SSA/IR Design Skill

Overview

Expert skill for designing intermediate representations and implementing SSA (Static Single Assignment) construction.

Capabilities

• Design control flow graph (CFG) structures
• Implement dominance tree computation
• Implement SSA construction algorithms (Cytron et al.)
• Design phi function placement and pruning
• Implement SSA destruction for register allocation
• Design sea-of-nodes IR representations
• Implement basic block reordering
• Design IR verification passes

Target Processes

• ir-design.js
• code-generation-llvm.js
• jit-compiler-development.js
• semantic-analysis.js

Dependencies

Compiler optimization textbooks (Engineering a Compiler, Modern Compiler Implementation)

Usage Guidelines

1. CFG Design: Start with a clear CFG representation with explicit entry/exit blocks
2. Dominance: Implement dominance computation before SSA construction
3. Phi Placement: Use dominance frontiers for minimal phi placement
4. Verification: Build IR verification passes to catch malformed IR early
5. Debugging: Include IR pretty-printing from the start for debugging

Output Schema

{
  "type": "object",
  "properties": {
    "irStyle": {
      "type": "string",
      "enum": ["basic-blocks", "sea-of-nodes", "continuation-passing"]
    },
    "ssaConstruction": {
      "type": "string",
      "enum": ["cytron", "braun", "sreedhar"]
    },
    "passes": {
      "type": "array",
      "items": { "type": "string" }
    },
    "generatedFiles": {
      "type": "array",
      "items": { "type": "string" }
    }
  }
}