linux-kernel-module-cheat/userland/arch/x86_64/binutils_hack.c

#include <assert.h>
#include <inttypes.h>

int main(void) {
#if 0
	uint64_t in = 0xFFFFFFFF;
	uint64_t out = 0;
	__asm__ (
		"mov %[in], %%rax;"
		"myinc %%rax;"
		"movq %%rax, %[out]"
		: [out] "=g" (out)
		: [in] "g" (in)
		: "rax"
	);
	assert(out == in + 1);
#endif
}