[all-commits] [llvm/llvm-project] d5ab37: AMDGPU: Add baseline test for broken machine sinking

[Matt Arsenault via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d5ab379506252f4955c74841f1e12caa97317a57
      https://github.com/llvm/llvm-project/commit/d5ab379506252f4955c74841f1e12caa97317a57
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2023-07-18 (Tue, 18 Jul 2023)

  Changed paths:
    A llvm/test/CodeGen/AMDGPU/machine-sink-loop-var-out-of-divergent-loop-swdev407790.ll
    A llvm/test/CodeGen/AMDGPU/machine-sink-loop-var-out-of-divergent-loop-swdev407790.mir
    M llvm/test/CodeGen/AMDGPU/sink-after-control-flow-postra.mir

  Log Message:
  -----------
  AMDGPU: Add baseline test for broken machine sinking


  Commit: 3f8ef57bede94445b1a1042c987cc914a886e7ff
      https://github.com/llvm/llvm-project/commit/3f8ef57bede94445b1a1042c987cc914a886e7ff
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2023-07-18 (Tue, 18 Jul 2023)

  Changed paths:
    M llvm/lib/CodeGen/MachineSink.cpp
    M llvm/test/CodeGen/AMDGPU/machine-sink-loop-var-out-of-divergent-loop-swdev407790.ll
    M llvm/test/CodeGen/AMDGPU/machine-sink-loop-var-out-of-divergent-loop-swdev407790.mir
    M llvm/test/CodeGen/AMDGPU/sink-after-control-flow.mir

  Log Message:
  -----------
  MachineSink: Fix sinking VGPR def out of a divergent loop

This fixes sinking a VGPR def out of a loop past the reconvergence
point at the SI_END_CF. There was a prior fix which introduced
blockPrologueInterferes (D121277) to fix the same basic problem for
the post RA sink. This also had the special case isIgnorableUse case
which was incorrect, because in some contexts the exec use is not
ignorable.

I'm thinking about a new way to represent this which will avoid
needing hasIgnorableUse and isBasicBlockPrologue, which would function
more like the exception handling.

Fixes: SWDEV-407790

https://reviews.llvm.org/D155343


Compare: https://github.com/llvm/llvm-project/compare/7be7f232699f...3f8ef57bede9