lib/addvdi3.c

//===-- addvdi3.c - Implement __addvdi3 -----------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements __addvdi3 for the compiler_rt library.
//
//===----------------------------------------------------------------------===//

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

// Returns: a + b

// Effects: aborts if a + b overflows

di_int
__addvdi3(di_int a, di_int b)
{
    di_int s = a + b;
    if (b >= 0)
    {
        if (s < a)
            abort();
    }
    else
    {
        if (s >= a)
            abort();
    }
    return s;
}