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Commit de7881eb authored by Noah Goldstein's avatar Noah Goldstein
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[DAGCombiner] Combine `(select c, (and X, 1), 0)` -> `(and (zext c), X)` 

The middle end canonicalizes:
`(and (zext c), X)`
    -> `(select c, (and X, 1), 0)`

But the `and` + `zext` form gets better codegen.
parent e3e9c940
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