Application To Reduce Register Pressure
In some cases, it is possible to reverse this optimization in order to remove an induction variable from the code entirely. For example:
extern int sum; int foo(int n) { int i, j; j = 5; for (i=0; i < n; ++i) { j += 2; sum += j; } return sum; }This function's loop has two induction variables: i and j. Either one can be rewritten as a linear function of the other; therefore, the compiler may optimize this code as if it had been written
Read more about this topic: Induction Variable
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