Add Chromium-only Blender WebEngine parity work

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

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+/* mpz_mul_ui/si (product, multiplier, small_multiplicand) -- Set PRODUCT to
+   MULTIPLICATOR times SMALL_MULTIPLICAND.
+
+Copyright 1991, 1993, 1994, 1996, 2000-2002, 2005, 2008, 2012 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_mul_si
+#define FUNCTION               mpz_mul_si
+#define MULTIPLICAND_UNSIGNED
+#define MULTIPLICAND_ABS(x)    ABS_CAST(unsigned long, (x))
+#endif
+
+#ifdef OPERATION_mul_ui
+#define FUNCTION               mpz_mul_ui
+#define MULTIPLICAND_UNSIGNED  unsigned
+#define MULTIPLICAND_ABS(x)    x
+#endif
+
+#ifndef FUNCTION
+Error, error, unrecognised OPERATION
+#endif
+
+
+void
+FUNCTION (mpz_ptr prod, mpz_srcptr mult,
+          MULTIPLICAND_UNSIGNED long int small_mult)
+{
+  mp_size_t size;
+  mp_size_t sign_product;
+  mp_limb_t sml;
+  mp_limb_t cy;
+  mp_ptr pp;
+
+  sign_product = SIZ(mult);
+  if (sign_product == 0 || small_mult == 0)
+    {
+      SIZ(prod) = 0;
+      return;
+    }
+
+  size = ABS (sign_product);
+
+  sml = MULTIPLICAND_ABS (small_mult);
+
+  if (sml <= GMP_NUMB_MAX)
+    {
+      pp = MPZ_REALLOC (prod, size + 1);
+      cy = mpn_mul_1 (pp, PTR(mult), size, sml);
+      pp[size] = cy;
+      size += cy != 0;
+    }
+#if GMP_NAIL_BITS != 0
+  else
+    {
+      /* Operand too large for the current nails size.  Use temporary for
+	 intermediate products, to allow prod and mult being identical.  */
+      mp_ptr tp;
+      TMP_DECL;
+      TMP_MARK;
+
+      tp = TMP_ALLOC_LIMBS (size + 2);
+
+      /* Use, maybe, mpn_mul_2? */
+      cy = mpn_mul_1 (tp, PTR(mult), size, sml & GMP_NUMB_MASK);
+      tp[size] = cy;
+      cy = mpn_addmul_1 (tp + 1, PTR(mult), size, sml >> GMP_NUMB_BITS);
+      tp[size + 1] = cy;
+      size += 2;
+      MPN_NORMALIZE_NOT_ZERO (tp, size); /* too general, need to trim one or two limb */
+      pp = MPZ_NEWALLOC (prod, size);
+      MPN_COPY (pp, tp, size);
+      TMP_FREE;
+    }
+#endif
+
+  SIZ(prod) = ((sign_product < 0) ^ (small_mult < 0)) ? -size : size;
+}