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dbms: probably faster (needs testing) [#METR-2944].

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This commit is contained in:
Alexey Milovidov 2015-07-14 00:28:19 +03:00
parent 234367b038
commit 3072d69739
1 changed files with 21 additions and 4 deletions
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25
dbms/include/DB/Core/StringRef.h
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@ -43,14 +43,31 @@ inline bool compareSSE2(const char * p1, const char * p2)
_mm_loadu_si128(reinterpret_cast<const __m128i *>(p2))));
}
inline bool compareSSE2x4(const char * p1, const char * p2)
{
return 0xFFFF == _mm_movemask_epi8(
_mm_and_si128(
_mm_and_si128(
_mm_cmpeq_epi8(
_mm_loadu_si128(reinterpret_cast<const __m128i *>(p1)),
_mm_loadu_si128(reinterpret_cast<const __m128i *>(p2))),
_mm_cmpeq_epi8(
_mm_loadu_si128(reinterpret_cast<const __m128i *>(p1) + 1),
_mm_loadu_si128(reinterpret_cast<const __m128i *>(p2) + 1))),
_mm_and_si128(
_mm_cmpeq_epi8(
_mm_loadu_si128(reinterpret_cast<const __m128i *>(p1) + 2),
_mm_loadu_si128(reinterpret_cast<const __m128i *>(p2) + 2)),
_mm_cmpeq_epi8(
_mm_loadu_si128(reinterpret_cast<const __m128i *>(p1) + 3),
_mm_loadu_si128(reinterpret_cast<const __m128i *>(p2) + 3)))));
}
inline bool memequalSSE2Wide(const char * p1, const char * p2, size_t size)
{
while (size >= 64)
{
if ( compareSSE2(p1, p2)
&& compareSSE2(p1 + 16, p2 + 16)
&& compareSSE2(p1 + 32, p2 + 32)
&& compareSSE2(p1 + 48, p2 + 48))
if (compareSSE2x4(p1, p2))
{
p1 += 64;
p2 += 64;