Mention The Issues To Be Considered While Applying The Techniques For Code Optimization
The semantic equivalence of the source program must not be changed. The improvement over the program efficiency must be achieved without changing the algorithm of the program. The machine dependent optimization is based on the characteristics of the target machine for the instruction set used and addressing modes used for the instructions to produce the efficient target code. The machine independent optimization is based on the characteristics of the programming languages for appropriate programming structure and usage of efficient arithmetic properties in order to reduce the execution time. Available expressions. Reaching definitions. Live variables. Busy variables.
