Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/gmp-source/mpn/cray/mulww.f

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+c    Helper for mpn_mul_1, mpn_addmul_1, and mpn_submul_1 for Cray PVP.
+
+c    Copyright 1996, 2000 Free Software Foundation, Inc.
+
+c    This file is part of the GNU MP Library.
+c
+c    The GNU MP Library is free software; you can redistribute it and/or modify
+c    it under the terms of either:
+c
+c      * the GNU Lesser General Public License as published by the Free
+c        Software Foundation; either version 3 of the License, or (at your
+c        option) any later version.
+c
+c    or
+c
+c      * the GNU General Public License as published by the Free Software
+c        Foundation; either version 2 of the License, or (at your option) any
+c        later version.
+c
+c    or both in parallel, as here.
+c
+c    The GNU MP Library is distributed in the hope that it will be useful, but
+c    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+c    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+c    for more details.
+c
+c    You should have received copies of the GNU General Public License and the
+c    GNU Lesser General Public License along with the GNU MP Library.  If not,
+c    see https://www.gnu.org/licenses/.
+
+c    p1[] = hi(a[]*s); the upper limbs of each product
+c    p0[] = low(a[]*s); the corresponding lower limbs
+c    n is number of limbs in the vectors
+
+      subroutine gmpn_mulww(p1,p0,a,n,s)
+      integer*8 p1(0:*),p0(0:*),a(0:*),s
+      integer n
+
+      integer*8 a0,a1,a2,s0,s1,s2,c
+      integer*8 ai,t0,t1,t2,t3,t4
+
+      s0 = shiftl(and(s,4194303),24)
+      s1 = shiftl(and(shiftr(s,22),4194303),24)
+      s2 = shiftl(and(shiftr(s,44),4194303),24)
+
+      do i = 0,n-1
+         ai = a(i)
+         a0 = shiftl(and(ai,4194303),24)
+         a1 = shiftl(and(shiftr(ai,22),4194303),24)
+         a2 = shiftl(and(shiftr(ai,44),4194303),24)
+
+         t0 = i24mult(a0,s0)
+         t1 = i24mult(a0,s1)+i24mult(a1,s0)
+         t2 = i24mult(a0,s2)+i24mult(a1,s1)+i24mult(a2,s0)
+         t3 = i24mult(a1,s2)+i24mult(a2,s1)
+         t4 = i24mult(a2,s2)
+
+         p0(i)=shiftl(t2,44)+shiftl(t1,22)+t0
+         c=shiftr(shiftr(t0,22)+and(t1,4398046511103)+
+     $        shiftl(and(t2,1048575),22),42)
+         p1(i)=shiftl(t4,24)+shiftl(t3,2)+shiftr(t2,20)+shiftr(t1,42)+c
+      end do
+      end