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Bound Lua inlining by register pressure - #1291

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Frotty merged 9 commits into
big-lua-opt-updatefrom
codex/lua-register-budget
Sep 4, 2026
Merged

Bound Lua inlining by register pressure#1291
Frotty merged 9 commits into
big-lua-opt-updatefrom
codex/lua-register-budget

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@Frotty Frotty commented Sep 4, 2026

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Summary

  • reuse typed IM locals across non-overlapping live ranges with deterministic coloring and same-locality coalescing
  • replace quadratic live-set clique construction with definition/live-out interference edges
  • bound Lua inlining at a 190-register pressure budget and refresh CFG liveness after large nested expansions
  • preserve direct div/mod lowering through identity-tracked compiler helpers without reopening spills

Acceptance evidence

  • Zombie Defense production Lua: 0 locals-table spill functions and 0 __wurst_locals[...] accesses
  • hot functions vec2_onBlockerCleared2x2, unit_setPathingMap, isReachableWithinDetour, and findLocalSurfaceEnemy remain register-based
  • 0 __wurst_ensureInt/Real/Str, __wurst_intDiv, and __wurst_modInt calls; direct output retains 229 math.fmod and 282 // occurrences
  • production map build completed in about one minute on the optimized fork checkout
  • za-bench PASS at 1x: collect-human-targets 66.15 us, find-local-surface-hot 103.75 us, detour-probe 4.89 us

Checks

  • ./gradlew.bat test — PASS (5m01s)
  • focused LuaTranslationTests, LuaBackendAuditTests, and OptimizerTests — PASS
  • grill typecheck — PASS
  • grill test --quiet — PASS
  • grill build Zombie_Defense_02-folder.w3x --dev — PASS
  • node e2e/run-zombie-e2e.cjs --suite=za-bench — PASS

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📝 Code Review Completed 2026-09-04T10:30:12.202163Z b2d8145 Manual request
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@Frotty
Frotty merged commit 7e8016d into big-lua-opt-update Sep 4, 2026
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Frotty deleted the codex/lua-register-budget branch September 4, 2026 10:40
Frotty added a commit that referenced this pull request Sep 4, 2026
* Stop the local-player barrier from refusing inlining on control taint (#1284)

* Optimize Lua array reads and div/mod emission (#1288)

* Optimize Lua array reads and div-mod intrinsics

Remove typed primitive array normalization, invert legacy assertions to require raw reads, and keep erased-generic normalization intact. Emit raw div/mod primitives directly as Lua operators without helper definitions.

* Track Lua numeric intrinsics by IM identity

* Give vararg calls a fixed-arity copy on Lua (#1286)

* Inline small Lua helpers regardless of popularity (#1289)

* Deduplicate Lua callback adapters (#1290)

* Deduplicate Lua callback adapters

* Preserve renamed Lua callback targets

* Bound Lua inlining by register pressure (#1291)
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