1 /* ===-- absvti2.c - Implement __absvdi2 -----------------------------------=== 2 * 3 * The LLVM Compiler Infrastructure 4 * 5 * This file is distributed under the University of Illinois Open Source 6 * License. See LICENSE.TXT for details. 7 * 8 * ===----------------------------------------------------------------------=== 9 * 10 * This file implements __absvti2 for the compiler_rt library. 11 * 12 * ===----------------------------------------------------------------------=== 13 */ 14 15 #if __x86_64 16 17 #include "int_lib.h" 18 #include <stdlib.h> 19 20 /* Returns: absolute value */ 21 22 /* Effects: aborts if abs(x) < 0 */ 23 24 ti_int 25 __absvti2(ti_int a) 26 { 27 const int N = (int)(sizeof(ti_int) * CHAR_BIT); 28 if (a == ((ti_int)1 << (N-1))) 29 abort(); 30 const ti_int s = a >> (N - 1); 31 return (a ^ s) - s; 32 } 33 34 #endif 35
