Benchmark: Math.ceil vs >>>

Tests:

Math.ceil
let i2 = 0; for(let i = 0; i < 100000; i++){ i2 += Math.ceil(i)}
>>>
let i3 = 0; for(let i = 0; i < 100000; i++){ i3 +=((i+1)>>>1)}

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Math.ceil
>>>

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.

I'll break down the benchmark and explain what's being tested, compared options, pros and cons, and other considerations.

**Benchmark Overview**

The benchmark is designed to compare the performance of two approaches:

1. `Math.ceil`: using the `Math.ceil` function to round up a value to the nearest integer.
2. Bitwise shift operator (`>>>`): shifting the bits of an unsigned integer to fill the gap left by zeros, effectively rounding up.

**Test Cases**

There are two test cases:

### 1. `Math.ceil`

This test case runs a loop that increments a variable `i2` using `Math.ceil(i)`, where `i` ranges from 0 to 100,000.

```javascript
let i2 = 0;
for (let i = 0; i < 100000; i++) {
    i2 += Math.ceil(i);
}
```

**Pros and Cons:**

* **Pros:** Easy to understand, straightforward implementation.
* **Cons:** May have overhead due to the `Math.ceil` function call.

### 2. `>>`

This test case runs a loop that increments a variable `i3` using the bitwise shift operator (`>>>`) with an offset of 1, effectively rounding up.

```javascript
let i3 = 0;
for (let i = 0; i < 100000; i++) {
    i3 += ((i + 1) >>> 1);
}
```

**Pros and Cons:**

* **Pros:** Fast, efficient way to round up values.
* **Cons:** May be less readable due to the use of bitwise operators.

**Library and Special Features**

The benchmark uses none of its own libraries. However, it assumes that the JavaScript engine being tested supports the `>>>` operator, which is a part of the ECMAScript 2016 specification (ES6).

No special features or syntax are used in this benchmark.

**Alternative Approaches**

Other alternatives to test rounding up values might include:

* Using integer arithmetic (`i2 = i + (1 - i % 1)` or `i3 = i / 2 + i / 2`).
* Using a binary search approach to find the smallest integer greater than or equal to the target value.
* Using a custom implementation of rounding up, such as using a lookup table.

These alternatives might provide different insights into the performance characteristics of the JavaScript engine being tested.

Related benchmarks:

Math.ceil vs >>> (version: 0)

Comparing performance of: Math.ceil vs >>>

Created: 3 years ago by: Guest

Jump to the latest result

Math.ceil

>>>

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):