1/* ===-- subvti3.c - Implement __subvti3 -----------------------------------===
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 __subvti3 for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15#if __x86_64
16
17#include "int_lib.h"
18#include <stdlib.h>
19
20/* Returns: a - b */
21
22/* Effects: aborts if a - b overflows */
23
24ti_int
25__subvti3(ti_int a, ti_int b)
26{
27    ti_int s = a - b;
28    if (b >= 0)
29    {
30        if (s > a)
31            abort();
32    }
33    else
34    {
35        if (s <= a)
36            abort();
37    }
38    return s;
39}
40
41#endif /* __x86_64 */
42