database/mariadb-columnstore-engine
1
0
Fork 0
mirror of https://github.com/mariadb-corporation/mariadb-columnstore-engine.git synced 2025-07-29 08:21:15 +03:00
Code Activity

MCOL-4313 Very fragile but high speed approach with inline ASM

Browse Source 
GCC compiler uses aligned versions of SIMD instructions expecting
aligned memory blocks that is hard to implement now
This commit is contained in:
Roman Nozdrin
2020-10-13 12:43:16 +00:00
parent 7d3d828790
commit 844472d812
4 changed files with 65 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
utils/messageqcpp/bytestream.cpp
View File

@ -240,7 +240,12 @@ ByteStream& ByteStream::operator<<(const uint128_t& o)
if (fBuf == 0 || (fCurInPtr - fBuf + 16U > fMaxLen + ISSOverhead))
growBuf(fMaxLen + BlockSize);
*((uint128_t*) fCurInPtr) = o;
__asm__ volatile("movups %1,%0;"
:"=m" ( *fCurInPtr ) // output
:"v"( o ) // input
: "memory" // clobbered
);
fCurInPtr += 16;
return *this;
@ -251,7 +256,11 @@ ByteStream& ByteStream::operator<<(const int128_t& o)
if (fBuf == 0 || (fCurInPtr - fBuf + 16U > fMaxLen + ISSOverhead))
growBuf(fMaxLen + BlockSize);
*((int128_t*) fCurInPtr) = o;
__asm__ volatile("movups %1,%0;"
:"=m" ( *fCurInPtr ) // output
:"v"( o ) // input
: "memory" // clobbered
);
fCurInPtr += 16;
return *this;
@ -441,7 +450,16 @@ void ByteStream::peek(uint128_t& o) const
if (length() < 16)
throw underflow_error("ByteStream>uint128_t: not enough data in stream to fill datatype");
o = *((uint128_t*) fCurOutPtr);
__asm__ volatile("movdqu %0,%%xmm0;"
:
:"m"( *fCurOutPtr ) // input
:"xmm0" // clobbered
);
__asm__ volatile("movups %%xmm0,%0;"
: "=m" (o)// output
: // input
: "memory", "xmm0" // clobbered
);
}
void ByteStream::peek(int128_t& o) const
@ -450,7 +468,16 @@ void ByteStream::peek(int128_t& o) const
if (length() < 16)
throw underflow_error("ByteStream>int128_t: not enough data in stream to fill datatype");
o = *((int128_t*) fCurOutPtr);
__asm__ volatile("movdqu %0,%%xmm0;"
:
:"m"( *fCurOutPtr ) // input
:"xmm0" // clobbered
);
__asm__ volatile("movups %%xmm0,%0;"
: "=m" (o)// output
: // input
: "memory", "xmm0" // clobbered
);
}
void ByteStream::peek(string& s) const