LXR qemu/tests/unit/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
  12struct 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
  24struct 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
  40static 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
  50struct 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
  65static 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
  75struct 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
  93static 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
 103struct 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
 122static 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
 132int 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}
 141