compiler/utils/mips/assembler_mips.cc [1926:1943]:
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void MipsAssembler::FinalizeLabeledBranch(MipsLabel* label) {
  uint32_t length = branches_.back().GetLength();
  if (!label->IsBound()) {
    // Branch forward (to a following label), distance is unknown.
    // The first branch forward will contain 0, serving as the terminator of
    // the list of forward-reaching branches.
    Emit(label->position_);
    length--;
    // Now make the label object point to this branch
    // (this forms a linked list of branches preceding this label).
    uint32_t branch_id = branches_.size() - 1;
    label->LinkTo(branch_id);
  }
  // Reserve space for the branch.
  while (length--) {
    Nop();
  }
}
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compiler/utils/mips64/assembler_mips64.cc [1591:1608]:
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void Mips64Assembler::FinalizeLabeledBranch(Mips64Label* label) {
  uint32_t length = branches_.back().GetLength();
  if (!label->IsBound()) {
    // Branch forward (to a following label), distance is unknown.
    // The first branch forward will contain 0, serving as the terminator of
    // the list of forward-reaching branches.
    Emit(label->position_);
    length--;
    // Now make the label object point to this branch
    // (this forms a linked list of branches preceding this label).
    uint32_t branch_id = branches_.size() - 1;
    label->LinkTo(branch_id);
  }
  // Reserve space for the branch.
  while (length--) {
    Nop();
  }
}
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