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
22si_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