tests/include/sys/t_bitops.c

   1 /*      $NetBSD: t_bitops.c,v 1.19 2015/03/21 05:50:19 isaki 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 1.19 2015/03/21 05:50:19 isaki 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
  44 static 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
  67 ATF_TC(bitmap_basic);
  68 ATF_TC_HEAD(bitmap_basic, tc)
  69 {
  70         atf_tc_set_md_var(tc, "descr", "A basic test of __BITMAP_*");
  71 }
  72
  73 ATF_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
 102 ATF_TC(fast_divide32);
 103 ATF_TC_HEAD(fast_divide32, tc)
 104 {
 105         atf_tc_set_md_var(tc, "descr", "A basic test of fast_divide32(3)");
 106 }
 107
 108 ATF_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
 138 ATF_TC(ffsfls);
 139 ATF_TC_HEAD(ffsfls, tc)
 140 {
 141         atf_tc_set_md_var(tc, "descr", "Test ffs32(3)-family for correctness");
 142 }
 143
 144 ATF_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
 177 ATF_TC(ilog2_32bit);
 178 ATF_TC_HEAD(ilog2_32bit, tc)
 179 {
 180         atf_tc_set_md_var(tc, "descr", "Test ilog2(3) for 32bit variable");
 181 }
 182
 183 ATF_TC_BODY(ilog2_32bit, tc)
 184 {
 185         int i;
 186         uint32_t x;
 187
 188         for (i = 0; i < 32; i++) {
 189                 x = 1 << i;
 190                 ATF_REQUIRE(ilog2(x) == i);
 191         }
 192 }
 193
 194 ATF_TC(ilog2_64bit);
 195 ATF_TC_HEAD(ilog2_64bit, tc)
 196 {
 197         atf_tc_set_md_var(tc, "descr", "Test ilog2(3) for 64bit variable");
 198 }
 199
 200 ATF_TC_BODY(ilog2_64bit, tc)
 201 {
 202         int i;
 203         uint64_t x;
 204
 205         for (i = 0; i < 64; i++) {
 206                 x = ((uint64_t)1) << i;
 207                 ATF_REQUIRE(ilog2(x) == i);
 208         }
 209 }
 210
 211 ATF_TC(ilog2_const);
 212 ATF_TC_HEAD(ilog2_const, tc)
 213 {
 214         atf_tc_set_md_var(tc, "descr", "Test ilog2(3) for constant");
 215 }
 216
 217 ATF_TC_BODY(ilog2_const, tc)
 218 {
 219         /*
 220          * These inlines test __builtin_constant_p() part of ilog2()
 221          * at compile time, so don't change it to loop.  PR lib/49745
 222          */
 223         ATF_REQUIRE(ilog2(0x0000000000000001ULL) == 0);
 224         ATF_REQUIRE(ilog2(0x0000000000000002ULL) == 1);
 225         ATF_REQUIRE(ilog2(0x0000000000000004ULL) == 2);
 226         ATF_REQUIRE(ilog2(0x0000000000000008ULL) == 3);
 227         ATF_REQUIRE(ilog2(0x0000000000000010ULL) == 4);
 228         ATF_REQUIRE(ilog2(0x0000000000000020ULL) == 5);
 229         ATF_REQUIRE(ilog2(0x0000000000000040ULL) == 6);
 230         ATF_REQUIRE(ilog2(0x0000000000000080ULL) == 7);
 231         ATF_REQUIRE(ilog2(0x0000000000000100ULL) == 8);
 232         ATF_REQUIRE(ilog2(0x0000000000000200ULL) == 9);
 233         ATF_REQUIRE(ilog2(0x0000000000000400ULL) == 10);
 234         ATF_REQUIRE(ilog2(0x0000000000000800ULL) == 11);
 235         ATF_REQUIRE(ilog2(0x0000000000001000ULL) == 12);
 236         ATF_REQUIRE(ilog2(0x0000000000002000ULL) == 13);
 237         ATF_REQUIRE(ilog2(0x0000000000004000ULL) == 14);
 238         ATF_REQUIRE(ilog2(0x0000000000008000ULL) == 15);
 239         ATF_REQUIRE(ilog2(0x0000000000010000ULL) == 16);
 240         ATF_REQUIRE(ilog2(0x0000000000020000ULL) == 17);
 241         ATF_REQUIRE(ilog2(0x0000000000040000ULL) == 18);
 242         ATF_REQUIRE(ilog2(0x0000000000080000ULL) == 19);
 243         ATF_REQUIRE(ilog2(0x0000000000100000ULL) == 20);
