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enh(query): opt decompress perf.

This commit is contained in:
Haojun Liao 2023-01-05 10:13:05 +08:00
parent 44e103a6a9
commit 4fd8954c9c
1 changed files with 55 additions and 0 deletions
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55
source/util/src/tcompression.c
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@ -292,6 +292,60 @@ int32_t tsDecompressINTImp(const char *const input, const int32_t nelements, cha
p[_pos++] = prev_value;
}
} else {
int32_t batch = elems >> 2;
int32_t globalBatch = (nelements - count) >> 2;
int32_t minBatch = TMIN(batch, globalBatch);
#if 1
// manual unrolling, to erase the hotspot
for (int32_t i = 0; i < minBatch; ++i, count += 4) {
zigzag_value = ((w >> (4 + v)) & mask);
int64_t diff = ZIGZAG_DECODE(int64_t, zigzag_value);
prev_value = diff + prev_value;
p[_pos++] = prev_value;
v += bit;
zigzag_value = ((w >> (4 + v)) & mask);
diff = ZIGZAG_DECODE(int64_t, zigzag_value);
prev_value = diff + prev_value;
p[_pos++] = prev_value;
v += bit;
zigzag_value = ((w >> (4 + v)) & mask);
diff = ZIGZAG_DECODE(int64_t, zigzag_value);
prev_value = diff + prev_value;
p[_pos++] = prev_value;
v += bit;
zigzag_value = ((w >> (4 + v)) & mask);
diff = ZIGZAG_DECODE(int64_t, zigzag_value);
prev_value = diff + prev_value;
p[_pos++] = prev_value;
v += bit;
}
// handle the remain
int32_t remain = elems % 4;
int32_t globalRemain = (nelements - count);
int32_t minRemain = TMIN(globalRemain,remain);
for (int32_t i = 0; i < minRemain; i++, count++) {
zigzag_value = ((w >> (4 + v)) & mask);
int64_t diff = ZIGZAG_DECODE(int64_t, zigzag_value);
prev_value = diff + prev_value;
p[_pos++] = prev_value;
v += bit;
}
#else
for (int32_t i = 0; i < elems && count < nelements; i++, count++) {
zigzag_value = ((w >> (4 + v)) & mask);
@ -301,6 +355,7 @@ int32_t tsDecompressINTImp(const char *const input, const int32_t nelements, cha
p[_pos++] = prev_value;
v += bit;
}
#endif
}
} break;
case TSDB_DATA_TYPE_INT: {