[all-commits] [llvm/llvm-project] 4bbcbd: [AMDGPU] Unify divergent nodes if the PostDom tree...

[Anshil Gandhi via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4bbcbdaee5c937b17baaf04357383c8b15d408f2
      https://github.com/llvm/llvm-project/commit/4bbcbdaee5c937b17baaf04357383c8b15d408f2
  Author: Anshil Gandhi <gandhi21299 at gmail.com>
  Date:   2023-01-04 (Wed, 04 Jan 2023)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUUnifyDivergentExitNodes.cpp
    M llvm/test/CodeGen/AMDGPU/agpr-copy-no-free-registers.ll
    M llvm/test/CodeGen/AMDGPU/branch-relaxation.ll
    M llvm/test/CodeGen/AMDGPU/cf-loop-on-constant.ll
    M llvm/test/CodeGen/AMDGPU/control-flow-optnone.ll
    M llvm/test/CodeGen/AMDGPU/infinite-loop.ll
    M llvm/test/CodeGen/AMDGPU/kill-infinite-loop.ll
    M llvm/test/CodeGen/AMDGPU/loop-live-out-copy-undef-subrange.ll
    M llvm/test/CodeGen/AMDGPU/optimize-negated-cond.ll
    A llvm/test/CodeGen/AMDGPU/si-annotate-nested-control-flows.ll
    M llvm/test/CodeGen/AMDGPU/unstructured-cfg-def-use-issue.ll
    M llvm/test/CodeGen/AMDGPU/vgpr-descriptor-waterfall-loop-idom-update.ll
    M llvm/test/Transforms/LoopStrengthReduce/AMDGPU/different-addrspace-crash.ll

  Log Message:
  -----------
  [AMDGPU] Unify divergent nodes if the PostDom tree has one root

This patch allows AMDGPUUnifyDivergenceExitNodes pass
to transform a function whose PDT has exactly one root
and ends in a branch instruction. Fixes
https://github.com/llvm/llvm-project/issues/58861.

Reviewed By: ruiling, arsenm

Differential Revision: https://reviews.llvm.org/D139780