Add Chromium-only Blender WebEngine parity work

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

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+/* mpz_si_kronecker -- long+mpz Kronecker/Jacobi symbol.
+
+Copyright 1999-2002 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"
+#include "longlong.h"
+
+
+int
+mpz_si_kronecker (long a, mpz_srcptr b)
+{
+  mp_srcptr  b_ptr;
+  mp_limb_t  b_low;
+  mp_size_t  b_size;
+  mp_size_t  b_abs_size;
+  mp_limb_t  a_limb, b_rem;
+  unsigned   twos;
+  int        result_bit1;
+
+#if GMP_NUMB_BITS < BITS_PER_ULONG
+  if (a > GMP_NUMB_MAX || a < -GMP_NUMB_MAX)
+    {
+      mp_limb_t  alimbs[2];
+      mpz_t      az;
+      ALLOC(az) = numberof (alimbs);
+      PTR(az) = alimbs;
+      mpz_set_si (az, a);
+      return mpz_kronecker (az, b);
+    }
+#endif
+
+  b_size = SIZ (b);
+  if (b_size == 0)
+    return JACOBI_S0 (a);  /* (a/0) */
+
+  /* account for the effect of the sign of b, then ignore it */
+  result_bit1 = JACOBI_BSGN_SS_BIT1 (a, b_size);
+
+  b_ptr = PTR(b);
+  b_low = b_ptr[0];
+  b_abs_size = ABS (b_size);
+
+  if ((b_low & 1) != 0)
+    {
+      /* b odd */
+
+      result_bit1 ^= JACOBI_ASGN_SU_BIT1 (a, b_low);
+      a_limb = ABS_CAST(mp_limb_t, a);
+
+      if ((a_limb & 1) == 0)
+	{
+	  /* (0/b)=1 for b=+/-1, 0 otherwise */
+	  if (a_limb == 0)
+	    return (b_abs_size == 1 && b_low == 1);
+
+	  /* a even, b odd */
+	  count_trailing_zeros (twos, a_limb);
+	  a_limb >>= twos;
+	  /* (a*2^n/b) = (a/b) * twos(n,a) */
+	  result_bit1 ^= JACOBI_TWOS_U_BIT1 (twos, b_low);
+	}
+    }
+  else
+    {
+      /* (even/even)=0, and (0/b)=0 for b!=+/-1 */
+      if ((a & 1) == 0)
+	return 0;
+
+      /* a odd, b even
+
+	 Establish shifted b_low with valid bit1 for ASGN and RECIP below.
+	 Zero limbs stripped are accounted for, but zero bits on b_low are
+	 not because they remain in {b_ptr,b_abs_size} for the
+	 JACOBI_MOD_OR_MODEXACT_1_ODD. */
+
+      JACOBI_STRIP_LOW_ZEROS (result_bit1, a, b_ptr, b_abs_size, b_low);
+      if ((b_low & 1) == 0)
+	{
+	  if (UNLIKELY (b_low == GMP_NUMB_HIGHBIT))
+	    {
+	      /* need b_ptr[1] to get bit1 in b_low */
+	      if (b_abs_size == 1)
+		{
+		  /* (a/0x80000000) = (a/2)^(BPML-1) */
+		  if ((GMP_NUMB_BITS % 2) == 0)
+		    result_bit1 ^= JACOBI_TWO_U_BIT1 (a);
+		  return JACOBI_BIT1_TO_PN (result_bit1);
+		}
+
+	      /* b_abs_size > 1 */
+	      b_low = b_ptr[1] << 1;
+	    }
+	  else
+	    {
+	      count_trailing_zeros (twos, b_low);
+	      b_low >>= twos;
+	    }
+	}
+
+      result_bit1 ^= JACOBI_ASGN_SU_BIT1 (a, b_low);
+      a_limb = (unsigned long) ABS(a);
+    }
+
+  if (a_limb == 1)
+    return JACOBI_BIT1_TO_PN (result_bit1);  /* (1/b)=1 */
+
+  /* (a/b*2^n) = (b*2^n mod a / a) * recip(a,b) */
+  JACOBI_MOD_OR_MODEXACT_1_ODD (result_bit1, b_rem, b_ptr, b_abs_size, a_limb);
+  result_bit1 ^= JACOBI_RECIP_UU_BIT1 (a_limb, b_low);
+  return mpn_jacobi_base (b_rem, a_limb, result_bit1);
+}