[PATCH] D75357: [X86] Add a local function DeterminePaddingPrefix for X86AsmBackend

[Kan Shengchen via Phabricator via llvm-commits]

skan created this revision.
skan added reviewers: annita.zhang, reames, MaskRay, craig.topper, LuoYuanke, jyknight.
Herald added a project: LLVM.

X86 can reduce the bytes of NOP by padding instructions with prefixes to get a better peformance in some cases. So a local function `DeterminePaddingPrefix` is added to determine which prefix is the most suitable.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D75357

Files:
  llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
  llvm/lib/Target/X86/MCTargetDesc/X86BaseInfo.h

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