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Round float
(version: 0)
Comparing performance of:
With Fixed vs Double bitwise not with division
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var time = 1223856000000, result;
Tests:
With Fixed
result = ((Date.now() - time) / 315576000).toFixed(2)
Double bitwise not with division
result = ~~((Date.now() - time) / 315576000) / 100;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
With Fixed
Double bitwise not with division
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to help you understand the benchmark being tested on MeasureThat.net. **Benchmark Overview** The benchmark is designed to measure the performance of JavaScript's floating-point arithmetic operations, specifically the conversion of seconds to days. There are two test cases: 1. **"With Fixed"`**: This test case uses the `toFixed(2)` method to round the result to 2 decimal places. 2. **"Double bitwise not with division"`**: This test case uses a bit-trickery approach, where `~~` (bitwise NOT) is applied to the result of dividing the seconds by the number of days in a year. **Options Compared** The two options being compared are: 1. Using `toFixed(2)` for rounding. 2. Using a bitwise NOT trick (`~~`) followed by division to perform the calculation. **Pros and Cons** 1. **"With Fixed"`**: * Pros: Easy to understand, straightforward approach, and widely supported in JavaScript engines. * Cons: May lead to precision issues due to rounding errors. 2. **"Double bitwise not with division"`**: * Pros: Can provide more accurate results by avoiding rounding errors. * Cons: Less intuitive and harder to understand for some developers, as it relies on a bit-trickery approach. The `~~` operator performs an integer conversion of the number, effectively truncating it. When used in conjunction with division, this trick can help avoid the precision issues associated with floating-point arithmetic. **Library and Special JS Feature** There is no explicit library mentioned in the benchmark definition or test cases. However, JavaScript engines like V8 (used by Chrome) and SpiderMonkey (used by Firefox) have optimized implementations of floating-point arithmetic operations. No special JS feature or syntax is used in this benchmark, as it only involves basic arithmetic operations. **Other Alternatives** If you're looking for alternative approaches to optimize your code, consider the following: 1. **Use high-precision arithmetic libraries**: Libraries like `decimal.js` or `big.js` can provide more accurate results than built-in JavaScript floating-point arithmetic. 2. **Use SIMD instructions**: If your platform supports it, using SIMD (Single Instruction, Multiple Data) instructions can significantly improve performance for certain operations. Keep in mind that the choice of approach depends on your specific use case and requirements. I hope this explanation helps you understand the benchmark being tested on MeasureThat.net!
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