compiler-rt/lib/addvti3.c

//===-- addvti3.c - Implement __addvti3 -----------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements __addvti3 for the compiler_rt library.
//
//===----------------------------------------------------------------------===//

#if __x86_64

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

// Returns: a + b

// Effects: aborts if a + b overflows

ti_int
__addvti3(ti_int a, ti_int b)
{
    ti_int s = a + b;
    if (b >= 0)
    {
        if (s < a)
            abort();
    }
    else
    {
        if (s >= a)
            abort();
    }
    return s;
}

#endif