2 * inline-asm-sum - an example of inline assembly use
4 * Copyright (C) 2013 Antonio Ospite <ospite@studenti.unina.it>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
22 static int sum(int a, int b)
24 #if defined(__i386__) || defined(__x86_64__)
26 __asm__("addl %2, %1\n\t"
27 : "=a"(ret) /* %0 bound to %eax */
28 : "a"(a), "r"(b) /* %1 is 'a' bound to %eax, %2 is 'b' */
47 printf("%d + %d = %d\n", a, b, ret);