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// Copyright 2020 The libgav1 Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "src/dsp/motion_vector_search.h"
#include "src/utils/cpu.h"
#if LIBGAV1_TARGETING_SSE4_1
#include <smmintrin.h>
#include <cassert>
#include <cstddef>
#include <cstdint>
#include "src/dsp/constants.h"
#include "src/dsp/dsp.h"
#include "src/dsp/x86/common_sse4.h"
#include "src/utils/common.h"
#include "src/utils/constants.h"
#include "src/utils/types.h"
namespace libgav1 {
namespace dsp {
namespace {
constexpr int kProjectionMvDivisionLookup_32bit[kMaxFrameDistance + 1] = {
0, 16384, 8192, 5461, 4096, 3276, 2730, 2340, 2048, 1820, 1638,
1489, 1365, 1260, 1170, 1092, 1024, 963, 910, 862, 819, 780,
744, 712, 682, 655, 630, 606, 585, 564, 546, 528};
inline __m128i MvProjection(const __m128i mv, const __m128i denominator,
const __m128i numerator) {
const __m128i m0 = _mm_madd_epi16(mv, denominator);
const __m128i m = _mm_mullo_epi32(m0, numerator);
// Add the sign (0 or -1) to round towards zero.
const __m128i sign = _mm_srai_epi32(m, 31);
const __m128i add_sign = _mm_add_epi32(m, sign);
const __m128i sum = _mm_add_epi32(add_sign, _mm_set1_epi32(1 << 13));
return _mm_srai_epi32(sum, 14);
}
inline __m128i MvProjectionClip(const __m128i mvs[2],
const __m128i denominators[2],
const __m128i numerator) {
const __m128i s0 = MvProjection(mvs[0], denominators[0], numerator);
const __m128i s1 = MvProjection(mvs[1], denominators[1], numerator);
const __m128i mv = _mm_packs_epi32(s0, s1);
const __m128i projection_mv_clamp = _mm_set1_epi16(kProjectionMvClamp);
const __m128i projection_mv_clamp_negative =
_mm_set1_epi16(-kProjectionMvClamp);
const __m128i clamp = _mm_min_epi16(mv, projection_mv_clamp);
return _mm_max_epi16(clamp, projection_mv_clamp_negative);
}
inline __m128i MvProjectionCompoundClip(
const MotionVector* LIBGAV1_RESTRICT const temporal_mvs,
const int8_t temporal_reference_offsets[2],
const int reference_offsets[2]) {
const auto* const tmvs = reinterpret_cast<const int32_t*>(temporal_mvs);
const __m128i temporal_mv = LoadLo8(tmvs);
const __m128i temporal_mv_0 = _mm_cvtepu16_epi32(temporal_mv);
__m128i mvs[2], denominators[2];
mvs[0] = _mm_unpacklo_epi64(temporal_mv_0, temporal_mv_0);
mvs[1] = _mm_unpackhi_epi64(temporal_mv_0, temporal_mv_0);
denominators[0] = _mm_set1_epi32(
kProjectionMvDivisionLookup[temporal_reference_offsets[0]]);
denominators[1] = _mm_set1_epi32(
kProjectionMvDivisionLookup[temporal_reference_offsets[1]]);
const __m128i offsets = LoadLo8(reference_offsets);
const __m128i numerator = _mm_unpacklo_epi32(offsets, offsets);
return MvProjectionClip(mvs, denominators, numerator);
}
inline __m128i MvProjectionSingleClip(
const MotionVector* LIBGAV1_RESTRICT const temporal_mvs,
const int8_t* LIBGAV1_RESTRICT const temporal_reference_offsets,
const int reference_offset) {
const auto* const tmvs = reinterpret_cast<const int16_t*>(temporal_mvs);
const __m128i temporal_mv = LoadAligned16(tmvs);
__m128i lookup = _mm_cvtsi32_si128(
kProjectionMvDivisionLookup_32bit[temporal_reference_offsets[0]]);
lookup = _mm_insert_epi32(
lookup, kProjectionMvDivisionLookup_32bit[temporal_reference_offsets[1]],
1);
lookup = _mm_insert_epi32(
lookup, kProjectionMvDivisionLookup_32bit[temporal_reference_offsets[2]],
2);
lookup = _mm_insert_epi32(
lookup, kProjectionMvDivisionLookup_32bit[temporal_reference_offsets[3]],
3);
__m128i mvs[2], denominators[2];
mvs[0] = _mm_unpacklo_epi16(temporal_mv, _mm_setzero_si128());
mvs[1] = _mm_unpackhi_epi16(temporal_mv, _mm_setzero_si128());
denominators[0] = _mm_unpacklo_epi32(lookup, lookup);
denominators[1] = _mm_unpackhi_epi32(lookup, lookup);
const __m128i numerator = _mm_set1_epi32(reference_offset);
return MvProjectionClip(mvs, denominators, numerator);
}
inline void LowPrecision(const __m128i mv, void* const candidate_mvs) {
const __m128i kRoundDownMask = _mm_set1_epi16(~1);
const __m128i sign = _mm_srai_epi16(mv, 15);
const __m128i sub_sign = _mm_sub_epi16(mv, sign);
const __m128i d = _mm_and_si128(sub_sign, kRoundDownMask);
StoreAligned16(candidate_mvs, d);
}
inline void ForceInteger(const __m128i mv, void* const candidate_mvs) {
const __m128i kRoundDownMask = _mm_set1_epi16(~7);
const __m128i sign = _mm_srai_epi16(mv, 15);
const __m128i mv1 = _mm_add_epi16(mv, _mm_set1_epi16(3));
const __m128i mv2 = _mm_sub_epi16(mv1, sign);
const __m128i mv3 = _mm_and_si128(mv2, kRoundDownMask);
StoreAligned16(candidate_mvs, mv3);
}
void MvProjectionCompoundLowPrecision_SSE4_1(
const MotionVector* LIBGAV1_RESTRICT temporal_mvs,
const int8_t* LIBGAV1_RESTRICT temporal_reference_offsets,
const int reference_offsets[2], const int count,
CompoundMotionVector* LIBGAV1_RESTRICT candidate_mvs) {
// |reference_offsets| non-zero check usually equals true and is ignored.
