lib/builtins/negvti2.c

   1 /*===-- negvti2.c - Implement __negvti2 -----------------------------------===
   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 __negvti2 for the compiler_rt library.
  11  *
  12  *===----------------------------------------------------------------------===
  13  */
  14
  15 #include "int_lib.h"
  16
  17 #ifdef CRT_HAS_128BIT
  18
  19 /* Returns: -a */
  20
  21 /* Effects: aborts if -a overflows */
  22
  23 COMPILER_RT_ABI ti_int
  24 __negvti2(ti_int a)
  25 {
  26     const ti_int MIN = (ti_int)1 << ((int)(sizeof(ti_int) * CHAR_BIT)-1);
  27     if (a == MIN)
  28         compilerrt_abort();
  29     return -a;
  30 }
  31
  32 #endif /* CRT_HAS_128BIT */