Enable ranger in Gimple instruction selection.
Activate range-based folding in the Gimple instruction selector.
This commit enables the ‘ranger’ functionality within GCC’s Gimple instruction selection (gimple-isel) pass. Ranger is a component that facilitates certain types of range-based optimizations and foldings. By enabling it, the compiler can now perform more aggressive optimizations during instruction selection, potentially leading to more efficient machine code. The ranger is enabled and disabled on a per-function basis within the execute method of the pass_gimple_isel pass.
In Details
This change modifies gcc/gimple-isel.cc by enabling the ranger pass within the pass_gimple_isel::execute function. The ranger is a component that provides information about the possible ranges of values for variables. Enabling it allows the instruction selector (isel) to perform foldings and optimizations that depend on these range analyses. This is typically done to enable optimizations that might otherwise be missed if range information is not readily available during instruction selection.
- Gimple
- GCC's Internal Representation (IR) used after the language front-end has parsed the code and performed initial optimizations. It is a three-address representation based on GENERIC.
- isel
- Instruction Selection. A compiler optimization pass responsible for mapping intermediate representation (IR) operations to target-specific machine instructions.
- Ranger
- A GCC optimization component that performs analysis on the possible range of values for variables. This information can be used by other optimization passes, such as instruction selection, to perform more effective transformations.
- Folding
- An optimization technique where constant expressions or predictable computations are evaluated at compile time, replacing the expression with its result.