1 /* ===-- absvsi2.c - Implement __absvsi2 -----------------------------------=== 2 * 3 * The LLVM Compiler Infrastructure 4 * 5 * This file is distributed under the University of Illinois Open Source 6 * License. See LICENSE.TXT for details. 7 * 8 * ===----------------------------------------------------------------------=== 9 * 10 * This file implements __absvsi2 for the compiler_rt library. 11 * 12 * ===----------------------------------------------------------------------=== 13 */ 14 15 #include "int_lib.h" 16 #include <stdlib.h> 17 18 /* Returns: absolute value */ 19 20 /* Effects: aborts if abs(x) < 0 */ 21 22 si_int 23 __absvsi2(si_int a) 24 { 25 const int N = (int)(sizeof(si_int) * CHAR_BIT); 26 if (a == (1 << (N-1))) 27 abort(); 28 const si_int t = a >> (N - 1); 29 return (a ^ t) - t; 30 } 31
