Benchmark: test ABS 4 - MeasureThat.net

Script Preparation code:

var abs = Math.abs
var x = -0.00034254146579137945;
var cycle_counter = 10000000;

Tests:

Math.abs
for(i=0; i<cycle_counter; i++){ var result = Math.abs(x); }
abs
for(i=0; i<cycle_counter; i++){ var result = abs(x); }
Custom1
for(i=0; i<cycle_counter; i++){ var negative = x < 0.0 ? 1 : 0; var result = x - x * 2.0 * negative; }
Custom2
for(i=0; i<cycle_counter; i++){ var result = x & -1; }
Compare
for(i=0; i<cycle_counter; i++){ var result = x < 0 ? -x : x }
Bitshift
for(i=0; i<cycle_counter; i++){ var result = (x ^ (x >> 31)) - (x >> 31) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Math.abs
abs
Custom1
Custom2
Compare
Bitshift

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:133.0) Gecko/20100101 Firefox/133.0

Browser/OS: Firefox 133 on Linux

View result in a separate tab

Test name	Executions per second
Math.abs	71.1 Ops/sec
abs	83.6 Ops/sec
Custom1	55.8 Ops/sec
Custom2	83.2 Ops/sec
Compare	67.1 Ops/sec
Bitshift	83.6 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring JavaScript performance is an essential task for any developer. Let's dive into the provided benchmark and explain what's being tested, the pros and cons of each approach, and other considerations.

**Benchmark Overview**

The benchmark tests the execution speed of different methods to calculate the absolute value of a negative number `x`. The test cases use various approaches:

1. **Math.abs**: The built-in `Math.abs` function.
2. **abs**: A custom function that wraps `Math.abs`.
3. **Custom1**: A custom function that uses bit manipulation to negate `x` before calculating its absolute value.
4. **Custom2**: A custom function that performs a bitwise AND operation with `-1` to get the two's complement of `x`, effectively negating it.
5. **Compare**: A custom function that compares `x` to zero and returns the negation if negative, otherwise returns the original value.
6. **Bitshift**: A custom function that uses bit shifting to calculate the absolute value of `x`.

**Options Compared**

The benchmark tests the performance of each approach by executing the same code in a loop for a large number of iterations (defined by the `cycle_counter` variable). The results are then compared across different browsers, devices, and operating systems.

**Pros and Cons of Each Approach:**

1. **Math.abs**: Pros:
	* Widely supported and well-maintained.
	* Simple and efficient implementation.
Cons:
	* May incur additional overhead due to the function call.
2. **abs**: Pros:
	* Customizable and potentially more efficient than `Math.abs`.
Cons:
	* Requires defining a custom function, which may add complexity.
3. **Custom1**: Pros:
	* Uses bitwise operations, which can be faster in some cases.
Cons:
	* May have performance regressions due to the bit manipulation.
4. **Custom2**: Pros:
	* Another efficient use of bitwise operations.
Cons:
	* May also incur performance regressions or unexpected behavior.
5. **Compare**: Pros:
	* Simple and easy to understand implementation.
Cons:
	* May be slower than other approaches due to unnecessary comparisons.
6. **Bitshift**: Pros:
	* Uses efficient bit shifting operations.
Cons:
	* May have performance regressions or unexpected behavior.

**Other Considerations:**

1. **Library usage**: None of the custom functions use any external libraries, which is a good thing!
2. **Special JS features**: The benchmark doesn't test any special JavaScript features, such as async/await, generators, or WebAssembly.
3. **Alternative approaches**: Other possible approaches to calculate absolute value could include using `Number()` or `NaN` (Not-a-Number) values.

**Alternatives:**

If you're looking for alternative ways to measure JavaScript performance, consider the following options:

1. **Benchmarking libraries**: Tools like Benchmark.js or js-benchmark provide more advanced features and flexibility for creating benchmarks.
2. **ES6+ APIs**: Consider using modern JavaScript features like `Math.abs` with optional chaining (`?.`) or object destructuring (`...`) to improve performance.
3. **Native WebAssembly support**: If you're targeting a specific platform or use case, explore native WebAssembly support for improved performance.

Remember that measuring performance is just one aspect of software development. Always consider the trade-offs and nuances involved in each approach, and choose the best fit for your specific needs.

Related benchmarks:

test ABS 4 (version: 0)

Comparing performance of: Math.abs vs abs vs Custom1 vs Custom2 vs Compare vs Bitshift

Created: 3 years ago by: Guest

Jump to the latest result

Math.abs

abs

Custom1

Custom2

Compare

Bitshift

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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