Benchmark: Coordinate test - MeasureThat.net

Script Preparation code:

var width = 480;
var halfWidth = width << 2;

Tests:

Conditional comparison
var xPos = Math.random() * width; var xQuadLeft = xPos < halfWidth ? 0 : 1;
Bitwise comparison
var xPos = Math.random() * width; var diff = xPos ^ halfWidth; diff |= diff >> 1; diff |= diff >> 2; diff |= diff >> 4; diff |= diff >> 8; diff |= diff >> 16; diff &= ~(diff >> 1) | 0x80000000; diff &= (xPos ^ 0x80000000) & (halfWidth ^ 0x7fffffff); var xQuad = !!diff;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Conditional comparison
Bitwise comparison

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

I'll break down the explanation into smaller parts to make it easier to understand.

**Benchmark Definition and Script Preparation Code**

The benchmark definition json contains two main pieces of information:

1. `Name` and `Description`: These are metadata about the benchmark, but in this case, they're empty.
2. `Script Preparation Code` and `Html Preparation Code`: The script preparation code is a JavaScript snippet that sets up the environment for the benchmark. In this case, it declares two variables: `width` (set to 480) and `halfWidth`, which is calculated by shifting the value of `width` to the left by 2 bits using the bitwise shift operator (`<<`). This creates a smaller version of the original width.

**Individual Test Cases**

There are two test cases, each with its own benchmark definition. Let's analyze them:

1. **Conditional Comparison**
The script defines two variables: `xPos` and `xQuadLeft`. The first variable is assigned a random value between 0 and `width` using the modulo operator (`%`). The second variable is then determined based on whether `xPos` is less than `halfWidth`: if it is, `xQuadLeft` is set to 0; otherwise, it's set to 1.

The purpose of this test case seems to be measuring the performance of a conditional comparison operation.

**Bitwise Comparison**
The script defines two variables: `diff` and `xQuad`. The first variable is assigned a value using bitwise operations on the difference between `xPos` and `halfWidth`. The various bitwise operators used here are:

* `^` (bitwise XOR)
* `|=` (bitwise OR assignment)
* `&=` (bitwise AND assignment)
* `~` (bitwise NOT)

The result is then stored in `diff`.

Finally, the value of `diff` is converted to a boolean using the `!!` operator, and this value is assigned to `xQuad`. This seems to be measuring the performance of a bitwise comparison operation.

**Libraries and Special JS Features**

In both test cases, there are no libraries explicitly mentioned or used. However, some advanced JavaScript features are employed:

* Bitwise operations (e.g., `^`, `|=` , etc.) are used in the bitwise comparison test case.
* The `!!` operator is used to convert a value to a boolean.

**Other Considerations**

The benchmark seems to be testing the performance of two different comparison operations: conditional comparison and bitwise comparison. By measuring the number of executions per second for each operation, MeasureThat.net can provide insights into which approach is faster on specific hardware configurations.

**Alternatives**

There are other alternatives to measure JavaScript performance benchmarks:

1. **V8 Benchmark Suite**: A suite of benchmarks developed by Google that tests various aspects of V8 engine performance.
2. **jsperf**: An old benchmarking tool that allowed users to create and share their own benchmarks.
3. **Benchmark.js**: A modern benchmarking library for JavaScript that provides a simpler way to write and run benchmarks.

In conclusion, the provided benchmark measures the performance of two different comparison operations: conditional comparison and bitwise comparison. By analyzing the script preparation code and individual test cases, we can understand what's being tested and how MeasureThat.net achieves this.

Related benchmarks:

Coordinate test (version: 0)

Comparing performance of: Conditional comparison vs Bitwise comparison

Created: 6 years ago by: Guest

Jump to the latest result

Conditional comparison

Bitwise comparison

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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