t_bitops.c revision 272458
1/* $NetBSD: t_bitops.c,v 1.16 2012/12/07 02:28:19 christos Exp $ */ 2 3/*- 4 * Copyright (c) 2011, 2012 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas and Jukka Ruohonen. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * 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 the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31#include <sys/cdefs.h> 32__RCSID("$NetBSD: t_bitops.c,v 1.16 2012/12/07 02:28:19 christos Exp $"); 33 34#include <atf-c.h> 35 36#include <sys/cdefs.h> 37#include <sys/bitops.h> 38 39#include <math.h> 40#include <inttypes.h> 41#include <stdlib.h> 42#include <string.h> 43 44static const struct { 45 uint32_t val; 46 int ffs; 47 int fls; 48} bits[] = { 49 50 { 0x00, 0, 0 }, { 0x01, 1, 1 }, { 0x02, 2, 2 }, { 0x03, 1, 2 }, 51 { 0x04, 3, 3 }, { 0x05, 1, 3 }, { 0x06, 2, 3 }, { 0x07, 1, 3 }, 52 { 0x08, 4, 4 }, { 0x09, 1, 4 }, { 0x0A, 2, 4 }, { 0x0B, 1, 4 }, 53 { 0x0C, 3, 4 }, { 0x0D, 1, 4 }, { 0x0E, 2, 4 }, { 0x0F, 1, 4 }, 54 55 { 0x10, 5, 5 }, { 0x11, 1, 5 }, { 0x12, 2, 5 }, { 0x13, 1, 5 }, 56 { 0x14, 3, 5 }, { 0x15, 1, 5 }, { 0x16, 2, 5 }, { 0x17, 1, 5 }, 57 { 0x18, 4, 5 }, { 0x19, 1, 5 }, { 0x1A, 2, 5 }, { 0x1B, 1, 5 }, 58 { 0x1C, 3, 5 }, { 0x1D, 1, 5 }, { 0x1E, 2, 5 }, { 0x1F, 1, 5 }, 59 60 { 0xF0, 5, 8 }, { 0xF1, 1, 8 }, { 0xF2, 2, 8 }, { 0xF3, 1, 8 }, 61 { 0xF4, 3, 8 }, { 0xF5, 1, 8 }, { 0xF6, 2, 8 }, { 0xF7, 1, 8 }, 62 { 0xF8, 4, 8 }, { 0xF9, 1, 8 }, { 0xFA, 2, 8 }, { 0xFB, 1, 8 }, 63 { 0xFC, 3, 8 }, { 0xFD, 1, 8 }, { 0xFE, 2, 8 }, { 0xFF, 1, 8 }, 64 65}; 66 67ATF_TC(bitmap_basic); 68ATF_TC_HEAD(bitmap_basic, tc) 69{ 70 atf_tc_set_md_var(tc, "descr", "A basic test of __BITMAP_*"); 71} 72 73ATF_TC_BODY(bitmap_basic, tc) 74{ 75 __BITMAP_TYPE(, uint32_t, 65536) bm; 76 __BITMAP_ZERO(&bm); 77 78 ATF_REQUIRE(__BITMAP_SIZE(uint32_t, 65536) == 2048); 79 80 ATF_REQUIRE(__BITMAP_SHIFT(uint32_t) == 5); 81 82 ATF_REQUIRE(__BITMAP_MASK(uint32_t) == 31); 83 84 for (size_t i = 0; i < 65536; i += 2) 85 __BITMAP_SET(i, &bm); 86 87 for (size_t i = 0; i < 2048; i++) 88 ATF_REQUIRE(bm._b[i] == 0x55555555); 89 90 for (size_t i = 0; i < 65536; i++) 91 if (i & 1) 92 ATF_REQUIRE(!__BITMAP_ISSET(i, &bm)); 93 else { 94 ATF_REQUIRE(__BITMAP_ISSET(i, &bm)); 95 __BITMAP_CLR(i, &bm); 96 } 97 98 for (size_t i = 0; i < 65536; i += 2) 99 ATF_REQUIRE(!__BITMAP_ISSET(i, &bm)); 100} 101 102ATF_TC(fast_divide32); 103ATF_TC_HEAD(fast_divide32, tc) 104{ 105 atf_tc_set_md_var(tc, "descr", "A basic test of fast_divide32(3)"); 106} 107 108ATF_TC_BODY(fast_divide32, tc) 109{ 110 uint32_t a, b, q, r, m; 111 uint8_t i, s1, s2; 112 113 a = 0xFFFF; 114 b = 0x000F; 115 116 fast_divide32_prepare(b, &m, &s1, &s2); 117 118 q = fast_divide32(a, b, m, s1, s2); 119 r = fast_remainder32(a, b, m, s1, s2); 120 121 ATF_REQUIRE(q == 0x1111 && r == 0); 122 123 for (i = 1; i < __arraycount(bits); i++) { 124 125 a = bits[i].val; 126 b = bits[i].ffs; 127 128 fast_divide32_prepare(b, &m, &s1, &s2); 129 130 q = fast_divide32(a, b, m, s1, s2); 131 r = fast_remainder32(a, b, m, s1, s2); 132 133 ATF_REQUIRE(q == a / b); 134 ATF_REQUIRE(r == a % b); 135 } 136} 137 138ATF_TC(ffsfls); 139ATF_TC_HEAD(ffsfls, tc) 140{ 141 atf_tc_set_md_var(tc, "descr", "Test ffs32(3)-family for correctness"); 142} 143 144ATF_TC_BODY(ffsfls, tc) 145{ 146 uint8_t i; 147 148 ATF_REQUIRE(ffs32(0) == 0x00); 149 ATF_REQUIRE(fls32(0) == 0x00); 150 ATF_REQUIRE(ffs64(0) == 0x00); 151 ATF_REQUIRE(fls64(0) == 0x00); 152 153 ATF_REQUIRE(ffs32(UINT32_MAX) == 0x01); 154 ATF_REQUIRE(fls32(UINT32_MAX) == 0x20); 155 ATF_REQUIRE(ffs64(UINT64_MAX) == 0x01); 156 ATF_REQUIRE(fls64(UINT64_MAX) == 0x40); 157 158 for (i = 1; i < __arraycount(bits); i++) { 159 160 ATF_REQUIRE(ffs32(bits[i].val) == bits[i].ffs); 161 ATF_REQUIRE(fls32(bits[i].val) == bits[i].fls); 162 ATF_REQUIRE(ffs64(bits[i].val) == bits[i].ffs); 163 ATF_REQUIRE(fls64(bits[i].val) == bits[i].fls); 164 165 ATF_REQUIRE(ffs32(bits[i].val << 1) == bits[i].ffs + 1); 166 ATF_REQUIRE(fls32(bits[i].val << 1) == bits[i].fls + 1); 167 ATF_REQUIRE(ffs64(bits[i].val << 1) == bits[i].ffs + 1); 168 ATF_REQUIRE(fls64(bits[i].val << 1) == bits[i].fls + 1); 169 170 ATF_REQUIRE(ffs32(bits[i].val << 9) == bits[i].ffs + 9); 171 ATF_REQUIRE(fls32(bits[i].val << 9) == bits[i].fls + 9); 172 ATF_REQUIRE(ffs64(bits[i].val << 9) == bits[i].ffs + 9); 173 ATF_REQUIRE(fls64(bits[i].val << 9) == bits[i].fls + 9); 174 } 175} 176 177ATF_TC(ilog2_basic); 178ATF_TC_HEAD(ilog2_basic, tc) 179{ 180 atf_tc_set_md_var(tc, "descr", "Test ilog2(3) for correctness"); 181} 182 183ATF_TC_BODY(ilog2_basic, tc) 184{ 185 uint64_t i, x; 186 187 for (i = x = 0; i < 64; i++) { 188 189 x = (uint64_t)1 << i; 190 191 ATF_REQUIRE(i == (uint64_t)ilog2(x)); 192 } 193} 194 195ATF_TC(ilog2_log2); 196ATF_TC_HEAD(ilog2_log2, tc) 197{ 198 atf_tc_set_md_var(tc, "descr", "Test log2(3) vs. ilog2(3)"); 199} 200 201ATF_TC_BODY(ilog2_log2, tc) 202{ 203#ifdef __vax__ 204 atf_tc_skip("Test is unavailable on vax because of lack of log2()"); 205#else 206 double x, y; 207 uint64_t i; 208 209 /* 210 * This may fail under QEMU; see PR misc/44767. 211 */ 212 for (i = 1; i < UINT32_MAX; i += UINT16_MAX) { 213 214 x = log2(i); 215 y = (double)(ilog2(i)); 216 217 ATF_REQUIRE(ceil(x) >= y); 218 219 if (fabs(floor(x) - y) > 1.0e-40) { 220 atf_tc_expect_fail("PR misc/44767"); 221 atf_tc_fail("log2(%"PRIu64") != " 222 "ilog2(%"PRIu64")", i, i); 223 } 224 } 225#endif 226} 227 228ATF_TP_ADD_TCS(tp) 229{ 230 231 ATF_TP_ADD_TC(tp, bitmap_basic); 232 ATF_TP_ADD_TC(tp, fast_divide32); 233 ATF_TP_ADD_TC(tp, ffsfls); 234 ATF_TP_ADD_TC(tp, ilog2_basic); 235 ATF_TP_ADD_TC(tp, ilog2_log2); 236 237 return atf_no_error(); 238} 239