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 
23 COMPILER_RT_ABI ti_int
__absvti2(ti_int a)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