Variable Propagation
Variable propagation is one of the internal processes of analyzing the flow of variables throughout the code enabling the optimizer to do the optimizations. In broader terms, It is an analysis of the flow of variables throughout the code about how and what variables are assigned, modified and what variables are used what variables are declared but not used in computations, what code is redundant, and which variables can be replaced, so that the optimizer can perform optimizations like constant propagation, constant folding etc., in the code. Variable propagation is done before actually modifying the code by the optimizer.
What is Variable Propagation?
In the compilation process, after generating the Intermediate code, the Compiler does code optimization to improve the performance of the code. So, before actually modifying the code for optimization, the compiler analyses the flow of variables in the code, that is compiler analyzes the code and variables, and based upon this analysis, the optimizer component of the compiler does code optimization. This analysis of the flow of variables throughout the code by the compiler is called variable propagation.
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