| 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 | |