1/* ===-- paritysi2.c - Implement __paritysi2 -------------------------------===
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 __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
19si_int
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