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Use bitwise or instead of conditional mov #29

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Use bitwise or instead of conditional mov #29

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400457a
Update avx512bitpacking.c
MBkkt Jul 9, 2023
b815678
Update avxbitpacking.c
MBkkt Jul 9, 2023
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4 changes: 2 additions & 2 deletions src/avx512bitpacking.c
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Original file line number Diff line number Diff line change
Expand Up @@ -7,14 +7,14 @@ static uint32_t maxbitas32int(const __m256i accumulator) {
const __m256i _tmp2 = _mm256_or_si256(_mm256_srli_si256(_tmp1, 4), _tmp1);
uint32_t ans1 = _mm256_extract_epi32(_tmp2, 0);
uint32_t ans2 = _mm256_extract_epi32(_tmp2, 4);
uint32_t ans = ans1 > ans2 ? ans1 : ans2;
uint32_t ans = ans1 | ans2;
return ans;
}

static uint32_t avx512maxbitas32int(const __m512i accumulator) {
uint32_t ans1 = maxbitas32int(_mm512_castsi512_si256(accumulator));
uint32_t ans2 = maxbitas32int(_mm512_extracti64x4_epi64(accumulator, 1));
uint32_t ans = ans1 > ans2 ? ans1 : ans2;
uint32_t ans = ans1 | ans2;
return bits(ans);
}

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2 changes: 1 addition & 1 deletion src/avxbitpacking.c
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@ static uint32_t maxbitas32int(const __m256i accumulator) {
const __m256i _tmp2 = _mm256_or_si256(_mm256_srli_si256(_tmp1, 4), _tmp1);
uint32_t ans1 = _mm256_extract_epi32(_tmp2, 0);
uint32_t ans2 = _mm256_extract_epi32(_tmp2, 4);
uint32_t ans = ans1 > ans2 ? ans1 : ans2;
uint32_t ans = ans1 | ans2;
return bits(ans);
}

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