SUNDAY, AUGUST 2, 2026
match
match: Combine two patterns into one for.
Reduces generated C++ code size by merging two genmatch patterns into one.
This change consolidates two patterns within the genmatch utility into a single pattern. The goal is to reduce the amount of C++ code generated by genmatch, which can lead to smaller compiler binaries and potentially faster compilation times.
In Details
The match.pd file defines patterns used by genmatch to generate C++ code for pattern matching. This commit combines two existing for loops within these patterns into a single for loop. This optimization reduces the size of the generated C++ code, simplifying the output of genmatch and contributing to overall compiler size reduction.
For Context
- genmatch
- A utility within GCC that generates C++ code for pattern matching. It takes pattern definitions and produces efficient code to check for those patterns, often used in compiler passes.
- Pattern matching
- A technique used in programming languages and compilers to check if a given data structure or sequence conforms to a specific structure, and to extract parts of it if it does. Crucial for compiler optimizations and transformations.
- C++ code generation
- The process by which the compiler translates internal representations of code into C++ source code, which is then further processed. In this case,
genmatchgenerates C++ code for its own pattern-matching logic.