1214152Sed/* ===-- absvti2.c - Implement __absvdi2 -----------------------------------===
2214152Sed *
3214152Sed *                     The LLVM Compiler Infrastructure
4214152Sed *
5222656Sed * This file is dual licensed under the MIT and the University of Illinois Open
6222656Sed * Source Licenses. See LICENSE.TXT for details.
7214152Sed *
8214152Sed * ===----------------------------------------------------------------------===
9214152Sed *
10214152Sed * This file implements __absvti2 for the compiler_rt library.
11214152Sed *
12214152Sed * ===----------------------------------------------------------------------===
13214152Sed */
14214152Sed
15239138Sandrew#include "int_lib.h"
16239138Sandrew
17263763Sdim#ifdef CRT_HAS_128BIT
18214152Sed
19214152Sed/* Returns: absolute value */
20214152Sed
21214152Sed/* Effects: aborts if abs(x) < 0 */
22214152Sed
23214152Sedti_int
24214152Sed__absvti2(ti_int a)
25214152Sed{
26214152Sed    const int N = (int)(sizeof(ti_int) * CHAR_BIT);
27214152Sed    if (a == ((ti_int)1 << (N-1)))
28214152Sed        compilerrt_abort();
29214152Sed    const ti_int s = a >> (N - 1);
30214152Sed    return (a ^ s) - s;
31214152Sed}
32214152Sed
33263763Sdim#endif /* CRT_HAS_128BIT */
34263763Sdim
35