Benchmark: Math.floor x tilde

Tests:

FastFloor
var data = 123456.12121442142; return ~~(data * 1)/1;
Math.floor
var data = 123456.12121442142; Math.floor(data);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
FastFloor
Math.floor

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Linux; Android 9; SM-G611MT) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 102 on Android

View result in a separate tab

Test name	Executions per second
FastFloor	142984288.0 Ops/sec
Math.floor	642763.4 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

The provided JSON represents two benchmark test cases, each designed to measure the performance difference between two approaches: the bitwise NOT operator (~) and the Math.floor function.

**Benchmark Definition**

The benchmark definition is a simple JavaScript statement that performs a specific operation:

* `var data = 123456.12121442142;` initializes a variable `data` with a large floating-point number.
* `return ~~(data * 1)/1;` applies the bitwise NOT operator (~) to the result of multiplying `data` by 1, effectively performing integer truncation. The `/1` at the end ensures that the result is an integer.
* `var data = 123456.12121442142; Math.floor(data);` simply uses the built-in `Math.floor` function to truncate the floating-point number.

**Options Compared**

The two approaches being compared are:

1. **Bitwise NOT operator (~)**: This approach uses the bitwise NOT operator, which is a binary operation that flips all bits of its operand.
2. **Math.floor**: This approach relies on the built-in `Math.floor` function, which returns the largest integer less than or equal to the given number.

**Pros and Cons**

* **Bitwise NOT operator (~)**:
	+ Pros: Simple, lightweight, and fast. The bitwise NOT operator is a native operation in JavaScript, so it doesn't incur any overhead.
	+ Cons: Can be tricky to read and understand, as it's not immediately clear what the operator does. Additionally, this approach may not work correctly for non-integer values (e.g., NaN or Infinity).
* **Math.floor**:
	+ Pros: More readable and maintainable than the bitwise NOT operator. The `Math.floor` function is well-documented and widely understood.
	+ Cons: Slightly slower due to the overhead of calling a built-in function.

**Other Considerations**

In addition to these two approaches, it's worth noting that there may be other ways to achieve integer truncation in JavaScript, such as using the `|0` trick or bitwise shift operators. However, these alternatives are less common and may not be as straightforward to understand.

**Library/Function Used**

Neither of these benchmark test cases uses any external libraries or functions beyond the standard library provided by JavaScript (e.g., Math.floor).

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax used in either benchmark definition. Both tests rely on standard JavaScript syntax and semantics.

**Other Alternatives**

For integer truncation, other alternatives to the bitwise NOT operator include:

* `|0` trick: `x | 0`
* Bitwise shift operators:
	+ `x >> 0` (right shift)
	+ `x << 0` (left shift)

However, these alternatives may not be as fast or efficient as the bitwise NOT operator in all cases.

Overall, the benchmark test cases provide a simple and straightforward way to compare the performance of two approaches: the bitwise NOT operator and the Math.floor function.

Related benchmarks:

Math.floor x tilde (version: 0)

Comparing performance of: FastFloor vs Math.floor

Created: 3 years ago by: Registered User

Jump to the latest result

FastFloor

Math.floor

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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