Benchmark: branchfuncofbranchlessmapfuncforkfork

Script Preparation code:

var branchlessMap = [function(){global = "error"}, function(){global = thing - 100 ^ thing}, function() {global = thing ** 100}];
var global;
var thing = 50;

Tests:

branch
thing *= 2; if(thing > 100) { global = thing - 100 ^ thing; } else { global = "error"; } if(thing < 100) { global = thing ** 100; } else { global = "error"; }
branchless map
thing *= 2; branchlessMap[(thing > 100) * 1](); branchlessMap[(thing < 100) * 2]();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
branch
branchless map

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 and its test cases.

**Benchmark Overview**

MeasureThat.net is a platform for creating and running JavaScript microbenchmarks. The website uses JSON data to define benchmarks, which can be executed on various browsers and devices.

**Benchmark Definition JSON**

The provided benchmark definition JSON contains two main sections:

1. **Script Preparation Code**: This section defines the JavaScript code that will be used during the test case execution. It includes a custom function `branchlessMap` with three anonymous functions that manipulate the global variable `global`. The purpose of these functions is unclear, but they seem to demonstrate conditional statements and arithmetic operations.
2. **Html Preparation Code**: This section is empty in the provided example, which means no HTML code is required for the benchmark.

**Individual Test Cases**

There are two test cases defined:

1. **branch**
This test case executes a simple JavaScript statement that performs an assignment operation (`thing *= 2;`) followed by conditional statements (`if (thing > 100) { ... } else { ... }`). The test case also checks the value of `thing` to determine which branch of the conditional statement to execute.
2. **branchless map**
This test case uses the custom function `branchlessMap` defined in the script preparation code to execute two functions. The first function is executed when `thing > 100`, and the second function is executed when `thing < 100`. These functions seem to manipulate the global variable `global`.

**Library: branchlessMap**

The `branchlessMap` function appears to be a custom implementation that allows for conditional execution of code without using traditional if-else statements. The purpose of this library is unclear, but it might be used to optimize performance by avoiding unnecessary computations or branching.

**Special JS Feature/ Syntax**

There is no special JavaScript feature or syntax mentioned in the provided benchmark definition JSON. However, the use of a custom function `branchlessMap` implies that some creative coding techniques are being employed.

**Alternatives and Considerations**

When it comes to optimizing conditional statements and arithmetic operations, several approaches can be considered:

1. **Branch prediction**: Modern CPUs use branch prediction to guess which branch will be taken at runtime. This technique can reduce the overhead of conditional jumps.
2. **Just-In-Time (JIT) compilation**: Some JavaScript engines, like V8 in Chrome, use JIT compilation to optimize performance-critical code. This involves compiling the code into machine code at runtime.
3. **Native code generation**: Some frameworks and libraries, like WebAssembly, allow developers to generate native code for their applications.

In terms of alternative benchmarking approaches, MeasureThat.net uses a variety of methods, including:

1. **User Agent-based testing**: The platform tests on different browsers and devices with varying User Agents.
2. **Multi-threaded testing**: Some benchmarks are executed multiple times concurrently to simulate concurrent execution.
3. **Device-level testing**: Browsers can be tested on different devices to simulate various hardware configurations.

In summary, the provided benchmark definition and test cases demonstrate a creative approach to conditional statements and arithmetic operations using a custom function `branchlessMap`. The approach might offer performance benefits, but its effectiveness depends on specific use cases and environments.

Related benchmarks:

branchfuncofbranchlessmapfuncforkfork (version: 0)

idk

Comparing performance of: branch vs branchless map

Created: 4 years ago by: Guest

Jump to the latest result

branch

branchless map

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):