From 11da511c784eca003deb90c23570f0873954e0de Mon Sep 17 00:00:00 2001
From: Duncan Wilkie <antigravityd@gmail.com>
Date: Sat, 18 Nov 2023 06:11:09 -0600
Subject: Initial commit.

---
 gmp-6.3.0/mpq/div.c | 133 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 gmp-6.3.0/mpq/div.c

(limited to 'gmp-6.3.0/mpq/div.c')

diff --git a/gmp-6.3.0/mpq/div.c b/gmp-6.3.0/mpq/div.c
new file mode 100644
index 0000000..3bd9726
--- /dev/null
+++ b/gmp-6.3.0/mpq/div.c
@@ -0,0 +1,133 @@
+/* mpq_div -- divide two rational numbers.
+
+Copyright 1991, 1994-1996, 2000, 2001, 2015, 2018 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-impl.h"
+
+
+void
+mpq_div (mpq_ptr quot, mpq_srcptr op1, mpq_srcptr op2)
+{
+  mpz_t gcd1, gcd2;
+  mpz_t tmp1, tmp2;
+  mp_size_t op1_size;
+  mp_size_t op2_size;
+  mp_size_t alloc;
+  TMP_DECL;
+
+  op2_size = SIZ(NUM(op2));
+
+  if (UNLIKELY (op2_size == 0))
+    DIVIDE_BY_ZERO;
+
+  if (UNLIKELY (quot == op2))
+    {
+      if (UNLIKELY (op1 == op2))
+	{
+	  mpq_set_ui (quot, 1, 1);
+	  return;
+	}
+
+      /* We checked for op1 == op2: we are not in the x=x/x case.
+	 We compute x=y/x by computing x=inv(x)*y */
+      MPN_PTR_SWAP (PTR(NUM(quot)), ALLOC(NUM(quot)),
+		    PTR(DEN(quot)), ALLOC(DEN(quot)));
+      if (op2_size > 0)
+	{
+	  SIZ(NUM(quot)) = SIZ(DEN(quot));
+	  SIZ(DEN(quot)) = op2_size;
+	}
+      else
+	{
+	  SIZ(NUM(quot)) = - SIZ(DEN(quot));
+	  SIZ(DEN(quot)) = - op2_size;
+	}
+      mpq_mul (quot, quot, op1);
+      return;
+    }
+
+  op1_size = ABSIZ(NUM(op1));
+
+  if (op1_size == 0)
+    {
+      /* We special case this to simplify allocation logic; gcd(0,x) = x
+	 is a singular case for the allocations.  */
+      SIZ(NUM(quot)) = 0;
+      MPZ_NEWALLOC (DEN(quot), 1)[0] = 1;
+      SIZ(DEN(quot)) = 1;
+      return;
+    }
+
+  op2_size = ABS(op2_size);
+
+  TMP_MARK;
+
+  alloc = MIN (op1_size, op2_size);
+  MPZ_TMP_INIT (gcd1, alloc);
+
+  alloc = MAX (op1_size, op2_size);
+  MPZ_TMP_INIT (tmp1, alloc);
+
+  op2_size = SIZ(DEN(op2));
+  op1_size = SIZ(DEN(op1));
+
+  alloc = MIN (op1_size, op2_size);
+  MPZ_TMP_INIT (gcd2, alloc);
+
+  alloc = MAX (op1_size, op2_size);
+  MPZ_TMP_INIT (tmp2, alloc);
+
+  /* QUOT might be identical to OP1, so don't store the result there
+     until we are finished with the input operand.  We can overwrite
+     the numerator of QUOT when we are finished with the numerator of
+     OP1. */
+
+  mpz_gcd (gcd1, NUM(op1), NUM(op2));
+  mpz_gcd (gcd2, DEN(op2), DEN(op1));
+
+  mpz_divexact_gcd (tmp1, NUM(op1), gcd1);
+  mpz_divexact_gcd (tmp2, DEN(op2), gcd2);
+
+  mpz_mul (NUM(quot), tmp1, tmp2);
+
+  mpz_divexact_gcd (tmp1, NUM(op2), gcd1);
+  mpz_divexact_gcd (tmp2, DEN(op1), gcd2);
+
+  mpz_mul (DEN(quot), tmp1, tmp2);
+
+  /* Keep the denominator positive.  */
+  if (SIZ(DEN(quot)) < 0)
+    {
+      SIZ(DEN(quot)) = -SIZ(DEN(quot));
+      SIZ(NUM(quot)) = -SIZ(NUM(quot));
+    }
+
+  TMP_FREE;
+}
-- 
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