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ProcessRGB_AVX2.cpp
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ProcessRGB_AVX2.cpp
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#ifdef __SSE4_1__
#include <array>
#include <string.h>
#include "Math.hpp"
#include "ProcessCommon.hpp"
#include "ProcessRGB_AVX2.hpp"
#include "Tables.hpp"
#include "Types.hpp"
#include "Vector.hpp"
#ifdef _MSC_VER
# include <intrin.h>
# include <Windows.h>
# define _bswap(x) _byteswap_ulong(x)
# define VS_VECTORCALL _vectorcall
#else
# include <x86intrin.h>
# pragma GCC push_options
# pragma GCC target ("avx2,fma,bmi2")
# define VS_VECTORCALL
#endif
#define noexcept
#define alignas(n) __declspec(align(n))
namespace
{
#ifdef _MSC_VER
inline unsigned long _bit_scan_forward( unsigned long mask )
{
unsigned long ret;
_BitScanForward( &ret, mask );
return ret;
}
#endif
typedef std::array<uint16, 4> v4i;
__m256i VS_VECTORCALL Sum4_AVX2( const uint8* data) noexcept
{
__m128i d0 = _mm_loadu_si128(((__m128i*)data) + 0);
__m128i d1 = _mm_loadu_si128(((__m128i*)data) + 1);
__m128i d2 = _mm_loadu_si128(((__m128i*)data) + 2);
__m128i d3 = _mm_loadu_si128(((__m128i*)data) + 3);
__m128i dm0 = _mm_and_si128(d0, _mm_set1_epi32(0x00FFFFFF));
__m128i dm1 = _mm_and_si128(d1, _mm_set1_epi32(0x00FFFFFF));
__m128i dm2 = _mm_and_si128(d2, _mm_set1_epi32(0x00FFFFFF));
__m128i dm3 = _mm_and_si128(d3, _mm_set1_epi32(0x00FFFFFF));
__m256i t0 = _mm256_cvtepu8_epi16(dm0);
__m256i t1 = _mm256_cvtepu8_epi16(dm1);
__m256i t2 = _mm256_cvtepu8_epi16(dm2);
__m256i t3 = _mm256_cvtepu8_epi16(dm3);
__m256i sum0 = _mm256_add_epi16(t0, t1);
__m256i sum1 = _mm256_add_epi16(t2, t3);
__m256i s0 = _mm256_permute2x128_si256(sum0, sum1, (0) | (3 << 4)); // 0, 0, 3, 3
__m256i s1 = _mm256_permute2x128_si256(sum0, sum1, (1) | (2 << 4)); // 1, 1, 2, 2
__m256i s2 = _mm256_permute4x64_epi64(s0, _MM_SHUFFLE(1, 3, 0, 2));
__m256i s3 = _mm256_permute4x64_epi64(s0, _MM_SHUFFLE(0, 2, 1, 3));
__m256i s4 = _mm256_permute4x64_epi64(s1, _MM_SHUFFLE(3, 1, 0, 2));
__m256i s5 = _mm256_permute4x64_epi64(s1, _MM_SHUFFLE(2, 0, 1, 3));
__m256i sum5 = _mm256_add_epi16(s2, s3); // 3, 0, 3, 0
__m256i sum6 = _mm256_add_epi16(s4, s5); // 2, 1, 1, 2
return _mm256_add_epi16(sum5, sum6); // 3+2, 0+1, 3+1, 3+2
}
__m256i VS_VECTORCALL Average_AVX2( const __m256i data) noexcept
{
__m256i a = _mm256_add_epi16(data, _mm256_set1_epi16(4));
return _mm256_srli_epi16(a, 3);
}
__m128i VS_VECTORCALL CalcErrorBlock_AVX2( const __m256i data, const v4i a[8]) noexcept
{
//
__m256i a0 = _mm256_load_si256((__m256i*)a[0].data());
__m256i a1 = _mm256_load_si256((__m256i*)a[4].data());
// err = 8 * ( sq( average[0] ) + sq( average[1] ) + sq( average[2] ) );
__m256i a4 = _mm256_madd_epi16(a0, a0);
__m256i a5 = _mm256_madd_epi16(a1, a1);
__m256i a6 = _mm256_hadd_epi32(a4, a5);
__m256i a7 = _mm256_slli_epi32(a6, 3);
__m256i a8 = _mm256_add_epi32(a7, _mm256_set1_epi32(0x3FFFFFFF)); // Big value to prevent negative values, but small enough to prevent overflow
// average is not swapped
// err -= block[0] * 2 * average[0];
// err -= block[1] * 2 * average[1];
// err -= block[2] * 2 * average[2];
__m256i a2 = _mm256_slli_epi16(a0, 1);
__m256i a3 = _mm256_slli_epi16(a1, 1);
__m256i b0 = _mm256_madd_epi16(a2, data);
__m256i b1 = _mm256_madd_epi16(a3, data);
__m256i b2 = _mm256_hadd_epi32(b0, b1);
__m256i b3 = _mm256_sub_epi32(a8, b2);
__m256i b4 = _mm256_hadd_epi32(b3, b3);
__m256i b5 = _mm256_permutevar8x32_epi32(b4, _mm256_set_epi32(0, 0, 0, 0, 5, 1, 4, 0));
return _mm256_castsi256_si128(b5);
}
void VS_VECTORCALL ProcessAverages_AVX2(const __m256i d, v4i a[8] ) noexcept
{
__m256i t = _mm256_add_epi16(_mm256_mullo_epi16(d, _mm256_set1_epi16(31)), _mm256_set1_epi16(128));
__m256i c = _mm256_srli_epi16(_mm256_add_epi16(t, _mm256_srli_epi16(t, 8)), 8);
__m256i c1 = _mm256_shuffle_epi32(c, _MM_SHUFFLE(3, 2, 3, 2));
__m256i diff = _mm256_sub_epi16(c, c1);
diff = _mm256_max_epi16(diff, _mm256_set1_epi16(-4));
