// Round n up to be a multiple of base
template <typename IntType>
constexpr IntType CeilToMultiple(IntType n, IntType base) {
- return (n + base - 1) / base * base;
+ return (n + base - 1) / base * base;
}
- // Read a signed or unsigned integer from a stream in little-endian order
+ // read_little_endian() is our utility to read an integer (signed or unsigned, any size)
+ // from a stream in little-endian order. We swap the byte order after the read if
+ // necessary to return a result with the byte ordering of the compiling machine.
template <typename IntType>
- inline IntType read_le(std::istream& stream) {
- // Read the relevant bytes from the stream in little-endian order
- std::uint8_t u[sizeof(IntType)];
- stream.read(reinterpret_cast<char*>(u), sizeof(IntType));
- // Use unsigned arithmetic to convert to machine order
- typename std::make_unsigned<IntType>::type v = 0;
- for (std::size_t i = 0; i < sizeof(IntType); ++i)
- v = (v << 8) | u[sizeof(IntType) - i - 1];
- // Copy the machine-ordered bytes into a potentially signed value
- IntType w;
- std::memcpy(&w, &v, sizeof(IntType));
- return w;
+ inline IntType read_little_endian(std::istream& stream) {
+
+ IntType result;
+ std::uint8_t u[sizeof(IntType)];
+ typename std::make_unsigned<IntType>::type v = 0;
+
+ stream.read(reinterpret_cast<char*>(u), sizeof(IntType));
+ for (std::size_t i = 0; i < sizeof(IntType); ++i)
+ v = (v << 8) | u[sizeof(IntType) - i - 1];
+
+ std::memcpy(&result, &v, sizeof(IntType));
+ return result;
}
} // namespace Eval::NNUE