mirror of
https://gitlab.gnome.org/GNOME/glib.git
synced 2024-11-05 17:06:18 +01:00
46dae95f4a
2007-01-04 Behdad Esfahbod <behdad@gnome.org>
* tests/bit-test.c (builtin_bit_nth_lsf1), (builtin_bit_nth_lsf2),
(builtin_bit_nth_msf): Fix tests on x86_64.
svn path=/trunk/; revision=5216
146 lines
2.8 KiB
C
146 lines
2.8 KiB
C
#include <glib.h>
|
|
|
|
#if defined(__GNUC__) && (__GNUC__ >= 4)
|
|
# define TEST_BUILTINS 1
|
|
#else
|
|
# define TEST_BUILTINS 0
|
|
#endif
|
|
|
|
#if TEST_BUILTINS
|
|
static gint
|
|
builtin_bit_nth_lsf1 (gulong mask, gint nth_bit)
|
|
{
|
|
if (nth_bit >= 0)
|
|
{
|
|
if (G_LIKELY (nth_bit < GLIB_SIZEOF_LONG * 8 - 1))
|
|
mask &= -(1UL<<(nth_bit+1));
|
|
else
|
|
mask = 0;
|
|
}
|
|
return __builtin_ffsl(mask) - 1;
|
|
}
|
|
|
|
static gint
|
|
builtin_bit_nth_lsf2 (gulong mask, gint nth_bit)
|
|
{
|
|
if (nth_bit >= 0)
|
|
{
|
|
if (G_LIKELY (nth_bit < GLIB_SIZEOF_LONG * 8 - 1))
|
|
mask &= -(1UL<<(nth_bit+1));
|
|
else
|
|
mask = 0;
|
|
}
|
|
return mask ? __builtin_ctzl(mask) : -1;
|
|
}
|
|
|
|
static gint
|
|
builtin_bit_nth_msf (gulong mask, gint nth_bit)
|
|
{
|
|
if (nth_bit >= 0 && nth_bit < GLIB_SIZEOF_LONG * 8)
|
|
mask &= (1UL<<nth_bit)-1;
|
|
return mask ? GLIB_SIZEOF_LONG * 8 - 1 - __builtin_clzl(mask) : -1;
|
|
}
|
|
|
|
|
|
static guint
|
|
builtin_bit_storage (gulong number)
|
|
{
|
|
return number ? GLIB_SIZEOF_LONG * 8 - __builtin_clzl(number) : 1;
|
|
}
|
|
#endif
|
|
|
|
|
|
static gint
|
|
naive_bit_nth_lsf (gulong mask, gint nth_bit)
|
|
{
|
|
if (G_UNLIKELY (nth_bit < -1))
|
|
nth_bit = -1;
|
|
while (nth_bit < ((GLIB_SIZEOF_LONG * 8) - 1))
|
|
{
|
|
nth_bit++;
|
|
if (mask & (1UL << nth_bit))
|
|
return nth_bit;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static gint
|
|
naive_bit_nth_msf (gulong mask, gint nth_bit)
|
|
{
|
|
if (nth_bit < 0 || G_UNLIKELY (nth_bit > GLIB_SIZEOF_LONG * 8))
|
|
nth_bit = GLIB_SIZEOF_LONG * 8;
|
|
while (nth_bit > 0)
|
|
{
|
|
nth_bit--;
|
|
if (mask & (1UL << nth_bit))
|
|
return nth_bit;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static guint
|
|
naive_bit_storage (gulong number)
|
|
{
|
|
register guint n_bits = 0;
|
|
|
|
do
|
|
{
|
|
n_bits++;
|
|
number >>= 1;
|
|
}
|
|
while (number);
|
|
return n_bits;
|
|
}
|
|
|
|
|
|
|
|
#define TEST(f1, f2, i) \
|
|
if (f1 (i) != f2 (i)) { \
|
|
g_error (G_STRINGIFY (f1) " (%lu) = %d; " \
|
|
G_STRINGIFY (f2) " (%lu) = %d; ", \
|
|
i, f1 (i), \
|
|
i, f2 (i)); \
|
|
return 1; \
|
|
}
|
|
#define TEST2(f1, f2, i, n) \
|
|
if (f1 (i, n) != f2 (i, n)) { \
|
|
g_error (G_STRINGIFY (f1) " (%lu, %d) = %d; " \
|
|
G_STRINGIFY (f2) " (%lu, %d) = %d; ", \
|
|
i, n, f1 (i, n), \
|
|
i, n, f2 (i, n)); \
|
|
return 1; \
|
|
}
|
|
|
|
int
|
|
main (void)
|
|
{
|
|
gulong i;
|
|
gint nth_bit;
|
|
|
|
/* we loop like this: 0, -1, 1, -2, 2, -3, 3, ... */
|
|
for (i = 0; (glong)i < 1500 ; i = -(i+((glong)i>=0))) {
|
|
|
|
#if TEST_BUILTINS
|
|
TEST (naive_bit_storage, builtin_bit_storage, i);
|
|
#endif
|
|
TEST (naive_bit_storage, g_bit_storage, i);
|
|
|
|
for (nth_bit = -3; nth_bit <= 2 + GLIB_SIZEOF_LONG * 8; nth_bit++) {
|
|
|
|
#if TEST_BUILTINS
|
|
TEST2 (naive_bit_nth_lsf, builtin_bit_nth_lsf1, i, nth_bit);
|
|
TEST2 (naive_bit_nth_lsf, builtin_bit_nth_lsf2, i, nth_bit);
|
|
#endif
|
|
TEST2 (naive_bit_nth_lsf, g_bit_nth_lsf, i, nth_bit);
|
|
|
|
#if TEST_BUILTINS
|
|
TEST2 (naive_bit_nth_msf, builtin_bit_nth_msf, i, nth_bit);
|
|
#endif
|
|
TEST2 (naive_bit_nth_msf, g_bit_nth_msf, i, nth_bit);
|
|
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|