diff = _mm256_min_epi16(diff, _mm256_set1_epi16(3));
__m256i co = _mm256_add_epi16(c1, diff);
c = _mm256_blend_epi16(co, c, 0xF0);
__m256i a0 = _mm256_or_si256(_mm256_slli_epi16(c, 3), _mm256_srli_epi16(c, 2));
_mm256_store_si256((__m256i*)a[4].data(), a0);
__m256i t0 = _mm256_add_epi16(_mm256_mullo_epi16(d, _mm256_set1_epi16(15)), _mm256_set1_epi16(128));
__m256i t1 = _mm256_srli_epi16(_mm256_add_epi16(t0, _mm256_srli_epi16(t0, 8)), 8);
__m256i t2 = _mm256_or_si256(t1, _mm256_slli_epi16(t1, 4));
_mm256_store_si256((__m256i*)a[0].data(), t2);
}
uint64 VS_VECTORCALL EncodeAverages_AVX2( const v4i a[8], size_t idx ) noexcept
{
uint64 d = ( idx << 24 );
size_t base = idx << 1;
__m128i a0 = _mm_load_si128((const __m128i*)a[base].data());
__m128i r0, r1;
if( ( idx & 0x2 ) == 0 )
{
r0 = _mm_srli_epi16(a0, 4);
__m128i a1 = _mm_unpackhi_epi64(r0, r0);
r1 = _mm_slli_epi16(a1, 4);
}
else
{
__m128i a1 = _mm_and_si128(a0, _mm_set1_epi16(-8));
r0 = _mm_unpackhi_epi64(a1, a1);
__m128i a2 = _mm_sub_epi16(a1, r0);
__m128i a3 = _mm_srai_epi16(a2, 3);
r1 = _mm_and_si128(a3, _mm_set1_epi16(0x07));
}
__m128i r2 = _mm_or_si128(r0, r1);
// do missing swap for average values
__m128i r3 = _mm_shufflelo_epi16(r2, _MM_SHUFFLE(3, 0, 1, 2));
__m128i r4 = _mm_packus_epi16(r3, _mm_setzero_si128());
d |= _mm_cvtsi128_si32(r4);
return d;
}
uint64 VS_VECTORCALL CheckSolid_AVX2( const uint8* src ) noexcept
{
__m256i d0 = _mm256_loadu_si256(((__m256i*)src) + 0);
__m256i d1 = _mm256_loadu_si256(((__m256i*)src) + 1);
__m256i c = _mm256_broadcastd_epi32(_mm256_castsi256_si128(d0));
__m256i c0 = _mm256_cmpeq_epi8(d0, c);
__m256i c1 = _mm256_cmpeq_epi8(d1, c);
__m256i m = _mm256_and_si256(c0, c1);
if (!_mm256_testc_si256(m, _mm256_set1_epi32(-1)))
{
return 0;
}
return 0x02000000 |
( uint( src[0] & 0xF8 ) << 16 ) |
( uint( src[1] & 0xF8 ) << 8 ) |
( uint( src[2] & 0xF8 ) );
}
__m128i VS_VECTORCALL PrepareAverages_AVX2( v4i a[8], const uint8* src) noexcept
{
__m256i sum4 = Sum4_AVX2( src );
ProcessAverages_AVX2(Average_AVX2( sum4 ), a );
return CalcErrorBlock_AVX2( sum4, a);
}
__m128i VS_VECTORCALL PrepareAverages_AVX2( v4i a[8], const __m256i sum4) noexcept
{
ProcessAverages_AVX2(Average_AVX2( sum4 ), a );
return CalcErrorBlock_AVX2( sum4, a);
}
void VS_VECTORCALL FindBestFit_4x2_AVX2( uint32 terr[2][8], uint32 tsel[8], v4i a[8], const uint32 offset, const uint8* data) noexcept
{
__m256i sel0 = _mm256_setzero_si256();
__m256i sel1 = _mm256_setzero_si256();
for (uint j = 0; j < 2; ++j)
{
uint bid = offset + 1 - j;
__m256i squareErrorSum = _mm256_setzero_si256();
__m128i a0 = _mm_loadl_epi64((const __m128i*)a[bid].data());
__m256i a1 = _mm256_broadcastq_epi64(a0);
// Processing one full row each iteration
for (size_t i = 0; i < 8; i += 4)
{
__m128i rgb = _mm_loadu_si128((const __m128i*)(data + i * 4));
__m256i rgb16 = _mm256_cvtepu8_epi16(rgb);
__m256i d = _mm256_sub_epi16(a1, rgb16);
// The scaling values are divided by two and rounded, to allow the differences to be in the range of signed int16
// This produces slightly different results, but is significant faster
__m256i pixel0 = _mm256_madd_epi16(d, _mm256_set_epi16(0, 38, 76, 14, 0, 38, 76, 14, 0, 38, 76, 14, 0, 38, 76, 14));
__m256i pixel1 = _mm256_packs_epi32(pixel0, pixel0);
__m256i pixel2 = _mm256_hadd_epi16(pixel1, pixel1);
__m128i pixel3 = _mm256_castsi256_si128(pixel2);
__m128i pix0 = _mm_broadcastw_epi16(pixel3);
__m128i pix1 = _mm_broadcastw_epi16(_mm_srli_epi32(pixel3, 16));
__m256i pixel = _mm256_insertf128_si256(_mm256_castsi128_si256(pix0), pix1, 1);
// Processing first two pixels of the row
{
__m256i pix = _mm256_abs_epi16(pixel);
// Taking the absolute value is way faster. The values are only used to sort, so the result will be the same.
// Since the selector table is symmetrical, we need to calculate the difference only for half of the entries.
