[llvm] [InstCombine] Fold trunc(lshr(add(shl(X, ShAmt), C), ShrAmt)) (PR #214562)

[Andreas Jonson via llvm-commits]

andjo403 wrote:

to me it feels better to have it in `SimplifyDemandedUseBits` as it covers more cases for the same amount of code

https://github.com/llvm/llvm-project/pull/214562