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Diffstat (limited to 'gnu/lib/libgmp/mpbsd/sdiv.c')
-rw-r--r-- | gnu/lib/libgmp/mpbsd/sdiv.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/gnu/lib/libgmp/mpbsd/sdiv.c b/gnu/lib/libgmp/mpbsd/sdiv.c new file mode 100644 index 00000000000..6982e200949 --- /dev/null +++ b/gnu/lib/libgmp/mpbsd/sdiv.c @@ -0,0 +1,77 @@ +/* sdiv -- Divide a MINT by a short integer. Produce a MINT quotient + and a short remainder. + +Copyright (C) 1991, 1994, 1995 Free Software Foundation, Inc. + +This file is part of the GNU MP Library. + +The GNU MP Library is free software; you can redistribute it and/or modify +it under the terms of the GNU Library General Public License as published by +the Free Software Foundation; either version 2 of the License, or (at your +option) any later version. + +The GNU MP Library is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY +or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public +License for more details. + +You should have received a copy of the GNU Library General Public License +along with the GNU MP Library; see the file COPYING.LIB. If not, write to +the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, +MA 02111-1307, USA. */ + +#include "mp.h" +#include "gmp.h" +#include "gmp-impl.h" +#include "longlong.h" + +void +#if __STDC__ +sdiv (const MINT *dividend, signed short int divisor_short, MINT *quot, short *rem_ptr) +#else +sdiv (dividend, divisor_short, quot, rem_ptr) + const MINT *dividend; + short int divisor_short; + MINT *quot; + short *rem_ptr; +#endif +{ + mp_size_t sign_dividend; + signed long int sign_divisor; + mp_size_t dividend_size, quot_size; + mp_ptr dividend_ptr, quot_ptr; + mp_limb_t divisor_limb; + mp_limb_t remainder_limb; + + sign_dividend = dividend->_mp_size; + dividend_size = ABS (dividend->_mp_size); + + if (dividend_size == 0) + { + quot->_mp_size = 0; + *rem_ptr = 0; + return; + } + + sign_divisor = divisor_short; + divisor_limb = ABS (divisor_short); + + /* No need for temporary allocation and copying even if QUOT == DIVIDEND + as the divisor is just one limb, and thus no intermediate remainders + need to be stored. */ + + if (quot->_mp_alloc < dividend_size) + _mp_realloc (quot, dividend_size); + + quot_ptr = quot->_mp_d; + dividend_ptr = dividend->_mp_d; + + remainder_limb = mpn_divmod_1 (quot_ptr, + dividend_ptr, dividend_size, divisor_limb); + + *rem_ptr = sign_dividend >= 0 ? remainder_limb : -remainder_limb; + /* The quotient is DIVIDEND_SIZE limbs, but the most significant + might be zero. Set QUOT_SIZE properly. */ + quot_size = dividend_size - (quot_ptr[dividend_size - 1] == 0); + quot->_mp_size = (sign_divisor ^ sign_dividend) >= 0 ? quot_size : -quot_size; +} |