[PATCH] D82551: [AMDGPU] Don't combine DPP if DPP register is used more than once per instruction

[Jay Foad via Phabricator via llvm-commits]

foad added inline comments.


================
Comment at: llvm/lib/Target/AMDGPU/GCNDPPCombine.cpp:540-541
       }
     } else if (OrigMI.isCommutable() &&
                Use == TII->getNamedOperand(OrigMI, AMDGPU::OpName::src1)) {
       auto *BB = OrigMI.getParent();
----------------
It would be much simpler to add a check here that src0 and src1 are not the same register.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D82551/new/

https://reviews.llvm.org/D82551