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803a603e69
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feat(joinir): Phase 217 Multi-carrier if-sum complete (zero impl!)
Completes Phase 217: Validates Pattern 3 multi-carrier if-sum support
with **ZERO additional code** - Phase 195/214/215 boxes compose perfectly.
## The Surprise
Expected: Modify lowerers for multi-carrier support
Actual: Everything just works out-of-the-box! 🎉
## Test Results (All Passing)
### Primary Target
- phase217_if_sum_multi_min.hako: RC=2 ✅
- Carriers: sum + count (2 accumulators)
- Loop: i=0..2, both increment when i>0
- Returns sum=2
### Regression Tests
- loop_if_phi.hako (P3, 1 carrier): RC=2 ✅
- phase212_if_sum_min.hako (P3, 1 carrier): RC=2 ✅
- loop_min_while.hako (P1): RC=2 ✅
## Why It Just Worked
Box composition from previous phases:
**Phase 195 (Multi-Carrier PHI Box)**:
- CarrierInfo tracks N carriers automatically
- Exit PHI generation handles arbitrary count
- ExitLineReconnector updates variable_map for all
**Phase 214 (Dynamic Inputs Box)**:
- Removed hardcoded 3-input assumption
- `join_inputs = (0..total_inputs).map(ValueId)`
- Auto-scales: 1 loop_var + N carriers = N+1 inputs
**Phase 215 (ExprResult Contract Box)**:
- Marks first carrier as expr_result
- Propagates through Boundary → ExitLine → Return
- Works regardless of carrier count
Result: Boxes A + B + C = Multi-carrier support (no glue code!)
## Architecture Verification
Dynamic scaling confirmed:
```rust
// Automatic for 2 carriers (sum, count)
total_inputs = 1 + 2 = 3
join_inputs = [ValueId(0), ValueId(1), ValueId(2)]
host_inputs = [loop_var_id, sum_binding, count_binding]
```
Exit PHI generation:
```
Loop Header:
%i_phi = phi [0, entry], [%i_next, back]
%sum_phi = phi [0, entry], [%sum_exit, back] ← Carrier 1
%count_phi = phi [0, entry], [%count_exit, back] ← Carrier 2
```
## Box Theory Validation
**「箱理論」の勝利！**
Well-designed boxes compose without modification:
- Each box has single responsibility
- Clear contracts between boxes
- No tight coupling
- New capabilities emerge from composition
Phase 217 proves this philosophy works in practice.
## Documentation
- Added: docs/development/current/main/phase217-if-sum-multi.md
- Added: apps/tests/phase217_if_sum_multi_min.hako (test case)
- Updated: CURRENT_TASK.md (Phase 217 complete status)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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2025-12-10 01:53:06 +09:00 |
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