__m256i error0 = _mm256_abs_epi16(_mm256_sub_epi16(pix, _mm256_broadcastsi128_si256(g_table128_SIMD[0])));
__m256i error1 = _mm256_abs_epi16(_mm256_sub_epi16(pix, _mm256_broadcastsi128_si256(g_table128_SIMD[1])));
__m256i minIndex0 = _mm256_and_si256(_mm256_cmpgt_epi16(error0, error1), _mm256_set1_epi16(1));
__m256i minError = _mm256_min_epi16(error0, error1);
// Exploiting symmetry of the selector table and use the sign bit
// This produces slightly different results, but is significant faster
__m256i minIndex1 = _mm256_srli_epi16(pixel, 15);
// Interleaving values so madd instruction can be used
__m256i minErrorLo = _mm256_permute4x64_epi64(minError, _MM_SHUFFLE(1, 1, 0, 0));
__m256i minErrorHi = _mm256_permute4x64_epi64(minError, _MM_SHUFFLE(3, 3, 2, 2));
__m256i minError2 = _mm256_unpacklo_epi16(minErrorLo, minErrorHi);
// Squaring the minimum error to produce correct values when adding
__m256i squareError = _mm256_madd_epi16(minError2, minError2);
squareErrorSum = _mm256_add_epi32(squareErrorSum, squareError);
// Packing selector bits
__m256i minIndexLo2 = _mm256_sll_epi16(minIndex0, _mm_cvtsi64x_si128(i + j * 8));
__m256i minIndexHi2 = _mm256_sll_epi16(minIndex1, _mm_cvtsi64x_si128(i + j * 8));
sel0 = _mm256_or_si256(sel0, minIndexLo2);
sel1 = _mm256_or_si256(sel1, minIndexHi2);
}
pixel3 = _mm256_extracti128_si256(pixel2, 1);
pix0 = _mm_broadcastw_epi16(pixel3);
pix1 = _mm_broadcastw_epi16(_mm_srli_epi32(pixel3, 16));
pixel = _mm256_insertf128_si256(_mm256_castsi128_si256(pix0), pix1, 1);
// Processing second two pixels of the row
{
__m256i pix = _mm256_abs_epi16(pixel);
// Taking the absolute value is way faster. The values are only used to sort, so the result will be the same.
// Since the selector table is symmetrical, we need to calculate the difference only for half of the entries.
__m256i error0 = _mm256_abs_epi16(_mm256_sub_epi16(pix, _mm256_broadcastsi128_si256(g_table128_SIMD[0])));
__m256i error1 = _mm256_abs_epi16(_mm256_sub_epi16(pix, _mm256_broadcastsi128_si256(g_table128_SIMD[1])));
__m256i minIndex0 = _mm256_and_si256(_mm256_cmpgt_epi16(error0, error1), _mm256_set1_epi16(1));
__m256i minError = _mm256_min_epi16(error0, error1);
// Exploiting symmetry of the selector table and use the sign bit
__m256i minIndex1 = _mm256_srli_epi16(pixel, 15);
// Interleaving values so madd instruction can be used
__m256i minErrorLo = _mm256_permute4x64_epi64(minError, _MM_SHUFFLE(1, 1, 0, 0));
__m256i minErrorHi = _mm256_permute4x64_epi64(minError, _MM_SHUFFLE(3, 3, 2, 2));
__m256i minError2 = _mm256_unpacklo_epi16(minErrorLo, minErrorHi);
// Squaring the minimum error to produce correct values when adding
__m256i squareError = _mm256_madd_epi16(minError2, minError2);
squareErrorSum = _mm256_add_epi32(squareErrorSum, squareError);
// Packing selector bits
__m256i minIndexLo2 = _mm256_sll_epi16(minIndex0, _mm_cvtsi64x_si128(i + j * 8));
__m256i minIndexHi2 = _mm256_sll_epi16(minIndex1, _mm_cvtsi64x_si128(i + j * 8));
__m256i minIndexLo3 = _mm256_slli_epi16(minIndexLo2, 2);
__m256i minIndexHi3 = _mm256_slli_epi16(minIndexHi2, 2);
sel0 = _mm256_or_si256(sel0, minIndexLo3);
sel1 = _mm256_or_si256(sel1, minIndexHi3);
}
}
data += 8 * 4;
_mm256_store_si256((__m256i*)terr[1 - j], squareErrorSum);
}
// Interleave selector bits
__m256i minIndexLo0 = _mm256_unpacklo_epi16(sel0, sel1);
__m256i minIndexHi0 = _mm256_unpackhi_epi16(sel0, sel1);
__m256i minIndexLo1 = _mm256_permute2x128_si256(minIndexLo0, minIndexHi0, (0) | (2 << 4));
__m256i minIndexHi1 = _mm256_permute2x128_si256(minIndexLo0, minIndexHi0, (1) | (3 << 4));
__m256i minIndexHi2 = _mm256_slli_epi32(minIndexHi1, 1);
__m256i sel = _mm256_or_si256(minIndexLo1, minIndexHi2);
_mm256_store_si256((__m256i*)tsel, sel);
}
void VS_VECTORCALL FindBestFit_2x4_AVX2( uint32 terr[2][8], uint32 tsel[8], v4i a[8], const uint32 offset, const uint8* data) noexcept
{
__m256i sel0 = _mm256_setzero_si256();
__m256i sel1 = _mm256_setzero_si256();
__m256i squareErrorSum0 = _mm256_setzero_si256();
__m256i squareErrorSum1 = _mm256_setzero_si256();
__m128i a0 = _mm_loadl_epi64((const __m128i*)a[offset + 1].data());
__m128i a1 = _mm_loadl_epi64((const __m128i*)a[offset + 0].data());
__m128i a2 = _mm_broadcastq_epi64(a0);
__m128i a3 = _mm_broadcastq_epi64(a1);
__m256i a4 = _mm256_insertf128_si256(_mm256_castsi128_si256(a2), a3, 1);
// Processing one full row each iteration
for (size_t i = 0; i < 16; i += 4)
{
__m128i rgb = _mm_loadu_si128((const __m128i*)(data + i * 4));
__m256i rgb16 = _mm256_cvtepu8_epi16(rgb);
__m256i d = _mm256_sub_epi16(a4, rgb16);
// The scaling values are divided by two and rounded, to allow the differences to be in the range of signed int16
// This produces slightly different results, but is significant faster
__m256i pixel0 = _mm256_madd_epi16(d, _mm256_set_epi16(0, 38, 76, 14, 0, 38, 76, 14, 0, 38, 76, 14, 0, 38, 76, 14));
__m256i pixel1 = _mm256_packs_epi32(pixel0, pixel0);
__m256i pixel2 = _mm256_hadd_epi16(pixel1, pixel1);
__m128i pixel3 = _mm256_castsi256_si128(pixel2);
__m128i pix0 = _mm_broadcastw_epi16(pixel3);
__m128i pix1 = _mm_broadcastw_epi16(_mm_srli_epi32(pixel3, 16));
__m256i pixel = _mm256_insertf128_si256(_mm256_castsi128_si256(pix0), pix1, 1);
// Processing first two pixels of the row
{
__m256i pix = _mm256_abs_epi16(pixel);
// Taking the absolute value is way faster. The values are only used to sort, so the result will be the same.
// Since the selector table is symmetrical, we need to calculate the difference only for half of the entries.
