redis

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Commit Graph

Author	SHA1	Message	Date
antirez	c19bfe9fcf	BITCOUNT performance improved. At Redis's default optimization level the command is now much faster, always using a constant-time bit manipualtion technique to count bits instead of GCC builtin popcount, and unrolling the loop. The current implementation performance is 1.5GB/s in a MBA 11" (1.8 Ghz i7) compiled with both GCC and clang. The algorithm used is described here: http://graphics.stanford.edu/~seander/bithacks.html	2012-05-24 15:25:06 +02:00
antirez	e53a1fdd60	bitop.c renamed bitops.c bitop.c contains the "Bit related string operations" so it seems more logical to call it bitops instead of bitop. This also makes it matching the name of the test (unit/bitops.tcl).	2012-05-24 15:24:57 +02:00

Author

SHA1

Message

Date

antirez

c19bfe9fcf

BITCOUNT performance improved.

At Redis's default optimization level the command is now much faster,
always using a constant-time bit manipualtion technique to count bits
instead of GCC builtin popcount, and unrolling the loop.

The current implementation performance is 1.5GB/s in a MBA 11" (1.8 Ghz
i7) compiled with both GCC and clang.

The algorithm used is described here:

http://graphics.stanford.edu/~seander/bithacks.html

2012-05-24 15:25:06 +02:00

antirez

e53a1fdd60

bitop.c renamed bitops.c

bitop.c contains the "Bit related string operations" so it seems more
logical to call it bitops instead of bitop.
This also makes it matching the name of the test (unit/bitops.tcl).

2012-05-24 15:24:57 +02:00

2 Commits