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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