__m256i error0 = _mm256_abs_epi16(_mm256_sub_epi16(pix, _mm256_broadcastsi128_si256(g_table128_SIMD[0])));
__m256i error1 = _mm256_abs_epi16(_mm256_sub_epi16(pix, _mm256_broadcastsi128_si256(g_table128_SIMD[1])));
__m256i minIndex0 = _mm256_and_si256(_mm256_cmpgt_epi16(error0, error1), _mm256_set1_epi16(1));
__m256i minError = _mm256_min_epi16(error0, error1);
// Exploiting symmetry of the selector table and use the sign bit
__m256i minIndex1 = _mm256_srli_epi16(pixel, 15);
// Interleaving values so madd instruction can be used
__m256i minErrorLo = _mm256_permute4x64_epi64(minError, _MM_SHUFFLE(1, 1, 0, 0));
__m256i minErrorHi = _mm256_permute4x64_epi64(minError, _MM_SHUFFLE(3, 3, 2, 2));
__m256i minError2 = _mm256_unpacklo_epi16(minErrorLo, minErrorHi);
// Squaring the minimum error to produce correct values when adding
__m256i squareError = _mm256_madd_epi16(minError2, minError2);
squareErrorSum0 = _mm256_add_epi32(squareErrorSum0, squareError);
// Packing selector bits
__m256i minIndexLo2 = _mm256_sll_epi16(minIndex0, _mm_cvtsi64x_si128(i));
__m256i minIndexHi2 = _mm256_sll_epi16(minIndex1, _mm_cvtsi64x_si128(i));
sel0 = _mm256_or_si256(sel0, minIndexLo2);
sel1 = _mm256_or_si256(sel1, minIndexHi2);
}
pixel3 = _mm256_extracti128_si256(pixel2, 1);
pix0 = _mm_broadcastw_epi16(pixel3);
pix1 = _mm_broadcastw_epi16(_mm_srli_epi32(pixel3, 16));
pixel = _mm256_insertf128_si256(_mm256_castsi128_si256(pix0), pix1, 1);
// Processing second two pixels of the row
{
__m256i pix = _mm256_abs_epi16(pixel);
// Taking the absolute value is way faster. The values are only used to sort, so the result will be the same.
// Since the selector table is symmetrical, we need to calculate the difference only for half of the entries.
__m256i error0 = _mm256_abs_epi16(_mm256_sub_epi16(pix, _mm256_broadcastsi128_si256(g_table128_SIMD[0])));
__m256i error1 = _mm256_abs_epi16(_mm256_sub_epi16(pix, _mm256_broadcastsi128_si256(g_table128_SIMD[1])));
__m256i minIndex0 = _mm256_and_si256(_mm256_cmpgt_epi16(error0, error1), _mm256_set1_epi16(1));
__m256i minError = _mm256_min_epi16(error0, error1);
// Exploiting symmetry of the selector table and use the sign bit
__m256i minIndex1 = _mm256_srli_epi16(pixel, 15);
// Interleaving values so madd instruction can be used
__m256i minErrorLo = _mm256_permute4x64_epi64(minError, _MM_SHUFFLE(1, 1, 0, 0));
__m256i minErrorHi = _mm256_permute4x64_epi64(minError, _MM_SHUFFLE(3, 3, 2, 2));
__m256i minError2 = _mm256_unpacklo_epi16(minErrorLo, minErrorHi);
// Squaring the minimum error to produce correct values when adding
__m256i squareError = _mm256_madd_epi16(minError2, minError2);
squareErrorSum1 = _mm256_add_epi32(squareErrorSum1, squareError);
// Packing selector bits
__m256i minIndexLo2 = _mm256_sll_epi16(minIndex0, _mm_cvtsi64x_si128(i));
__m256i minIndexHi2 = _mm256_sll_epi16(minIndex1, _mm_cvtsi64x_si128(i));
__m256i minIndexLo3 = _mm256_slli_epi16(minIndexLo2, 2);
__m256i minIndexHi3 = _mm256_slli_epi16(minIndexHi2, 2);
sel0 = _mm256_or_si256(sel0, minIndexLo3);
sel1 = _mm256_or_si256(sel1, minIndexHi3);
}
}
_mm256_store_si256((__m256i*)terr[1], squareErrorSum0);
_mm256_store_si256((__m256i*)terr[0], squareErrorSum1);
// Interleave selector bits
__m256i minIndexLo0 = _mm256_unpacklo_epi16(sel0, sel1);
__m256i minIndexHi0 = _mm256_unpackhi_epi16(sel0, sel1);
__m256i minIndexLo1 = _mm256_permute2x128_si256(minIndexLo0, minIndexHi0, (0) | (2 << 4));
__m256i minIndexHi1 = _mm256_permute2x128_si256(minIndexLo0, minIndexHi0, (1) | (3 << 4));
__m256i minIndexHi2 = _mm256_slli_epi32(minIndexHi1, 1);
__m256i sel = _mm256_or_si256(minIndexLo1, minIndexHi2);
_mm256_store_si256((__m256i*)tsel, sel);
}
uint64 VS_VECTORCALL EncodeSelectors_AVX2( uint64 d, const uint32 terr[2][8], const uint32 tsel[8], const bool rotate) noexcept
{
size_t tidx[2];
// Get index of minimum error (terr[0] and terr[1])
