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
24 ti_int
__subvti3(ti_int a,ti_int b)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