[PATCH] D49483: [AMDGPU] Optimize _L image intrinsic to _LZ when lod is zero

[Ryan Taylor via Phabricator via llvm-commits]

rtaylor created this revision.
Herald added subscribers: llvm-commits, dexonsmith, steven_wu, t-tye, tpr, dstuttard, yaxunl, nhaehnle, wdng, kzhuravl, mehdi_amini, arsenm.

Add _L to _LZ image intrinsic table mapping to table gen.
In ISelLowering check if image intrinsic has lod and if it's equal
to zero, if so remove lod and change opcode to equivalent mapped _LZ.

Change-Id: Ie24cd7e788e2195d846c7bd256151178cbb9ec71


Repository:
  rL LLVM

https://reviews.llvm.org/D49483

Files:
  lib/Target/AMDGPU/MIMGInstructions.td
  lib/Target/AMDGPU/SIISelLowering.cpp
  lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
  lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h
  test/CodeGen/AMDGPU/llvm.amdgcn.image.sample.ltolz.ll

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