[all-commits] [llvm/llvm-project] 078da2: [AMDGPU] Check for unneeded shift mask in shift Pa...

[Abinav Puthan Purayil via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 078da26b1ce3e509b9705bba95686e4ef8b8e480
      https://github.com/llvm/llvm-project/commit/078da26b1ce3e509b9705bba95686e4ef8b8e480
  Author: Abinav Puthan Purayil <abinav.puthanpurayil at amd.com>
  Date:   2021-11-24 (Wed, 24 Nov 2021)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h
    M llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
    M llvm/lib/Target/AMDGPU/AMDGPUInstructions.td
    M llvm/test/CodeGen/AMDGPU/GlobalISel/ashr.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/fshl.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/fshr.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/lshr.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/shl.ll
    M llvm/test/CodeGen/AMDGPU/ashr.v2i16.ll
    M llvm/test/CodeGen/AMDGPU/constrained-shift.ll
    M llvm/test/CodeGen/AMDGPU/extract-lowbits.ll
    M llvm/test/CodeGen/AMDGPU/imm16.ll
    M llvm/test/CodeGen/AMDGPU/lshr.v2i16.ll
    M llvm/test/CodeGen/AMDGPU/shl.ll
    M llvm/test/CodeGen/AMDGPU/shl.v2i16.ll
    M llvm/test/CodeGen/AMDGPU/sra.ll

  Log Message:
  -----------
  [AMDGPU] Check for unneeded shift mask in shift PatFrags.

The existing constrained shift PatFrags only dealt with masked shift
from OpenCL front-ends. This change copies the
X86DAGToDAGISel::isUnneededShiftMask() function to AMDGPU and uses it in
the shift PatFrag predicates.

Differential Revision: https://reviews.llvm.org/D113448