bswapOps.hpp

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/*
* Byte Swapping Operations
*/
 
#ifndef IV_SRC_CORE_BYTESWAPOPS_HPP_
#define IV_SRC_CORE_BYTESWAPOPS_HPP_
 
#include <cstdint>
 
namespace iv::bit
{
 
constexpr uint16_t reverseBytes(const uint16_t x)
{
    return static_cast<uint16_t>((x << 8) | (x >> 8));
}
 
constexpr uint32_t reverseBytes(const uint32_t x)
{
    // MSVC at least recognizes this as a bswap
    return ((x & 0x000000FF) << 24) | ((x & 0x0000FF00) << 8) | ((x & 0x00FF0000) >> 8) | ((x & 0xFF000000) >> 24);
}
 
constexpr uint64_t reverseBytes(const uint64_t x)
{
    auto hi = static_cast<uint32_t>(x >> 32);
    auto lo = static_cast<uint32_t>(x);
 
    hi = reverseBytes(hi);
    lo = reverseBytes(lo);
 
    return (static_cast<uint64_t>(lo) << 32) | hi;
}
 
}// namespace iv::bit
 
#endif