55 lines
2.0 KiB
FortranFixed
55 lines
2.0 KiB
FortranFixed
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c Helper for mpn_mul_1, mpn_addmul_1, and mpn_submul_1 for Cray PVP.
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c Copyright 1996, 2000 Free Software Foundation, