There is no 64-bit version of CRTDLL library. MinGW-w64 provided bogus
64-bit import library for non-existent runtime DLL library, which was
recently deleted.
#define _inpd(x) __indword(x)
#elif defined(__CRTDLL__)
/*
- * Old CRTDLL library does not provide I/O port functions. Even it is the oldest
- * CRT library it exists also in 64-bit variant. Implement I/O port functions
- * via inline assembly just for 32-bit mode as 64-bit mode uses above <intrin.h>
- * header.
+ * Old 32-bit CRTDLL library does not provide I/O port functions. As this
+ * library exists only in 32-bit mode variant, implement I/O port functions
+ * via 32-bit inline assembly.
*/
static inline int _outp(unsigned short port, int databyte)
{