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1 /*===-- absvdi2.c - Implement __absvdi2 -----------------------------------===
2  *
3  *                     The LLVM Compiler Infrastructure
4  *
5  * This file is dual licensed under the MIT and the University of Illinois Open
6  * Source Licenses. 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 
17 /* Returns: absolute value */
18 
19 /* Effects: aborts if abs(x) < 0 */
20 
21 COMPILER_RT_ABI di_int
__absvdi2(di_int a)22 __absvdi2(di_int a)
23 {
24     const int N = (int)(sizeof(di_int) * CHAR_BIT);
25     if (a == ((di_int)1 << (N-1)))
26         compilerrt_abort();
27     const di_int t = a >> (N - 1);
28     return (a ^ t) - t;
29 }
30