Benchmark: Math.floor vs right shift

Tests:

Math.floor
Math.floor((Math.random() * 10 + 1) / 2) - 1;
Right shift
(Math.random() * 10 - 1) >> 1

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Math.floor
Right shift

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser/OS: Chrome 128 on Windows

View result in a separate tab

Test name	Executions per second
Math.floor	3761690.0 Ops/sec
Right shift	6857581.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

I'd be happy to explain the provided benchmark.

The test measures the performance of two different approaches: `Math.floor` and right shift (`>>`). The goal is to determine which method is faster for a given input.

**Approach 1: Math.floor**

`Math.floor` is a built-in JavaScript function that returns the largest integer less than or equal to a given number. In this test, it's used with a random value generated using `Math.random()`. The expression `(Math.random() * 10 + 1) / 2 - 1` generates a random integer between -4 and 3.

The pros of using `Math.floor` are:

* It's a widely supported function in most browsers.
* It's easy to understand and implement.
* It provides a clear mathematical result.

However, the cons are:

* For small integers, it may be slower than right shift due to the overhead of the function call.
* It can produce fractional results, which might not be desirable in some cases.

**Approach 2: Right Shift (`>>`)**

Right shift (`>>`) is a bitwise operator that shifts the bits of a number to the right by one position and fills the resulting gap with zeros. In this test, it's used with `Math.random() * 10 - 1`, which generates an integer between -9 and 9.

The pros of using right shift are:

* It's generally faster than `Math.floor` for small integers.
* It provides a bitwise operation, which can be more efficient in some cases.
* It doesn't involve function calls or overhead.

However, the cons are:

* Not all browsers support right shift (`>>`) as a standalone operator. It may require explicit use with an unsigned integer.
* The results might not be immediately clear or intuitive for developers who aren't familiar with bitwise operations.

In this specific benchmark, `Chrome 128` uses `Math.floor`, while the other browser uses right shift (`>>`). However, it's worth noting that the actual performance difference between these approaches may vary depending on the specific use case and requirements.

Other alternatives to consider:

* Using a library or utility function: If you need more complex mathematical operations, you might consider using a library like MathJS or MathUtil. These libraries provide a range of mathematical functions and can offer better performance and accuracy.
* Optimized implementations: Depending on your specific use case, you might be able to optimize the `Math.floor` implementation further by using assembly language or other low-level techniques.

Keep in mind that benchmarking is an art, and results may vary depending on the specific hardware, software, and environment.

Related benchmarks:

Math.floor vs right shift (version: 0)

Comparing performance of: Math.floor vs Right shift

Created: one year ago by: Guest

Jump to the latest result

Math.floor

Right shift

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):