void FLAC__precompute_partition_info_sums_intrin_avx2(const FLAC__int32 residual[], FLAC__uint64 abs_residual_partition_sums[],
uint32_t residual_samples, uint32_t predictor_order, uint32_t min_partition_order, uint32_t max_partition_order, uint32_t bps)
{
const uint32_t default_partition_samples = (residual_samples + predictor_order) >> max_partition_order;
uint32_t partitions = 1u << max_partition_order;
FLAC__ASSERT(default_partition_samples > predictor_order);
/* first do max_partition_order */
{
const uint32_t threshold = 32 - FLAC__bitmath_ilog2(default_partition_samples);
uint32_t partition, residual_sample, end = (uint32_t)(-(int32_t)predictor_order);
if(bps + FLAC__MAX_EXTRA_RESIDUAL_BPS < threshold) {
for(partition = residual_sample = 0; partition < partitions; partition++) {
__m256i sum256 = _mm256_setzero_si256();
__m128i sum128;
end += default_partition_samples;
for( ; (int)residual_sample < (int)end-7; residual_sample+=8) {
__m256i res256 = _mm256_abs_epi32(_mm256_loadu_si256((const __m256i*)(residual+residual_sample)));
sum256 = _mm256_add_epi32(sum256, res256);
}
sum128 = _mm_add_epi32(_mm256_extracti128_si256(sum256, 1), _mm256_castsi256_si128(sum256));
for( ; (int)residual_sample < (int)end-3; residual_sample+=4) {
__m128i res128 = _mm_abs_epi32(_mm_loadu_si128((const __m128i*)(residual+residual_sample)));
sum128 = _mm_add_epi32(sum128, res128);
}
for( ; residual_sample < end; residual_sample++) {
__m128i res128 = _mm_abs_epi32(_mm_cvtsi32_si128(residual[residual_sample]));
sum128 = _mm_add_epi32(sum128, res128);
}
sum128 = _mm_add_epi32(sum128, _mm_shuffle_epi32(sum128, _MM_SHUFFLE(1,0,3,2)));
sum128 = _mm_add_epi32(sum128, _mm_shufflelo_epi16(sum128, _MM_SHUFFLE(1,0,3,2)));
abs_residual_partition_sums[partition] = (FLAC__uint32)_mm_cvtsi128_si32(sum128);
/* workaround for MSVC bugs (at least versions 2015 and 2017 are affected) */
#if (defined _MSC_VER) && (defined FLAC__CPU_X86_64)
abs_residual_partition_sums[partition] &= 0xFFFFFFFF; /**/
#endif
}
}
else { /* have to pessimistically use 64 bits for accumulator */
for(partition = residual_sample = 0; partition < partitions; partition++) {
__m256i sum256 = _mm256_setzero_si256();
__m128i sum128;
end += default_partition_samples;
for( ; (int)residual_sample < (int)end-3; residual_sample+=4) {
__m128i res128 = _mm_abs_epi32(_mm_loadu_si128((const __m128i*)(residual+residual_sample)));
__m256i res256 = _mm256_cvtepu32_epi64(res128);
sum256 = _mm256_add_epi64(sum256, res256);
}
sum128 = _mm_add_epi64(_mm256_extracti128_si256(sum256, 1), _mm256_castsi256_si128(sum256));
for( ; (int)residual_sample < (int)end-1; residual_sample+=2) {
__m128i res128 = _mm_abs_epi32(_mm_loadl_epi64((const __m128i*)(residual+residual_sample)));
res128 = _mm_cvtepu32_epi64(res128);
sum128 = _mm_add_epi64(sum128, res128);
}
for( ; residual_sample < end; residual_sample++) {
__m128i res128 = _mm_abs_epi32(_mm_cvtsi32_si128(residual[residual_sample]));
sum128 = _mm_add_epi64(sum128, res128);
}
sum128 = _mm_add_epi64(sum128, _mm_srli_si128(sum128, 8));
_mm_storel_epi64((__m128i*)(abs_residual_partition_sums+partition), sum128);
}
}
}
/* now merge partitions for lower orders */
{
uint32_t from_partition = 0, to_partition = partitions;
int partition_order;
for(partition_order = (int)max_partition_order - 1; partition_order >= (int)min_partition_order; partition_order--) {
uint32_t i;
partitions >>= 1;
for(i = 0; i < partitions; i++) {
abs_residual_partition_sums[to_partition++] =
abs_residual_partition_sums[from_partition ] +
abs_residual_partition_sums[from_partition+1];
from_partition += 2;
}
}
}
_mm256_zeroupper();
}
__m128i test_mm_cvtepu32_epi64(__m128i a) {
// CHECK-LABEL: test_mm_cvtepu32_epi64
// CHECK: shufflevector <4 x i32> {{.*}}, <4 x i32> {{.*}}, <2 x i32> <i32 0, i32 1>
// CHECK: zext <2 x i32> {{.*}} to <2 x i64>
return _mm_cvtepu32_epi64(a);
}