__m256i err0 = _mm256_load_si256((const __m256i*)terr[0]);
__m256i err1 = _mm256_load_si256((const __m256i*)terr[1]);
__m256i errLo = _mm256_permute2x128_si256(err0, err1, (0) | (2 << 4));
__m256i errHi = _mm256_permute2x128_si256(err0, err1, (1) | (3 << 4));
__m256i errMin0 = _mm256_min_epu32(errLo, errHi);
__m256i errMin1 = _mm256_shuffle_epi32(errMin0, _MM_SHUFFLE(2, 3, 0, 1));
__m256i errMin2 = _mm256_min_epu32(errMin0, errMin1);
__m256i errMin3 = _mm256_shuffle_epi32(errMin2, _MM_SHUFFLE(1, 0, 3, 2));
__m256i errMin4 = _mm256_min_epu32(errMin3, errMin2);
__m256i errMin5 = _mm256_permute2x128_si256(errMin4, errMin4, (0) | (0 << 4));
__m256i errMin6 = _mm256_permute2x128_si256(errMin4, errMin4, (1) | (1 << 4));
__m256i errMask0 = _mm256_cmpeq_epi32(errMin5, err0);
__m256i errMask1 = _mm256_cmpeq_epi32(errMin6, err1);
uint32 mask0 = _mm256_movemask_epi8(errMask0);
uint32 mask1 = _mm256_movemask_epi8(errMask1);
tidx[0] = _bit_scan_forward(mask0) >> 2;
tidx[1] = _bit_scan_forward(mask1) >> 2;
d |= tidx[0] << 26;
d |= tidx[1] << 29;
uint t0 = tsel[tidx[0]];
uint t1 = tsel[tidx[1]];
if (!rotate)
{
t0 &= 0xFF00FF00;
t1 &= 0x00FF00FF;
}
else
{
t0 &= 0xCCCCCCCC;
t1 &= 0x33333333;
}
// Flip selectors from sign bit
uint t2 = (t0 | t1) ^ 0xFFFF0000;
return d | static_cast<uint64>(_bswap(t2)) << 32;
}
__m128i VS_VECTORCALL r6g7b6_AVX2(__m128 cof, __m128 chf, __m128 cvf) noexcept
{
__m128i co = _mm_cvttps_epi32(cof);
__m128i ch = _mm_cvttps_epi32(chf);
__m128i cv = _mm_cvttps_epi32(cvf);
__m128i coh = _mm_packus_epi32(co, ch);
__m128i cv0 = _mm_packus_epi32(cv, _mm_setzero_si128());
__m256i cohv0 = _mm256_inserti128_si256(_mm256_castsi128_si256(coh), cv0, 1);
__m256i cohv1 = _mm256_min_epu16(cohv0, _mm256_set1_epi16(1023));
__m256i cohv2 = _mm256_sub_epi16(cohv1, _mm256_set1_epi16(15));
__m256i cohv3 = _mm256_srai_epi16(cohv2, 1);
__m256i cohvrb0 = _mm256_add_epi16(cohv3, _mm256_set1_epi16(11));
__m256i cohvrb1 = _mm256_add_epi16(cohv3, _mm256_set1_epi16(4));
__m256i cohvg0 = _mm256_add_epi16(cohv3, _mm256_set1_epi16(9));
__m256i cohvg1 = _mm256_add_epi16(cohv3, _mm256_set1_epi16(6));
__m256i cohvrb2 = _mm256_srai_epi16(cohvrb0, 7);
__m256i cohvrb3 = _mm256_srai_epi16(cohvrb1, 7);
__m256i cohvg2 = _mm256_srai_epi16(cohvg0, 8);
__m256i cohvg3 = _mm256_srai_epi16(cohvg1, 8);
__m256i cohvrb4 = _mm256_sub_epi16(cohvrb0, cohvrb2);
__m256i cohvrb5 = _mm256_sub_epi16(cohvrb4, cohvrb3);
__m256i cohvg4 = _mm256_sub_epi16(cohvg0, cohvg2);
__m256i cohvg5 = _mm256_sub_epi16(cohvg4, cohvg3);
__m256i cohvrb6 = _mm256_srai_epi16(cohvrb5, 3);
__m256i cohvg6 = _mm256_srai_epi16(cohvg5, 2);
__m256i cohv4 = _mm256_blend_epi16(cohvg6, cohvrb6, 0x55);
__m128i cohv5 = _mm_packus_epi16(_mm256_castsi256_si128(cohv4), _mm256_extracti128_si256(cohv4, 1));
return _mm_shuffle_epi8(cohv5, _mm_setr_epi8(6, 5, 4, -1, 2, 1, 0, -1, 10, 9, 8, -1, -1, -1, -1, -1));
}
struct Plane
{
uint64 plane;
uint64 error;
__m256i sum4;
};
Plane Planar_AVX2(const uint8* src)
{
__m128i d0 = _mm_loadu_si128(((__m128i*)src) + 0);
__m128i d1 = _mm_loadu_si128(((__m128i*)src) + 1);
__m128i d2 = _mm_loadu_si128(((__m128i*)src) + 2);
__m128i d3 = _mm_loadu_si128(((__m128i*)src) + 3);
__m128i rgb0 = _mm_shuffle_epi8(d0, _mm_setr_epi8(0, 4, 8, 12, 1, 5, 9, 13, 2, 6, 10, 14, -1, -1, -1, -1));
__m128i rgb1 = _mm_shuffle_epi8(d1, _mm_setr_epi8(0, 4, 8, 12, 1, 5, 9, 13, 2, 6, 10, 14, -1, -1, -1, -1));
__m128i rgb2 = _mm_shuffle_epi8(d2, _mm_setr_epi8(0, 4, 8, 12, 1, 5, 9, 13, 2, 6, 10, 14, -1, -1, -1, -1));
__m128i rgb3 = _mm_shuffle_epi8(d3, _mm_setr_epi8(0, 4, 8, 12, 1, 5, 9, 13, 2, 6, 10, 14, -1, -1, -1, -1));
__m128i rg0 = _mm_unpacklo_epi32(rgb0, rgb1);
__m128i rg1 = _mm_unpacklo_epi32(rgb2, rgb3);
__m128i b0 = _mm_unpackhi_epi32(rgb0, rgb1);
__m128i b1 = _mm_unpackhi_epi32(rgb2, rgb3);
// swap channels
