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fix(util): fix decode timestamp error by using avx2.

This commit is contained in:
Haojun Liao 2024-06-19 19:11:52 +08:00
parent f353636136
commit 8d18e7cd9d
1 changed files with 12 additions and 10 deletions
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22
source/util/src/tdecompress.c
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@ -329,6 +329,7 @@ int32_t tsDecompressFloatImplAvx2(const char *const input, const int32_t nelemen
return 0;
}
// decode two timestamps in one loop.
int32_t tsDecompressTimestampAvx2(const char *const input, const int32_t nelements, char *const output,
bool bigEndian) {
int64_t *ostream = (int64_t *)output;
@ -375,13 +376,13 @@ int32_t tsDecompressTimestampAvx2(const char *const input, const int32_t nelemen
__m128i deltaOfDelta = _mm_xor_si128(_mm_srli_epi64(zzVal, 1), signmask);
__m128i deltaCurrent = _mm_add_epi64(deltaOfDelta, prevDelta);
deltaCurrent = _mm_add_epi64(_mm_slli_si128(deltaCurrent, 8), deltaCurrent);
deltaCurrent = _mm_add_epi64(_mm_slli_si128(deltaOfDelta, 8), deltaCurrent);
__m128i val = _mm_add_epi64(deltaCurrent, prevVal);
_mm_storeu_si128((__m128i *)&ostream[opos], val);
__m128i finalVal = _mm_add_epi64(deltaCurrent, prevVal);
_mm_storeu_si128((__m128i *)&ostream[opos], finalVal);
// keep the previous value
prevVal = _mm_shuffle_epi32 (val, 0xEE);
prevVal = _mm_shuffle_epi32 (finalVal, 0xEE);
// keep the previous delta of delta, for the first item
prevDelta = _mm_shuffle_epi32(deltaOfDelta, 0xEE);
@ -428,17 +429,18 @@ int32_t tsDecompressTimestampAvx2(const char *const input, const int32_t nelemen
__m128i deltaOfDelta = _mm_xor_si128(_mm_srli_epi64(zzVal, 1), signmask);
__m128i deltaCurrent = _mm_add_epi64(deltaOfDelta, prevDelta);
deltaCurrent = _mm_add_epi64(_mm_slli_si128(deltaCurrent, 8), deltaCurrent);
deltaCurrent = _mm_add_epi64(_mm_slli_si128(deltaOfDelta, 8), deltaCurrent);
__m128i val = _mm_add_epi64(deltaCurrent, prevVal);
_mm_storeu_si128((__m128i *)&ostream[opos], val);
__m128i finalVal = _mm_add_epi64(deltaCurrent, prevVal);
finalVal = _mm_add_epi64(_mm_slli_si128(deltaCurrent, 8), finalVal);
_mm_storeu_si128((__m128i *)&ostream[opos], finalVal);
// keep the previous value
prevVal = _mm_shuffle_epi32 (val, 0xEE);
prevVal = _mm_shuffle_epi32 (finalVal, 0xEE);
// keep the previous delta of delta
__m128i delta = _mm_add_epi64(_mm_slli_si128(deltaOfDelta, 8), deltaOfDelta);
prevDelta = _mm_shuffle_epi32(_mm_add_epi64(delta, prevDelta), 0xEE);
prevDelta = _mm_shuffle_epi32 (deltaCurrent, 0xEE);
opos += 2;
ipos += nbytes1 + nbytes2;