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