X86_INT_REGISTER_END
if (index < X86_INT_REGISTER_END)
if (!IsRegisterSet(index) || index >= X86_INT_REGISTER_END)
if (index < 0 || index >= X86_INT_REGISTER_END)
#define X86_INT_REGISTER_COUNT X86_INT_REGISTER_END
#define X86_FP_REGISTER_COUNT (X86_FP_REGISTER_END - X86_INT_REGISTER_END)