__m128i b8 = _mm_unpacklo_epi64(rg0, rg1);
__m128i g8 = _mm_unpackhi_epi64(rg0, rg1);
__m128i r8 = _mm_unpacklo_epi64(b0, b1);
__m128i t0 = _mm_sad_epu8(r8, _mm_setzero_si128());
__m128i t1 = _mm_sad_epu8(g8, _mm_setzero_si128());
__m128i t2 = _mm_sad_epu8(b8, _mm_setzero_si128());
__m128i r8s = _mm_shuffle_epi8(r8, _mm_set_epi8(0xF, 0xE, 0xB, 0xA, 0x7, 0x6, 0x3, 0x2, 0xD, 0xC, 0x9, 0x8, 0x5, 0x4, 0x1, 0x0));
__m128i g8s = _mm_shuffle_epi8(g8, _mm_set_epi8(0xF, 0xE, 0xB, 0xA, 0x7, 0x6, 0x3, 0x2, 0xD, 0xC, 0x9, 0x8, 0x5, 0x4, 0x1, 0x0));
__m128i b8s = _mm_shuffle_epi8(b8, _mm_set_epi8(0xF, 0xE, 0xB, 0xA, 0x7, 0x6, 0x3, 0x2, 0xD, 0xC, 0x9, 0x8, 0x5, 0x4, 0x1, 0x0));
__m128i s0 = _mm_sad_epu8(r8s, _mm_setzero_si128());
__m128i s1 = _mm_sad_epu8(g8s, _mm_setzero_si128());
__m128i s2 = _mm_sad_epu8(b8s, _mm_setzero_si128());
__m256i sr0 = _mm256_insertf128_si256(_mm256_castsi128_si256(t0), s0, 1);
__m256i sg0 = _mm256_insertf128_si256(_mm256_castsi128_si256(t1), s1, 1);
__m256i sb0 = _mm256_insertf128_si256(_mm256_castsi128_si256(t2), s2, 1);
__m256i sr1 = _mm256_slli_epi64(sr0, 32);
__m256i sg1 = _mm256_slli_epi64(sg0, 16);
__m256i srb = _mm256_or_si256(sr1, sb0);
__m256i srgb = _mm256_or_si256(srb, sg1);
__m128i t3 = _mm_castps_si128(_mm_shuffle_ps(_mm_castsi128_ps(t0), _mm_castsi128_ps(t1), _MM_SHUFFLE(2, 0, 2, 0)));
__m128i t4 = _mm_shuffle_epi32(t2, _MM_SHUFFLE(3, 1, 2, 0));
__m128i t5 = _mm_hadd_epi32(t3, t4);
__m128i t6 = _mm_shuffle_epi32(t5, _MM_SHUFFLE(1, 1, 1, 1));
__m128i t7 = _mm_shuffle_epi32(t5, _MM_SHUFFLE(2, 2, 2, 2));
__m256i sr = _mm256_broadcastw_epi16(t5);
__m256i sg = _mm256_broadcastw_epi16(t6);
__m256i sb = _mm256_broadcastw_epi16(t7);
__m256i r08 = _mm256_cvtepu8_epi16(r8);
__m256i g08 = _mm256_cvtepu8_epi16(g8);
__m256i b08 = _mm256_cvtepu8_epi16(b8);
__m256i r16 = _mm256_slli_epi16(r08, 4);
__m256i g16 = _mm256_slli_epi16(g08, 4);
__m256i b16 = _mm256_slli_epi16(b08, 4);
__m256i difR0 = _mm256_sub_epi16(r16, sr);
__m256i difG0 = _mm256_sub_epi16(g16, sg);
__m256i difB0 = _mm256_sub_epi16(b16, sb);
__m256i difRyz = _mm256_madd_epi16(difR0, _mm256_set_epi16(255, 85, -85, -255, 255, 85, -85, -255, 255, 85, -85, -255, 255, 85, -85, -255));
__m256i difGyz = _mm256_madd_epi16(difG0, _mm256_set_epi16(255, 85, -85, -255, 255, 85, -85, -255, 255, 85, -85, -255, 255, 85, -85, -255));
__m256i difByz = _mm256_madd_epi16(difB0, _mm256_set_epi16(255, 85, -85, -255, 255, 85, -85, -255, 255, 85, -85, -255, 255, 85, -85, -255));
__m256i difRxz = _mm256_madd_epi16(difR0, _mm256_set_epi16(255, 255, 255, 255, 85, 85, 85, 85, -85, -85, -85, -85, -255, -255, -255, -255));
__m256i difGxz = _mm256_madd_epi16(difG0, _mm256_set_epi16(255, 255, 255, 255, 85, 85, 85, 85, -85, -85, -85, -85, -255, -255, -255, -255));
__m256i difBxz = _mm256_madd_epi16(difB0, _mm256_set_epi16(255, 255, 255, 255, 85, 85, 85, 85, -85, -85, -85, -85, -255, -255, -255, -255));
__m256i difRGyz = _mm256_hadd_epi32(difRyz, difGyz);
__m256i difByzxz = _mm256_hadd_epi32(difByz, difBxz);
__m256i difRGxz = _mm256_hadd_epi32(difRxz, difGxz);
__m128i sumRGyz = _mm_add_epi32(_mm256_castsi256_si128(difRGyz), _mm256_extracti128_si256(difRGyz, 1));
__m128i sumByzxz = _mm_add_epi32(_mm256_castsi256_si128(difByzxz), _mm256_extracti128_si256(difByzxz, 1));
__m128i sumRGxz = _mm_add_epi32(_mm256_castsi256_si128(difRGxz), _mm256_extracti128_si256(difRGxz, 1));
__m128i sumRGByz = _mm_hadd_epi32(sumRGyz, sumByzxz);
__m128i sumRGByzxz = _mm_hadd_epi32(sumRGxz, sumByzxz);
__m128i sumRGBxz = _mm_shuffle_epi32(sumRGByzxz, _MM_SHUFFLE(2, 3, 1, 0));
__m128 sumRGByzf = _mm_cvtepi32_ps(sumRGByz);
__m128 sumRGBxzf = _mm_cvtepi32_ps(sumRGBxz);
const float value = (255 * 255 * 8.0f + 85 * 85 * 8.0f) * 16.0f;
__m128 scale = _mm_set1_ps(-4.0f / value);
__m128 af = _mm_mul_ps(sumRGBxzf, scale);
__m128 bf = _mm_mul_ps(sumRGByzf, scale);
__m128 df = _mm_mul_ps(_mm_cvtepi32_ps(t5), _mm_set1_ps(4.0f / 16.0f));
// calculating the three colors RGBO, RGBH, and RGBV. RGB = df - af * x - bf * y;
__m128 cof0 = _mm_fnmadd_ps(af, _mm_set1_ps(-255.0f), _mm_fnmadd_ps(bf, _mm_set1_ps(-255.0f), df));
__m128 chf0 = _mm_fnmadd_ps(af, _mm_set1_ps( 425.0f), _mm_fnmadd_ps(bf, _mm_set1_ps(-255.0f), df));
__m128 cvf0 = _mm_fnmadd_ps(af, _mm_set1_ps(-255.0f), _mm_fnmadd_ps(bf, _mm_set1_ps( 425.0f), df));
// convert to r6g7b6
__m128i cohv = r6g7b6_AVX2(cof0, chf0, cvf0);
uint64 rgbho = _mm_extract_epi64(cohv, 0);
