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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 The GNU MP Library is free software; you can redistribute it and/or
c modify it under the terms of the GNU Lesser General Public License as
c published by the Free Software Foundation; either version 3 of the
c License, or (at your option) any later version.
c The GNU MP Library is distributed in the hope that it will be useful,
c but WITHOUT ANY WARRANTY; without even the implied warranty of
c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
c Lesser General Public License for more details.
c You should have received a copy of the GNU Lesser General Public License
c along with the GNU MP Library. If not, see http://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
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