# Compiler Optimizations - IMPLEMENTED

**Status: ✅ COMPLETE** - All 27 optimizations implemented in `src/semantic_analyzer.py`

These optimizations are used by the z88dk C backend for generating optimized code.

## Implementation

All semantic analysis and optimization passes are implemented in `src/semantic_analyzer.py` (6400+ lines).

## What's Here

### Semantic Analysis & Optimization

**OPTIMIZATION_STATUS.md**
- Complete status of all 27 implemented optimizations
- Each optimization documented with examples and benefits

**SEMANTIC_ANALYSIS_DESIGN.md**
- Design document for the semantic analyzer
- Type inference, constant folding, dead code elimination
- Loop analysis, strength reduction, common subexpression elimination

**SEMANTIC_ANALYZER.md**
- Implementation details for the semantic analyzer
- Symbol tables, type checking, scope analysis

**optimization_guide.md** / **README_OPTIMIZATIONS.md**
- Overview of the optimization suite

### Type System Optimizations

**TYPE_REBINDING_STRATEGY.md** - Variable type change optimization
**TYPE_REBINDING_PHASE2_DESIGN.md** - Type promotion analysis
**TYPE_REBINDING_IMPLEMENTATION_SUMMARY.md** - Implementation summary
**DYNAMIC_TYPE_CHANGE_PROBLEM.md** - BASIC dynamic typing challenges

### Integer Size Optimization

**INTEGER_SIZE_INFERENCE.md** - 8/16/32-bit size optimization
**INTEGER_INFERENCE_STRATEGY.md** - FOR loop and function return analysis

### Iterative Optimization Framework

**ITERATIVE_OPTIMIZATION_STRATEGY.md** - Multi-pass optimization
**ITERATIVE_OPTIMIZATION_IMPLEMENTATION.md** - Convergence detection
**OPTIMIZATION_DATA_STALENESS_ANALYSIS.md** - Invalidation strategies

### Compilation Strategies

**COMPILATION_STRATEGIES_COMPARISON.md** - Approach comparison
**COMPILER_SEMANTIC_ANALYSIS_SESSION.md** - Design session notes

### Runtime System Design

**STRING_ALLOCATION_AND_GARBAGE_COLLECTION.md** - CP/M string memory management

## Implemented Optimizations (27 total)

1. Constant Folding
2. Runtime Constant Propagation
3. Common Subexpression Elimination (CSE)
4. Subroutine Side-Effect Analysis
5. Loop Analysis (FOR, WHILE, IF-GOTO)
6. Loop-Invariant Code Motion
7. Multi-Dimensional Array Flattening
8. OPTION BASE Global Analysis
9. Dead Code Detection
10. Strength Reduction
11. Copy Propagation
12. Algebraic Simplification
13. Induction Variable Optimization
14. Expression Reassociation
15. Boolean Simplification
16. Forward Substitution
17. Branch Optimization
18. Uninitialized Variable Detection
19. Range Analysis
20. Live Variable Analysis
21. String Constant Pooling
22. Built-in Function Purity Analysis
23. Array Bounds Analysis
24. Alias Analysis
25. Available Expression Analysis
26. String Concatenation in Loops Detection
27. Type Rebinding Analysis
