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Amara Emerson e3c37200f9 [AArch64][GlobalISel] Make G_SEXT_INREG legal and add selection support.
We were defaulting to the lower action for this, resulting in SHL+ASHR
sequences. On AArch64 we can do this in one instruction for an arbitrary
extension using SBFM as we do for G_SEXT.

Differential Revision: https://reviews.llvm.org/D81992
2020-06-19 13:20:41 -07:00
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