addll.h

#line 2 "../src/kernel/none/addll.h"
/* Copyright (C) 2003  The PARI group.

This file is part of the PARI/GP package.

PARI/GP is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version. It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY WHATSOEVER.

Check the License for details. You should have received a copy of it, along
with the package; see the file 'COPYING'. If not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */

/* This file originally adapted from gmp-3.1.1 (from T. Granlund), files
 * longlong.h and gmp-impl.h

  Copyright (C) 2000 Free Software Foundation, Inc. */

#undef LOCAL_OVERFLOW
#define LOCAL_OVERFLOW
extern ulong overflow;

#if !defined(INLINE)
extern long addll(ulong x, ulong y);
extern long addllx(ulong x, ulong y);
extern long subll(ulong x, ulong y);
extern long subllx(ulong x, ulong y);
#else

#if defined(__GNUC__) && !defined(DISABLE_INLINE)
#undef LOCAL_OVERFLOW
#define LOCAL_OVERFLOW register ulong overflow

#define addll(a, b)                                             \
__extension__ ({                                                \
   ulong __arg1 = (a), __arg2 = (b), __value = __arg1 + __arg2; \
   overflow = (__value < __arg1);                               \
   __value;                                                     \
})

#define addllx(a, b)                                          \
__extension__ ({                                              \
   ulong __arg1 = (a), __arg2 = (b), __value, __tmp = __arg1 + overflow;\
   overflow = (__tmp < __arg1);                               \
   __value = __tmp + __arg2;                                  \
   overflow |= (__value < __tmp);                             \
   __value;                                                   \
})

#define subll(a, b)                                           \
__extension__ ({                                              \
   ulong __arg1 = (a), __arg2 = (b);                          \
   overflow = (__arg2 > __arg1);                              \
   __arg1 - __arg2;                                           \
})

#define subllx(a, b)                                  \
__extension__ ({                                      \
   ulong __arg1 = (a), __arg2 = (b), __value, __tmp = __arg1 - overflow;\
   overflow = (__arg1 < overflow);                    \
   __value = __tmp - __arg2;                          \
   overflow |= (__arg2 > __tmp);                      \
   __value;                                           \
})

#else /* __GNUC__ */

INLINE long
addll(ulong x, ulong y)
{
  const ulong z = x+y;
  overflow=(z<x);
  return (long) z;
}

INLINE long
addllx(ulong x, ulong y)
{
  const ulong z = x+y+overflow;
  overflow = (z<x || (z==x && overflow));
  return (long) z;
}

INLINE long
subll(ulong x, ulong y)
{
  const ulong z = x-y;
  overflow = (z>x);
  return (long) z;
}

INLINE long
subllx(ulong x, ulong y)
{
  const ulong z = x-y-overflow;
  overflow = (z>x || (z==x && overflow));
  return (long) z;
}

#endif /* __GNUC__ */

#endif