Path ranger checks root ranger equivalencies
Path ranger now queries the root ranger for equivalencies which can improve optimization by considering more relationships between values.
The path ranger optimization pass has been enhanced to also query the root ranger for equivalencies and relations between names that appear earlier in the Intermediate Language (IL). This broader check improves the effectiveness of the path ranger by considering a wider set of value relationships, potentially leading to better optimizations.
In Details
The path_oracle::query in value-relation.cc now consults the root oracle for equivalencies beyond just local ones. This ensures that the path ranger considers all potentially relevant value equivalencies and relations earlier in the IL, addressing PR tree-optimization/125986.
- path ranger
- A compiler optimization pass that analyzes the relationships and equivalencies between values along different execution paths to enable further optimizations.
- root ranger
- A component within the compiler's optimization infrastructure that maintains and queries for equivalencies and relations between variables or expressions.
- equivalencies
- In compiler optimization, this refers to situations where two different expressions or variables are known to hold the same value or represent the same memory location.
- Intermediate Language (IL)
- An internal representation of the program, between the source code and the target machine code, used by the compiler for analysis and transformation.
- PR tree-optimization/125986
- A bug report targeting the tree optimization stage of the compiler, specifically related to the path ranger's analysis of value equivalencies.