uint32 rgbv0 = _mm_extract_epi32(cohv, 2);
// Error calculation
auto ro0 = (rgbho >> 48) & 0x3F;
auto go0 = (rgbho >> 40) & 0x7F;
auto bo0 = (rgbho >> 32) & 0x3F;
auto ro1 = (ro0 >> 4) | (ro0 << 2);
auto go1 = (go0 >> 6) | (go0 << 1);
auto bo1 = (bo0 >> 4) | (bo0 << 2);
auto ro2 = (ro1 << 2) + 2;
auto go2 = (go1 << 2) + 2;
auto bo2 = (bo1 << 2) + 2;
__m256i ro3 = _mm256_set1_epi16(ro2);
__m256i go3 = _mm256_set1_epi16(go2);
__m256i bo3 = _mm256_set1_epi16(bo2);
auto rh0 = (rgbho >> 16) & 0x3F;
auto gh0 = (rgbho >> 8) & 0x7F;
auto bh0 = (rgbho >> 0) & 0x3F;
auto rh1 = (rh0 >> 4) | (rh0 << 2);
auto gh1 = (gh0 >> 6) | (gh0 << 1);
auto bh1 = (bh0 >> 4) | (bh0 << 2);
auto rh2 = rh1 - ro1;
auto gh2 = gh1 - go1;
auto bh2 = bh1 - bo1;
__m256i rh3 = _mm256_set1_epi16(rh2);
__m256i gh3 = _mm256_set1_epi16(gh2);
__m256i bh3 = _mm256_set1_epi16(bh2);
auto rv0 = (rgbv0 >> 16) & 0x3F;
auto gv0 = (rgbv0 >> 8) & 0x7F;
auto bv0 = (rgbv0 >> 0) & 0x3F;
auto rv1 = (rv0 >> 4) | (rv0 << 2);
auto gv1 = (gv0 >> 6) | (gv0 << 1);
auto bv1 = (bv0 >> 4) | (bv0 << 2);
auto rv2 = rv1 - ro1;
auto gv2 = gv1 - go1;
auto bv2 = bv1 - bo1;
__m256i rv3 = _mm256_set1_epi16(rv2);
__m256i gv3 = _mm256_set1_epi16(gv2);
__m256i bv3 = _mm256_set1_epi16(bv2);
__m256i x = _mm256_set_epi16(3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0);
__m256i rh4 = _mm256_mullo_epi16(rh3, x);
__m256i gh4 = _mm256_mullo_epi16(gh3, x);
__m256i bh4 = _mm256_mullo_epi16(bh3, x);
__m256i y = _mm256_set_epi16(3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0, 3, 2, 1, 0);
__m256i rv4 = _mm256_mullo_epi16(rv3, y);
__m256i gv4 = _mm256_mullo_epi16(gv3, y);
__m256i bv4 = _mm256_mullo_epi16(bv3, y);
__m256i rxy = _mm256_add_epi16(rh4, rv4);
__m256i gxy = _mm256_add_epi16(gh4, gv4);
__m256i bxy = _mm256_add_epi16(bh4, bv4);
__m256i rp0 = _mm256_add_epi16(rxy, ro3);
__m256i gp0 = _mm256_add_epi16(gxy, go3);
__m256i bp0 = _mm256_add_epi16(bxy, bo3);
__m256i rp1 = _mm256_srai_epi16(rp0, 2);
__m256i gp1 = _mm256_srai_epi16(gp0, 2);
__m256i bp1 = _mm256_srai_epi16(bp0, 2);
__m256i rp2 = _mm256_max_epi16(_mm256_min_epi16(rp1, _mm256_set1_epi16(255)), _mm256_setzero_si256());
__m256i gp2 = _mm256_max_epi16(_mm256_min_epi16(gp1, _mm256_set1_epi16(255)), _mm256_setzero_si256());
__m256i bp2 = _mm256_max_epi16(_mm256_min_epi16(bp1, _mm256_set1_epi16(255)), _mm256_setzero_si256());
__m256i rdif = _mm256_sub_epi16(r08, rp2);
__m256i gdif = _mm256_sub_epi16(g08, gp2);
__m256i bdif = _mm256_sub_epi16(b08, bp2);
__m256i rerr = _mm256_mullo_epi16(rdif, _mm256_set1_epi16(38));
__m256i gerr = _mm256_mullo_epi16(gdif, _mm256_set1_epi16(76));
__m256i berr = _mm256_mullo_epi16(bdif, _mm256_set1_epi16(14));
__m256i sum0 = _mm256_add_epi16(rerr, gerr);
__m256i sum1 = _mm256_add_epi16(sum0, berr);
__m256i sum2 = _mm256_madd_epi16(sum1, sum1);
__m128i sum3 = _mm_add_epi32(_mm256_castsi256_si128(sum2), _mm256_extracti128_si256(sum2, 1));
uint32 err0 = _mm_extract_epi32(sum3, 0);
uint32 err1 = _mm_extract_epi32(sum3, 1);
uint32 err2 = _mm_extract_epi32(sum3, 2);
uint32 err3 = _mm_extract_epi32(sum3, 3);
uint64 error = err0 + err1 + err2 + err3;
/**/
uint32 rgbv = _pext_u32(rgbv0, 0x3F7F3F);
uint64 rgbho0 = _pext_u64(rgbho, 0x3F7F3F003F7F3F);
uint32 hi = rgbv | ((rgbho0 & 0x1FFF) << 19);
uint32 lo = _pdep_u32(rgbho0 >> 13, 0x7F7F1BFD);
uint32 idx = _pext_u64(rgbho, 0x20201E00000000);
lo |= _pdep_u32(g_flags_AVX2[idx], 0x8080E402);
uint64 result = static_cast<uint32>(_bswap(lo));
result |= static_cast<uint64>(static_cast<uint32>(_bswap(hi))) << 32;
Plane plane;
plane.plane = result;
plane.error = error;
plane.sum4 = _mm256_permute4x64_epi64(srgb, _MM_SHUFFLE(2, 3, 0, 1));
return plane;
}
uint64 VS_VECTORCALL EncodeSelectors_AVX2( uint64 d, const uint32 terr[2][8], const uint32 tsel[8], const bool rotate, const uint64 value, const uint32 error) noexcept
{
size_t tidx[2];
// Get index of minimum error (terr[0] and terr[1])
