summaryrefslogtreecommitdiff
path: root/Build/source/libs/gmp/gmp-6.0.0/mpz/kronzu.c
diff options
context:
space:
mode:
Diffstat (limited to 'Build/source/libs/gmp/gmp-6.0.0/mpz/kronzu.c')
-rw-r--r--Build/source/libs/gmp/gmp-6.0.0/mpz/kronzu.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/Build/source/libs/gmp/gmp-6.0.0/mpz/kronzu.c b/Build/source/libs/gmp/gmp-6.0.0/mpz/kronzu.c
new file mode 100644
index 00000000000..f57f92e8ba1
--- /dev/null
+++ b/Build/source/libs/gmp/gmp-6.0.0/mpz/kronzu.c
@@ -0,0 +1,89 @@
+/* mpz_kronecker_ui -- mpz+ulong Kronecker/Jacobi symbol.
+
+Copyright 1999-2002 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 either:
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at your
+ option) any later version.
+
+or
+
+ * the GNU General Public License as published by the Free Software
+ Foundation; either version 2 of the License, or (at your option) any
+ later version.
+
+or both in parallel, as here.
+
+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 General Public License
+for more details.
+
+You should have received copies of the GNU General Public License and the
+GNU Lesser General Public License along with the GNU MP Library. If not,
+see https://www.gnu.org/licenses/. */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "longlong.h"
+
+
+int
+mpz_kronecker_ui (mpz_srcptr a, unsigned long b)
+{
+ mp_srcptr a_ptr;
+ mp_size_t a_size;
+ mp_limb_t a_rem;
+ int result_bit1;
+
+ a_size = SIZ(a);
+ if (a_size == 0)
+ return JACOBI_0U (b);
+
+ if (b > GMP_NUMB_MAX)
+ {
+ mp_limb_t blimbs[2];
+ mpz_t bz;
+ ALLOC(bz) = numberof (blimbs);
+ PTR(bz) = blimbs;
+ mpz_set_ui (bz, b);
+ return mpz_kronecker (a, bz);
+ }
+
+ a_ptr = PTR(a);
+ if ((b & 1) != 0)
+ {
+ result_bit1 = JACOBI_ASGN_SU_BIT1 (a_size, b);
+ }
+ else
+ {
+ mp_limb_t a_low = a_ptr[0];
+ int twos;
+
+ if (b == 0)
+ return JACOBI_LS0 (a_low, a_size); /* (a/0) */
+
+ if (! (a_low & 1))
+ return 0; /* (even/even)=0 */
+
+ /* (a/2)=(2/a) for a odd */
+ count_trailing_zeros (twos, b);
+ b >>= twos;
+ result_bit1 = (JACOBI_TWOS_U_BIT1 (twos, a_low)
+ ^ JACOBI_ASGN_SU_BIT1 (a_size, b));
+ }
+
+ if (b == 1)
+ return JACOBI_BIT1_TO_PN (result_bit1); /* (a/1)=1 for any a */
+
+ a_size = ABS(a_size);
+
+ /* (a/b) = (a mod b / b) */
+ JACOBI_MOD_OR_MODEXACT_1_ODD (result_bit1, a_rem, a_ptr, a_size, b);
+ return mpn_jacobi_base (a_rem, (mp_limb_t) b, result_bit1);
+}