tests/test-bitcnt.c

   1 /*
   2  * Test bit count routines
   3  *
   4  * This work is licensed under the terms of the GNU LGPL, version 2 or later.
   5  * See the COPYING.LIB file in the top-level directory.
   6  *
   7  */
   8
   9 #include "qemu/osdep.h"
  10 #include "qemu/host-utils.h"
  11
  12 struct bitcnt_test_data {
  13     /* value to count */
  14     union {
  15         uint8_t  w8;
  16         uint16_t w16;
  17         uint32_t w32;
  18         uint64_t w64;
  19     } value;
  20     /* expected result */
  21     int popct;
  22 };
  23
  24 struct bitcnt_test_data eight_bit_data[] = {
  25     { { .w8 = 0x00 }, .popct=0 },
  26     { { .w8 = 0x01 }, .popct=1 },
  27     { { .w8 = 0x03 }, .popct=2 },
  28     { { .w8 = 0x04 }, .popct=1 },
  29     { { .w8 = 0x0f }, .popct=4 },
  30     { { .w8 = 0x3f }, .popct=6 },
  31     { { .w8 = 0x40 }, .popct=1 },
  32     { { .w8 = 0xf0 }, .popct=4 },
  33     { { .w8 = 0x7f }, .popct=7 },
  34     { { .w8 = 0x80 }, .popct=1 },
  35     { { .w8 = 0xf1 }, .popct=5 },
  36     { { .w8 = 0xfe }, .popct=7 },
  37     { { .w8 = 0xff }, .popct=8 },
  38 };
  39
  40 static void test_ctpop8(void)
  41 {
  42     int i;
  43
  44     for (i = 0; i < ARRAY_SIZE(eight_bit_data); i++) {
  45         struct bitcnt_test_data *d = &eight_bit_data[i];
  46         g_assert(ctpop8(d->value.w8)==d->popct);
  47     }
  48 }
  49
  50 struct bitcnt_test_data sixteen_bit_data[] = {
  51     { { .w16 = 0x0000 }, .popct=0 },
  52     { { .w16 = 0x0001 }, .popct=1 },
  53     { { .w16 = 0x0003 }, .popct=2 },
  54     { { .w16 = 0x000f }, .popct=4 },
  55     { { .w16 = 0x003f }, .popct=6 },
  56     { { .w16 = 0x00f0 }, .popct=4 },
  57     { { .w16 = 0x0f0f }, .popct=8 },
  58     { { .w16 = 0x1f1f }, .popct=10 },
  59     { { .w16 = 0x4000 }, .popct=1 },
  60     { { .w16 = 0x4001 }, .popct=2 },
  61     { { .w16 = 0x7000 }, .popct=3 },
  62     { { .w16 = 0x7fff }, .popct=15 },
  63 };
  64
  65 static void test_ctpop16(void)
  66 {
  67     int i;
  68
  69     for (i = 0; i < ARRAY_SIZE(sixteen_bit_data); i++) {
  70         struct bitcnt_test_data *d = &sixteen_bit_data[i];
  71         g_assert(ctpop16(d->value.w16)==d->popct);
  72     }
  73 }
  74
  75 struct bitcnt_test_data thirtytwo_bit_data[] = {
  76     { { .w32 = 0x00000000 }, .popct=0 },
  77     { { .w32 = 0x00000001 }, .popct=1 },
  78     { { .w32 = 0x0000000f }, .popct=4 },
  79     { { .w32 = 0x00000f0f }, .popct=8 },
  80     { { .w32 = 0x00001f1f }, .popct=10 },
  81     { { .w32 = 0x00004001 }, .popct=2 },
  82     { { .w32 = 0x00007000 }, .popct=3 },
  83     { { .w32 = 0x00007fff }, .popct=15 },
  84     { { .w32 = 0x55555555 }, .popct=16 },
  85     { { .w32 = 0xaaaaaaaa }, .popct=16 },
  86     { { .w32 = 0xff000000 }, .popct=8 },
  87     { { .w32 = 0xc0c0c0c0 }, .popct=8 },
  88     { { .w32 = 0x0ffffff0 }, .popct=24 },
  89     { { .w32 = 0x80000000 }, .popct=1 },
  90     { { .w32 = 0xffffffff }, .popct=32 },
  91 };
  92
  93 static void test_ctpop32(void)
  94 {
  95     int i;
  96
  97     for (i = 0; i < ARRAY_SIZE(thirtytwo_bit_data); i++) {
  98         struct bitcnt_test_data *d = &thirtytwo_bit_data[i];
  99         g_assert(ctpop32(d->value.w32)==d->popct);
 100     }
 101 }
 102
 103 struct bitcnt_test_data sixtyfour_bit_data[] = {
 104     { { .w64 = 0x0000000000000000ULL }, .popct=0 },
 105     { { .w64 = 0x0000000000000001ULL }, .popct=1 },
 106     { { .w64 = 0x000000000000000fULL }, .popct=4 },
 107     { { .w64 = 0x0000000000000f0fULL }, .popct=8 },
 108     { { .w64 = 0x0000000000001f1fULL }, .popct=10 },
 109     { { .w64 = 0x0000000000004001ULL }, .popct=2 },
 110     { { .w64 = 0x0000000000007000ULL }, .popct=3 },
 111     { { .w64 = 0x0000000000007fffULL }, .popct=15 },
 112     { { .w64 = 0x0000005500555555ULL }, .popct=16 },
 113     { { .w64 = 0x00aa0000aaaa00aaULL }, .popct=16 },
 114     { { .w64 = 0x000f000000f00000ULL }, .popct=8 },
 115     { { .w64 = 0x0c0c0000c0c0c0c0ULL }, .popct=12 },
 116     { { .w64 = 0xf00f00f0f0f0f000ULL }, .popct=24 },
 117     { { .w64 = 0x8000000000000000ULL }, .popct=1 },
 118     { { .w64 = 0xf0f0f0f0f0f0f0f0ULL }, .popct=32 },
 119     { { .w64 = 0xffffffffffffffffULL }, .popct=64 },
 120 };
 121
 122 static void test_ctpop64(void)
 123 {
 124     int i;
 125
 126     for (i = 0; i < ARRAY_SIZE(sixtyfour_bit_data); i++) {
 127         struct bitcnt_test_data *d = &sixtyfour_bit_data[i];
 128         g_assert(ctpop64(d->value.w64)==d->popct);
 129     }
 130 }
 131
 132 int main(int argc, char **argv)
 133 {
 134     g_test_init(&argc, &argv, NULL);
 135     g_test_add_func("/bitcnt/ctpop8", test_ctpop8);
 136     g_test_add_func("/bitcnt/ctpop16", test_ctpop16);
 137     g_test_add_func("/bitcnt/ctpop32", test_ctpop32);
 138     g_test_add_func("/bitcnt/ctpop64", test_ctpop64);
 139     return g_test_run();
 140 }