forwprop: Simplify long_mul_summand initialization
Refactors `long_mul_summand` in `tree-ssa-forwprop.cc` for cleaner initialization and state management.
This commit refactors the long_mul_summand structure within GCC’s forward propagation pass. It moves classification logic into the constructor, simplifying initialization and ensuring that classification only occurs when a long_mul_summand object is created. Additionally, an operator bool is introduced to easily check for valid classifications, leading to cleaner code.
In Details
The tree-ssa-forwprop.cc file contains logic for the SSA-based forward propagation optimization pass. This change restructures the long_mul_summand class, consolidating its classification methods into its constructor and making them private. This improves encapsulation and guarantees that the classification state is always valid upon object creation. The addition of operator bool provides a more idiomatic way to check the validity of the classified summand.
- tree-ssa-forwprop
- A GCC optimization pass that performs forward propagation on Static Single Assignment (SSA) form. It aims to move computations closer to their uses to enable further optimizations.
- SSA
- Static Single Assignment form. An intermediate representation where every variable is assigned a value only once, simplifying many data-flow analyses and optimizations.
- forward propagation
- An optimization technique where computations are moved from later in the program to earlier, or from uses to definitions, to expose more optimization opportunities.
- long_mul_summand
- A data structure likely used within the forward propagation pass to represent components or operands involved in a multiplication operation, possibly for specialized optimization.
- constructor
- A special method in object-oriented programming that is automatically called when an object of a class is created. It is used to initialize the object's state.