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Summary of ChangesHello @ReneWerner87, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request focuses on enhancing the performance of the Highlights
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Code Review
The pull request introduces an optimized TrimSpace function in byteseq.go that is designed to be faster for ASCII strings by directly checking character values instead of using a lookup table. This change also allows for the removal of the whitespaceTable from common.go, which is a good cleanup. The new implementation correctly handles edge cases like empty strings and strings consisting entirely of whitespace. The optimization appears sound and maintains the intended functionality for ASCII whitespace trimming.
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Pull request overview
This PR optimizes the TrimSpace function by simplifying its implementation while maintaining correctness and improving performance. The benchmark results show performance improvements ranging from 14-26% for most realistic use cases (ASCII strings with actual content), with minor regressions only for empty strings and strings consisting entirely of whitespace.
Key Changes:
- Simplified the trimming logic by combining the boundary search into two compact loops
- Removed intermediate variables and conditional checks for cleaner, more efficient code
- Maintained compatibility with the original behavior including edge cases like all-whitespace strings
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WalkthroughThe Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~10 minutes
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Pre-merge checks and finishing touches✅ Passed checks (3 passed)
✨ Finishing touches
🧪 Generate unit tests (beta)
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Actionable comments posted: 0
🧹 Nitpick comments (1)
byteseq.go (1)
95-100: Consider checking empty before computing indices to recover performance.The benchmark shows a +15.78% regression for the empty input case. This is likely because
j = len(s) - 1is computed before checking if the string is empty.Apply this diff to optimize the empty case:
func TrimSpace[S byteSeq](s S) S { + // fast path for empty string + if len(s) == 0 { + return s + } + i, j := 0, len(s)-1 - // fast path for empty string - if j < 0 { - return s - } - // Find first non-whitespace from start for ; i <= j && whitespaceTable[s[i]]; i++ { //nolint:revive // we want to check for multiple whitespace chars }This avoids the subtraction for empty inputs and uses a more direct check, which should recover the performance loss.
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🔇 Additional comments (1)
byteseq.go (1)
94-111: Good optimization for typical use cases.The refactored implementation shows solid performance improvements for realistic inputs (14-26% faster for strings with content), which is where optimization matters most. The algorithm is correct, and the two-index approach maintains consistency with the
Trimfunction, improving maintainability.The performance regression on edge cases (empty +15.78%, spaces +23.73%) is a reasonable trade-off given the improvements elsewhere, though the empty case can be recovered with the suggested optimization above.
│ old.txt │ new.txt │ │ sec/op │ sec/op vs base │ _TrimSpaceBytes/fiber/empty-12 0.3391n ± 1% 0.3729n ± 2% +9.97% (p=0.000 n=20) _TrimSpaceBytes/fiber/spaces-12 2.754n ± 1% 3.315n ± 1% +20.33% (p=0.000 n=20) _TrimSpaceBytes/fiber/ascii-word-12 4.780n ± 1% 3.843n ± 2% -19.61% (p=0.000 n=20) _TrimSpaceBytes/fiber/auth-header-bearer-12 5.464n ± 1% 4.427n ± 2% -18.97% (p=0.000 n=20) _TrimSpaceBytes/fiber/auth-header-basic-12 4.139n ± 1% 3.232n ± 1% -21.89% (p=0.000 n=20) _TrimSpaceBytes/fiber/accept-encoding-12 4.727n ± 1% 4.010n ± 2% -15.15% (p=0.000 n=20) _TrimSpaceBytes/fiber/content-type-12 4.748n ± 1% 3.943n ± 1% -16.95% (p=0.000 n=20) _TrimSpaceBytes/fiber/x-forwarded-for-12 3.831n ± 0% 3.010n ± 1% -21.43% (p=0.000 n=20) _TrimSpaceBytes/fiber/query-params-12 4.702n ± 1% 3.882n ± 1% -17.44% (p=0.000 n=20) _TrimSpaceBytes/fiber/ascii-long-12 5.620n ± 2% 4.785n ± 1% -14.85% (p=0.000 n=20) _TrimSpaceBytes/fiber/no-trim-12 2.358n ± 1% 1.781n ± 1% -24.45% (p=0.000 n=20) _TrimSpaceBytes/fiber/mixed-whitespace-12 5.312n ± 1% 4.417n ± 1% -16.84% (p=0.000 n=20) geomean 3.453n 2.971n -13.96%