llvm-project/compiler-rt/lib/builtins/negvti2.c

/*===-- negvti2.c - Implement __negvti2 -----------------------------------===
 *
 * 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 __negvti2 for the compiler_rt library.
 *
 *===----------------------------------------------------------------------===
 */

#include "int_lib.h"

#ifdef CRT_HAS_128BIT

/* Returns: -a */

/* Effects: aborts if -a overflows */

COMPILER_RT_ABI ti_int
__negvti2(ti_int a)
{
    const ti_int MIN = (ti_int)1 << ((int)(sizeof(ti_int) * CHAR_BIT)-1);
    if (a == MIN)
        compilerrt_abort();
    return -a;
}

#endif /* CRT_HAS_128BIT */