AOT region backend, and the reason the LLVM path was slower than the C backend - #16

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dougchansan wants to merge 84 commits into

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dougchansan:feature/llvm-aot-regions

Commits on Aug 12, 2026

Add Phase 0 instrumentation: counters, JSON perf report, generated header
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edf5a1c
Add whole-title CFG and call-graph model
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51336ae
Infer function entries by elimination; add cfg_stats
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94b0672
Add deterministic region planner
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70a1777
Add llvm-aot backend driven by the region plan
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a42b885
Grow regions along addresses when the call graph runs dry
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67153d1
Add title benchmark harness
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3041e9b
Record Luigi's Mansion runtime and build-cost baselines
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454ba4e
Record the benchmark metric decision and Phase 1c status
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8735d5d
Add benchmark matrix driver
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c5a1b77
Record that the adjacency merge does not pay for itself
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3b8d84a
Gate benchmark measurement on real frame progress
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b15a649
Measure a fixed frame count, and add environment fallbacks
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01b2cab
Record measurement methodology and the fixed-chunk runtime baseline
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b69bf33
Add DOLRECOMP_FORCE_BACKEND for callers that hardcode --backend
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ec347f9
Document the force-backend override and its precedence
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01a5e25
Fix manifest format broken for the module template
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042338b
Add arm comparison with a noise floor
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e1493f4
Quantify where region compile time goes
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22d2cbe
Refuse to compare arms that ran different guest work
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7274396
Report counters per million guest cycles
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0b29088
Record the moderngekko-port module cache hazard
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8b45fae
Add build_module.sh: per-configuration output dirs and a backend check
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fe46dfe
Establish Mario Kart as the primary benchmark title
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0e8c2d3
Choose the dispatch lookup from the plan's shape, not an env var
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eef9d28
Emit a coverage manifest alongside the page index
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4cfc434
Let the Dolphin user directory outlive the output tree
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846b835
Point the matrix at a user directory outside the results tree
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3190d83
Record the Mario Kart same-scene head-to-head
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cad2699
Static crossings do not predict the runtime dispatcher rate
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4f57213
Seed PGO region accretion from the hottest functions, and fix the profile parser
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596f35f
Let cfg_stats load a region profile
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465e840
Reload only live guest state after a cross-region call
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d69bbc5
Bump the object cache version for the liveness change
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f9202bc
Region formation does not change the dispatcher rate
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26af4d9
Weight the terminator mix by profile: Phase 4 should target blr, not bctr
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b7f0234
Narrow materialize to slots a path to the barrier may have written
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10b7a00
Add the differential test suite, and it finds an stfs divergence
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f8cb669
Revert the liveness-narrowed reload: it hung Mario Kart
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3551fb7
Record why the differential suite cannot cover calls yet
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da790ae
Record that dispatch helpers alone do not fix the call-path coverage
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96f634d
Rewrite the status section around what the measurements showed
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90a557c
Cover calls in the differential suite; it fails both barrier optimisations
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e885b52
Teach reaching-writes about helper writes, conservatively
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8eba0cd
Record the barrier store narrowing result: -12% code, -23% build time
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ae18555
Move internal region bodies to fastcc
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fd6ccde
Retract the store narrowing win: the module does not run
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d2d7ad8
Fix the third root cause: indirect-switch edges missing from both passes
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2d373a4
Gate barrier narrowing and region inlining behind flags, both off by default
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2b110c5

Commits on Aug 13, 2026

Commits on Aug 14, 2026

Commits on Aug 15, 2026

Measure this branch's work on AArch64: parity, both core modes
dougchansan
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f472719

Commits on Aug 19, 2026

Withdraw the AArch64 parity result: the module was not executing
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46672a7