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std › hash › cityhash › CityHash64 › hash Public Function hash Doc Source Public Function std.hash.cityhash.CityHash64.hash
pub fn hash (str : []const u8 ) u64 Params File hash/cityhash.zig: 292
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334 pub fn hash (str : []const u8 ) u64 {
if (str .len <= 32 ) {
if (str .len <= 16 ) {
return hashLen0To16 str );
} else {
return hashLen17To32 str );
}
} else if (str .len <= 64 ) {
return hashLen33To64 str );
}
var len : u64 = @as (u64 , str .len );
var x : u64 = fetch64 str .ptr , str .len - 40 );
var y : u64 = fetch64 str .ptr , str .len - 16 ) +% fetch64 str .ptr , str .len - 56 );
var z : u64 = hashLen16 fetch64 str .ptr , str .len - 48 ) +% len , fetch64 str .ptr , str .len - 24 ));
var v : WeakPair weakHashLen32WithSeeds offsetPtr str .ptr , str .len - 64 ), len , z );
var w : WeakPair weakHashLen32WithSeeds offsetPtr str .ptr , str .len - 32 ), y +% k1 x );
x = x *% k1 fetch64 str .ptr , 0 );
len = (len - 1 ) & ~@as (u64 , @intCast (63 ));
var ptr : [*]const u8 = str .ptr ;
while (true ) {
x = rotr64 x +% y +% v .first +% fetch64 ptr , 8 ), 37 ) *% k1 y = rotr64 y +% v .second +% fetch64 ptr , 48 ), 42 ) *% k1 x ^= w .second ;
y +%= v .first +% fetch64 ptr , 40 );
z = rotr64 z +% w .first , 33 ) *% k1 v = weakHashLen32WithSeeds ptr , v .second *% k1 x +% w .first );
w = weakHashLen32WithSeeds offsetPtr ptr , 32 ), z +% w .second , y +% fetch64 ptr , 16 ));
const t : u64 = z ;
z = x ;
x = t ;
ptr = offsetPtr ptr , 64 );
len -= 64 ;
if (len == 0 )
break ;
}
return hashLen16 hashLen16 v .first , w .first ) +% shiftmix y ) *% k1 z , hashLen16 v .second , w .second ) +% x );
}