negvti2.c revision 2d1fdb26e458c4ddc04155c1d421bced3ba90cd0 
1/*===-- negvti2.c - Implement __negvti2 -----------------------------------===
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 __negvti2 for the compiler_rt library.
11 *
12 *===----------------------------------------------------------------------===
13 */
14
15#include "int_lib.h"
16
17#ifdef CRT_HAS_128BIT
18
19/* Returns: -a */
20
21/* Effects: aborts if -a overflows */
22
23COMPILER_RT_ABI ti_int
24__negvti2(ti_int a)
25{
26    const ti_int MIN = (ti_int)1 << ((int)(sizeof(ti_int) * CHAR_BIT)-1);
27    if (a == MIN)
28        compilerrt_abort();
29    return -a;
30}
31
32#endif /* CRT_HAS_128BIT */
33