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Is odd (large float)
(version: 0)
Comparing performance of:
Bitwise vs Modulo
Created:
3 years ago
by:
Guest
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Tests:
Bitwise
const odd = i => !!(~~i & 1); odd(130241.51);
Modulo
const odd = i => i % 2; odd(130241.51);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Bitwise
Modulo
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested, compared, and their pros and cons. **Benchmark Overview** The test measures the performance of two different approaches to determine if a number is odd: 1. **Bitwise**: Using bitwise AND operation (`&`) to check if the least significant bit (LSB) of the number is 1. 2. **Modulo**: Using the modulo operator (`%`) to check if the remainder of the division of the number by 2 is non-zero. **Library and Features** In this benchmark, there are no libraries being used explicitly. However, some features that might be enabled in JavaScript engines could affect the results: * In Chrome 112, `Strict Mode` (activated by prefixing code with `'use strict';`) is enabled. * There's no mention of using any specific JavaScript features like arrow functions, classes, or async/await. **Comparison** The benchmark compares the performance of the two approaches: 1. **Bitwise**: This approach uses a bitwise AND operation to check if the LSB of the number is 1. It's a low-level, CPU-efficient way to perform this operation. 2. **Modulo**: This approach uses the modulo operator to check if the remainder of the division by 2 is non-zero. While it's more readable and concise than the bitwise approach, it might be slower due to the overhead of the modulo operation. **Pros and Cons** * **Bitwise**: + Pros: Fastest ( lowest number of CPU cycles) as it only requires a single bitwise AND operation. + Cons: May require more machine code instructions, making it harder to understand and maintain. * **Modulo**: + Pros: Easier to read and understand than the bitwise approach. + Cons: Might be slower due to the overhead of the modulo operation. **Other Considerations** When choosing between these approaches, consider the trade-off between readability, performance, and maintainability. If performance is critical, the bitwise approach might be a better choice. However, if readability and simplicity are more important, the modulo approach could be a better fit. **Alternatives** If you wanted to test alternative approaches, some options could include: * **Comparing with other languages**: Test similar operations in languages like C or C++ to see how they compare. * **Exploring different JavaScript engines**: Try running this benchmark on Node.js, SpiderMonkey (Firefox), or V8 (other browsers) to see if there are significant differences in performance. * **Optimized implementation**: Write an optimized implementation for one of the approaches, using techniques like SIMD instructions or specialized libraries, and compare its performance with the current benchmarks. Keep in mind that these alternatives would require more extensive modifications to the benchmarking code.
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