| 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 | |