qemu

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test-bitcnt.c (4189B)

      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 }