lib/negvsi2.c

//===-- negvsi2.c - Implement __negvsi2 -----------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements __negvsi2 for the compiler_rt library.
//
//===----------------------------------------------------------------------===//

#include "int_lib.h"
#include <stdlib.h>

// Returns: -a

// Effects: aborts if -a overflows

si_int
__negvsi2(si_int a)
{
    const si_int MIN = (si_int)1 << ((int)(sizeof(si_int) * CHAR_BIT)-1);
    if (a == MIN)
        abort();
    return -a;
}