= Common subexpression elimination
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= CSE
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{synonym}
A transformation that computes a repeated <program expression> once and reuses its saved result when the value is known not to have changed. A repeated load can be reused only when intervening stores, calls or other changes cannot alter the relevant location. <Alias analysis> helps establish that fact. Maximal address sharing can be counterproductive if <instruction selection> could otherwise fold an address <addition> into <register-offset addressing>.
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