compiler-rt/lib/addvsi3.c

//===-- addvsi3.c - Implement __addvsi3 -----------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements __addvsi3 for the compiler_rt library.
//
//===----------------------------------------------------------------------===//

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

// Returns: a + b

// Effects: aborts if a + b overflows

si_int
__addvsi3(si_int a, si_int b)
{
    si_int s = a + b;
    if (b >= 0)
    {
        if (s < a)
            abort();
    }
    else
    {
        if (s >= a)
            abort();
    }
    return s;
}