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Commit 5a3d9e06 authored by Noah Goldstein's avatar Noah Goldstein
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[InstCombine] Transform `(shift X,Or(Y,BitWidth-1))` -> `(shift X,BitWidth-1)` 

shl : https://alive2.llvm.org/ce/z/_B7Qca
lshr: https://alive2.llvm.org/ce/z/6eXz_W
ashr: https://alive2.llvm.org/ce/z/oGEx-q

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D145326
parent 9bb409ff
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