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feat: Optimize IsIPv6 parsing#163

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ReneWerner87 merged 2 commits intomasterfrom
feat-optimize-isipv6-parsing
Nov 30, 2025
Merged

feat: Optimize IsIPv6 parsing#163
ReneWerner87 merged 2 commits intomasterfrom
feat-optimize-isipv6-parsing

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@google-labs-jules
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This change introduces a lookup table for hexadecimal character parsing within the IsIPv6 function in ips.go. This optimization replaces a series of if/else if statements with a more efficient array lookup, resulting in a measurable performance improvement. The benchmarks confirm that the new implementation is approximately 10% faster than the original. All existing tests pass, ensuring that the function's behavior remains unchanged.


PR created automatically by Jules for task 6995809688731757462 started by @ReneWerner87

Replaced the conditional checks for hexadecimal characters with a lookup table to improve performance. Benchmarks show an approximate 10% speed improvement for the `IsIPv6` function.
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codecov bot commented Nov 30, 2025

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.15%. Comparing base (d531ec6) to head (6210d01).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files
@@            Coverage Diff             @@
##           master     #163      +/-   ##
==========================================
- Coverage   83.31%   83.15%   -0.16%     
==========================================
  Files          11       11              
  Lines         755      748       -7     
==========================================
- Hits          629      622       -7     
  Misses        115      115              
  Partials       11       11              
Flag Coverage Δ
unittests 83.15% <100.00%> (-0.16%) ⬇️

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@ReneWerner87 ReneWerner87 marked this pull request as ready for review November 30, 2025 16:50
@ReneWerner87 ReneWerner87 requested a review from a team as a code owner November 30, 2025 16:50
@ReneWerner87 ReneWerner87 requested review from ReneWerner87, efectn, gaby and sixcolors and removed request for a team November 30, 2025 16:50
This commit addresses a linting issue in the IsIPv6 function by refactoring the loop to follow the "early return" pattern and applying De Morgan's law to the conditional, as suggested by the linter.
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master:

Benchmark_IsIPv6/fiber-4          16310833	        73.65 ns/op	       0 B/op	       0 allocs/op
Benchmark_IsIPv6/default-4        14110561	        85.10 ns/op	       0 B/op	       0 allocs/op

PR:

Benchmark_IsIPv6/fiber-4          18563126	        64.70 ns/op	       0 B/op	       0 allocs/op
Benchmark_IsIPv6/default-4        13572196	        88.39 ns/op	       0 B/op	       0 allocs/op

@ReneWerner87 ReneWerner87 merged commit 102ffbf into master Nov 30, 2025
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@ReneWerner87 ReneWerner87 deleted the feat-optimize-isipv6-parsing branch November 30, 2025 17:03
@google-labs-jules
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master:

Benchmark_IsIPv6/fiber-4          16310833	        73.65 ns/op	       0 B/op	       0 allocs/op
Benchmark_IsIPv6/default-4        14110561	        85.10 ns/op	       0 B/op	       0 allocs/op

PR:

Benchmark_IsIPv6/fiber-4          18563126	        64.70 ns/op	       0 B/op	       0 allocs/op
Benchmark_IsIPv6/default-4        13572196	        88.39 ns/op	       0 B/op	       0 allocs/op

Thank you for the detailed benchmark comparison. You're right to point out the slight regression in the default benchmark. My focus was on optimizing the fiber implementation, which shows a significant performance improvement of ~12%.

Since the main goal of this library is to provide a faster alternative to the standard library functions, I believe this trade-off is worthwhile. The default benchmark serves as a baseline for comparison, and the core goal of making the fiber version faster has been achieved.

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