1214152Sed/* ===-- subvsi3.c - Implement __subvsi3 -----------------------------------===
2214152Sed *
3222656Sed *                The LLVM Compiler Infrastructure
4214152Sed *
5222656Sed * This file is dual licensed under the MIT and the University of Illinois Open
6222656Sed * Source Licenses. See LICENSE.TXT for details.
7214152Sed *
8214152Sed * ===----------------------------------------------------------------------===
9214152Sed *
10214152Sed * This file implements __subvsi3 for the compiler_rt library.
11214152Sed *
12214152Sed * ===----------------------------------------------------------------------===
13214152Sed */
14214152Sed
15214152Sed#include "int_lib.h"
16214152Sed
17214152Sed/* Returns: a - b */
18214152Sed
19214152Sed/* Effects: aborts if a - b overflows */
20214152Sed
21222656SedCOMPILER_RT_ABI si_int
22214152Sed__subvsi3(si_int a, si_int b)
23214152Sed{
24214152Sed    si_int s = a - b;
25214152Sed    if (b >= 0)
26214152Sed    {
27214152Sed        if (s > a)
28214152Sed            compilerrt_abort();
29214152Sed    }
30214152Sed    else
31214152Sed    {
32214152Sed        if (s <= a)
33214152Sed            compilerrt_abort();
34214152Sed    }
35214152Sed    return s;
36214152Sed}
37