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Right shift VS Divide and round
(version: 0)
Comparing performance of:
Right shift vs Divide and round
Created:
4 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var arr = new Array(10000).fill(0).map(() => Math.random() * 10);
Tests:
Right shift
arr.map(n => n >> 1);
Divide and round
arr.map(n => Math.round(n / 2));
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Right shift
Divide and round
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. **Benchmark Definition** The provided benchmark definition json contains two test cases: 1. **Right shift**: The script preparation code creates an array of 10,000 random integers between 0 and 9 (inclusive). The `map` function then applies a right shift operation to each element in the array using the `>>` operator. 2. **Divide and round**: The script preparation code is similar to the previous one, but instead of using a bitwise right shift (`>>`), it uses a division followed by rounding with `Math.round(n / 2)`. **Comparison Options** In this benchmark, two different approaches are compared: 1. **Right Shift (>>>)**: This operation performs an unsigned right shift on the binary representation of each element in the array. 2. **Divide and round**: This approach divides each element by 2 using floating-point arithmetic and then rounds the result to the nearest integer. **Pros and Cons** * **Right Shift**: + Pros: Generally faster than division and rounding due to bitwise operations being optimized at the CPU level. + Cons: May not be suitable for all types of data, especially those that are negative or non-integer values. + Caveats: Some modern CPUs have improved branch prediction for decimal arithmetic, which could affect performance differences between these two approaches. * **Divide and round**: + Pros: Suitable for a wider range of data types, including negative numbers and non-integer values. Also more readable and maintainable code. + Cons: Slower than the right shift operation due to the overhead of floating-point arithmetic. **Library** There is no specific library used in this benchmark definition. However, MeasureThat.net likely uses a JavaScript engine like V8 (used by Google Chrome) or SpiderMonkey (used by Mozilla Firefox) to execute the benchmarks. **Special JS Feature/Syntax** No special features or syntax are mentioned in the provided code examples. The use of `map()` and arrow functions (`=>`) is part of modern JavaScript standards, but there are no other notable features or syntax used in these test cases. **Other Alternatives** If you're looking for alternative approaches to this benchmark, here are a few options: * **Left shift**: Instead of using the right shift operator (`>>`), you could use the left shift operator (`<<`) to achieve the same result. * **Multiplication and subtraction**: Another approach would be to multiply each element by 2 (shifts the decimal point one place to the right) and then subtract it from the original value to effectively divide by 2. This approach would also produce the same results as dividing by 2. Keep in mind that these alternative approaches may have different performance characteristics, so you should consider your specific use case and requirements when choosing an approach. In conclusion, MeasureThat.net provides a great platform for comparing performance differences between various JavaScript operations, like right shift vs. divide and round. By understanding the pros and cons of each approach and considering your specific needs, you can make informed decisions about which operation to use in your own code.
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Right shift VS Divide and floor 2
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