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・ Induction hardening
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Induction variable
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Induction variable : ウィキペディア英語版
Induction variable
In computer science, an induction variable is a variable that gets increased or decreased by a fixed amount on every iteration of a loop, or is a linear function of another induction variable.
For example, in the following loop, i and j are induction variables:

for (i=0; i < 10; ++i)

==Application to strength reduction==
A common compiler optimization is to recognize the existence of induction variables and replace them with simpler computations; for example, the code above could be rewritten by the compiler as follows, on the assumption that the addition of a constant will be cheaper than a multiplication.

j = -17;
for (i = 0; i < 10; ++i)

This optimization is a special case of strength reduction.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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