[PATCH] D74926: AMDGPU/GlobalISel: Fix constant bus violation with source modifiers

[Matt Arsenault via Phabricator via llvm-commits]

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

This looked through copies to find the source modifiers, which may
have been SGPR->VGPR copies added to avoid potential constant bus
violations. Re-insert a copy to a VGPR if this happens.


https://reviews.llvm.org/D74926

Files:
  llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
  llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
  llvm/test/CodeGen/AMDGPU/GlobalISel/constant-bus-restriction.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/inst-select-fadd.s32.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/inst-select-fadd.s64.mir

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