1 /* ===-- absvti2.c - Implement __absvdi2 -----------------------------------===
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 __absvti2 for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15 #include "int_lib.h"
16
17 #if __x86_64
18
19 /* Returns: absolute value */
20
21 /* Effects: aborts if abs(x) < 0 */
22
23 ti_int
__absvti2(ti_int a)24 __absvti2(ti_int a)
25 {
26 const int N = (int)(sizeof(ti_int) * CHAR_BIT);
27 if (a == ((ti_int)1 << (N-1)))
28 compilerrt_abort();
29 const ti_int s = a >> (N - 1);
30 return (a ^ s) - s;
31 }
32
33 #endif
34