[PATCH] D28522: Codegen: Make chains from lattice-shaped CFGs

[Kyle Butt via Phabricator via llvm-commits]

iteratee updated this revision to Diff 83883.
iteratee added a comment.

Add comments elaborating on why we use a CFG check rather than checking for partial copiability of blocks or keeping a list of blocks with copies.


https://reviews.llvm.org/D28522

Files:
  lib/CodeGen/MachineBlockPlacement.cpp
  test/CodeGen/AArch64/branch-relax-cbz.ll
  test/CodeGen/AArch64/optimize-cond-branch.ll
  test/CodeGen/AMDGPU/basic-branch.ll
  test/CodeGen/AMDGPU/cf-loop-on-constant.ll
  test/CodeGen/AMDGPU/convergent-inlineasm.ll
  test/CodeGen/AMDGPU/salu-to-valu.ll
  test/CodeGen/AMDGPU/skip-if-dead.ll
  test/CodeGen/ARM/atomic-cmpxchg.ll
  test/CodeGen/ARM/fold-stack-adjust.ll
  test/CodeGen/PowerPC/tail-dup-layout.ll
  test/CodeGen/WebAssembly/mem-intrinsics.ll
  test/CodeGen/X86/block-placement.ll
  test/CodeGen/X86/tail-dup-merge-loop-headers.ll
  test/CodeGen/X86/tail-dup-repeat.ll
  test/CodeGen/X86/tail-opts.ll
  test/CodeGen/X86/twoaddr-coalesce-3.ll

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