Displaying 4 results from an estimated 4 matches for "__builtin_ctzll".
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__builtin_clzll
2019 Feb 20
2
proposal for optimization method
...4_t mask;
if (bits == 64)
mask = -1;
else
{
mask = 1;
mask<<=bits;
mask--;
}
x&=mask;
uint64_t result=1, state=x, ctz=0;
while(state!=1ULL)
{
ctz=__builtin_ctzll(state^1);
result|=1ULL<<ctz;
state+=x<<ctz;
state&=mask;
}
return result;
}
now consider the following steps:
from the 2 constants (d and r) we create 3 constants (with the same bit length):
constants uint32 s,u,mmi;
m...
2012 Jun 23
9
[PATCH 0/5] btrfs: lz4/lz4hc compression
WARNING: This is not compatible with the previous lz4 patchset. If you''re using
experimental compression that isn''t in mainline kernels, be prepared to backup
and restore or decompress before upgrading, and have backups in case it eats
data (which appears not to be a problem any more, but has been during
development).
These patches add lz4 and lz4hc compression
2013 Sep 23
28
[PATCH 0/2] add LZ4 kernel decompression support
Linux 3.11 added respective support, so I think we should follow
suit.
1: xen: add LZ4 decompression support
2: libxc: add LZ4 decompression support
Signed-off-by: Jan Beulich <jbeulich@suse.com>
2012 Feb 13
10
[RFB] add LZ4 compression method to btrfs
Hi,
so here it is, LZ4 compression method inside btrfs. The patchset is based on
top of current Chris'' for-linus + Andi''s snappy implementation + the fixes from
Li Zefan. Passes xfstests and stresstests.
I haven''t measured performance on wide range of hardware or workloads, rather
wanted to publish the patches before I get distracted again. I''d like to ask