31 lines
1.2 KiB
Markdown
31 lines
1.2 KiB
Markdown
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# Phase 82: C2 Local Cache — Hot Path Exclusion (Hardening)
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## Goal
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Keep the Phase 79-1 C2 local cache as a research box, but **guarantee it is not evaluated on hot paths** (alloc/free), so it cannot accidentally affect SSOT performance while remaining available for future research.
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This matches the repo’s layout-tax learnings:
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- Avoid physical deletion/link-out for “unused” features (can regress via layout changes).
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- Prefer **default OFF + not-referenced-on-hot-path** for frozen research boxes.
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## What changed
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Removed any alloc/free hot-path attempts to use C2 local cache.
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- Alloc hot path: `core/box/tiny_front_hot_box.h`
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- C2 local cache probe blocks removed.
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- Free legacy fallback: `core/box/tiny_legacy_fallback_box.h`
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- C2 local cache probe blocks removed.
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Includes and implementation files remain in the tree (research box preserved):
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- `core/box/tiny_c2_local_cache_env_box.h`
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- `core/box/tiny_c2_local_cache_tls_box.h`
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- `core/front/tiny_c2_local_cache.h`
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- `core/tiny_c2_local_cache.c`
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## Behavior
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- `HAKMEM_TINY_C2_LOCAL_CACHE=1` does **not** change the Mixed SSOT behavior because no hot-path code checks it.
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- Research work can reintroduce it behind a separate, explicit boundary when needed.
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