Reorganisation of the source tree

[ghc-hetmet.git] / rts / gmp / randlc2x.c

diff --git a/rts/gmp/randlc2x.c b/rts/gmp/randlc2x.c
new file mode 100644 (file)
index 0000000..dbd5f04
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+++ b/rts/gmp/randlc2x.c
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+/* 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;
+}