Introduction to Code Optimization - Deepening Efficiency
Code optimization is a critical phase in the compiler pipeline that transforms intermediate code to improve performance while preserving program semantics. Key optimization goals include enhancing execution speed, reducing resource usage, and conserving energy. This module focuses on Control Flow Graphs (CFG) as the backbone for optimizations and examines various local optimization techniques, such as Common Subexpression Elimination, Copy Propagation, and Dead Code Elimination, which improve code quality by eliminating redundancies.
Sections
Navigate through the learning materials and practice exercises.
What we have learnt
- Code optimization transforms intermediate code for better performance while ensuring the same output as the original program.
- Control Flow Graphs (CFGs) visually represent execution paths, which are essential for identifying optimization opportunities.
- Local optimizations can significantly enhance efficiency without altering program behavior, and they often operate synergistically.
Key Concepts
- -- Code Optimization
- The process of applying transformations to intermediate code to produce a more efficient equivalent program.
- -- Control Flow Graph (CFG)
- A directed graph representation of all possible execution paths in a program, where nodes denote basic blocks and edges represent control transfers.
- -- Basic Block
- A sequence of instructions in a program with a single entry and exit point, executing sequentially without internal branches.
- -- Common Subexpression Elimination (CSE)
- An optimization technique that identifies and removes redundant computations of the same subexpression within a basic block.
- -- Copy Propagation
- An optimization that eliminates unnecessary copy statements in a block by replacing their uses with the original value.
- -- Dead Code Elimination (DCE)
- The process of removing code that does not affect the observable output of a program, thereby simplifying the codebase.
Additional Learning Materials
Supplementary resources to enhance your learning experience.