Hi, couldn't do this earlier, please excuse for being so late.
I played with the test-pgm and modified it a bit. You can find my version here: https://drive.google.com/file/d/0B4h65dJSL95DXzdpaUNGYTQ5cVk/edit?usp=sharing I also modified the definitions in myisampack.h and did some tests with a table with 10 mio records in it (1 GB in size) to see the effect of the modifications. You will find my results at the end of the source-code. At a first look the uintXkorr looks like a waste of time but the modified versions do not have much effect on the whole process. Regards AugustQ On So, 2014-01-26 at 19:28 +0400, Alexey Botchkov wrote: > Thanks for the suggestions, Kristian. > I for some reason didn't notice that __builtin_bswap things. > > Best regards. > HF > > > 23.01.2014 19:51, Kristian Nielsen wrote: > > Kristian Nielsen <[email protected]> writes: > > > >> Do it like this: > >> static inline ulonglong > >> mi_uint6korr(const void *p) > >> { > >> uint32 a= *(uint32 *)p; > >> uint16 b= *(uint16 *)(4+(char *)p); > >> ulonglong v= ((ulonglong)a | ((ulonglong)b << 32)) << 16; > >> asm ("bswapq %0" : "=r" (v) : "0" (v)); > >> return v; > >> } > > Note that GCC also has __builtin_bswap64() (and __builtin_bswap32()). They > > also generate bswap instruction, but would also work on other platforms... > > > > - Kristian. > > > _______________________________________________ > Mailing list: https://launchpad.net/~maria-developers > Post to : [email protected] > Unsubscribe : https://launchpad.net/~maria-developers > More help : https://help.launchpad.net/ListHelp _______________________________________________ Mailing list: https://launchpad.net/~maria-developers Post to : [email protected] Unsubscribe : https://launchpad.net/~maria-developers More help : https://help.launchpad.net/ListHelp
