fa8727c2f8
Phase 196 investigation & fix plan for JoinIR→MIR Select conversion bug: - Goal: Fix "correct PHI in JoinIR → undefined PHI inputs in MIR" issue - Scope: Bridge layer only (join_ir_vm_bridge / merge line) Task breakdown: - 196-1: Minimal reproduction case (phase195_sum_count.hako) - Record expected JoinIR structure (ValueIds, block IDs) - Record broken MIR structure (undefined PHI inputs) - Identify which Select instruction causes the bug - 196-2: Select expansion path analysis (read-only) - Locate handle_select in joinir_block.rs - Understand "1 Select = 3 blocks + 1 PHI" conversion - Document responsibility locations - 196-3: Fix strategy (no new boxes) - Candidate 1: PHI inputs ValueId check (use emit results) - Candidate 2: Block reuse vs overwrite (Phase 33-20 lesson) - Candidate 3: JoinInlineBoundary remapper usage (remap before PHI) - One-at-a-time fix approach - 196-4: E2E re-verification + regression check - phase195_sum_count.hako → 72 - loop_if_phi.hako (single-carrier P3) - P1/P2/P4 representative tests - 196-5: Documentation updates - phase196-select-bug-analysis.md (Before/After) - CURRENT_TASK.md (Phase 196 completion) - overview (Select expansion line verified) Design principles: - Minimal changes (existing Select expansion logic only) - Focus on one candidate at a time (Fail-Fast) - Explicit errors (remapper.get_value() must not silently fail) - Document-driven (record Before/After for future reference) Success criteria: - phase195_sum_count.hako outputs 72 - No SSA-undef / PHI errors - No regressions in P1/P2/P3/P4 tests 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Nyash Development Documentation 🔧
開発者向けの進行中タスクと開発計画ドキュメントです。
📂 ディレクトリ構造
current/
CURRENT_TASK.md- 現在進行中のタスク- アクティブな開発作業の詳細
- 最新の実装状況
roadmap/
- phases/ - フェーズ別開発計画
- phase-8/ - AST→MIR変換
- phase-9/ - VM/JIT実装
- phase-10/ - AOT最適化
- native-plan/ - ネイティブビルド計画
- 実行バックエンド統合
- パフォーマンス目標
proposals/
- RFC（Request for Comments）
- 新機能提案
- 設計ディスカッション
🎯 重要な参照先
- 進行状況:
current/CURRENT_TASK.md - 開発計画:
roadmap/phases/ - 技術提案:
proposals/
📝 注意事項
このディレクトリの内容は開発中であり、頻繁に変更されます。
安定した仕様はreference/を参照してください。