lib/builtins/addvdi3.c


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/* ===-- addvdi3.c - Implement __addvdi3 -----------------------------------===
 *
 *                     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 __addvdi3 for the compiler_rt library.
 *
 * ===----------------------------------------------------------------------===
 */

#include "int_lib.h"

/* Returns: a + b */

/* Effects: aborts if a + b overflows */

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