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      1 /* ===-- negvsi2.c - Implement __negvsi2 -----------------------------------===
      2  *
      3  *                     The LLVM Compiler Infrastructure
      4  *
      5  * This file is dual licensed under the MIT and the University of Illinois Open
      6  * Source Licenses. See LICENSE.TXT for details.
      7  *
      8  * ===----------------------------------------------------------------------===
      9  *
     10  * This file implements __negvsi2 for the compiler_rt library.
     11  *
     12  * ===----------------------------------------------------------------------===
     13  */
     14 
     15 #include "int_lib.h"
     16 
     17 /* Returns: -a */
     18 
     19 /* Effects: aborts if -a overflows */
     20 
     21 COMPILER_RT_ABI si_int
     22 __negvsi2(si_int a)
     23 {
     24     const si_int MIN = (si_int)1 << ((int)(sizeof(si_int) * CHAR_BIT)-1);
     25     if (a == MIN)
     26         compilerrt_abort();
     27     return -a;
     28 }
     29