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Performance of MurmurHash3 x86/32 ported to JS.
var MurmurHash3 = {
mul32: function(m, n) {
var nlo = n & 0xffff;
var nhi = n - nlo;
return ((nhi * m | 0) + (nlo * m | 0)) | 0;
},
hashBytes: function(data, len, seed) {
var c1 = 0xcc9e2d51,
c2 = 0x1b873593;
var h1 = seed;
var roundedEnd = len & ~0x3;
for (var i = 0; i < roundedEnd; i += 4) {
var k1 = (data.charCodeAt(i) & 0xff) | ((data.charCodeAt(i + 1) & 0xff) << 8) | ((data.charCodeAt(i + 2) & 0xff) << 16) | ((data.charCodeAt(i + 3) & 0xff) << 24);
k1 = this.mul32(k1, c1);
k1 = ((k1 & 0x1ffff) << 15) | (k1 >>> 17); // ROTL32(k1,15);
k1 = this.mul32(k1, c2);
h1 ^= k1;
h1 = ((h1 & 0x7ffff) << 13) | (h1 >>> 19); // ROTL32(h1,13);
h1 = (h1 * 5 + 0xe6546b64) | 0;
}
k1 = 0;
switch (len % 4) {
case 3:
k1 = (data.charCodeAt(roundedEnd + 2) & 0xff) << 16;
// fallthrough
case 2:
k1 |= (data.charCodeAt(roundedEnd + 1) & 0xff) << 8;
// fallthrough
case 1:
k1 |= (data.charCodeAt(roundedEnd) & 0xff);
k1 = this.mul32(k1, c1);
k1 = ((k1 & 0x1ffff) << 15) | (k1 >>> 17); // ROTL32(k1,15);
k1 = this.mul32(k1, c2);
h1 ^= k1;
}
// finalization
h1 ^= len;
// fmix(h1);
h1 ^= h1 >>> 16;
h1 = this.mul32(h1, 0x85ebca6b);
h1 ^= h1 >>> 13;
h1 = this.mul32(h1, 0xc2b2ae35);
h1 ^= h1 >>> 16;
return h1;
},
hashString: function(data, len, seed) {
var c1 = 0xcc9e2d51,
c2 = 0x1b873593;
var h1 = seed;
var roundedEnd = len & ~0x1;
for (var i = 0; i < roundedEnd; i += 2) {
var k1 = data.charCodeAt(i) | (data.charCodeAt(i + 1) << 16);
k1 = this.mul32(k1, c1);
k1 = ((k1 & 0x1ffff) << 15) | (k1 >>> 17); // ROTL32(k1,15);
k1 = this.mul32(k1, c2);
h1 ^= k1;
h1 = ((h1 & 0x7ffff) << 13) | (h1 >>> 19); // ROTL32(h1,13);
h1 = (h1 * 5 + 0xe6546b64) | 0;
}
if ((len % 2) == 1) {
k1 = data.charCodeAt(roundedEnd);
k1 = this.mul32(k1, c1);
k1 = ((k1 & 0x1ffff) << 15) | (k1 >>> 17); // ROTL32(k1,15);
k1 = this.mul32(k1, c2);
h1 ^= k1;
}
// finalization
h1 ^= (len << 1);
// fmix(h1);
h1 ^= h1 >>> 16;
h1 = this.mul32(h1, 0x85ebca6b);
h1 ^= h1 >>> 13;
h1 = this.mul32(h1, 0xc2b2ae35);
h1 ^= h1 >>> 16;
return h1;
}
};
var i, s10, s1k, s1m = "",
a10 = [], a1k = [];
a10.length = 10;
a1k.length = 1024;
s10 = String.fromCharCode.apply(null, a10.map(function() {
return ((Math.random() * 65536) | 0);
}));
s1k = String.fromCharCode.apply(null, a1k.map(function() {
return ((Math.random() * 65536) | 0);
}));
for (i = 0; i < 1024; i++) s1m = s1m.concat(s1k);
Ready to run.
Test | Ops/sec | |
---|---|---|
1k characters |
| ready |
1k bytes |
| ready |
1m characters |
| ready |
1m bytes |
| ready |
10 characters |
| ready |
10 bytes |
| ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.