[PATCH] D117678: AMDGPU/GlobalISel: Fix selection of gfx90a FP atomics

[Matt Arsenault via Phabricator via llvm-commits]

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The struct/raw forms for the buffer atomics now work as
expected. However, we're incorrectly handling the legacy form (which
we probably shouldn't handle at all). We also are not diagnosing the
use of the return value on gfx908. These will be addressed separately.


https://reviews.llvm.org/D117678

Files:
  llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
  llvm/lib/Target/AMDGPU/FLATInstructions.td
  llvm/test/CodeGen/AMDGPU/GlobalISel/fp64-atomics-gfx90a.ll

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