This commit introduces several improvements to the AST optimizer and
dead code elimination (DCE) logic:
- **Address Mapping:** The `Get` and `Set` operations now correctly map
local slots and global indices using the substitution map, ensuring
that remapped variables are handled properly.
- **Parameter Slot Mapping:** Parameters are now explicitly mapped to
their correct slots within the `Lambda` node, preventing potential
slot reassignments in the function body.
- **Pure Function Analysis:** The `is_pure` function has been refined to
accurately identify pure expressions, including calls to pure
functions and stateless closures.
- **Dead Code Elimination:** DCE logic in `BoundKind::Block` has been
enhanced to remove unused local definitions and pure, non-essential
expressions more effectively. Global DCE is also improved.
- **Constant Folding:** `try_fold_pure` is now more robust in folding
pure function calls with constant arguments, reducing redundant
computations.
- **Beta Reduction:** `try_beta_reduce` has been updated to avoid
reducing if the body contains `DefLocal`, ensuring correctness.
- **Global Purity Tracking:** A `global_purity` map is introduced to
track the purity of global values, enabling better optimization of
global accesses.
- **Inlinable Value Check:** The `is_inlinable_value` check now
correctly identifies stateless closures for inlining.
- **Optimization Level:** The default `optimization_level` is set to 2
to enable more aggressive optimizations.
Michael Schimmel
e87f7232e6