1276789Sdim/* ===-- subvdi3.c - Implement __subvdi3 -----------------------------------===
2276789Sdim *
3276789Sdim *                The LLVM Compiler Infrastructure
4276789Sdim *
5276789Sdim * This file is dual licensed under the MIT and the University of Illinois Open
6276789Sdim * Source Licenses. See LICENSE.TXT for details.
7276789Sdim *
8276789Sdim * ===----------------------------------------------------------------------===
9276789Sdim *
10276789Sdim * This file implements __subvdi3 for the compiler_rt library.
11276789Sdim *
12276789Sdim * ===----------------------------------------------------------------------===
13276789Sdim */
14276789Sdim
15276789Sdim#include "int_lib.h"
16276789Sdim
17276789Sdim/* Returns: a - b */
18276789Sdim
19276789Sdim/* Effects: aborts if a - b overflows */
20276789Sdim
21276789SdimCOMPILER_RT_ABI di_int
22276789Sdim__subvdi3(di_int a, di_int b)
23276789Sdim{
24276789Sdim    di_int s = (du_int) a - (du_int) b;
25276789Sdim    if (b >= 0)
26276789Sdim    {
27276789Sdim        if (s > a)
28276789Sdim            compilerrt_abort();
29276789Sdim    }
30276789Sdim    else
31276789Sdim    {
32276789Sdim        if (s <= a)
33276789Sdim            compilerrt_abort();
34276789Sdim    }
35276789Sdim    return s;
36276789Sdim}
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