[PATCH] D72225: Align branches within 32-Byte boundary(Prefix padding)

[Kan Shengchen via Phabricator via llvm-commits]

skan created this revision.
skan added reviewers: annita.zhang, LuoYuanke, craig.topper, jyknight, reames, MaskRay.
Herald added subscribers: llvm-commits, hiraditya.
Herald added a project: LLVM.
skan added a parent revision: D72047:  Add an interface emitPrefix for MCCodeEmitter.

1. First we try to add segment prefixes to instructions before a branch.
2. If there is no sufficient room to add segment prefixes, NOP will be inserted before a branch.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D72225

Files:
  llvm/include/llvm/MC/MCAsmBackend.h
  llvm/include/llvm/MC/MCFragment.h
  llvm/include/llvm/MC/MCObjectStreamer.h
  llvm/lib/MC/MCAssembler.cpp
  llvm/lib/MC/MCFragment.cpp
  llvm/lib/MC/MCObjectStreamer.cpp
  llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
  llvm/test/MC/X86/align-branch-32-1a.s
  llvm/test/MC/X86/align-branch-32-2a.s
  llvm/test/MC/X86/align-branch-32-3a.s
  llvm/test/MC/X86/align-branch-32-4a.s
  llvm/test/MC/X86/align-branch-64-1e.s
  llvm/test/MC/X86/align-branch-64-2d.s
  llvm/test/MC/X86/align-branch-64-7a.s

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