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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.
#include <assert.h>
#include <wasm_simd128.h>
#include <xnnpack/argmaxpool.h>
void xnn_f32_argmaxpool_ukernel_4x__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_OOB_READS
{
assert(output_pixels != 0);
assert(pooling_elements != 0);
assert(pooling_elements <= 4);
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];
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);
if (pooling_elements < 2) {
i1 = i0;
}
if (pooling_elements <= 2) {
i2 = i0;
}
if (pooling_elements != 4) {
i3 = 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;
v128_t vmax = vi0;
v128_t vidx = wasm_i32x4_const_splat(0);
const v128_t vm1 = wasm_f32x4_gt(vi1, vmax);
vmax = wasm_v128_bitselect(vi1, vmax, vm1);
vidx = wasm_v128_bitselect(wasm_i32x4_const_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_const_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_const_splat(3), vidx, vm3);
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);
v128_t vmax = vi0;
v128_t vidx = wasm_i32x4_const_splat(0);
const v128_t vm1 = wasm_f32x4_gt(vi1, vmax);
vmax = wasm_v128_bitselect(vi1, vmax, vm1);
vidx = wasm_v128_bitselect(wasm_i32x4_const_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_const_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_const_splat(3), vidx, vm3);
if (c & 2) {
wasm_v128_store64_lane(output, vmax, 0);
wasm_v128_store64_lane(index, vidx, 0);
vmax = wasm_v64x2_shuffle(vmax, vmax, 1, 1);
vidx = wasm_v64x2_shuffle(vidx, vidx, 1, 1);
output += 2;
index += 2;
}
if (c & 1) {
wasm_v128_store32_lane(output, vmax, 0);
wasm_v128_store32_lane(index, vidx, 0);
output += 1;
index += 1;
}
}
input = (const float**) ((uintptr_t) input + input_increment);
output = (float*) ((uintptr_t) output + output_increment);
} while (--output_pixels != 0);
}
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