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math pow vs bit shifting vs exponentiation operator
(version: 0)
Comparing performance of:
pow vs bit shifting vs exponentiation operator
Created:
3 years ago
by:
Guest
Go to the latest result
Tests:
pow
var x = Math.pow(2,15);
bit shifting
var y = 2 << 15;
exponentiation operator
var z = 2 ** 15
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
pow
bit shifting
exponentiation operator
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
5 months ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36
Browser/OS:
Chrome 145 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=625978" width="100%" height="500px"></iframe>
bit shifting
124.5M/s
exponentiation operator
120.1M/s
pow
116.0M/s
View exact numbers
Test name
Executions per second
✓
bit shifting
124,541,840 Ops/sec
exponentiation operator
120,065,824 Ops/sec
pow
115,990,616 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and its test cases. **Benchmark Overview** The provided benchmark measures the performance of three different ways to calculate `2^15`: 1. Using the `Math.pow()` function 2. Using left bit shifting (`<<`) 3. Using the exponentiation operator (`**`) **Options Compared** The benchmark compares the execution speed of these three approaches on various browsers, devices, and operating systems. Pros and Cons: * **Math.pow()**: This is a built-in JavaScript function that can be slow due to its implementation in C++ for performance reasons. However, it's also widely supported and provides a clear understanding of exponentiation. * **Left Bit Shifting (`<<`)**: This approach is generally faster because it only requires shifting the bits of the number 2 and then adding 15, which is a simple operation. However, it may not be as intuitive or readable as other approaches. * **Exponentiation Operator (`**`)**: This is a modern JavaScript feature introduced in ES6. It's also generally faster than `Math.pow()` because it can take advantage of the CPU's exponentiation instructions. Other Considerations: * The benchmark results are influenced by the device, browser, and operating system being used. * Left bit shifting (`<<`) is more portable across different platforms compared to the other two approaches. * Using the exponentiation operator (`**`)) might not be supported in older JavaScript engines or environments. **Library Used** In this benchmark, no specific libraries are mentioned. However, some browsers may have built-in optimizations that could affect the results. **Special JS Features/Syntax** The exponentiation operator (`**`) is a modern JavaScript feature introduced in ES6. It's widely supported in modern browsers and engines but might not be available or optimized in older environments. **Alternative Approaches** If you need to calculate `2^15` for other purposes, here are some alternative approaches: * Using bit manipulation: `result = (1 << 30) - 1;` * Using bitwise division: `result = Math.floor((1 << 15));` Keep in mind that the choice of approach depends on your specific use case and performance requirements.
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