1/* ===-- absvti2.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 __absvti2 for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15#include "int_lib.h"
16
17#ifdef CRT_HAS_128BIT
18
19/* Returns: absolute value */
20
21/* Effects: aborts if abs(x) < 0 */
22
23COMPILER_RT_ABI ti_int
24__absvti2(ti_int a)
25{
26    const int N = (int)(sizeof(ti_int) * CHAR_BIT);
27    if (a == ((ti_int)1 << (N-1)))
28        compilerrt_abort();
29    const ti_int s = a >> (N - 1);
30    return (a ^ s) - s;
31}
32
33#endif /* CRT_HAS_128BIT */
34
35