llvm-project/compiler-rt/lib/addvti3.c

/* ===-- addvti3.c - Implement __addvti3 -----------------------------------===
 *
 *                     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 __addvti3 for the compiler_rt library.
 *
 * ===----------------------------------------------------------------------===
 */

#if __x86_64

#include "int_lib.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)
            compilerrt_abort();
    }
    else
    {
        if (s >= a)
            compilerrt_abort();
    }
    return s;
}

#endif