Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/gmp-source/mpn/generic/rshift.c

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+/* mpn_rshift -- Shift right low level.
+
+Copyright 1991, 1993, 1994, 1996, 2000-2002 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-impl.h"
+
+/* Shift U (pointed to by up and N limbs long) cnt bits to the right
+   and store the n least significant limbs of the result at rp.
+   The bits shifted out to the right are returned.
+
+   Argument constraints:
+   1. 0 < cnt < GMP_NUMB_BITS.
+   2. If the result is to be written over the input, rp must be <= up.
+*/
+
+mp_limb_t
+mpn_rshift (mp_ptr rp, mp_srcptr up, mp_size_t n, unsigned int cnt)
+{
+  mp_limb_t high_limb, low_limb;
+  unsigned int tnc;
+  mp_size_t i;
+  mp_limb_t retval;
+
+  ASSERT (n >= 1);
+  ASSERT (cnt >= 1);
+  ASSERT (cnt < GMP_NUMB_BITS);
+  ASSERT (MPN_SAME_OR_INCR_P (rp, up, n));
+
+  tnc = GMP_NUMB_BITS - cnt;
+  high_limb = *up++;
+  retval = (high_limb << tnc) & GMP_NUMB_MASK;
+  low_limb = high_limb >> cnt;
+
+  for (i = n - 1; i != 0; i--)
+    {
+      high_limb = *up++;
+      *rp++ = low_limb | ((high_limb << tnc) & GMP_NUMB_MASK);
+      low_limb = high_limb >> cnt;
+    }
+  *rp = low_limb;
+
+  return retval;
+}