llvm-project/compiler-rt/lib/negvsi2.c

31 lines
807 B
C

/* ===-- negvsi2.c - Implement __negvsi2 -----------------------------------===
*
* The LLVM Compiler Infrastructure
*
* This file is dual licensed under the MIT and the University of Illinois Open
* Source Licenses. See LICENSE.TXT for details.
*
* ===----------------------------------------------------------------------===
*
* This file implements __negvsi2 for the compiler_rt library.
*
* ===----------------------------------------------------------------------===
*/
#include "abi.h"
#include "int_lib.h"
#include <stdlib.h>
/* Returns: -a */
/* Effects: aborts if -a overflows */
COMPILER_RT_ABI si_int
__negvsi2(si_int a)
{
const si_int MIN = (si_int)1 << ((int)(sizeof(si_int) * CHAR_BIT)-1);
if (a == MIN)
compilerrt_abort();
return -a;
}