It is interesting to note that 4-tuple 11 is found out to be same as 4-tuple 3, even though the variable
names were different.
The above method can be further developed to be able to handle array references and data structures.
Further, such methods, which do local analysis limited to a Basic Block, can be modified to provide
useful information for global analysis.
10.3 Peep-hole Optimization
This kind of optimization is done by one or more passes over the entire IR, in a linear fashion. Such
methods are called peep-hole optimization because it inspects and manipulates a small portion of the
IR at a time, ...
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