);
        vidx = wasm_v128_bitselect(wasm_i32x4_splat(6), vidx, vm6);
  
        const v128_t vm7 = wasm_f32x4_gt(vi7, vmax);
        vmax = wasm_v128_bitselect(vi7, vmax, vm7);
        vidx = wasm_v128_bitselect(wasm_i32x4_splat(7), vidx, vm7);
  
        const v128_t vm8 = wasm_f32x4_gt(vi8, vmax);
        vmax = wasm_v128_bitselect(vi8, vmax, vm8);
        vidx = wasm_v128_bitselect(wasm_i32x4_splat(8), vidx, vm8);
  
        if (c & 2) {
          *((double*) output) = wasm_f64x2_extract_lane(vmax, 0);
          *((double*) index) = wasm_f64x2_extract_lane(vidx, 0);
          vmax = wasm_v32x4_shuffle(vmax, vmax, 2, 3, 2, 3);
          vidx = wasm_v32x4_shuffle(vidx, vidx, 2, 3, 2, 3);
          output += 2;
          index += 2;
        }
        if (c & 1) {
          *output++ = wasm_f32x4_extract_lane(vmax, 0);
          *index++ = wasm_f32x4_extract_lane(vidx, 0);
        }
      }
      input = (const float**) ((uintptr_t) input + input_increment);
      output = (float*) ((uintptr_t) output + output_increment);
    } while (--output_pixels != 0);
  }
  