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/mpz/com.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 gmp-6.3.0/mpz/com.c

(limited to 'gmp-6.3.0/mpz/com.c')

diff --git a/gmp-6.3.0/mpz/com.c b/gmp-6.3.0/mpz/com.c
new file mode 100644
index 0000000..c5d22b0
--- /dev/null
+++ b/gmp-6.3.0/mpz/com.c
@@ -0,0 +1,87 @@
+/* mpz_com(mpz_ptr dst, mpz_ptr src) -- Assign the bit-complemented value of
+   SRC to DST.
+
+Copyright 1991, 1993, 1994, 1996, 2001, 2003, 2012, 2015 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
+mpz_com (mpz_ptr dst, mpz_srcptr src)
+{
+  mp_size_t size = SIZ (src);
+  mp_srcptr src_ptr;
+  mp_ptr dst_ptr;
+
+  if (size >= 0)
+    {
+      /* As with infinite precision: one's complement, two's complement.
+	 But this can be simplified using the identity -x = ~x + 1.
+	 So we're going to compute (~~x) + 1 = x + 1!  */
+
+      if (UNLIKELY (size == 0))
+	{
+	  /* special case, as mpn_add_1 wants size!=0 */
+	  MPZ_NEWALLOC (dst, 1)[0] = 1;
+	  SIZ (dst) = -1;
+	}
+      else
+	{
+	  mp_limb_t cy;
+
+	  dst_ptr = MPZ_REALLOC (dst, size + 1);
+
+	  src_ptr = PTR (src);
+
+	  cy = mpn_add_1 (dst_ptr, src_ptr, size, (mp_limb_t) 1);
+	  dst_ptr[size] = cy;
+	  size += cy;
+
+	  /* Store a negative size, to indicate ones-extension.  */
+	  SIZ (dst) = -size;
+      }
+    }
+  else
+    {
+      /* As with infinite precision: two's complement, then one's complement.
+	 But that can be simplified using the identity -x = ~(x - 1).
+	 So we're going to compute ~~(x - 1) = x - 1!  */
+      size = -size;
+
+      dst_ptr = MPZ_REALLOC (dst, size);
+
+      src_ptr = PTR (src);
+
+      mpn_sub_1 (dst_ptr, src_ptr, size, (mp_limb_t) 1);
+      size -= dst_ptr[size - 1] == 0;
+
+      /* Store a positive size, to indicate zero-extension.  */
+      SIZ (dst) = size;
+    }
+}
-- 
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