compiler/utils/mips/assembler_mips.cc [1805:1833]:
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uint32_t MipsAssembler::Branch::PromoteIfNeeded(uint32_t max_short_distance) {
  // If the branch is still unresolved or already long, nothing to do.
  if (IsLong() || !IsResolved()) {
    return 0;
  }
  // Promote the short branch to long if the offset size is too small
  // to hold the distance between location_ and target_.
  if (GetOffsetSizeNeeded(location_, target_) > GetOffsetSize()) {
    PromoteToLong();
    uint32_t old_size = GetOldSize();
    uint32_t new_size = GetSize();
    CHECK_GT(new_size, old_size);
    return new_size - old_size;
  }
  // The following logic is for debugging/testing purposes.
  // Promote some short branches to long when it's not really required.
  if (UNLIKELY(max_short_distance != std::numeric_limits<uint32_t>::max())) {
    int64_t distance = static_cast<int64_t>(target_) - location_;
    distance = (distance >= 0) ? distance : -distance;
    if (distance >= max_short_distance) {
      PromoteToLong();
      uint32_t old_size = GetOldSize();
      uint32_t new_size = GetSize();
      CHECK_GT(new_size, old_size);
      return new_size - old_size;
    }
  }
  return 0;
}
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compiler/utils/mips64/assembler_mips64.cc [1470:1498]:
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uint32_t Mips64Assembler::Branch::PromoteIfNeeded(uint32_t max_short_distance) {
  // If the branch is still unresolved or already long, nothing to do.
  if (IsLong() || !IsResolved()) {
    return 0;
  }
  // Promote the short branch to long if the offset size is too small
  // to hold the distance between location_ and target_.
  if (GetOffsetSizeNeeded(location_, target_) > GetOffsetSize()) {
    PromoteToLong();
    uint32_t old_size = GetOldSize();
    uint32_t new_size = GetSize();
    CHECK_GT(new_size, old_size);
    return new_size - old_size;
  }
  // The following logic is for debugging/testing purposes.
  // Promote some short branches to long when it's not really required.
  if (UNLIKELY(max_short_distance != std::numeric_limits<uint32_t>::max())) {
    int64_t distance = static_cast<int64_t>(target_) - location_;
    distance = (distance >= 0) ? distance : -distance;
    if (distance >= max_short_distance) {
      PromoteToLong();
      uint32_t old_size = GetOldSize();
      uint32_t new_size = GetSize();
      CHECK_GT(new_size, old_size);
      return new_size - old_size;
    }
  }
  return 0;
}
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