Are there any platforms where pointers to differen

Question

The C standard allows pointers to different types to have different sizes, e.g. sizeof(char*) != sizeof(int*) is permitted. It does, however, require that if a pointer is converted to a void* and then converted back to its original type, it must compare as equal to its original value. Therefore, it follows logically that sizeof(void*) >= sizeof(T*) for all types T, correct?

On most common platforms in use today (x86, PPC, ARM, and 64-bit variants, etc.), the size of all pointers equals the native register size (4 or 8 bytes), regardless of the pointed-to type. Are there any esoteric or embedded platforms where pointers to different types might have different sizes? I'm specifically asking about data pointers, although I'd also be interested to know if there are platforms where function pointers have unusual sizes.

I'm definitely not asking about C++'s pointer-to-members and pointer-to-member-functions. Those take on unusual sizes on common platforms, and can even vary within one platform, depending on the properties of the pointer-to class (non-polymorphic, single inheritance, multiple inheritance, virtual inheritance, or incomplete type).

Answer 1

Not quite what you're asking, but back in the 16-bit DOS/Windows days, you did have the distinction between a pointer and a far-pointer, the latter being 32-bits.

I might have the syntax wrong...

int *pInt = malloc(sizeof(int));
int far *fpInt = _fmalloc(sizeof(int));

printf("pInt: %d, fpInt: %d\n", sizeof(pInt), sizeof(fpInt));

Output:

pInt: 2, fpInt 4