Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/gmp-source/mpz/aors.h

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+/* mpz_add, mpz_sub -- add or subtract integers.
+
+Copyright 1991, 1993, 1994, 1996, 2000, 2001, 2011, 2012, 2020 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"
+
+
+#ifdef OPERATION_add
+#define FUNCTION     mpz_add
+#define VARIATION
+#endif
+#ifdef OPERATION_sub
+#define FUNCTION     mpz_sub
+#define VARIATION    -
+#endif
+
+#ifndef FUNCTION
+Error, need OPERATION_add or OPERATION_sub
+#endif
+
+
+void
+FUNCTION (mpz_ptr w, mpz_srcptr u, mpz_srcptr v)
+{
+  mp_srcptr up, vp;
+  mp_ptr wp;
+  mp_size_t usize, vsize, wsize;
+  mp_size_t abs_usize;
+  mp_size_t abs_vsize;
+
+  usize = SIZ(u);
+  vsize = VARIATION SIZ(v);
+  abs_usize = ABS (usize);
+  abs_vsize = ABS (vsize);
+
+  if (abs_usize < abs_vsize)
+    {
+      /* Swap U and V. */
+      MPZ_SRCPTR_SWAP (u, v);
+      MP_SIZE_T_SWAP (usize, vsize);
+      MP_SIZE_T_SWAP (abs_usize, abs_vsize);
+    }
+
+  /* True: ABS_USIZE >= ABS_VSIZE.  */
+
+  /* If not space for w (and possible carry), increase space.  */
+  wsize = abs_usize + 1;
+  wp = MPZ_REALLOC (w, wsize);
+
+  /* These must be after realloc (u or v may be the same as w).  */
+  up = PTR(u);
+  vp = PTR(v);
+
+  if ((usize ^ vsize) < 0)
+    {
+      /* U and V have different sign.  Need to compare them to determine
+	 which operand to subtract from which.  */
+
+      /* This test is right since ABS_USIZE >= ABS_VSIZE.  */
+      if (abs_usize != abs_vsize)
+	{
+	  mpn_sub (wp, up, abs_usize, vp, abs_vsize);
+	  wsize = abs_usize;
+	  MPN_NORMALIZE_NOT_ZERO (wp, wsize);
+	  if (usize < 0)
+	    wsize = -wsize;
+	}
+      else
+	{
+	  int cmp = mpn_cmp (up, vp, abs_usize);
+	  if (cmp < 0)
+	    {
+	      mpn_sub_n (wp, vp, up, abs_usize);
+	      wsize = abs_usize;
+	      MPN_NORMALIZE_NOT_ZERO (wp, wsize);
+	      if (usize >= 0)
+		wsize = -wsize;
+	    }
+	  else if (cmp > 0)
+	    {
+	      mpn_sub_n (wp, up, vp, abs_usize);
+	      wsize = abs_usize;
+	      MPN_NORMALIZE_NOT_ZERO (wp, wsize);
+	      if (usize < 0)
+		wsize = -wsize;
+	    }
+	  else
+	    wsize = 0;
+	}
+    }
+  else
+    {
+      /* U and V have same sign.  Add them.  */
+      mp_limb_t cy_limb = mpn_add (wp, up, abs_usize, vp, abs_vsize);
+      wp[abs_usize] = cy_limb;
+      wsize = abs_usize + cy_limb;
+      if (usize < 0)
+	wsize = -wsize;
+    }
+
+  SIZ(w) = wsize;
+}