addvdi3.c revision 2d1fdb26e458c4ddc04155c1d421bced3ba90cd0 
1/* ===-- addvdi3.c - Implement __addvdi3 -----------------------------------===
2 *
3 *                     The LLVM Compiler Infrastructure
4 *
5 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
7 *
8 * ===----------------------------------------------------------------------===
9 *
10 * This file implements __addvdi3 for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15#include "int_lib.h"
16
17/* Returns: a + b */
18
19/* Effects: aborts if a + b overflows */
20
21COMPILER_RT_ABI di_int
22__addvdi3(di_int a, di_int b)
23{
24    di_int s = a + b;
25    if (b >= 0)
26    {
27        if (s < a)
28            compilerrt_abort();
29    }
30    else
31    {
32        if (s >= a)
33            compilerrt_abort();
34    }
35    return s;
36}
37