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Right bit shift vs divide by 2
(version: 0)
Comparing performance of:
Right bit shift vs Divide by 2
Created:
one year ago
by:
Guest
Go to the latest result
Tests:
Right bit shift
const x = 64 x >> 1
Divide by 2
const x = 64 x/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 bit shift
Divide by 2
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 months ago
)
User agent:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.0.0 Mobile Safari/537.36
Browser/OS:
Chrome Mobile 148 on Android
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=629411" width="100%" height="500px"></iframe>
Right bit shift
138.4M/s
Divide by 2
134.0M/s
View exact numbers
Test name
Executions per second
✓
Right bit shift
138,350,112 Ops/sec
Divide by 2
133,995,112 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark definition, test cases, and latest results in a way that's easy to understand for software engineers with varying levels of JavaScript knowledge. **Benchmark Definition** The benchmark is called "Right bit shift vs divide by 2". It doesn't have a detailed description. However, it does specify two scripts: 1. `const x = 64 >> 1` 2. `const x = 64 / 2` These scripts are used to compare the performance of right-bit shifting (`>>`) and division by 2. **Right Bit Shift** The right bit shift operation (`x >> 1`) shifts the bits of `x` one position to the right, effectively dividing it by 2. This operation is similar to the integer division operator `/` but is more efficient in terms of CPU cycles. **Division by 2** The division by 2 operation (`x / 2`) performs floating-point division on `x`, which can lead to slightly slower performance compared to bit manipulation operations like right-bit shifting. **Pros and Cons** Here's a brief analysis of the pros and cons of each approach: * **Right Bit Shift** + Pros: - More efficient in terms of CPU cycles - Can be optimized by the CPU for specific architectures + Cons: - May not produce exactly equal results to floating-point division due to rounding errors * **Division by 2 (Floating-Point Division)** + Pros: - Produces exact results, without rounding errors + Cons: - Less efficient in terms of CPU cycles **Library** There are no libraries used explicitly mentioned in the benchmark definition. However, it's essential to note that modern JavaScript engines often rely on optimized implementations of mathematical operations, including bit manipulation and division. **Special JS Feature/Syntax** The provided benchmarks don't use any special JavaScript features or syntax beyond the standard arithmetic operators (`>>`, `/`, etc.). If you were to add more complexity, you might consider using: * ` BigInt` for arbitrary-precision arithmetic * ` BigInt64Array` or ` BigUintArray` for efficient large integer operations * `Atomics` or ` SharedArrayBuffer` for low-level memory management **Other Alternatives** If you wanted to explore alternative approaches for this benchmark, you could consider: 1. **Integer Division**: Instead of using floating-point division (`x / 2`), use integer division (`Math.floor(x / 2)`). 2. **Modulo Operation**: Use the modulo operator (`x % 2`) to achieve a similar result to right-bit shifting. 3. **Bitwise AND and OR**: Combine bitwise operations to implement multiplication, addition, or other arithmetic operations. Keep in mind that each alternative approach would have its own pros and cons, and some might be more suitable for your specific use case than others. When preparing the benchmark, ensure you: * Use a consistent JavaScript engine (e.g., V8) across all test runs. * Run the benchmark on a representative hardware platform to minimize variations. * Repeat the benchmark multiple times to account for any variability in execution frequency. I hope this explanation helps! Let me know if you have further questions.
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