13cab2bb3Spatrick //===-- absvsi2.c - Implement __absvsi2 -----------------------------------===// 23cab2bb3Spatrick // 33cab2bb3Spatrick // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 43cab2bb3Spatrick // See https://llvm.org/LICENSE.txt for license information. 53cab2bb3Spatrick // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 63cab2bb3Spatrick // 73cab2bb3Spatrick //===----------------------------------------------------------------------===// 83cab2bb3Spatrick // 93cab2bb3Spatrick // This file implements __absvsi2 for the compiler_rt library. 103cab2bb3Spatrick // 113cab2bb3Spatrick //===----------------------------------------------------------------------===// 123cab2bb3Spatrick 133cab2bb3Spatrick #include "int_lib.h" 143cab2bb3Spatrick 153cab2bb3Spatrick // Returns: absolute value 163cab2bb3Spatrick 173cab2bb3Spatrick // Effects: aborts if abs(x) < 0 183cab2bb3Spatrick __absvsi2(si_int a)193cab2bb3SpatrickCOMPILER_RT_ABI si_int __absvsi2(si_int a) { 203cab2bb3Spatrick const int N = (int)(sizeof(si_int) * CHAR_BIT); 21*1f9cb04fSpatrick if (a == ((si_int)1 << (N - 1))) 223cab2bb3Spatrick compilerrt_abort(); 233cab2bb3Spatrick const si_int t = a >> (N - 1); 243cab2bb3Spatrick return (a ^ t) - t; 253cab2bb3Spatrick } 26