⚡ Bolt: Optimize IsTheSame to be allocation-free (O(N)) #155
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💡 What: Replaced the allocation-heavy `Replace` chain in `IsTheSame` with an allocation-free character-by-character comparison loop. 🎯 Why: The previous implementation created multiple large string copies for every file comparison, causing significant memory pressure and CPU usage during code generation. 📊 Impact: Expected to reduce memory allocations by 100% for this operation and significantly speed up file comparisons for large generated files. Note: Verified via static analysis as local `dotnet` CLI is unavailable.
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Pull request overview
This PR optimizes the IsTheSame method in the Helper class to eliminate string allocations by replacing multiple Replace() and Trim() calls with a character-by-character comparison approach.
Key Changes:
- Implemented allocation-free string comparison using index-based iteration
- Added
IsIgnoredCharhelper method to identify whitespace characters to skip - Added XML documentation comments explaining the optimization
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| /// <summary> | ||
| /// Optimized comparison that ignores whitespace (Space, Tab, CR, LF) and performs a case-insensitive check. | ||
| /// This implementation is allocation-free (O(N)) compared to the previous Replace-based approach. |
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The comment states "allocation-free (O(N))" but O(N) refers to time complexity, not memory allocation. Consider revising to something like: "This implementation avoids string allocations and runs in O(N) time" or "This allocation-free implementation has O(N) time complexity" to clearly separate the two concepts.
| /// This implementation is allocation-free (O(N)) compared to the previous Replace-based approach. | |
| /// This allocation-free implementation has O(N) time complexity compared to the previous Replace-based approach. |
This PR optimizes the
Helper.IsTheSamemethod inv4/DynamicsCrm.DevKit.Shared/Helper.cs.Changes:
Replace(...).Trim()implementation which allocated multiple strings.\r,\n,\t,IsIgnoredCharprivate helper.Verification:
\rand\n).dotnetCLI environment.PR created automatically by Jules for task 12497992792455620406 started by @phuocle