1 /*===-- absvdi2.c - Implement __absvdi2 -----------------------------------===
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 __absvdi2 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 di_int
__absvdi2(di_int a)23 __absvdi2(di_int a)
24 {
25 const int N = (int)(sizeof(di_int) * CHAR_BIT);
26 if (a == ((di_int)1 << (N-1)))
27 abort();
28 const di_int t = a >> (N - 1);
29 return (a ^ t) - t;
30 }
31