Function GetPhiIndexFromLabel

source/opt/loop_unroller.cpp:338–346

Retrieve the index of the OpPhi instruction |phi| which corresponds to the incoming |block| id.

// Retrieve the index of the OpPhi instruction |phi| which corresponds to the
// incoming |block| id.
uint32_t GetPhiIndexFromLabel(const BasicBlock* block, const Instruction* phi) {
  for (uint32_t i = 1; i < phi->NumInOperands(); i += 2) {
    if (block->id() == phi->GetSingleWordInOperand(i)) {
      return i;
    }
  }
  assert(false && "Could not find operand in instruction.");
  return 0;
}

void LoopUnrollerUtilsImpl::Init(Loop* loop) {
  loop_condition_block_ = loop->FindConditionBlock();