[PATCH] D136672: [ExpandMemCmp][AArch64] Add a new option PreferCmpToExpand in inMemCmpExpansionOptions and enable or AArch64

[chenglin.bi via Phabricator via llvm-commits]

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Current code use xor+or pattern to expand memcmp, but it is not efficient on AArch64.
This patch adds a new option PreferCmpToExpand, use cmp+or pattern to expand.

Fix: #56543


https://reviews.llvm.org/D136672

Files:
  llvm/include/llvm/Analysis/TargetTransformInfo.h
  llvm/lib/CodeGen/ExpandMemCmp.cpp
  llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
  llvm/test/CodeGen/AArch64/bcmp-inline-small.ll
  llvm/test/CodeGen/AArch64/bcmp.ll

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