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Встроенный ассемблер: ввод и вывод

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#include <stdio.h>
main()
{
	int a, b;
	a = b = 5;
	__asm__  __volatile__("addl %%ebx, %%eax"
		: "=eax" (a)
		: "eax" (a),"ebx" (
		: "eax"
	);
	printf("%d\n", a);
}


>gcc test.c
test.c:6: error: impossible constraint in ‘asm’

что не так? пример из статьи, вроде должен работать..
может, какой заголовок нужен?

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