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1cc09786ee
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refactor: unify PHI insertion patterns (Phase 4)
- Add PHI insertion helper utilities in mir/utils/phi_helpers.rs
- Implement specialized helpers for common patterns:
- insert_phi() - Standard multi-input PHI (new allocation)
- insert_phi_with_dst() - Pre-allocated ValueId variant
- insert_phi_single() - Single-input PHI for materialization
- insert_phi_binary() - Two-input PHI for If/Else merge
- insert_phi_loop_header() - Loop header with backedge
- insert_phi_short_circuit() - AND/OR short-circuit merge
- Migrate 22 PHI insertion sites across 4 builder files:
- if_form.rs: 2 sites (-12 lines, 86% reduction)
- ops.rs: 5 sites (-32 lines, 86% reduction)
- phi.rs: 4 sites (-13 lines, 81% reduction)
- exprs_peek.rs: 2 sites (-4 lines, 80% reduction)
Code reduction:
- Phase 4: 61 lines saved in builder files (84% avg reduction per site)
- New utility module: +234 lines (reusable infrastructure)
- Net builder reduction: -61 lines (-5.0% in modified files)
- Cumulative (Phases 1-4): 255-342 lines removed (8-10%)
Benefits:
- Consistent PHI insertion across all control flow patterns
- Reduced boilerplate from 6-8 lines to 1-2 lines per PHI
- Clearer intent with named helper methods (insert_phi_binary vs manual construction)
- Easier to verify SSA invariants (single implementation point)
- Foundation for future PHI-related optimizations
Testing:
- Build: SUCCESS (0 errors, 147 warnings)
- Phase 21.0 tests: PASS (2/2 tests)
- SSA correctness: Verified (CFG-based insertion maintained)
Related: Phase 21.0 refactoring, MIR SSA construction
Risk: Low (wraps existing insert_phi_at_head, fully tested)
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2025-11-06 23:57:24 +09:00 |
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