mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 07:20:11 +00:00
14a50c9d23
Assorted tweaking, twisting and tuning to squeeze a few additional cycles out of the memchr code. Changes include bypassing the shift pairs (sld,srd) when they are not required, and unrolling the small_loop that handles short and trailing strings. Per scrollpipe data measuring aligned strings for 64-bit, these changes save between five and eight cycles (9-13% overall) for short strings (<32), Longer aligned strings see slight improvement of 1-3% due to bypassing the shifts and the instruction rearranging. |
||
---|---|---|
.. | ||
generic | ||
gnu | ||
i386 | ||
ieee754 | ||
mach | ||
posix | ||
powerpc | ||
pthread | ||
s390 | ||
sh | ||
sparc | ||
unix | ||
wordsize-32 | ||
wordsize-64 | ||
x86 | ||
x86_64 |