Benchmark: branchless math max (refactor) with zero

HTML Preparation code:

var max = Math

Script Preparation code:

var max = Math.max;
var yOffset = Math.random();
setInterval(() => (yOffset = Math.random()));

Tests:

branchless
return (0 > -yOffset) * -yOffset;
math.max
return max(0, -yOffset);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
branchless
math.max

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases to understand what is being tested.

**Benchmark Definition:**

The benchmark definition is a simple JavaScript expression that calculates whether `yOffset` is greater than 0, or not. There are two versions of this expression:

1. "return (0 > -yOffset) * -yOffset;"
2. "return max(0, -yOffset);"

**Purpose:**

The purpose of these benchmarks is to compare the performance of two different approaches to perform a simple mathematical operation on `yOffset`.

**Options Compared:**

Two options are compared:

1. **Branchless**: This option uses bitwise operations (shift and comparison) to achieve the same result without using an explicit conditional branch.
2. **math.max**: This option uses the built-in `Math.max` function to perform the calculation.

**Pros and Cons of Each Approach:**

**Branchless:**

Pros:

* Can potentially be faster due to reduced branching overhead
* Can be optimized by compiler or JavaScript engine

Cons:

* Requires careful use of bitwise operations to achieve the desired result
* May not be immediately clear to developers who are not familiar with these operations

**math.max:**

Pros:

* Easy to understand and write for most developers
* Reduces cognitive load, as the operation is explicit and obvious

Cons:

* May incur branching overhead due to function call
* Requires a function call, which can be slower than a simple arithmetic operation

**Other Considerations:**

* **Library:** The benchmark uses the `Math` library, which provides various mathematical functions. In this case, it's used for the `max` function.
* **Special JavaScript Feature/Syntax:** None mentioned in this example.

**Alternatives:**

Other alternatives could include:

* Using a custom implementation of the `max` function
* Using assembly language or native code to perform the calculation (not practical for most use cases)
* Using different optimization techniques, such as loop unrolling or vectorization

Overall, these benchmarks aim to compare the performance of two approaches to simple mathematical operations in JavaScript. The branchless approach requires careful tuning and expertise in bitwise operations, while `math.max` is a more straightforward but potentially slower option.

**Benchmark Preparation Code:**

The script preparation code sets up the `max` variable by referencing it from a different scope, which may be done for testing purposes or to ensure that the `Math` library is imported correctly. The HTML preparation code simply references the `max` variable directly in the DOM.

**Individual Test Cases:**

Each test case runs a single benchmark definition (either branchless or math.max) and measures its performance using a specific version of the browser.

The latest benchmark result shows that `math.max` performs slightly better than the branchless approach, but both are relatively fast due to the simplicity of the calculation.

Related benchmarks:

branchless math max (refactor) with zero (version: 0)

Comparing performance of: branchless vs math.max

Created: 4 years ago by: Guest

Jump to the latest result

branchless

math.max

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):