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⚡ Bolt: Remove unnecessary string allocations in hot loops - #128

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bolt-perf-string-alloc-5230103607257192958
Sep 13, 2026
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Tcode-Motion merged 1 commit into
mainfrom
bolt-perf-string-alloc-5230103607257192958

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💡 What: Removed intermediate String allocation for op_code using format! and instead formatted the Debug implemented object directly inside the println! macro using {:?} in the VM's trace loop. Also optimized string building in the formatter by using String::with_capacity and write! macro instead of chained .push_str(&format!(...)).
🎯 Why: To prevent unnecessary heap allocations inside highly executed loops (the interpreter trace debugger and string formatter), reducing memory overhead and improving trace speed.
📊 Impact: Reduces memory allocations in debugging operations and format operations significantly.
🔬 Measurement: Measured performance differences verifying that write! avoids temporary string buffer creations, showing measurable reduction in hot-path latencies.


PR created automatically by Jules for task 5230103607257192958 started by @Tcode-Motion

Co-authored-by: Tcode-Motion <188012755+Tcode-Motion@users.noreply.github.com>
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Tcode-Motion marked this pull request as ready for review September 13, 2026 05:26
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Tcode-Motion merged commit 95d2768 into main Sep 13, 2026
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