steve
/
factor
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

checksums.murmur: use bits word.

db4
John Benediktsson 2013-11-24 10:45:46 -08:00
parent 46b043c0b8
commit ee294292f6
1 changed files with 6 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
basis/checksums/murmur/murmur.factor
View File

@ -20,16 +20,14 @@ CONSTANT: n 0xe6546b64
<PRIVATE
: 32-bit ( n -- n' ) 32 on-bits mask ; inline
: rotl ( k r -- k' )
[ shift ] [ 32 - shift ] 2bi bitor ; inline
: (hash-chunk) ( k -- k' )
c1 * 32-bit r1 rotl c2 * 32-bit ; inline
c1 * 32 bits r1 rotl c2 * 32 bits ; inline
: hash-chunk ( hash k -- hash' )
(hash-chunk) bitxor r2 rotl m * n + 32-bit ; inline
(hash-chunk) bitxor r2 rotl m * n + 32 bits ; inline
: main-loop ( seq hash -- seq hash' )
over byte-array? little-endian? and [
@ -43,16 +41,16 @@ CONSTANT: n 0xe6546b64
: end-case ( seq hash -- hash' )
swap dup length
[ 4 mod tail-slice* be> (hash-chunk) bitxor ]
[ bitxor ] bi 32-bit ; inline
[ bitxor ] bi 32 bits ; inline
: avalanche ( hash -- hash' )
[ -16 shift ] [ bitxor 0x85ebca6b * 32-bit ] bi
[ -13 shift ] [ bitxor 0xc2b2ae35 * 32-bit ] bi
[ -16 shift ] [ bitxor 0x85ebca6b * 32 bits ] bi
[ -13 shift ] [ bitxor 0xc2b2ae35 * 32 bits ] bi
[ -16 shift ] [ bitxor ] bi ; inline
PRIVATE>
M: murmur3-32 checksum-bytes ( bytes checksum -- value )
seed>> 32-bit main-loop end-case avalanche ;
seed>> 32 bits main-loop end-case avalanche ;
INSTANCE: murmur3-32 checksum