because on most processors, loading a constant in a variable is faster than loading a value from the
memory. The method saves Time, but may also save Space if the constants are small.
Multiplication or Division by 1 and Addition or Subtraction of 0 can be completely eliminated.
10.3.4 Dead Variable and Dead Code Elimination
Some portion of the code may not have any chance of having any effect of the result to be computed.
This portion of the code is called Dead code.
Dead Variable
If a variable is declared and initialized, but later in the code it does not appear in any RHS of an
assignment, as a function ...
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