1 | /* ===-- addvsi3.c - Implement __addvsi3 -----------------------------------=== |
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 __addvsi3 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 | |
21 | COMPILER_RT_ABI si_int |
22 | __addvsi3(si_int a, si_int b) |
23 | { |
24 | si_int s = (su_int) a + (su_int) 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 | |