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Loop-invariant code motion
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<p>In <a href="/facts/Computer_programming/QmSsFnu0">computer programming</a>, <a href="/facts/Loop-invariant_code/fIbNgcsI">loop-invariant code</a> consists of statements or expressions that can be moved outside the body of a loop without affecting the semantics of the program. Loop-invariant code motion (also called hoisting or scalar promotion) is a <a href="/facts/Compiler_optimization/JXnv4LUd">compiler optimization</a> that performs this movement automatically. </p>