Benchmark: left shift benchmark

Tests:

6 << 15
6 << 15
6 * 2 ** 15
6 * 2 ** 15

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
6 << 15
6 * 2 ** 15

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36

Browser/OS: Chrome 116 on Windows

View result in a separate tab

Test name	Executions per second
6 << 15	1053693824.0 Ops/sec
6 * 2 ** 15	1064226624.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):

LLMs can make mistakes. Check important info.

I'd be happy to help explain what's being tested in this JavaScript microbenchmark.

**Benchmark Definition**

The benchmark definition is a simple expression written in JavaScript: `6 << 15` or `6 * 2 ** 15`. The first one uses the left shift operator (`<<`), while the second one uses the multiplication and exponentiation operators (`*`, `**`) with parentheses to achieve similar results.

**Comparison of Options**

There are two main approaches being compared:

1. **Left Shift Operator (`<<`)**: This operator shifts the bits of the number 6 to the left by 15 positions, effectively multiplying it by 2^15 (32768). The benefits of this approach include:
	* Simple and straightforward implementation.
	* Fast execution due to bit-level operations.
	* Minimal CPU overhead.
However, this approach also has some drawbacks:
	* May not be as readable or maintainable for more complex expressions.
	* Can lead to overflow issues if the result exceeds the maximum value representable by an integer type.
2. **Multiplication and Exponentiation (`*`, `**`) with Parentheses**: This approach uses parentheses to ensure the correct order of operations, which may prevent unexpected behavior in cases where operator precedence is not clear. The benefits of this approach include:
	* More readable and maintainable code for complex expressions.
	* Can help avoid common mistakes like evaluating exponents before multiplication.
However, this approach also has some drawbacks:
	* May be slower due to the overhead of function calls or more complex arithmetic operations.
	* Requires more CPU resources.

**Library Usage**

There is no library mentioned in the benchmark definition. However, it's worth noting that the use of parentheses in the second expression (`6 * 2 ** 15`) ensures that the exponentiation operation is evaluated first, which may be important for certain mathematical algorithms or libraries.

**Special JavaScript Features/Syntax**

None are explicitly mentioned in this benchmark.

**Alternative Approaches**

Other alternatives to consider when implementing this benchmark include:

* Using bitwise multiplication (`>>>` or `<<`) instead of left shift operator.
* Implementing a custom exponentiation function for the second approach, rather than relying on the built-in exponentiation operator (`**`).
* Using a Just-In-Time (JIT) compiler or ahead-of-time (AOT) compilation to optimize performance.

Keep in mind that these alternatives may not necessarily provide better results or accuracy, and it's essential to consider factors like readability, maintainability, and compatibility when choosing an implementation approach.

Related benchmarks:

left shift benchmark (version: 1)

Comparing performance of: 6 << 15 vs 6 * 2 ** 15

Created: one year ago by: Registered User

Jump to the latest result

6 << 15

6 * 2 ** 15

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):