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Optimize get_cheapest_alternative()

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This commit is contained in:
Pauli Oikkonen 2018-11-30 00:40:40 +02:00
parent 6bbd3e5a44
commit 7fe454c51f
1 changed files with 4 additions and 18 deletions
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22
src/strategies/avx2/quant-avx2.c
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@ -101,28 +101,14 @@ static INLINE void get_cheapest_alternative(__m256i costs_hi, __m256i costs_lo,
__m256i ns, __m256i changes,
int16_t *final_change, int32_t *min_pos)
{
__m128i nslo, nshi, chlo, chhi;
__m256i pllo, plhi; // Payload
__m256i tmp1, tmp2;
nshi = _mm256_extracti128_si256(ns, 1);
nslo = _mm256_extracti128_si256(ns, 0);
chhi = _mm256_extracti128_si256(changes, 1);
chlo = _mm256_extracti128_si256(changes, 0);
// Interleave ns and lo into 32-bit variables and to two 256-bit wide vecs,
// to have the same data layout as in costs. Zero extend to 32b width, shift
// changes 16 bits to the left, and store them into the same vectors.
// TODO: unpack instead of this
tmp1 = _mm256_cvtepu16_epi32(nslo);
tmp2 = _mm256_cvtepu16_epi32(chlo);
tmp2 = _mm256_bslli_epi128(tmp2, 2);
pllo = _mm256_or_si256(tmp1, tmp2);
__m256i tmphi = _mm256_unpackhi_epi16(ns, changes);
__m256i tmplo = _mm256_unpacklo_epi16(ns, changes);
tmp1 = _mm256_cvtepu16_epi32(nshi);
tmp2 = _mm256_cvtepu16_epi32(chhi);
tmp2 = _mm256_bslli_epi128(tmp2, 2);
plhi = _mm256_or_si256(tmp1, tmp2);
__m256i plhi = _mm256_permute2x128_si256(tmplo, tmphi, 0x31);
__m256i pllo = _mm256_permute2x128_si256(tmplo, tmphi, 0x20);
// Reorder to afford result stability (if multiple atoms tie for cheapest,
// rightmost ie. the highest is the wanted one)