Function IsMerge

source/opt/block_merge_util.cpp:35–45

Returns true if |id| is the merge target of a merge instruction.

// Returns true if |id| is the merge target of a merge instruction.
bool IsMerge(IRContext* context, uint32_t id) {
  return !context->get_def_use_mgr()->WhileEachUse(
      id, [](Instruction* user, uint32_t index) {
        spv::Op op = user->opcode();
        if ((op == spv::Op::OpLoopMerge || op == spv::Op::OpSelectionMerge) &&
            index == 0u) {
          return false;
        }
        return true;
      });
}

// Returns true if |block| is the merge target of a merge instruction.
bool IsMerge(IRContext* context, BasicBlock* block) {