blob: b9e93fef06c56e437b9ab10e3af0bfbd819b8c31 [file] [log] [blame]
Edward O'Callaghan2bf62722009-08-05 04:02:56 +00001/* ===-- negvsi2.c - Implement __negvsi2 -----------------------------------===
2 *
3 * The LLVM Compiler Infrastructure
4 *
Howard Hinnant9ad441f2010-11-16 22:13:33 +00005 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
Edward O'Callaghan2bf62722009-08-05 04:02:56 +00007 *
8 * ===----------------------------------------------------------------------===
9 *
10 * This file implements __negvsi2 for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
Daniel Dunbarb3a69012009-06-26 16:47:03 +000014
15#include "int_lib.h"
Daniel Dunbarb3a69012009-06-26 16:47:03 +000016
Edward O'Callaghan2bf62722009-08-05 04:02:56 +000017/* Returns: -a */
Daniel Dunbarb3a69012009-06-26 16:47:03 +000018
Edward O'Callaghan2bf62722009-08-05 04:02:56 +000019/* Effects: aborts if -a overflows */
Daniel Dunbarb3a69012009-06-26 16:47:03 +000020
Anton Korobeynikov1c5f89b2011-04-19 17:52:09 +000021COMPILER_RT_ABI si_int
Daniel Dunbarb3a69012009-06-26 16:47:03 +000022__negvsi2(si_int a)
23{
24 const si_int MIN = (si_int)1 << ((int)(sizeof(si_int) * CHAR_BIT)-1);
25 if (a == MIN)
Daniel Dunbar48f46ac2010-03-31 17:00:45 +000026 compilerrt_abort();
Daniel Dunbarb3a69012009-06-26 16:47:03 +000027 return -a;
28}