1 | //===-- absvsi2.c - Implement __absvsi2 -----------------------------------===// |
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 __absvsi2 for the compiler_rt library. |
10 | // |
11 | //===----------------------------------------------------------------------===// |
12 | |
13 | #include "int_lib.h" |
14 | |
15 | // Returns: absolute value |
16 | |
17 | // Effects: aborts if abs(x) < 0 |
18 | |
19 | COMPILER_RT_ABI si_int __absvsi2(si_int a) { |
20 | const int N = (int)(sizeof(si_int) * CHAR_BIT); |
21 | if (a == ((si_int)((su_int)1 << (N - 1)))) |
22 | compilerrt_abort(); |
23 | const si_int t = a >> (N - 1); |
24 | return (a ^ t) - t; |
25 | } |
26 | |