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
__absvti2(ti_int a)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