1 /* ===-- paritysi2.c - Implement __paritysi2 -------------------------------===
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 __paritysi2 for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15 #include "int_lib.h"
16
17 /* Returns: 1 if number of bits is odd else returns 0 */
18
19 COMPILER_RT_ABI si_int
__paritysi2(si_int a)20 __paritysi2(si_int a)
21 {
22 su_int x = (su_int)a;
23 x ^= x >> 16;
24 x ^= x >> 8;
25 x ^= x >> 4;
26 return (0x6996 >> (x & 0xF)) & 1;
27 }
28