1 /* ===-- subvdi3.c - Implement __subvdi3 -----------------------------------===
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 __subvdi3 for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15 #include "int_lib.h"
16 #include <stdlib.h>
17
18 /* Returns: a - b */
19
20 /* Effects: aborts if a - b overflows */
21
22 di_int
__subvdi3(di_int a,di_int b)23 __subvdi3(di_int a, di_int b)
24 {
25 di_int s = a - b;
26 if (b >= 0)
27 {
28 if (s > a)
29 abort();
30 }
31 else
32 {
33 if (s <= a)
34 abort();
35 }
36 return s;
37 }
38