[all-commits] [llvm/llvm-project] a174f0: AMDGPU/GlobalISel: Add pre-legalize combiner pass

[Matt Arsenault via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: a174f0da62f1cad36d21c040bf37bfdd291b28cf
      https://github.com/llvm/llvm-project/commit/a174f0da62f1cad36d21c040bf37bfdd291b28cf
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2020-01-22 (Wed, 22 Jan 2020)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPU.h
    A llvm/lib/Target/AMDGPU/AMDGPUCombine.td
    M llvm/lib/Target/AMDGPU/AMDGPUGISel.td
    A llvm/lib/Target/AMDGPU/AMDGPUPreLegalizerCombiner.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
    M llvm/lib/Target/AMDGPU/CMakeLists.txt
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.atomic.dec.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.atomic.inc.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.end.cf.i32.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.end.cf.i64.ll

  Log Message:
  -----------
  AMDGPU/GlobalISel: Add pre-legalize combiner pass

Just copy the AArch64 pass as-is for now, except for removing the
memcpy handling.


  Commit: bcd91778fe7e6fc66cdccc5ddc3ff3fc48909f6b
      https://github.com/llvm/llvm-project/commit/bcd91778fe7e6fc66cdccc5ddc3ff3fc48909f6b
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2020-01-22 (Wed, 22 Jan 2020)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUCodeGenPrepare.cpp
    A llvm/test/CodeGen/AMDGPU/amdgpu-codegenprepare-fold-binop-select.ll
    M llvm/test/CodeGen/AMDGPU/dagcombine-select.ll
    M llvm/test/CodeGen/AMDGPU/select-fabs-fneg-extract.ll

  Log Message:
  -----------
  AMDGPU: Do binop of select of constant fold in AMDGPUCodeGenPrepare

DAGCombiner does this, but divisions expanded here miss this
optimization. Since 67aa18f165640374cf0e0a6226dc793bbda6e74f,
divisions have been expanded here and missed out on this
optimization. Avoids test regressions in a future patch.


  Commit: 2fe500ab5bb4d50a5ac6ed9600f9900b46e55802
      https://github.com/llvm/llvm-project/commit/2fe500ab5bb4d50a5ac6ed9600f9900b46e55802
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2020-01-22 (Wed, 22 Jan 2020)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUCodeGenPrepare.cpp
    M llvm/test/CodeGen/AMDGPU/amdgpu-codegenprepare-fold-binop-select.ll
    M llvm/test/CodeGen/AMDGPU/dagcombine-select.ll

  Log Message:
  -----------
  AMDGPU: Look through casted selects to constant fold bin ops

The promotion of the uniform select to i32 interfered with this fold.


Compare: https://github.com/llvm/llvm-project/compare/968561bcdc34...2fe500ab5bb4