Viewing file:  pr44806.c (1.59 KB) -rw-r--r--
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/* { dg-do run } */
/* { dg-options "-std=c99" } */
#include <stdint.h>
extern void abort (void);
#define N_DEV_BITS_4 5
#define N_INO_BITS_4 (32 - N_DEV_BITS_4 - 2 - 1)
#define N_DEV_BITS_8 8
#define N_INO_BITS_8 (64 - N_DEV_BITS_8 - 2 - 1)
struct dev_ino_4
{
uint32_t mode:2;
uint32_t short_ino:N_INO_BITS_4;
uint32_t mapped_dev:N_DEV_BITS_4;
uint32_t always_set:1;
};
struct dev_ino_8
{
uint32_t mode:2;
uint64_t short_ino:N_INO_BITS_8;
uint32_t mapped_dev:N_DEV_BITS_8;
uint32_t always_set:1;
};
struct dev_ino_full
{
uint32_t mode:2;
uint32_t dev;
uint32_t ino;
};
enum di_mode
{
DI_MODE_4 = 1,
DI_MODE_8 = 2,
DI_MODE_FULL = 3
};
struct di_ent
{
union
{
struct dev_ino_4 di4;
struct dev_ino_8 di8;
struct dev_ino_full full;
uint32_t u32;
uint64_t u64;
void *ptr;
} u;
};
static struct di_ent
decode_ptr (struct di_ent const *v)
{
struct di_ent di;
di.u.ptr = (void *) v;
return di;
}
static int
di_ent_equal (void const *x, void const *y)
{
struct di_ent a = decode_ptr (x);
struct di_ent b = decode_ptr (y);
if (a.u.di4.mode != b.u.di4.mode)
return 0;
if (a.u.di4.mode == DI_MODE_4)
return (a.u.di4.short_ino == b.u.di4.short_ino
&& a.u.di4.mapped_dev == b.u.di4.mapped_dev);
if (a.u.di8.mode == DI_MODE_8)
return (a.u.di8.short_ino == b.u.di8.short_ino
&& a.u.di8.mapped_dev == b.u.di8.mapped_dev);
return (a.u.full.ino == b.u.full.ino
&& a.u.full.dev == b.u.full.dev);
}
int
main ()
{
if (di_ent_equal ((void *) 0x80143c4d, (void *) 0x80173851) != 0)
abort ();
return 0;
}
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