[PATCH] D74315: AMDGPU/GlobalISel: Start handling _L to _LZ optimization

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: nhaehnle, kerbowa.
Herald added subscribers: Petar.Avramovic, dexonsmith, steven_wu, hiraditya, t-tye, tpr, dstuttard, rovka, yaxunl, wdng, jvesely, kzhuravl.
Herald added a project: LLVM.

We currently don't have a way to map to the equivalent intrinsic
opcode, so track immediate 0s in place of the address for the
selection to know to change the final opcode.


https://reviews.llvm.org/D74315

Files:
  llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
  llvm/test/CodeGen/AMDGPU/GlobalISel/image_ls_mipmap_zero.a16.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/image_ls_mipmap_zero.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.image.sample.ltolz.a16.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.image.sample.ltolz.ll

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