1214152Sed/* ===-- absvsi2.c - Implement __absvsi2 -----------------------------------=== 2214152Sed * 3214152Sed * The LLVM Compiler Infrastructure 4214152Sed * 5222656Sed * This file is dual licensed under the MIT and the University of Illinois Open 6222656Sed * Source Licenses. See LICENSE.TXT for details. 7214152Sed * 8214152Sed * ===----------------------------------------------------------------------=== 9214152Sed * 10214152Sed * This file implements __absvsi2 for the compiler_rt library. 11214152Sed * 12214152Sed * ===----------------------------------------------------------------------=== 13222656Sed */ 14214152Sed 15214152Sed#include "int_lib.h" 16214152Sed 17214152Sed/* Returns: absolute value */ 18214152Sed 19214152Sed/* Effects: aborts if abs(x) < 0 */ 20214152Sed 21222656SedCOMPILER_RT_ABI si_int 22214152Sed__absvsi2(si_int a) 23214152Sed{ 24214152Sed const int N = (int)(sizeof(si_int) * CHAR_BIT); 25214152Sed if (a == (1 << (N-1))) 26214152Sed compilerrt_abort(); 27214152Sed const si_int t = a >> (N - 1); 28214152Sed return (a ^ t) - t; 29214152Sed} 30