[llvm] [InstCombine] Fold `lshr -> zext -> shl` patterns (PR #147737)

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Wed Jul 30 08:38:20 PDT 2025

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zGoldthorpe wrote:

@nikic @arsenm @dtcxzyw pinging again to review the refactoring of `canEvaluateShifted` to identify shift amounts that can be simplified.

https://github.com/llvm/llvm-project/pull/147737

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