53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
/* int mpz_fits_X_p (mpz_t z) -- test whether z fits signed type X.
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Copyright 1997, 2000, 2001, 2002 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "gmp.h"
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#include "gmp-impl.h"
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int
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FUNCTION (mpz_srcptr z)
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{
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mp_size_t n = SIZ(z);
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mp_ptr p = PTR(z);
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mp_limb_t limb = p[0];
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if (n == 0)
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return 1;
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if (n == 1)
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return limb <= MAXIMUM;
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if (n == -1)
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return limb <= - (mp_limb_t) MINIMUM;
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#if GMP_NAIL_BITS != 0
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{
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if ((p[1] >> GMP_NAIL_BITS) == 0)
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{
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limb += p[1] << GMP_NUMB_BITS;
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if (n == 2)
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return limb <= MAXIMUM;
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if (n == -2)
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return limb <= - (mp_limb_t) MINIMUM;
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}
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}
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#endif
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return 0;
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}
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