diff options
Diffstat (limited to 'rts/gmp/randlc2x.c')
| -rw-r--r-- | rts/gmp/randlc2x.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/rts/gmp/randlc2x.c b/rts/gmp/randlc2x.c new file mode 100644 index 0000000000..dbd5f041ee --- /dev/null +++ b/rts/gmp/randlc2x.c @@ -0,0 +1,59 @@ +/* gmp_randinit_lc_2exp (state, a, c, m2exp) -- Initialize random + state STATE for a linear congruential generator with multiplier A, + adder C, and modulus 2 ^ M2EXP. + +Copyright (C) 2000 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 Lesser General Public License as published by +the Free Software Foundation; either version 2.1 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 Lesser General Public +License for more details. + +You should have received a copy of the GNU Lesser 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 "gmp.h" +#include "gmp-impl.h" + +void +#if __STDC__ +gmp_randinit_lc_2exp (gmp_randstate_t rstate, + mpz_t a, + unsigned long int c, + unsigned long int m2exp) +#else +gmp_randinit_lc_2exp (rstate, a, c, m2exp) + gmp_randstate_t rstate; + mpz_t a; + unsigned long int c; + unsigned long int m2exp; +#endif +{ + mpz_init_set_ui (rstate->seed, 1); + _mpz_realloc (rstate->seed, m2exp / BITS_PER_MP_LIMB + + (m2exp % BITS_PER_MP_LIMB != 0)); + + /* Allocate algorithm specific data. */ + rstate->algdata.lc = (__gmp_randata_lc *) + (*_mp_allocate_func) (sizeof (__gmp_randata_lc)); + + mpz_init_set (rstate->algdata.lc->a, a); + rstate->algdata.lc->c = c; + + /* Cover weird case where m2exp is 0, which means that m is used + instead of m2exp. */ + if (m2exp == 0) + mpz_init_set_ui (rstate->algdata.lc->m, 0); + rstate->algdata.lc->m2exp = m2exp; + + rstate->alg = GMP_RAND_ALG_LC; +} |