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wip(assembler): round L7 -- shared column cache across workers: whole view 16-19% faster, world unchanged

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SharedColumnCache.h: a world-owned, bounded 4-way second-tier cache of exact column values
(heightfield and floating islands), keyed by recipe/plan identity plus content hash, XY and island
id. Lock-free seqlock reads; set-local spin lock on misses. The FLazy thread-local tier stays
first. 83.6% of repeated column work was cross-worker; formula evaluations -60.9%.
W12 L1 view: Luna 2.165 -> 1.754 s; reviewer interleaved 2.059 -> 1.722 s. 8 m crossing new tiles
82 -> 52 ms. +66 MiB peak RSS. All hashes (whole view, per-LOD, exact queries, islands seed 0)
identical at W1/W8/W12, Clang off and GCC default. MSVC/UBT not compiled here.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CSFYgsdW8ejZSyiMf4qRSX
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Fr0zkaandClaude Opus 5.5 committed 2026-10-19 21:46:15 +02:00
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commit 4b1108bf86
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CODEMAP.md
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@@ -158,7 +158,8 @@ remains `0`, and lateral regions remain gated off.
| `VoxelForge.Build.cs` | Deps: Core, CoreUObject, Engine, **GameplayTags**, **RealtimeMeshComponent**, `VoxelForgeCore`. `AVoxelWorld::bUseVoxelForgeCore` opts into the Core runtime route; it defaults off. |
| `../../VoxelForgeCore/VoxelForgeCore.Build.cs` | C++20 runtime module. Reads `Standalone/Core/core_sources.txt`, validates one include shim per canonical source, and fails UBT on missing, extra, or mismatched shims. No unity/PCH; private copied implementation stays under `vfcore::detail`. |
| `../../VoxelForgeCore/Private/Manifest/VFCore_*.cpp` | Eighteen one-source UBT shims that include canonical files under `Standalone/`; they do not copy Core implementation. The API-boundary row includes `Core/src/VoxelForgeCore.cpp` directly. |
| `../../Standalone/Core/include/VoxelForgeCore/ThreadLocalStorage.h` | `VoxelForgeCoreThreadLocal::FLazy<T>`: thread-local handle that heap-allocates a worker-private cache on first use. All large Core and legacy caches use it (HeightfieldColumnCache, IslandColumnCache, GFloorReliefCache, GRoomGraphCache, GSurfColCache, tunnel/diff caches). See ARCHITECTURE §8.10. |
| `../../Standalone/Core/include/VoxelForgeCore/ThreadLocalStorage.h` | `VoxelForgeCoreThreadLocal::FLazy<T>`: thread-local handle that heap-allocates a worker-private cache on first use. Large worker-local caches use it (HeightfieldColumnCache, IslandColumnCache, GFloorReliefCache, GRoomGraphCache, GSurfColCache, tunnel/diff caches). See ARCHITECTURE §8.10. |
| `../../Standalone/Core/include/VoxelForgeCore/SharedColumnCache.h` | Bounded four-way second-tier cache for exact per-column values. Readers use versioned atomic slots without a lock; misses use a set-local spin lock. World-owned lifetime, recipe/plan identity and content hashes, XY and optional sub-domain identity. SurfaceWorld and FloatingIslands share this mechanism; see ARCHITECTURE §8.35. |
| `../../Standalone/Core/src/CoreNamespacePreamble.h` | First include of every Core TU. Forces FP contraction off per compiler (Clang/MSVC/GCC pragmas; unknown compiler = `#error`) and defines `vfcore::fp_contract::selfTest`, which `World::compile` runs before building: a fused multiply-add (e.g. Clang `-ffp-contract=fast`) refuses world generation. The world depends on contraction (Linux2/Linux3 reports), so never remove either. |
| `../../VoxelForgeCore/Private/ModuleEntry/` | Unreal module entry and an isolated `CoreMinimal.h` shim for the actual engine header. |
| `../../Standalone/Core/include/VoxelForgeCore/VoxelForgeCore.h` | Standard-library-only public Core API. `VOXELFORGECORE_API` exports the API from the Unreal module and is empty for standalone builds. |