[all-commits] [llvm/llvm-project] a04580: [AMDGPU] Implement vop3p complex pattern optmizati...

[Shoreshen via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a04580f71b98bdb12100da66c9975e9a1001b4d6
      https://github.com/llvm/llvm-project/commit/a04580f71b98bdb12100da66c9975e9a1001b4d6
  Author: Shoreshen <372660931 at qq.com>
  Date:   2025-04-18 (Fri, 18 Apr 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
    M llvm/test/CodeGen/AMDGPU/GlobalISel/fmul.v2f16.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.sdot2.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.udot2.ll
    M llvm/test/CodeGen/AMDGPU/strict_fsub.f16.ll

  Log Message:
  -----------
  [AMDGPU] Implement vop3p complex pattern optmization for gisel (#130234)

Seeking opportunities to optimize VOP3P instructions by altering opsel,
opsel_hi, neg, neg_hi bits

Tests differences:
1. fix op_sel_hi bit for inline constant:
   1. `CodeGen/AMDGPU/packed-fp32.ll`
2. use neg bit to remove xor with 0x80008000
   1. `CodeGen/AMDGPU/strict_fsub.f16.ll`
   2. `CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.fdot2.ll`
   3. `CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.sdot4.ll`
   4. `CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.sdot8.ll`
   5. `CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.udot2.ll`
   6. `CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.udot4.ll`
   7. `CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.udot8.ll`
3. Remove xor 0x80008000, and use opsel, opsel_hi to remove alignbit
   1. `CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.sdot2.ll`



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