 244         ATF_REQUIRE(ilog2(0x0000000000200000ULL) == 21);
 245         ATF_REQUIRE(ilog2(0x0000000000400000ULL) == 22);
 246         ATF_REQUIRE(ilog2(0x0000000000800000ULL) == 23);
 247         ATF_REQUIRE(ilog2(0x0000000001000000ULL) == 24);
 248         ATF_REQUIRE(ilog2(0x0000000002000000ULL) == 25);
 249         ATF_REQUIRE(ilog2(0x0000000004000000ULL) == 26);
 250         ATF_REQUIRE(ilog2(0x0000000008000000ULL) == 27);
 251         ATF_REQUIRE(ilog2(0x0000000010000000ULL) == 28);
 252         ATF_REQUIRE(ilog2(0x0000000020000000ULL) == 29);
 253         ATF_REQUIRE(ilog2(0x0000000040000000ULL) == 30);
 254         ATF_REQUIRE(ilog2(0x0000000080000000ULL) == 31);
 255         ATF_REQUIRE(ilog2(0x0000000100000000ULL) == 32);
 256         ATF_REQUIRE(ilog2(0x0000000200000000ULL) == 33);
 257         ATF_REQUIRE(ilog2(0x0000000400000000ULL) == 34);
 258         ATF_REQUIRE(ilog2(0x0000000800000000ULL) == 35);
 259         ATF_REQUIRE(ilog2(0x0000001000000000ULL) == 36);
 260         ATF_REQUIRE(ilog2(0x0000002000000000ULL) == 37);
 261         ATF_REQUIRE(ilog2(0x0000004000000000ULL) == 38);
 262         ATF_REQUIRE(ilog2(0x0000008000000000ULL) == 39);
 263         ATF_REQUIRE(ilog2(0x0000010000000000ULL) == 40);
 264         ATF_REQUIRE(ilog2(0x0000020000000000ULL) == 41);
 265         ATF_REQUIRE(ilog2(0x0000040000000000ULL) == 42);
 266         ATF_REQUIRE(ilog2(0x0000080000000000ULL) == 43);
 267         ATF_REQUIRE(ilog2(0x0000100000000000ULL) == 44);
 268         ATF_REQUIRE(ilog2(0x0000200000000000ULL) == 45);
 269         ATF_REQUIRE(ilog2(0x0000400000000000ULL) == 46);
 270         ATF_REQUIRE(ilog2(0x0000800000000000ULL) == 47);
 271         ATF_REQUIRE(ilog2(0x0001000000000000ULL) == 48);
 272         ATF_REQUIRE(ilog2(0x0002000000000000ULL) == 49);
 273         ATF_REQUIRE(ilog2(0x0004000000000000ULL) == 50);
 274         ATF_REQUIRE(ilog2(0x0008000000000000ULL) == 51);
 275         ATF_REQUIRE(ilog2(0x0010000000000000ULL) == 52);
 276         ATF_REQUIRE(ilog2(0x0020000000000000ULL) == 53);
 277         ATF_REQUIRE(ilog2(0x0040000000000000ULL) == 54);
 278         ATF_REQUIRE(ilog2(0x0080000000000000ULL) == 55);
 279         ATF_REQUIRE(ilog2(0x0100000000000000ULL) == 56);
 280         ATF_REQUIRE(ilog2(0x0200000000000000ULL) == 57);
 281         ATF_REQUIRE(ilog2(0x0400000000000000ULL) == 58);
 282         ATF_REQUIRE(ilog2(0x0800000000000000ULL) == 59);
 283         ATF_REQUIRE(ilog2(0x1000000000000000ULL) == 60);
 284         ATF_REQUIRE(ilog2(0x2000000000000000ULL) == 61);
 285         ATF_REQUIRE(ilog2(0x4000000000000000ULL) == 62);
 286         ATF_REQUIRE(ilog2(0x8000000000000000ULL) == 63);
 287
 288         ATF_REQUIRE(ilog2(0x0000000000000003ULL) == 1);
 289         ATF_REQUIRE(ilog2(0x0000000000000007ULL) == 2);
 290         ATF_REQUIRE(ilog2(0x000000000000000fULL) == 3);
 291         ATF_REQUIRE(ilog2(0x000000000000001fULL) == 4);
 292         ATF_REQUIRE(ilog2(0x000000000000003fULL) == 5);
 293         ATF_REQUIRE(ilog2(0x000000000000007fULL) == 6);
 294         ATF_REQUIRE(ilog2(0x00000000000000ffULL) == 7);
 295         ATF_REQUIRE(ilog2(0x00000000000001ffULL) == 8);
 296         ATF_REQUIRE(ilog2(0x00000000000003ffULL) == 9);
 297         ATF_REQUIRE(ilog2(0x00000000000007ffULL) == 10);
 298         ATF_REQUIRE(ilog2(0x0000000000000fffULL) == 11);
 299         ATF_REQUIRE(ilog2(0x0000000000001fffULL) == 12);
 300         ATF_REQUIRE(ilog2(0x0000000000003fffULL) == 13);
