Source
pub fn hashWithSeed(str: []const u8, seed: u64) u64 {
const m: u64 = 0xc6a4a7935bd1e995;
var h1: u64 = seed ^ (@as(u64, str.len) *% m);
for (@as([*]align(1) const u64, @ptrCast(str.ptr))[0 .. str.len / 8]) |v| {
var k1: u64 = v;
if (native_endian == .big)
k1 = @byteSwap(k1);
k1 *%= m;
k1 ^= k1 >> 47;
k1 *%= m;
h1 ^= k1;
h1 *%= m;
}
const rest = str.len & 7;
const offset = str.len - rest;
if (rest > 0) {
var k1: u64 = 0;
@memcpy(@as([*]u8, @ptrCast(&k1))[0..rest], str[offset..]);
if (native_endian == .big)
k1 = @byteSwap(k1);
h1 ^= k1;
h1 *%= m;
}
h1 ^= h1 >> 47;
h1 *%= m;
h1 ^= h1 >> 47;
return h1;
}