Benchmark: AND for VR4300 - MeasureThat.net

Script Preparation code:

let buf = new ArrayBuffer(24);
u64 = new BigUint64Array(buf);
s64 = new BigInt64Array(buf);

let bufHi = new ArrayBuffer(12);
let bufLo = new ArrayBuffer(12);
u32Lo = new Uint32Array(bufLo);
u32Hi = new Uint32Array(bufHi);
s32Lo = new Int32Array(bufLo);
s32Hi = new Int32Array(bufHi);

Tests:

Using BigIntArray
u64[0] = u64[1] & u64[2];
Using Int32Array / Uint32Array
u32Lo[0] = u32Lo[1] & u32Lo[1]; u32Hi[0] = u32Hi[1] & u32Hi[2];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Using BigIntArray
Using Int32Array / Uint32Array

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its test cases.

**Benchmark Overview**

The benchmark measures the performance of different JavaScript approaches to implement bitwise AND operations on unsigned 64-bit integers (u64) and unsigned 32-bit integers (u32). The tests are designed to compare the efficiency of using BigIntArray versus Int32Array/Uint32Array for these operations.

**Test Cases**

There are two test cases:

1. **Using BigIntArray**: This test case uses the `BigUint64Array` and `BigInt64Array` constructors to create arrays that can handle 64-bit integers. The benchmark definition is a simple bitwise AND operation between three consecutive elements in the array (`u64[0] = u64[1] & u64[2];`). The script preparation code sets up the necessary array buffers and constructors.
2. **Using Int32Array/Uint32Array**: This test case uses the `Int32Array` and `Uint32Array` constructors to create arrays that can handle 32-bit integers. The benchmark definition is a simple bitwise AND operation between two consecutive elements in different parts of the array (`u32Lo[0] = u32Lo[1] & u32Lo[1];` and `u32Hi[0] = u32Hi[1] & u32Hi[2];`). The script preparation code sets up the necessary array buffers, constructors, and type conversions between integers.

**Pros and Cons**

Here are some pros and cons of each approach:

* **BigIntArray**: Pros:
	+ Can handle larger integers (up to 2^68 - 1) without losing precision.
	+ May be more efficient for operations involving very large numbers.
Cons:
	+ Requires a modern JavaScript engine that supports BigInt.
	+ May have performance overhead due to the use of arbitrary-precision arithmetic.
* **Int32Array/Uint32Array**: Pros:
	+ Wide support across different browsers and engines, including older versions.
	+ Typically faster execution speeds for smaller integers.
Cons:
	+ Limited to 32-bit integer range (up to 2^31 - 1).
	+ May lose precision when dealing with very large numbers.

**Library Considerations**

The benchmark uses the following libraries:

* `BigUint64Array`: A typed array that can handle arbitrary-precision unsigned 64-bit integers.
* `BigInt64Array`: A typed array that can handle arbitrary-precision signed 64-bit integers (not used in this benchmark).

These libraries are part of the JavaScript standard library and provide support for working with large integers.

**Special JS Features**

There is no special JavaScript feature or syntax mentioned in the provided code snippet. However, it's worth noting that some older browsers may not support BigInt or arbitrary-precision arithmetic.

**Alternative Approaches**

Other approaches to implement bitwise AND operations could include:

* Using a library like `numjs` or `mathjs`, which provide optimized implementations for numerical computations.
* Implementing the operation manually using bit manipulation instructions (e.g., `AND` Assembly instruction).
* Using a different data structure, such as a buffer or a vector, to represent the numbers.

Keep in mind that these alternatives may not be suitable for all use cases and may require significant modifications to the benchmark code.

Latest run results:

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

User agent: Mozilla/5.0 (Android 13; Mobile; rv:109.0) Gecko/116.0 Firefox/116.0

Browser/OS: Firefox Mobile 116 on Android

View result in a separate tab

Test name	Executions per second
Using BigIntArray	147601856.0 Ops/sec
Using Int32Array / Uint32Array	429875424.0 Ops/sec

Related benchmarks:

AND for VR4300 (version: 0)

Implementation of AND for n64.

Comparing performance of: Using BigIntArray vs Using Int32Array / Uint32Array

Created: one year ago by: Registered User

Jump to the latest result

Using BigIntArray

Using Int32Array / Uint32Array

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):