Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/gmp-source/mpz/mul.c

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+/* mpz_mul -- Multiply two integers.
+
+Copyright 1991, 1993, 1994, 1996, 2000, 2001, 2005, 2009, 2011, 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 <stdio.h> /* for NULL */
+#include "gmp-impl.h"
+
+
+void
+mpz_mul (mpz_ptr w, mpz_srcptr u, mpz_srcptr v)
+{
+  mp_size_t usize;
+  mp_size_t vsize;
+  mp_size_t wsize;
+  mp_size_t sign_product;
+  mp_ptr up, vp;
+  mp_ptr wp;
+  mp_ptr free_me;
+  size_t free_me_size;
+  mp_limb_t cy_limb;
+  TMP_DECL;
+
+  usize = SIZ (u);
+  vsize = SIZ (v);
+  sign_product = usize ^ vsize;
+  usize = ABS (usize);
+  vsize = ABS (vsize);
+
+  if (usize < vsize)
+    {
+      MPZ_SRCPTR_SWAP (u, v);
+      MP_SIZE_T_SWAP (usize, vsize);
+    }
+
+  if (vsize == 0)
+    {
+      SIZ (w) = 0;
+      return;
+    }
+
+#if HAVE_NATIVE_mpn_mul_2
+  if (vsize <= 2)
+    {
+      wp = MPZ_REALLOC (w, usize+vsize);
+      if (vsize == 1)
+	cy_limb = mpn_mul_1 (wp, PTR (u), usize, PTR (v)[0]);
+      else
+	{
+	  cy_limb = mpn_mul_2 (wp, PTR (u), usize, PTR (v));
+	  usize++;
+	}
+      wp[usize] = cy_limb;
+      usize += (cy_limb != 0);
+      SIZ (w) = (sign_product >= 0 ? usize : -usize);
+      return;
+    }
+#else
+  if (vsize == 1)
+    {
+      wp = MPZ_REALLOC (w, usize+1);
+      cy_limb = mpn_mul_1 (wp, PTR (u), usize, PTR (v)[0]);
+      wp[usize] = cy_limb;
+      usize += (cy_limb != 0);
+      SIZ (w) = (sign_product >= 0 ? usize : -usize);
+      return;
+    }
+#endif
+
+  TMP_MARK;
+  free_me = NULL;
+  up = PTR (u);
+  vp = PTR (v);
+  wp = PTR (w);
+
+  /* Ensure W has space enough to store the result.  */
+  wsize = usize + vsize;
+  if (ALLOC (w) < wsize)
+    {
+      if (ALLOC (w) != 0)
+	{
+	  if (wp == up || wp == vp)
+	    {
+	      free_me = wp;
+	      free_me_size = ALLOC (w);
+	    }
+	  else
+	    (*__gmp_free_func) (wp, (size_t) ALLOC (w) * GMP_LIMB_BYTES);
+	}
+
+      ALLOC (w) = wsize;
+      wp = __GMP_ALLOCATE_FUNC_LIMBS (wsize);
+      PTR (w) = wp;
+    }
+  else
+    {
+      /* Make U and V not overlap with W.  */
+      if (wp == up)
+	{
+	  /* W and U are identical.  Allocate temporary space for U.  */
+	  up = TMP_ALLOC_LIMBS (usize);
+	  /* Is V identical too?  Keep it identical with U.  */
+	  if (wp == vp)
+	    vp = up;
+	  /* Copy to the temporary space.  */
+	  MPN_COPY (up, wp, usize);
+	}
+      else if (wp == vp)
+	{
+	  /* W and V are identical.  Allocate temporary space for V.  */
+	  vp = TMP_ALLOC_LIMBS (vsize);
+	  /* Copy to the temporary space.  */
+	  MPN_COPY (vp, wp, vsize);
+	}
+    }
+
+  if (up == vp)
+    {
+      mpn_sqr (wp, up, usize);
+      cy_limb = wp[wsize - 1];
+    }
+  else
+    {
+      cy_limb = mpn_mul (wp, up, usize, vp, vsize);
+    }
+
+  wsize -= cy_limb == 0;
+
+  SIZ (w) = sign_product < 0 ? -wsize : wsize;
+  if (free_me != NULL)
+    (*__gmp_free_func) (free_me, free_me_size * GMP_LIMB_BYTES);
+  TMP_FREE;
+}