Compiler optimizations

Optimizing compiler

In computing, an optimizing compiler is a compiler that tries to minimize or maximize some attributes of an executable computer program. Common requirements are to minimize a program's execution time, memory footprint, storage size, and power consumption (the last three being popular for portable computers). Compiler optimization is generally implemented using a sequence of optimizing transformations, algorithms which take a program and transform it to produce a semantically equivalent output program that uses fewer resources or executes faster. It has been shown that some code optimization problems are NP-complete, or even undecidable. In practice, factors such as the programmer's willingness to wait for the compiler to complete its task place upper limits on the optimizations that a compiler might provide. Optimization is generally a very CPU- and memory-intensive process. In the past, computer memory limitations were also a major factor in limiting which optimizations could be performed. Because of these factors, optimization rarely produces "optimal" output in any sense, and in fact, an "optimization" may impede performance in some cases. Rather, they are heuristic methods for improving resource usage in typical programs. (Wikipedia).

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Related pages

Dead-code elimination | Live-variable analysis | Constant folding | Rematerialization | Chaitin's algorithm | Undecidable problem | Loop unrolling | Loop nest optimization | Control-flow graph | Object code optimizer | Instruction scheduling | Pointer (computer programming) | Lazy evaluation | Common subexpression elimination | Register allocation | Clang | Automatic parallelization | Profile-guided optimization | Arithmetic logic unit | Strength reduction | Software pipelining | Inline expansion | Use-define chain | Escape analysis | LLVM | Jump threading | Interprocedural optimization | Floating-point unit | Array-access analysis | Deforestation (computer science) | Data-flow analysis | Partial evaluation | Loop interchange | Loop unswitching | Loop-invariant code motion | Loop optimization | Partial-redundancy elimination | Available expression | Loop invariant | Tail recursion | Loop inversion | Loop splitting | Pointer analysis | Iteration | Sparse conditional constant propagation | Peephole optimization | Full-employment theorem | Dataflow | Compile-time function execution | Control flow analysis | Dead store | Dependence analysis | Call graph | Alias analysis | Bounds-checking elimination | Algorithmic efficiency | Instruction selection