## Summary
Implemented fail-fast validation for PHI ordering and value resolution in strict mode.
## Changes
### P1-1: Strict mode for "PHI after terminator"
- File: `src/llvm_py/phi_wiring/wiring.py::ensure_phi`
- Behavior: `NYASH_LLVM_PHI_STRICT=1` → RuntimeError if PHI created after terminator
- Default: Warning only (no regression)
### P1-2: Strict mode for "fallback 0"
- File: `src/llvm_py/phi_wiring/wiring.py::wire_incomings`
- Behavior: Strict mode forbids silent fallback to 0 (2 locations)
- Location 1: Unresolvable incoming value
- Location 2: Type coercion failure
- Error messages point to next debug file: `llvm_builder.py::_value_at_end_i64`
### P1-3: Connect verify_phi_ordering() to execution path
- File: `src/llvm_py/builders/function_lower.py`
- Behavior: Verify PHI ordering after all instructions emitted
- Debug mode: Shows "✅ All N blocks have correct PHI ordering"
- Strict mode: Raises RuntimeError with block list if violations found
## Testing
✅ Test 1: strict=OFF - passes without errors
✅ Test 2: strict=ON - passes without errors (no violations in test fixtures)
✅ Test 3: debug mode - verify_phi_ordering() connected and running
## Scope
- LLVM harness (Python) changes only
- No new environment variables (uses existing 3 from Phase 277 P2)
- No JoinIR/Rust changes (root fix is Phase 279)
- Default behavior unchanged (strict mode opt-in)
## Next Steps
- Phase 278: Remove deprecated env var support
- Phase 279: Root fix - unify "2本のコンパイラ" pipelines
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Pattern8 (Boolean Predicate Scan) implementation for is_integer/1:
- New pattern detection for `loop + if not predicate() { return false }`
- JoinIR lowerer with main/loop_step/k_exit structure
- Me receiver passed as param (by-name 禁止)
Key fixes:
1. expr_result = Some(join_exit_value) (Pattern7 style)
2. Tail-call: dst: None (no extra Ret instruction)
3. instruction_rewriter: Add `&& is_loop_header_with_phi` check
- Pattern8 has no carriers → no PHIs → MUST generate Copy bindings
- Without this, ValueId(103/104/105) were undefined
Status: Copy instructions now generated correctly, but exit block
creation issue remains (next step: Step A-C in指示書).
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
**Status**: Core carrier PHI issue partially resolved, debugging loop body
**Progress**:
✅ Task 1: split_scan_minimal.rs Carriers-First ordering (6 locations)
✅ Task 2: pattern7_split_scan.rs boundary configuration (host/join inputs, exit_bindings, expr_result)
✅ Result now flows from k_exit to post-loop code (RC issue resolved)
⚠️ Loop body instruction execution needs review
**Key Fixes**:
1. Fixed host_inputs/join_inputs to match main() params Carriers-First order
2. Added result to exit_bindings (CarrierRole::LoopState)
3. Added result back to loop_invariants for variable initialization
4. Added expr_result=join_exit_value_result for loop expression return
5. Fixed jump args to k_exit to include all 4 params [i, start, result, s]
**Current Issue**:
- Loop body type errors resolved (String vs Integer fixed)
- New issue: Loop body computations (sep_len) undefined in certain blocks
- Likely cause: JoinIR→MIR conversion of local variables needs review
**Next Steps**:
- Review JoinValueSpace allocation and ValueId mapping in conversion
- Verify loop_step instruction ordering and block structure
- May need to refactor bound computation or revisit split algorithm
🤖 Generated with Claude Code
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
SSOT principle: Pass canonicalizer-derived ConditionalStep info to Pattern2 lowerer
without re-detecting from AST.
Changes:
- router.rs: Add skeleton: Option<&'a LoopSkeleton> to LoopPatternContext
- parity_checker.rs: Return (Result, Option<LoopSkeleton>) to reuse skeleton
- routing.rs: Pass skeleton to context when joinir_dev_enabled()
- pattern2_with_break.rs: Detect ConditionalStep in can_lower()
Next: P0-3 implements actual JoinIR generation for ConditionalStep.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Consolidates duplicate pattern detection logic across two routing layers.
## Changes
1. **Unified Detection Documentation**:
- Added Phase 183 comments to `loop_pattern_detection::classify()`
- Documented that this is the single source of truth for pattern classification
- Both routers now reference this centralized function
2. **Router Documentation Updates**:
- `patterns/router.rs`: Added Phase 183 comments explaining structure-based routing
- `loop_pattern_router.rs`: Added unified detection section
- Both routers now explicitly reference shared detection logic
3. **Improved Debug Output**:
- Added `pattern_kind` to debug message in `route_loop_pattern()`
- Helps diagnose pattern matching failures
## Benefits
- **Single source of truth**: Pattern classification logic in one place
- **Consistency**: Both routers use same detection algorithm
- **Maintainability**: Changes to classification rules only needed once
- **Documentation**: Clear references between routers and detection module
## Testing
✅ All loop_pattern_detection tests pass
✅ Pattern 2 tests pass
✅ No behavioral changes, pure documentation/organization refactoring
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
