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hakorune/docs/development/current/main
nyash-codex dc4eda9cdc docs: Phase 195 implementation status + Phase 196 (Select bug) planning
Phase 195 implementation complete (Lowerer side):
- loop_with_if_phi_minimal.rs: multi-carrier PHI generation (sum + count)
- pattern3_with_if_phi.rs: dynamic single/multi-carrier handling
- ExitLine/CarrierVar.join_id: NO CHANGES NEEDED (existing infra worked!)
- YAGNI principle validated - PhiGroupBox was not necessary

Blocker discovered: Nested Select→Branch+Phi conversion bug
- JoinIR correctly generates: ValueId(20) = phi [(bb3, 14), (bb4, 18)]
- MIR incorrectly produces: %27 = phi [%28, bb8], [%32, bb9] (undefined)
- Root cause: joinir_block.rs Select expansion (bridge layer)
- NOT a Phase 195 issue - pre-existing bug in Select conversion

Phase 196 planned (NEW):
- 196-1: Document select_expansion / instruction_rewriter responsibilities
- 196-2: Formalize "1 Select = 3 blocks + 1 PHI" interface
- 196-3: Debug block reuse / block ID mapping
- 196-4: Fix and E2E test (phase195_sum_count.hako → 72)

Documentation updates:
- phase195-pattern3-extension-design.md: Implementation Status section
- CURRENT_TASK.md: Phase 195 complete + Phase 196 TODO
- joinir-architecture-overview.md: P3 Lowerer complete, bridge blocker noted

Key insight: "Pattern side is done, problem is in bridge side"

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
2025-12-09 13:58:31 +09:00
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