[PATCH] D75300: [POC] Demonstrate prefix padding on top of D75203

[Philip Reames via Phabricator via llvm-commits]

reames created this revision.
Herald added subscribers: llvm-commits, bollu, hiraditya, mcrosier.
Herald added a project: LLVM.
reames added a parent revision: D75203: Relax existing instructions to reduce the number of nops needed for alignment purposes.

This is just a proof of concept at the moment, not a real reviewable patch.  It has lots of copy pasted code.  The existing branch alignment tests haven't been updated and fail due to a mix of correct and incorrect encoding changes (see todo in code).


https://reviews.llvm.org/D75300

Files:
  llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
  llvm/test/MC/X86/align-via-relaxation.s

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