negvsi2.c revision 276789 
1276789Sdim/* ===-- negvsi2.c - Implement __negvsi2 -----------------------------------===
2276789Sdim *
3276789Sdim *                     The LLVM Compiler Infrastructure
4276789Sdim *
5276789Sdim * This file is dual licensed under the MIT and the University of Illinois Open
6276789Sdim * Source Licenses. See LICENSE.TXT for details.
7276789Sdim *
8276789Sdim * ===----------------------------------------------------------------------===
9276789Sdim *
10276789Sdim * This file implements __negvsi2 for the compiler_rt library.
11276789Sdim *
12276789Sdim * ===----------------------------------------------------------------------===
13276789Sdim */
14276789Sdim
15276789Sdim#include "int_lib.h"
16276789Sdim
17276789Sdim/* Returns: -a */
18276789Sdim
19276789Sdim/* Effects: aborts if -a overflows */
20276789Sdim
21276789SdimCOMPILER_RT_ABI si_int
22276789Sdim__negvsi2(si_int a)
23276789Sdim{
24276789Sdim    const si_int MIN = (si_int)1 << ((int)(sizeof(si_int) * CHAR_BIT)-1);
25276789Sdim    if (a == MIN)
26276789Sdim        compilerrt_abort();
27276789Sdim    return -a;
28276789Sdim}
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