addvti3.c revision 2d1fdb26e458c4ddc04155c1d421bced3ba90cd0 
1/* ===-- addvti3.c - Implement __addvti3 -----------------------------------===
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 __addvti3 for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15#include "int_lib.h"
16
17#ifdef CRT_HAS_128BIT
18
19/* Returns: a + b */
20
21/* Effects: aborts if a + b overflows */
22
23COMPILER_RT_ABI ti_int
24__addvti3(ti_int a, ti_int b)
25{
26    ti_int s = a + b;
27    if (b >= 0)
28    {
29        if (s < a)
30            compilerrt_abort();
31    }
32    else
33    {
34        if (s >= a)
35            compilerrt_abort();
36    }
37    return s;
38}
39
40#endif /* CRT_HAS_128BIT */
41