compiler/utils/mips/assembler_mips.cc [1737:1758]:
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MipsAssembler::Branch::OffsetBits MipsAssembler::Branch::GetOffsetSizeNeeded(uint32_t location,
                                                                             uint32_t target) {
  // For unresolved targets assume the shortest encoding
  // (later it will be made longer if needed).
  if (target == kUnresolved)
    return kOffset16;
  int64_t distance = static_cast<int64_t>(target) - location;
  // To simplify calculations in composite branches consisting of multiple instructions
  // bump up the distance by a value larger than the max byte size of a composite branch.
  distance += (distance >= 0) ? kMaxBranchSize : -kMaxBranchSize;
  if (IsInt<kOffset16>(distance))
    return kOffset16;
  else if (IsInt<kOffset18>(distance))
    return kOffset18;
  else if (IsInt<kOffset21>(distance))
    return kOffset21;
  else if (IsInt<kOffset23>(distance))
    return kOffset23;
  else if (IsInt<kOffset28>(distance))
    return kOffset28;
  return kOffset32;
}
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compiler/utils/mips64/assembler_mips64.cc [1412:1433]:
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Mips64Assembler::Branch::OffsetBits Mips64Assembler::Branch::GetOffsetSizeNeeded(uint32_t location,
                                                                                 uint32_t target) {
  // For unresolved targets assume the shortest encoding
  // (later it will be made longer if needed).
  if (target == kUnresolved)
    return kOffset16;
  int64_t distance = static_cast<int64_t>(target) - location;
  // To simplify calculations in composite branches consisting of multiple instructions
  // bump up the distance by a value larger than the max byte size of a composite branch.
  distance += (distance >= 0) ? kMaxBranchSize : -kMaxBranchSize;
  if (IsInt<kOffset16>(distance))
    return kOffset16;
  else if (IsInt<kOffset18>(distance))
    return kOffset18;
  else if (IsInt<kOffset21>(distance))
    return kOffset21;
  else if (IsInt<kOffset23>(distance))
    return kOffset23;
  else if (IsInt<kOffset28>(distance))
    return kOffset28;
  return kOffset32;
}
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