Imported gcc-4.4.3

[msp430-gcc.git] / gmp / mpq / aors.c

diff --git a/gmp/mpq/aors.c b/gmp/mpq/aors.c
new file mode 100644 (file)
index 0000000..5e09de5
--- /dev/null
+++ b/gmp/mpq/aors.c
@@ -0,0 +1,102 @@
+/* mpq_add, mpq_sub -- add or subtract rational numbers.
+
+Copyright 1991, 1994, 1995, 1996, 1997, 2000, 2001, 2004, 2005 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 3 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.  If not, see http://www.gnu.org/licenses/.  */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+
+static void __gmpq_aors __GMP_PROTO ((REGPARM_3_1 (mpq_ptr, mpq_srcptr, mpq_srcptr, void (*) __GMP_PROTO ((mpz_ptr, mpz_srcptr, mpz_srcptr))))) REGPARM_ATTR (1);
+#define mpq_aors(w,x,y,fun)  __gmpq_aors (REGPARM_3_1 (w, x, y, fun))
+
+REGPARM_ATTR (1) static void
+mpq_aors (mpq_ptr rop, mpq_srcptr op1, mpq_srcptr op2,
+          void (*fun) __GMP_PROTO ((mpz_ptr, mpz_srcptr, mpz_srcptr)))
+{
+  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 =      op1->_mp_den._mp_size;
+  mp_size_t op2_num_size = ABS (op2->_mp_num._mp_size);
+  mp_size_t op2_den_size =      op2->_mp_den._mp_size;
+  TMP_DECL;
+
+  TMP_MARK;
+  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 (! MPZ_EQUAL_1_P (gcd))
+    {
+      mpz_t t;
+
+      mpz_divexact_gcd (tmp1, &(op2->_mp_den), gcd);
+      mpz_mul (tmp1, &(op1->_mp_num), tmp1);
+
+      mpz_divexact_gcd (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);
+
+      (*fun) (t, tmp1, tmp2);
+      mpz_divexact_gcd (tmp2, &(op1->_mp_den), gcd);
+
+      mpz_gcd (gcd, t, gcd);
+      if (MPZ_EQUAL_1_P (gcd))
+        {
+          mpz_set (&(rop->_mp_num), t);
+          mpz_mul (&(rop->_mp_den), &(op2->_mp_den), tmp2);
+        }
+      else
+        {
+          mpz_divexact_gcd (&(rop->_mp_num), t, gcd);
+          mpz_divexact_gcd (tmp1, &(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), which is about 60.8%.  */
+      mpz_mul (tmp1, &(op1->_mp_num), &(op2->_mp_den));
+      mpz_mul (tmp2, &(op2->_mp_num), &(op1->_mp_den));
+      (*fun) (&(rop->_mp_num), tmp1, tmp2);
+      mpz_mul (&(rop->_mp_den), &(op1->_mp_den), &(op2->_mp_den));
+    }
+  TMP_FREE;
+}
+
+
+void
+mpq_add (mpq_ptr rop, mpq_srcptr op1, mpq_srcptr op2)
+{
+  mpq_aors (rop, op1, op2, mpz_add);
+}
+
+void
+mpq_sub (mpq_ptr rop, mpq_srcptr op1, mpq_srcptr op2)
+{
+  mpq_aors (rop, op1, op2, mpz_sub);
+}