1 files changed, 85 insertions, 0 deletions
diff --git a/contrib/libgmp/mpq/add.c b/contrib/libgmp/mpq/add.c
new file mode 100644
index 0000000..6b98b46
--- /dev/null
+++ b/contrib/libgmp/mpq/add.c
@@ -0,0 +1,85 @@
+/* mpq_add -- add two rational numbers.
+
+Copyright (C) 1991, 1994, 1995, 1996 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 "gmp.h"
+#include "gmp-impl.h"
+
+void
+#if __STDC__
+mpq_add (mpq_ptr rop, mpq_srcptr op1, mpq_srcptr op2)
+#else
+mpq_add (rop, op1, op2)
+     mpq_ptr rop;
+     mpq_srcptr op1;
+     mpq_srcptr op2;
+#endif
+{
+  mpz_t gcd;
+  mpz_t tmp1, tmp2;
+  mp_size_t op1_num_size = ABS (op1->_mp_num._mp_size);
+  mp_size_t op1_den_size = ABS (op1->_mp_den._mp_size);
+  mp_size_t op2_num_size = ABS (op2->_mp_num._mp_size);
+  mp_size_t op2_den_size = ABS (op2->_mp_den._mp_size);
+  TMP_DECL (marker);
+
+  TMP_MARK (marker);
+  MPZ_TMP_INIT (gcd, MIN (op1_den_size, op2_den_size));
+  MPZ_TMP_INIT (tmp1, op1_num_size + op2_den_size);
+  MPZ_TMP_INIT (tmp2, op2_num_size + op1_den_size);
+
+  /* ROP might be identical to either operand, so don't store the
+     result there until we are finished with the input operands.  We
+     dare to overwrite the numerator of ROP when we are finished
+     with the numerators of OP1 and OP2.  */
+
+  mpz_gcd (gcd, &(op1->_mp_den), &(op2->_mp_den));
+  if (gcd->_mp_size > 1 || gcd->_mp_d[0] != 1)
+    {
+      mpz_t t;
+
+      mpz_divexact (tmp1, &(op2->_mp_den), gcd);
+      mpz_mul (tmp1, &(op1->_mp_num), tmp1);
+
+      mpz_divexact (tmp2, &(op1->_mp_den), gcd);
+      mpz_mul (tmp2, &(op2->_mp_num), tmp2);
+
+      MPZ_TMP_INIT (t, MAX (ABS (tmp1->_mp_size), ABS (tmp2->_mp_size)) + 1);
+
+      mpz_add (t, tmp1, tmp2);
+      mpz_divexact (tmp1, &(op1->_mp_den), gcd);
+      mpz_gcd (gcd, t, gcd);
+
+      mpz_divexact (&(rop->_mp_num), t, gcd);
+
+      mpz_divexact (tmp2, &(op2->_mp_den), gcd);
+      mpz_mul (&(rop->_mp_den), tmp1, tmp2);
+    }
+  else
+    {
+      /* The common divisor is 1.  This is the case (for random input) with
+	 probability 6/(pi**2).  */
+      mpz_mul (tmp1, &(op1->_mp_num), &(op2->_mp_den));
+      mpz_mul (tmp2, &(op2->_mp_num), &(op1->_mp_den));
+      mpz_add (&(rop->_mp_num), tmp1, tmp2);
+      mpz_mul (&(rop->_mp_den), &(op1->_mp_den), &(op2->_mp_den));
+    }
+  TMP_FREE (marker);
+}