Function if

KernelLibrary/disasm.cpp:790–793

REX.W trumps 66

#ifdef DETOURS_X64
    // REX.W trumps 66
    else if (m_RaxOverride) {
        bool rax = (flagBits & FlagBits::Rax) == FlagBits::Rax;
        bytesFixed = fixedSize + (rax ? 4 : 0);
    }
#endif // DETOURS_X64
    else {
        bytesFixed = m_OperandOverride ? fixedSize16 : fixedSize;