lib/builtins/negvsi2.c

/* ===-- negvsi2.c - Implement __negvsi2 -----------------------------------===
 *
 * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 * See https://llvm.org/LICENSE.txt for license information.
 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 *
 * ===----------------------------------------------------------------------===
 *
 * This file implements __negvsi2 for the compiler_rt library.
 *
 * ===----------------------------------------------------------------------===
 */

#include "int_lib.h"

/* Returns: -a */

/* Effects: aborts if -a overflows */

COMPILER_RT_ABI si_int
__negvsi2(si_int a)
{
    const si_int MIN = (si_int)1 << ((int)(sizeof(si_int) * CHAR_BIT)-1);
    if (a == MIN)
        compilerrt_abort();
    return -a;
}