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46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
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/* double mpz_get_d_2exp (signed long int *exp, mpz_t src).
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Copyright 2001, 2003, 2004 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 3 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. If not, see http://www.gnu.org/licenses/. */
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#include "gmp.h"
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#include "gmp-impl.h"
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#include "longlong.h"
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double
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mpz_get_d_2exp (signed long int *exp2, mpz_srcptr src)
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{
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mp_size_t size, abs_size;
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mp_srcptr ptr;
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int cnt;
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long exp;
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size = SIZ(src);
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if (UNLIKELY (size == 0))
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{
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*exp2 = 0;
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return 0.0;
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}
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ptr = PTR(src);
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abs_size = ABS(size);
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count_leading_zeros (cnt, ptr[abs_size - 1]);
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exp = abs_size * GMP_NUMB_BITS - (cnt - GMP_NAIL_BITS);
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*exp2 = exp;
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return mpn_get_d (ptr, abs_size, size, -exp);
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}
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