mirror of
https://github.com/vale981/arb
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48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
/*
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Copyright (C) 2014 Fredrik Johansson
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This file is part of Arb.
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Arb is free software: you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version. See <http://www.gnu.org/licenses/>.
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*/
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#include "fmpz_extras.h"
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void
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fmpz_lshift_mpn(fmpz_t z, mp_srcptr d, mp_size_t dn, int sgnbit, flint_bitcnt_t shift)
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{
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__mpz_struct * zmpz;
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mp_ptr zp;
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mp_size_t zn, shift_limbs;
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flint_bitcnt_t shift_bits;
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zmpz = _fmpz_promote(z);
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shift_limbs = shift / FLINT_BITS;
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shift_bits = shift % FLINT_BITS;
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zn = dn + shift_limbs + (shift_bits != 0);
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if (zmpz->_mp_alloc < zn)
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mpz_realloc2(zmpz, zn * FLINT_BITS);
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zp = zmpz->_mp_d;
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flint_mpn_zero(zp, shift_limbs);
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if (shift_bits == 0)
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{
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flint_mpn_copyi(zp + shift_limbs, d, dn);
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}
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else
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{
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zp[zn - 1] = mpn_lshift(zp + shift_limbs, d, dn, shift_bits);
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while (zp[zn - 1] == 0)
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zn--;
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}
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zmpz->_mp_size = sgnbit ? -(slong) zn : zn;
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_fmpz_demote_val(z);
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}
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