1 /* ===-- negvsi2.c - Implement __negvsi2 -----------------------------------===
2 *
3 * The LLVM Compiler Infrastructure
4 *
5 * This file is distributed under the University of Illinois Open Source
6 * License. See LICENSE.TXT for details.
7 *
8 * ===----------------------------------------------------------------------===
9 *
10 * This file implements __negvsi2 for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15 #include "int_lib.h"
16 #include <stdlib.h>
17
18 /* Returns: -a */
19
20 /* Effects: aborts if -a overflows */
21
22 si_int
__negvsi2(si_int a)23 __negvsi2(si_int a)
24 {
25 const si_int MIN = (si_int)1 << ((int)(sizeof(si_int) * CHAR_BIT)-1);
26 if (a == MIN)
27 abort();
28 return -a;
29 }
30