[PATCH] D64393: [AMDGPU] Fix DPP combiner check for exec modification

[Valery Pykhtin via Phabricator via llvm-commits]

vpykhtin added a comment.

Sorry, there is a code for returnining unique instr, so we can use the count:

  defusechain_instr_iterator &operator++() {          // Preincrement
        assert(Op && "Cannot increment end iterator!");
        if (ByOperand)
          advance();
        else if (ByInstr) {
          MachineInstr *P = Op->getParent();
          do {
            advance();
          } while (Op && Op->getParent() == P); // <- removes duplicates


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https://reviews.llvm.org/D64393