[PATCH] D74101: [BPF] implement isTruncateFree and isZExtFree in BPFTargetLowering

[Alexei Starovoitov via Phabricator via llvm-commits]

ast added a comment.

> return NumBits1 > NumBits2

arm64 uses this approach, but arm64 doesn't have 8-bit subregisters and it works ?


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https://reviews.llvm.org/D74101