__m128i test_mm_cvtepu32_epi64(__m128i a) {
// CHECK-LABEL: test_mm_cvtepu32_epi64
// CHECK: call <2 x i64> @llvm.x86.sse41.pmovzxdq(<4 x i32> {{.*}})
// CHECK-ASM: pmovzxdq %xmm{{.*}}, %xmm{{.*}}
return _mm_cvtepu32_epi64(a);
}
void FLAC__precompute_partition_info_sums_intrin_avx2(const FLAC__int32 residual[], FLAC__uint64 abs_residual_partition_sums[],
uint32_t residual_samples, uint32_t predictor_order, uint32_t min_partition_order, uint32_t max_partition_order, uint32_t bps)
{
const uint32_t default_partition_samples = (residual_samples + predictor_order) >> max_partition_order;
uint32_t partitions = 1u << max_partition_order;
FLAC__ASSERT(default_partition_samples > predictor_order);
/* first do max_partition_order */
{
const uint32_t threshold = 32 - FLAC__bitmath_ilog2(default_partition_samples);
uint32_t partition, residual_sample, end = (uint32_t)(-(int32_t)predictor_order);
if(bps + FLAC__MAX_EXTRA_RESIDUAL_BPS < threshold) {
for(partition = residual_sample = 0; partition < partitions; partition++) {
__m256i sum256 = _mm256_setzero_si256();
__m128i sum128;
end += default_partition_samples;
for( ; (int)residual_sample < (int)end-7; residual_sample+=8) {
__m256i res256 = _mm256_abs_epi32(_mm256_loadu_si256((const __m256i*)(residual+residual_sample)));
sum256 = _mm256_add_epi32(sum256, res256);
}
sum128 = _mm_add_epi32(_mm256_extracti128_si256(sum256, 1), _mm256_castsi256_si128(sum256));
for( ; (int)residual_sample < (int)end-3; residual_sample+=4) {
__m128i res128 = _mm_abs_epi32(_mm_loadu_si128((const __m128i*)(residual+residual_sample)));
sum128 = _mm_add_epi32(sum128, res128);
}
for( ; residual_sample < end; residual_sample++) {
__m128i res128 = _mm_abs_epi32(_mm_cvtsi32_si128(residual[residual_sample]));
sum128 = _mm_add_epi32(sum128, res128);
}
sum128 = _mm_hadd_epi32(sum128, sum128);
sum128 = _mm_hadd_epi32(sum128, sum128);
abs_residual_partition_sums[partition] = (FLAC__uint32)_mm_cvtsi128_si32(sum128);
/* workaround for a bug in MSVC2015U2 - see https://connect.microsoft.com/VisualStudio/feedback/details/2659191/incorrect-code-generation-for-x86-64 */
#if (defined _MSC_VER) && (_MSC_FULL_VER == 190023918) && (defined FLAC__CPU_X86_64)
abs_residual_partition_sums[partition] &= 0xFFFFFFFF; /**/
#endif
}
}
else { /* have to pessimistically use 64 bits for accumulator */
for(partition = residual_sample = 0; partition < partitions; partition++) {
__m256i sum256 = _mm256_setzero_si256();
__m128i sum128;
end += default_partition_samples;
for( ; (int)residual_sample < (int)end-3; residual_sample+=4) {
__m128i res128 = _mm_abs_epi32(_mm_loadu_si128((const __m128i*)(residual+residual_sample)));
__m256i res256 = _mm256_cvtepu32_epi64(res128);
sum256 = _mm256_add_epi64(sum256, res256);
}
sum128 = _mm_add_epi64(_mm256_extracti128_si256(sum256, 1), _mm256_castsi256_si128(sum256));
for( ; (int)residual_sample < (int)end-1; residual_sample+=2) {
__m128i res128 = _mm_abs_epi32(_mm_loadl_epi64((const __m128i*)(residual+residual_sample)));
res128 = _mm_cvtepu32_epi64(res128);
sum128 = _mm_add_epi64(sum128, res128);
}
for( ; residual_sample < end; residual_sample++) {
__m128i res128 = _mm_abs_epi32(_mm_cvtsi32_si128(residual[residual_sample]));
sum128 = _mm_add_epi64(sum128, res128);
}
sum128 = _mm_add_epi64(sum128, _mm_srli_si128(sum128, 8));
_mm_storel_epi64((__m128i*)(abs_residual_partition_sums+partition), sum128);
}
}
}
/* now merge partitions for lower orders */
{
uint32_t from_partition = 0, to_partition = partitions;
int partition_order;
for(partition_order = (int)max_partition_order - 1; partition_order >= (int)min_partition_order; partition_order--) {
uint32_t i;
partitions >>= 1;
for(i = 0; i < partitions; i++) {
abs_residual_partition_sums[to_partition++] =
abs_residual_partition_sums[from_partition ] +
abs_residual_partition_sums[from_partition+1];
from_partition += 2;
}
}
}
_mm256_zeroupper();
}
