Fix an #ifdef botch in rev 1.214 that causes
[netbsd-mini2440.git] / lib / libc / string / popcountll.c
blob90cf229c4ab90046f8f284dec8f9ccfc51f77374
1 /* $NetBSD: mi_vector_hash.c,v 1.1 2009/07/20 17:03:37 joerg Exp $ */
2 /*-
3 * Copyright (c) 2009 The NetBSD Foundation, Inc.
4 * All rights reserved.
6 * This code is derived from software contributed to The NetBSD Foundation
7 * by Joerg Sonnenberger.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
34 #include <sys/cdefs.h>
35 __RCSID("$NetBSD: mi_vector_hash.c,v 1.1 2009/07/20 17:03:37 joerg Exp $");
37 #include <strings.h>
39 #if ULONGLONG_MAX > 0xffffffffffffffffULL
40 #error "Unsupported architecture"
41 #endif
44 * If unsigned long long is larger than size_t, the follow assumes that
45 * splitting into 32bit halfes is faster.
47 * The native pocountll version is based on the same ideas as popcount(3),
48 * see popcount.c for comments.
51 #if ULONGLONG_MAX > SIZE_MAX
52 unsigned int
53 popcountll(unsigned long long v)
55 return popcount(v >> 32) + popcount(v & 0xffffffffU);
57 #else
58 unsigned int
59 popcountll(unsigned long long v)
61 unsigned int c;
63 v = v - ((v >> 1) & 0x5555555555555555ULL);
64 v = (v & 0x3333333333333333ULL) + ((v >> 2) & 0x3333333333333333ULL);
65 v = ((v + (v >> 4)) & 0x0f0f0f0f0f0f0f0fULL) * 0x0101010101010101ULL;
66 c = v >> 56;
68 return c;
70 #endif