[all-commits] [llvm/llvm-project] 66fe60: AMDGPU/GlobalISel: Fix masked control flow with fa...

[Matt Arsenault via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 66fe60220ca2b1932e06093294c72b246be54ec8
      https://github.com/llvm/llvm-project/commit/66fe60220ca2b1932e06093294c72b246be54ec8
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2020-05-22 (Fri, 22 May 2020)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
    M llvm/lib/Target/AMDGPU/SIISelLowering.cpp
    M llvm/test/CodeGen/AMDGPU/GlobalISel/divergent-control-flow.ll
    A llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-amdgcn.if.xfail.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-brcond.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/localizer.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/udiv.i64.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/urem.i64.ll

  Log Message:
  -----------
  AMDGPU/GlobalISel: Fix masked control flow with fallthrough blocks

Unlike SelectionDAGBuilder, IRTranslator omits the unconditional
branch in fallthrough cases. Confusingly, the control flow pseudos
function in the opposite way the intrinsics are used, and the branch
targets always need to be swapped. We're inverting the target blocks,
so we need to figure out the old fallthrough block and insert a branch
to the original unconditional branch target.