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// Copyright 2022 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 <immintrin.h>
#include <xnnpack/common.h>
#include <xnnpack/rmax.h>
void xnn_f16_rmax_ukernel__f16c(
size_t batch,
const void* input,
void* output) XNN_OOB_READS
{
assert(batch != 0);
assert(batch % sizeof(uint16_t) == 0);
assert(input != 0);
assert(output != 0);
const uint16_t* i = (const uint16_t*) input;
__m128i vmax_init = _mm_shufflelo_epi16(_mm_loadl_epi64((const __m128i*) i), _MM_SHUFFLE(0, 0, 0, 0));
vmax_init = _mm_unpacklo_epi64(vmax_init, vmax_init);
__m256 vmax0 = _mm256_cvtph_ps(vmax_init);
__m256 vmax1 = vmax0;
__m256 vmax2 = vmax0;
__m256 vmax3 = vmax0;
for (; batch >= 32 * sizeof(uint16_t); batch -= 32 * sizeof(uint16_t)) {
const __m256 vx0 = _mm256_cvtph_ps(_mm_loadu_si128((const __m128i*) i));
const __m256 vx1 = _mm256_cvtph_ps(_mm_loadu_si128((const __m128i*) (i + 8)));
const __m256 vx2 = _mm256_cvtph_ps(_mm_loadu_si128((const __m128i*) (i + 16)));
const __m256 vx3 = _mm256_cvtph_ps(_mm_loadu_si128((const __m128i*) (i + 24)));
i += 32;
vmax0 = _mm256_max_ps(vmax0, vx0);
vmax1 = _mm256_max_ps(vmax1, vx1);
vmax2 = _mm256_max_ps(vmax2, vx2);
vmax3 = _mm256_max_ps(vmax3, vx3);
}
__m256 vmax = _mm256_max_ps(_mm256_max_ps(vmax0, vmax1), _mm256_max_ps(vmax2, vmax3));
for (; batch >= 8 * sizeof(uint16_t); batch -= 8 * sizeof(uint16_t)) {
const __m256 vx = _mm256_cvtph_ps(_mm_loadu_si128((const __m128i*) i));
i += 8;
vmax = _mm256_max_ps(vmax, vx);
}
__m128 vmax_lo = _mm_max_ps(_mm256_castps256_ps128(vmax), _mm256_extractf128_ps(vmax, 1));
if XNN_UNLIKELY(batch != 0) {
const __m256 vx = _mm256_cvtph_ps(_mm_loadu_si128((const __m128i*) i));
__m128 vx_lo = _mm256_castps256_ps128(vx);
if (batch & (4 * sizeof(uint16_t))) {
vmax_lo = _mm_max_ps(vmax_lo, vx_lo);
vx_lo = _mm256_extractf128_ps(vx, 1);
}
if (batch & (2 * sizeof(uint16_t))) {
vmax_lo = _mm_blend_ps(_mm_max_ps(vmax_lo, vx_lo), vmax_lo, 0xC);
vx_lo = _mm_movehl_ps(vx_lo, vx_lo);
}
if (batch & (1 * sizeof(uint16_t))) {
vmax_lo = _mm_max_ss(vmax_lo, vx_lo);
}
}
vmax_lo = _mm_max_ps(vmax_lo, _mm_movehl_ps(vmax_lo, vmax_lo));
vmax_lo = _mm_max_ss(vmax_lo, _mm_movehdup_ps(vmax_lo));
*((uint16_t*) output) = (uint16_t) _mm_extract_epi16(_mm_cvtps_ph(vmax_lo, _MM_FROUND_TO_NEAREST_INT), 0);
}
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