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 __negvsi2(si_int a)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