10b57cec5SDimitry Andric //===-- absvsi2.c - Implement __absvsi2 -----------------------------------===// 20b57cec5SDimitry Andric // 30b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 40b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 50b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 60b57cec5SDimitry Andric // 70b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 80b57cec5SDimitry Andric // 90b57cec5SDimitry Andric // This file implements __absvsi2 for the compiler_rt library. 100b57cec5SDimitry Andric // 110b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 120b57cec5SDimitry Andric 130b57cec5SDimitry Andric #include "int_lib.h" 140b57cec5SDimitry Andric 150b57cec5SDimitry Andric // Returns: absolute value 160b57cec5SDimitry Andric 170b57cec5SDimitry Andric // Effects: aborts if abs(x) < 0 180b57cec5SDimitry Andric __absvsi2(si_int a)190b57cec5SDimitry AndricCOMPILER_RT_ABI si_int __absvsi2(si_int a) { 200b57cec5SDimitry Andric const int N = (int)(sizeof(si_int) * CHAR_BIT); 21*06c3fb27SDimitry Andric if (a == ((si_int)((su_int)1 << (N - 1)))) 220b57cec5SDimitry Andric compilerrt_abort(); 230b57cec5SDimitry Andric const si_int t = a >> (N - 1); 240b57cec5SDimitry Andric return (a ^ t) - t; 250b57cec5SDimitry Andric } 26