[PATCH] D132939: [TwoAddressInstruction] rewrite INSERT_SUBREG to SUBREG_TO_REG if upper bits zero

[Allen zhong via Phabricator via llvm-commits]

Allen added a comment.

In D132939#3758406 <https://reviews.llvm.org/D132939#3758406>, @foad wrote:

> Where do you actually check that the upper bits are zero?

hi @foad , thanks for you attention, maybe I have some misunderstand. I try this refer to **AArch64MIPeepholeOpt::visitORR** in file AArch64MIPeepholeOpt.cpp.


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