llvm-project
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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
19COMPILER_RT_ABI si_int __absvsi2(si_int a) {
20const int N = (int)(sizeof(si_int) * CHAR_BIT);
21if (a == ((si_int)((su_int)1 << (N - 1))))
22compilerrt_abort();
23const si_int t = a >> (N - 1);
24return (a ^ t) - t;
25}
26