1 | //===-- subvti3.c - Implement __subvti3 -----------------------------------===// |
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | // |
9 | // This file implements __subvti3 for the compiler_rt library. |
10 | // |
11 | //===----------------------------------------------------------------------===// |
12 | |
13 | #include "int_lib.h" |
14 | |
15 | #ifdef CRT_HAS_128BIT |
16 | |
17 | // Returns: a - b |
18 | |
19 | // Effects: aborts if a - b overflows |
20 | |
21 | COMPILER_RT_ABI ti_int __subvti3(ti_int a, ti_int b) { |
22 | ti_int s = (tu_int)a - (tu_int)b; |
23 | if (b >= 0) { |
24 | if (s > a) |
25 | compilerrt_abort(); |
26 | } else { |
27 | if (s <= a) |
28 | compilerrt_abort(); |
29 | } |
30 | return s; |
31 | } |
32 | |
33 | #endif // CRT_HAS_128BIT |
34 | |