mirror of
https://github.com/vale981/arb
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55 lines
1.3 KiB
C
55 lines
1.3 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 "mag.h"
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void
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mag_mul(mag_t z, const mag_t x, const mag_t y)
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{
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if (mag_is_special(x) || mag_is_special(y))
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{
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if (mag_is_inf(x) || mag_is_inf(y))
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mag_inf(z);
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else
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mag_zero(z);
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}
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else
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{
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slong fix;
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MAG_MAN(z) = MAG_FIXMUL(MAG_MAN(x), MAG_MAN(y)) + LIMB_ONE;
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fix = !(MAG_MAN(z) >> (MAG_BITS - 1));
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MAG_MAN(z) <<= fix;
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_fmpz_add2_fast(MAG_EXPREF(z), MAG_EXPREF(x), MAG_EXPREF(y), -fix);
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}
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}
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void
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mag_mul_lower(mag_t z, const mag_t x, const mag_t y)
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{
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if (mag_is_special(x) || mag_is_special(y))
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{
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if (mag_is_zero(x) || mag_is_zero(y))
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mag_zero(z);
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else
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mag_inf(z);
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}
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else
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{
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slong fix;
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MAG_MAN(z) = MAG_FIXMUL(MAG_MAN(x), MAG_MAN(y));
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fix = !(MAG_MAN(z) >> (MAG_BITS - 1));
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MAG_MAN(z) <<= fix;
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_fmpz_add2_fast(MAG_EXPREF(z), MAG_EXPREF(x), MAG_EXPREF(y), -fix);
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}
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}
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