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)1 << (N - 1))) 22 compilerrt_abort(); 23 const si_int t = a >> (N - 1); 24 return (a ^ t) - t; 25 } 26