[PATCH] D75438: [BranchAlign] Reduce the number of emitted fragments due to branch align

[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.

Currently, a BoundaryAlign fragment will be inserted before the
instruction that is not macro fused but valid as the first instruction in a
fused pair, this fragment is excessive. In addition, a BoundaryAlign
fragment may be inserted after the branch that needs to be aligned to
truncate the current fragment, this fragment is also excessive.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D75438

Files:
  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-64-negative.s

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