 301         ATF_REQUIRE(ilog2(0x0000000000007fffULL) == 14);
 302         ATF_REQUIRE(ilog2(0x000000000000ffffULL) == 15);
 303         ATF_REQUIRE(ilog2(0x000000000001ffffULL) == 16);
 304         ATF_REQUIRE(ilog2(0x000000000003ffffULL) == 17);
 305         ATF_REQUIRE(ilog2(0x000000000007ffffULL) == 18);
 306         ATF_REQUIRE(ilog2(0x00000000000fffffULL) == 19);
 307         ATF_REQUIRE(ilog2(0x00000000001fffffULL) == 20);
 308         ATF_REQUIRE(ilog2(0x00000000003fffffULL) == 21);
 309         ATF_REQUIRE(ilog2(0x00000000007fffffULL) == 22);
 310         ATF_REQUIRE(ilog2(0x0000000000ffffffULL) == 23);
 311         ATF_REQUIRE(ilog2(0x0000000001ffffffULL) == 24);
 312         ATF_REQUIRE(ilog2(0x0000000003ffffffULL) == 25);
 313         ATF_REQUIRE(ilog2(0x0000000007ffffffULL) == 26);
 314         ATF_REQUIRE(ilog2(0x000000000fffffffULL) == 27);
 315         ATF_REQUIRE(ilog2(0x000000001fffffffULL) == 28);
 316         ATF_REQUIRE(ilog2(0x000000003fffffffULL) == 29);
 317         ATF_REQUIRE(ilog2(0x000000007fffffffULL) == 30);
 318         ATF_REQUIRE(ilog2(0x00000000ffffffffULL) == 31);
 319         ATF_REQUIRE(ilog2(0x00000001ffffffffULL) == 32);
 320         ATF_REQUIRE(ilog2(0x00000003ffffffffULL) == 33);
 321         ATF_REQUIRE(ilog2(0x00000007ffffffffULL) == 34);
 322         ATF_REQUIRE(ilog2(0x0000000fffffffffULL) == 35);
 323         ATF_REQUIRE(ilog2(0x0000001fffffffffULL) == 36);
 324         ATF_REQUIRE(ilog2(0x0000003fffffffffULL) == 37);
 325         ATF_REQUIRE(ilog2(0x0000007fffffffffULL) == 38);
 326         ATF_REQUIRE(ilog2(0x000000ffffffffffULL) == 39);
 327         ATF_REQUIRE(ilog2(0x000001ffffffffffULL) == 40);
 328         ATF_REQUIRE(ilog2(0x000003ffffffffffULL) == 41);
 329         ATF_REQUIRE(ilog2(0x000007ffffffffffULL) == 42);
 330         ATF_REQUIRE(ilog2(0x00000fffffffffffULL) == 43);
 331         ATF_REQUIRE(ilog2(0x00001fffffffffffULL) == 44);
 332         ATF_REQUIRE(ilog2(0x00003fffffffffffULL) == 45);
 333         ATF_REQUIRE(ilog2(0x00007fffffffffffULL) == 46);
 334         ATF_REQUIRE(ilog2(0x0000ffffffffffffULL) == 47);
 335         ATF_REQUIRE(ilog2(0x0001ffffffffffffULL) == 48);
 336         ATF_REQUIRE(ilog2(0x0003ffffffffffffULL) == 49);
 337         ATF_REQUIRE(ilog2(0x0007ffffffffffffULL) == 50);
 338         ATF_REQUIRE(ilog2(0x000fffffffffffffULL) == 51);
 339         ATF_REQUIRE(ilog2(0x001fffffffffffffULL) == 52);
 340         ATF_REQUIRE(ilog2(0x003fffffffffffffULL) == 53);
 341         ATF_REQUIRE(ilog2(0x007fffffffffffffULL) == 54);
 342         ATF_REQUIRE(ilog2(0x00ffffffffffffffULL) == 55);
 343         ATF_REQUIRE(ilog2(0x01ffffffffffffffULL) == 56);
 344         ATF_REQUIRE(ilog2(0x03ffffffffffffffULL) == 57);
 345         ATF_REQUIRE(ilog2(0x07ffffffffffffffULL) == 58);
 346         ATF_REQUIRE(ilog2(0x0fffffffffffffffULL) == 59);
 347         ATF_REQUIRE(ilog2(0x1fffffffffffffffULL) == 60);
 348         ATF_REQUIRE(ilog2(0x3fffffffffffffffULL) == 61);
 349         ATF_REQUIRE(ilog2(0x7fffffffffffffffULL) == 62);
 350         ATF_REQUIRE(ilog2(0xffffffffffffffffULL) == 63);
 351 }
 352
 353 ATF_TP_ADD_TCS(tp)
 354 {
 355
 356         ATF_TP_ADD_TC(tp, bitmap_basic);
 357         ATF_TP_ADD_TC(tp, fast_divide32);
 358         ATF_TP_ADD_TC(tp, ffsfls);
 359         ATF_TP_ADD_TC(tp, ilog2_32bit);
 360         ATF_TP_ADD_TC(tp, ilog2_64bit);
 361         ATF_TP_ADD_TC(tp, ilog2_const);
 362
 363         return atf_no_error();
 364 }