addvsi3.c revision 215125 
1/* ===-- addvsi3.c - Implement __addvsi3 -----------------------------------===
2 *
3 *                    The LLVM Compiler Infrastructure
4 *
5 * This file is distributed under the University of Illinois Open Source
6 * License. See LICENSE.TXT for details.
7 *
8 * ===----------------------------------------------------------------------===
9 *
10 * This file implements __addvsi3 for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15#include "int_lib.h"
16#include <stdlib.h>
17
18/* Returns: a + b */
19
20/* Effects: aborts if a + b overflows */
21
22si_int
23__addvsi3(si_int a, si_int b)
24{
25    si_int s = a + b;
26    if (b >= 0)
27    {
28        if (s < a)
29            compilerrt_abort();
30    }
31    else
32    {
33        if (s >= a)
34            compilerrt_abort();
35    }
36    return s;
37}
38