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typedef unsigned long int st;
typedef unsigned long long dt;
typedef union
{
dt d;
struct
{
st h, l;
}
s;
} t_be;
typedef union
{
dt d;
struct
{
st l, h;
}
s;
} t_le;
#define df(f, t) \
int \
f (t afh, t bfh) \
{ \
t hh; \
t hp, lp, dp, m; \
st ad, bd; \
int s; \
s = 0; \
ad = afh.s.h - afh.s.l; \
bd = bfh.s.l - bfh.s.h; \
if (bd > bfh.s.l) \
{ \
bd = -bd; \
s = ~s; \
} \
lp.d = (dt) afh.s.l * bfh.s.l; \
hp.d = (dt) afh.s.h * bfh.s.h; \
dp.d = (dt) ad *bd; \
dp.d ^= s; \
hh.d = hp.d + hp.s.h + lp.s.h + dp.s.h; \
m.d = (dt) lp.s.h + hp.s.l + lp.s.l + dp.s.l; \
return hh.s.l + m.s.l; \
}
df(f_le, t_le)
df(f_be, t_be)
main ()
{
t_be x;
x.s.h = 0x10000000U;
x.s.l = 0xe0000000U;
if (x.d == 0x10000000e0000000ULL
&& f_be ((t_be) 0x100000000ULL, (t_be) 0x100000000ULL) != -1)
abort ();
if (x.d == 0xe000000010000000ULL
&& f_le ((t_le) 0x100000000ULL, (t_le) 0x100000000ULL) != -1)
abort ();
exit (0);
}
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