1 /* ===-- absvsi2.c - Implement __absvsi2 -----------------------------------=== 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 __absvsi2 for the compiler_rt library. 11 * 12 * ===----------------------------------------------------------------------=== 13 */ 14 15 #include "int_lib.h" 16 17 /* Returns: absolute value */ 18 19 /* Effects: aborts if abs(x) < 0 */ 20 21 COMPILER_RT_ABI si_int 22 __absvsi2(si_int a) 23 { 24 const int N = (int)(sizeof(si_int) * CHAR_BIT); 25 if (a == (1 << (N-1))) 26 compilerrt_abort(); 27 const si_int t = a >> (N - 1); 28 return (a ^ t) - t; 29 } 30
