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Edward O'Callaghan2bf62722009-08-05 04:02:56 +00001/* ===-- negvdi2.c - Implement __negvdi2 -----------------------------------===
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 __negvdi2 for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
Daniel Dunbarb3a69012009-06-26 16:47:03 +000014
15#include "int_lib.h"
16#include <stdlib.h>
17
Edward O'Callaghan2bf62722009-08-05 04:02:56 +000018/* Returns: -a */
Daniel Dunbarb3a69012009-06-26 16:47:03 +000019
Edward O'Callaghan2bf62722009-08-05 04:02:56 +000020/* Effects: aborts if -a overflows */
Daniel Dunbarb3a69012009-06-26 16:47:03 +000021
22di_int
23__negvdi2(di_int a)
24{
25 const di_int MIN = (di_int)1 << ((int)(sizeof(di_int) * CHAR_BIT)-1);
26 if (a == MIN)
Daniel Dunbar48f46ac2010-03-31 17:00:45 +000027 compilerrt_abort();
Daniel Dunbarb3a69012009-06-26 16:47:03 +000028 return -a;
29}