[PATCH] D101107: [AIX][Power10] Restrict prefixed instructions from crossing the 64byte boundary

[Victor Huang via Phabricator via llvm-commits]

NeHuang created this revision.
NeHuang added reviewers: stefanp, nemanjai.
Herald added subscribers: dexonsmith, steven.zhang, kbarton, hiraditya, mgorny.
NeHuang requested review of this revision.
Herald added a project: LLVM.

This patch adds the support to restrict prefixed instruction from
crossing the 64 byte boundary:

- Add the infrastructure to register a custom XCOFF streamer
- Add a custom XCOFF streamer for PowerPC to allow us to intercept instructions as they are being emitted and align all 8 byte instructions to a 64 byte boundary if required by adding a 4 byte nop.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D101107

Files:
  llvm/include/llvm/Support/TargetRegistry.h
  llvm/lib/Target/PowerPC/MCTargetDesc/CMakeLists.txt
  llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
  llvm/lib/Target/PowerPC/MCTargetDesc/PPCXCOFFStreamer.cpp
  llvm/lib/Target/PowerPC/MCTargetDesc/PPCXCOFFStreamer.h
  llvm/test/CodeGen/PowerPC/aix-prefixed-instruction-boundary.mir

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