jsPerf.app is an online JavaScript performance benchmark test runner & jsperf.com mirror. It is a complete rewrite in homage to the once excellent jsperf.com now with hopefully a more modern & maintainable codebase.

jsperf.com URLs are mirrored at the same path, e.g:

https://jsperf.com/negative-modulo/2

Can be accessed at:

https://jsperf.app/negative-modulo/2

```
var approx_const_32, approx_const_64, approx_const_quake_32, fastInvSqrt_typed;
approx_const_quake_32 = 0x5f3759df;
approx_const_32 = 0x5f375a86;
approx_const_64 = 0x5fe6eb50c7aa19f9;
fastInvSqrt_typed = function(n, precision) {
var i, iter, y;
if (precision == null) {
precision = 1;
}
y = new Float32Array(1);
i = new Int32Array(y.buffer);
y[0] = n;
i[0] = 0x5f375a86 - (i[0] >> 1);
for (iter = 1; 1 <= precision ? iter < precision : iter > precision; 1 <= precision ? iter++ : iter--) {
y[0] = y[0] * (1.5 - ((n * 0.5) * y[0] * y[0]));
}
return y[0];
};
```

Ready to run.

Test | Ops/sec | |
---|---|---|

Math.sqrt |
| ready |

fast inverse sqrt |
| ready |

You can edit these tests or add more tests to this page by appending /edit to the URL.

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- Revision 2: published on
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- Revision 5: published by Timo on
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