Contents
What are the principal sources of optimization?
The Principal Sources of Optimization
- Causes of Redundancy.
- A Running Example: Quicksort.
- Semantics-Preserving Transformations.
- Global Common Subexpressions.
- Copy Propagation.
- Dead-Code Elimination.
- Code Motion.
- Induction Variables and Reduction in Strength.
What is source code optimization?
Source code optimization is a process which enhances a program’s source code, in order to obtain a functionally equivalent program, i.e., a program which computes the same solution for the same problem but, possesses better non-functional aspects.
What are the principal sources of optimization in compiler design?
Three techniques are important for loop optimization: Ø Code motion, which moves code outside a loop; Ø Induction-variable elimination, which we apply to replace variables from inner loop. Ø Reduction in strength, which replaces and expensive operation by a cheaper one, such as a multiplication by an addition.
How is machine independent optimization used in compiler?
Machine Independent Optimization – This code optimization phase attempts to improve the intermediate code to get a better target code as the output. The part of the intermediate code which is transformed here does not involve any CPU registers or absolute memory locations.
Which is the best description of code optimization?
Code Optimization | Code Optimization Techniques. Description. In Compiler design, Code Optimization is an approach for enhancing the performance of the code. Various Code optimization techniques are- Compile Time Evaluation, Common Sub expression elimination, Code movement, Dead code elimination, Strength reduction.
Which is an example of machine dependent optimization?
For example: This code involves repeated assignment of the identifier item, which if we put this way: should not only save the CPU cycles, but can be used on any processor. Machine-dependent optimization is done after the target code has been generated and when the code is transformed according to the target machine architecture.
How are compilers used to optimize source code?
Optimizing the source program involves making changes to the algorithm or changing the loop structures.User is the actor here. Optimizing the intermediate code involves changing the address calculations and transforming the procedure calls involved. Here compiler is the actor.