Benchmark: branchornobranch

Script Preparation code:

var global;

Tests:

branchless
var a = Math.random(); var b = Math.random(); global = (a > b) * a + (a <= b) * b;
branch
var a = Math.random(); var b = Math.random(); if(a > b) { global = a; } else { global = b; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
branchless
branch

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 benchmark and explain what's being tested.

**Benchmark Definition:**

The benchmark definition is a JSON object that contains metadata about the test case. It includes:

* `Name`: The name of the benchmark, which is "branchornobranch".
* `Description`: A brief description of the test case, which is "branchhhhhh". (This doesn't provide much useful information, but it's present for completeness.)
* `Script Preparation Code`: A JavaScript code snippet that is executed before running the actual test. In this case, it sets a global variable named `global` to an empty value using `var global;`. This suggests that the benchmark is testing the performance of different ways to assign values to a variable without using an explicit conditional statement.
* `Html Preparation Code`: An optional code snippet that can be used to prepare any HTML-related resources. In this case, it's null, which means no HTML preparation is required.

**Individual Test Cases:**

The benchmark contains two test cases:

1. **Branchless**: This test case uses a JavaScript expression with parentheses to evaluate the condition `(a > b) * a + (a <= b) * b`, where `a` and `b` are generated using `Math.random()`. The result is assigned to the global variable `global`.
2. **Branch**: This test case uses an if-else statement with an explicit conditional check `if(a > b) { ... } else { ... }` to determine which value to assign to the global variable `global`.

**Performance Comparison:**

The benchmark is comparing the performance of two approaches:

1. **Branchless**: This approach uses a single expression with parentheses to evaluate the condition and assign the result to the global variable.
2. **Branch**: This approach uses an if-else statement with explicit conditional checks to determine which value to assign to the global variable.

**Pros and Cons:**

* **Branchless**:
	+ Pros:
		- Possibly faster execution due to fewer instructions.
		- Less chance of branch prediction errors (since it's a single, simple expression).
	+ Cons:
		- May not be as readable or maintainable for complex conditions.
		- Requires careful consideration of the condition and its evaluation order.
* **Branch**:
	+ Pros:
		- More explicit and readable for complex conditions.
		- Allows for more control over the flow of execution.
	+ Cons:
		- May be slower due to branch prediction errors or misprediction penalties.
		- Can be more challenging to optimize or predict the performance.

**Special JS Features/Syntax:**

The benchmark doesn't explicitly use any special JavaScript features or syntax, such as async/await, promises, or modern language features like `const` and `let`. However, it does rely on the implicit behavior of the global variable assignment in both test cases.

**Other Alternatives:**

If you were to modify this benchmark or write a new one, you could consider other approaches, such as:

* Using a different data structure or algorithm that avoids branch prediction errors.
* Incorporating more realistic inputs or edge cases to better simulate real-world scenarios.
* Adding additional metrics or analysis to provide more insights into the performance characteristics of each approach.

Keep in mind that benchmarking is an art, and the choice of test case and approach will depend on your specific goals and requirements.

Related benchmarks:

branchornobranch (version: 0)

branchhhhhh

Comparing performance of: branchless vs branch

Created: 4 years ago by: Guest

Jump to the latest result

branchless

branch

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):