__m256i err0 = _mm256_load_si256((const __m256i*)terr[0]);
__m256i err1 = _mm256_load_si256((const __m256i*)terr[1]);
__m256i errLo = _mm256_permute2x128_si256(err0, err1, (0) | (2 << 4));
__m256i errHi = _mm256_permute2x128_si256(err0, err1, (1) | (3 << 4));
__m256i errMin0 = _mm256_min_epu32(errLo, errHi);
__m256i errMin1 = _mm256_shuffle_epi32(errMin0, _MM_SHUFFLE(2, 3, 0, 1));
__m256i errMin2 = _mm256_min_epu32(errMin0, errMin1);
__m256i errMin3 = _mm256_shuffle_epi32(errMin2, _MM_SHUFFLE(1, 0, 3, 2));
__m256i errMin4 = _mm256_min_epu32(errMin3, errMin2);
__m256i errMin5 = _mm256_permute2x128_si256(errMin4, errMin4, (0) | (0 << 4));
__m256i errMin6 = _mm256_permute2x128_si256(errMin4, errMin4, (1) | (1 << 4));
__m256i errMask0 = _mm256_cmpeq_epi32(errMin5, err0);
__m256i errMask1 = _mm256_cmpeq_epi32(errMin6, err1);
uint32 mask0 = _mm256_movemask_epi8(errMask0);
uint32 mask1 = _mm256_movemask_epi8(errMask1);
tidx[0] = _bit_scan_forward(mask0) >> 2;
tidx[1] = _bit_scan_forward(mask1) >> 2;
if ((terr[0][tidx[0]] + terr[1][tidx[1]]) >= error)
{
return value;
}
d |= tidx[0] << 26;
d |= tidx[1] << 29;
uint t0 = tsel[tidx[0]];
uint t1 = tsel[tidx[1]];
if (!rotate)
{
t0 &= 0xFF00FF00;
t1 &= 0x00FF00FF;
}
else
{
t0 &= 0xCCCCCCCC;
t1 &= 0x33333333;
}
// Flip selectors from sign bit
uint t2 = (t0 | t1) ^ 0xFFFF0000;
return d | static_cast<uint64>(_bswap(t2)) << 32;
}
}
uint64 ProcessRGB_AVX2( const uint8* src )
{
uint64 d = CheckSolid_AVX2( src );
if( d != 0 ) return d;
alignas(32) v4i a[8];
__m128i err0 = PrepareAverages_AVX2( a, src );
// Get index of minimum error (err0)
__m128i err1 = _mm_shuffle_epi32(err0, _MM_SHUFFLE(2, 3, 0, 1));
__m128i errMin0 = _mm_min_epu32(err0, err1);
__m128i errMin1 = _mm_shuffle_epi32(errMin0, _MM_SHUFFLE(1, 0, 3, 2));
__m128i errMin2 = _mm_min_epu32(errMin1, errMin0);
__m128i errMask = _mm_cmpeq_epi32(errMin2, err0);
uint32 mask = _mm_movemask_epi8(errMask);
uint32 idx = _bit_scan_forward(mask) >> 2;
d |= EncodeAverages_AVX2( a, idx );
alignas(32) uint32 terr[2][8] = {};
alignas(32) uint32 tsel[8];
if ((idx == 0) || (idx == 2))
{
FindBestFit_4x2_AVX2( terr, tsel, a, idx * 2, src );
}
else
{
FindBestFit_2x4_AVX2( terr, tsel, a, idx * 2, src );
}
return EncodeSelectors_AVX2( d, terr, tsel, (idx % 2) == 1 );
}
uint64 ProcessRGB_4x2_AVX2( const uint8* src )
{
uint64 d = CheckSolid_AVX2( src );
if( d != 0 ) return d;
alignas(32) v4i a[8];
__m128i err0 = PrepareAverages_AVX2( a, src );
uint32 idx = _mm_extract_epi32(err0, 0) < _mm_extract_epi32(err0, 2) ? 0 : 2;
d |= EncodeAverages_AVX2( a, idx );
alignas(32) uint32 terr[2][8] = {};
alignas(32) uint32 tsel[8];
FindBestFit_4x2_AVX2( terr, tsel, a, idx * 2, src );
return EncodeSelectors_AVX2( d, terr, tsel, false);
}
uint64 ProcessRGB_2x4_AVX2( const uint8* src )
{
uint64 d = CheckSolid_AVX2( src );
if( d != 0 ) return d;
alignas(32) v4i a[8];
__m128i err0 = PrepareAverages_AVX2( a, src );
uint32 idx = _mm_extract_epi32(err0, 1) < _mm_extract_epi32(err0, 3) ? 1 : 3;
d |= EncodeAverages_AVX2( a, idx );
alignas(32) uint32 terr[2][8] = {};
alignas(32) uint32 tsel[8];
FindBestFit_2x4_AVX2( terr, tsel, a, idx * 2, src );
return EncodeSelectors_AVX2( d, terr, tsel, true);
}
uint64 ProcessRGB_ETC2_AVX2( const uint8* src )
{
auto plane = Planar_AVX2( src );
alignas(32) v4i a[8];
__m128i err0 = PrepareAverages_AVX2( a, plane.sum4 );
// Get index of minimum error (err0)
__m128i err1 = _mm_shuffle_epi32(err0, _MM_SHUFFLE(2, 3, 0, 1));
__m128i errMin0 = _mm_min_epu32(err0, err1);
__m128i errMin1 = _mm_shuffle_epi32(errMin0, _MM_SHUFFLE(1, 0, 3, 2));
__m128i errMin2 = _mm_min_epu32(errMin1, errMin0);
__m128i errMask = _mm_cmpeq_epi32(errMin2, err0);
uint32 mask = _mm_movemask_epi8(errMask);
size_t idx = _bit_scan_forward(mask) >> 2;
uint64 d = EncodeAverages_AVX2( a, idx );
alignas(32) uint32 terr[2][8] = {};
alignas(32) uint32 tsel[8];
if ((idx == 0) || (idx == 2))
{
FindBestFit_4x2_AVX2( terr, tsel, a, idx * 2, src );
}
else
{
FindBestFit_2x4_AVX2( terr, tsel, a, idx * 2, src );
}
return EncodeSelectors_AVX2( d, terr, tsel, (idx % 2) == 1, plane.plane, plane.error );
}
#ifndef _MSC_VER
# pragma GCC pop_options
#endif
#endif