64 lines
1019 B
C
64 lines
1019 B
C
typedef unsigned long int st;
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typedef unsigned long long dt;
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typedef union
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{
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dt d;
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struct
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{
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st h, l;
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}
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s;
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} t_be;
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typedef union
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{
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dt d;
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struct
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{
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st l, h;
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}
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s;
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} t_le;
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#define df(f, t) \
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int \
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f (t afh, t bfh) \
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{ \
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t hh; \
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t hp, lp, dp, m; \
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st ad, bd; \
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int s; \
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s = 0; \
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ad = afh.s.h - afh.s.l; \
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bd = bfh.s.l - bfh.s.h; \
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if (bd > bfh.s.l) \
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{ \
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bd = -bd; \
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s = ~s; \
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} \
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lp.d = (dt) afh.s.l * bfh.s.l; \
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hp.d = (dt) afh.s.h * bfh.s.h; \
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dp.d = (dt) ad *bd; \
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dp.d ^= s; \
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hh.d = hp.d + hp.s.h + lp.s.h + dp.s.h; \
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m.d = (dt) lp.s.h + hp.s.l + lp.s.l + dp.s.l; \
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return hh.s.l + m.s.l; \
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}
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df(f_le, t_le)
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df(f_be, t_be)
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main ()
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{
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t_be x;
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x.s.h = 0x10000000U;
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x.s.l = 0xe0000000U;
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if (x.d == 0x10000000e0000000ULL
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&& f_be ((t_be) 0x100000000ULL, (t_be) 0x100000000ULL) != -1)
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abort ();
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if (x.d == 0xe000000010000000ULL
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&& f_le ((t_le) 0x100000000ULL, (t_le) 0x100000000ULL) != -1)
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abort ();
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exit (0);
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}
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