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1 /* ===-- subvdi3.c - Implement __subvdi3 -----------------------------------===
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 __subvdi3 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 di_int
__subvdi3(di_int a,di_int b)22 __subvdi3(di_int a, di_int b)
23 {
24     di_int s = (du_int) a - (du_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