1-Byte INC in 64-bit code!

Are you still mad at AMD for destroying the one-byte encoding of INC when they stomped over the whole row from 40h to 4Fh with their newfangled "REX" prefixes? Think of the code density! Be mad no more with one_byte_inc!!!

As we all know, x86-64 CPUs all support compatibility mode, so the instruction decoder still needs to support the 1-byte INC. If only we can access it in 64-bit code...

Well, now you can!!!

Usage

Simply include one_byte_inc.h in your source and link with -lone_byte_inc.

In your code, initialize the library using init_one_byte_inc(), which returns 0 on success. -1 is returned on error and errno is set.

After that, just use one_byte_inc() for all your 1-byte incrementing needs!

Example

#include <stdio.h>
#include "one_byte_inc.h"

int main() {
    init_one_byte_inc();
    printf("%d\n", one_byte_inc(89017)); // prints: 89018
}

See also the example in example.c.

Building

Run ./build.sh to generate static and dynamic libraries, as well as the example binary.

How does it work?

umm... uhh...