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Separate sign3_diff_epu8 from calc_eo_cat

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Just to keep things simple, clear and obvious
This commit is contained in:
Pauli Oikkonen 2019-08-06 18:57:03 +03:00
parent 17947b79ee
commit 2852baa673
1 changed files with 19 additions and 15 deletions
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34
src/strategies/avx2/sao-avx2.c
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@ -53,32 +53,36 @@ static int32_t hsum_8x32b(const __m256i v)
return sum9;
}
// Do the SIGN3 operation for the difference a-b
static INLINE __m256i sign3_diff_epu8(const __m256i a, const __m256i b)
{
// Subtract 0x80 from unsigneds to compare them as signed
const __m256i epu2epi = _mm256_set1_epi8 (0x80);
const __m256i ones = _mm256_set1_epi8 (0x01);
__m256i a_signed = _mm256_sub_epi8 (a, epu2epi);
__m256i b_signed = _mm256_sub_epi8 (b, epu2epi);
__m256i diff = _mm256_subs_epi8 (a_signed, b_signed);
return _mm256_sign_epi8 (ones, diff);
}
// Mapping of edge_idx values to eo-classes, 32x8b at once
static __m256i calc_eo_cat(const __m256i a,
const __m256i b,
const __m256i c)
{
// Subtract 0x80 from unsigneds to use the signed compare on them
const __m256i epu2epi = _mm256_set1_epi8 (0x80);
const __m256i ones = _mm256_set1_epi8 (0x01);
const __m256i twos = _mm256_set1_epi8 (0x02);
const __m256i idx_to_cat = _mm256_setr_epi64x(0x0403000201, 0,
0x0403000201, 0);
__m256i a_signed = _mm256_sub_epi8 (a, epu2epi);
__m256i b_signed = _mm256_sub_epi8 (b, epu2epi);
__m256i c_signed = _mm256_sub_epi8 (c, epu2epi);
__m256i c_a_sign = sign3_diff_epu8 (c, a);
__m256i c_b_sign = sign3_diff_epu8 (c, b);
__m256i c_minus_a = _mm256_subs_epi8 (c_signed, a_signed);
__m256i c_minus_b = _mm256_subs_epi8 (c_signed, b_signed);
__m256i signsum = _mm256_add_epi8 (c_a_sign, c_b_sign);
__m256i eo_idx = _mm256_add_epi8 (signsum, twos);
__m256i c_a_sign = _mm256_sign_epi8 (ones, c_minus_a);
__m256i c_b_sign = _mm256_sign_epi8 (ones, c_minus_b);
__m256i signsum = _mm256_add_epi8 (c_a_sign, c_b_sign);
__m256i eo_idx = _mm256_add_epi8 (signsum, twos);
return _mm256_shuffle_epi8(idx_to_cat, eo_idx);
return _mm256_shuffle_epi8(idx_to_cat, eo_idx);
}
static INLINE __m256i srli_epi8(const __m256i v,