// To facilitate the compilers, make a local copy of |reference_offsets|.
const int offsets[2] = {reference_offsets[0], reference_offsets[1]};
// One more element could be calculated.
int i = 0;
do {
const __m128i mv = MvProjectionCompoundClip(
temporal_mvs + i, temporal_reference_offsets + i, offsets);
LowPrecision(mv, candidate_mvs + i);
i += 2;
} while (i < count);
}
void MvProjectionCompoundForceInteger_SSE4_1(
const MotionVector* LIBGAV1_RESTRICT temporal_mvs,
const int8_t* LIBGAV1_RESTRICT temporal_reference_offsets,
const int reference_offsets[2], const int count,
CompoundMotionVector* LIBGAV1_RESTRICT candidate_mvs) {
// |reference_offsets| non-zero check usually equals true and is ignored.
// To facilitate the compilers, make a local copy of |reference_offsets|.
const int offsets[2] = {reference_offsets[0], reference_offsets[1]};
// One more element could be calculated.
int i = 0;
do {
const __m128i mv = MvProjectionCompoundClip(
temporal_mvs + i, temporal_reference_offsets + i, offsets);
ForceInteger(mv, candidate_mvs + i);
i += 2;
} while (i < count);
}
void MvProjectionCompoundHighPrecision_SSE4_1(
const MotionVector* LIBGAV1_RESTRICT temporal_mvs,
const int8_t* LIBGAV1_RESTRICT temporal_reference_offsets,
const int reference_offsets[2], const int count,
CompoundMotionVector* LIBGAV1_RESTRICT candidate_mvs) {
// |reference_offsets| non-zero check usually equals true and is ignored.
// To facilitate the compilers, make a local copy of |reference_offsets|.
const int offsets[2] = {reference_offsets[0], reference_offsets[1]};
// One more element could be calculated.
int i = 0;
do {
const __m128i mv = MvProjectionCompoundClip(
temporal_mvs + i, temporal_reference_offsets + i, offsets);
StoreAligned16(candidate_mvs + i, mv);
i += 2;
} while (i < count);
}
void MvProjectionSingleLowPrecision_SSE4_1(
const MotionVector* LIBGAV1_RESTRICT temporal_mvs,
const int8_t* LIBGAV1_RESTRICT temporal_reference_offsets,
const int reference_offset, const int count,
MotionVector* LIBGAV1_RESTRICT candidate_mvs) {
// Up to three more elements could be calculated.
int i = 0;
do {
const __m128i mv = MvProjectionSingleClip(
temporal_mvs + i, temporal_reference_offsets + i, reference_offset);
LowPrecision(mv, candidate_mvs + i);
i += 4;
} while (i < count);
}
void MvProjectionSingleForceInteger_SSE4_1(
const MotionVector* LIBGAV1_RESTRICT temporal_mvs,
const int8_t* LIBGAV1_RESTRICT temporal_reference_offsets,
const int reference_offset, const int count,
MotionVector* LIBGAV1_RESTRICT candidate_mvs) {
// Up to three more elements could be calculated.
int i = 0;
do {
const __m128i mv = MvProjectionSingleClip(
temporal_mvs + i, temporal_reference_offsets + i, reference_offset);
ForceInteger(mv, candidate_mvs + i);
i += 4;
} while (i < count);
}
void MvProjectionSingleHighPrecision_SSE4_1(
const MotionVector* LIBGAV1_RESTRICT temporal_mvs,
const int8_t* LIBGAV1_RESTRICT temporal_reference_offsets,
const int reference_offset, const int count,
MotionVector* LIBGAV1_RESTRICT candidate_mvs) {
// Up to three more elements could be calculated.
int i = 0;
do {
const __m128i mv = MvProjectionSingleClip(
temporal_mvs + i, temporal_reference_offsets + i, reference_offset);
StoreAligned16(candidate_mvs + i, mv);
i += 4;
} while (i < count);
}
} // namespace
void MotionVectorSearchInit_SSE4_1() {
Dsp* const dsp = dsp_internal::GetWritableDspTable(kBitdepth8);
assert(dsp != nullptr);
dsp->mv_projection_compound[0] = MvProjectionCompoundLowPrecision_SSE4_1;
dsp->mv_projection_compound[1] = MvProjectionCompoundForceInteger_SSE4_1;
dsp->mv_projection_compound[2] = MvProjectionCompoundHighPrecision_SSE4_1;
dsp->mv_projection_single[0] = MvProjectionSingleLowPrecision_SSE4_1;
dsp->mv_projection_single[1] = MvProjectionSingleForceInteger_SSE4_1;
dsp->mv_projection_single[2] = MvProjectionSingleHighPrecision_SSE4_1;
}
} // namespace dsp
} // namespace libgav1
#else // !LIBGAV1_TARGETING_SSE4_1
namespace libgav1 {
namespace dsp {
void MotionVectorSearchInit_SSE4_1() {}
} // namespace dsp
} // namespace libgav1
#endif // LIBGAV1_TARGETING_SSE4_1
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