[PATCH] D74849: AMDGPU/GlobalISel: Fix incorrect VOP3P fneg folding

[Matt Arsenault via Phabricator via llvm-commits]

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

We use some s32 values in VOP3P operands, and won't see any
intervening casts from a 32-bit fneg. Make sure it's really a packed
fneg before folding.


https://reviews.llvm.org/D74849

Files:
  llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.fdot2.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.sdot2.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.sdot4.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.sdot8.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.udot2.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.udot4.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.udot8.ll

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