negvdi2.c revision 2d1fdb26e458c4ddc04155c1d421bced3ba90cd0 
1/* ===-- negvdi2.c - Implement __negvdi2 -----------------------------------===
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 __negvdi2 for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15#include "int_lib.h"
16
17/* Returns: -a */
18
19/* Effects: aborts if -a overflows */
20
21COMPILER_RT_ABI di_int
22__negvdi2(di_int a)
23{
24    const di_int MIN = (di_int)1 << ((int)(sizeof(di_int) * CHAR_BIT)-1);
25    if (a == MIN)
26        compilerrt_abort();
27    return -a;
28}
29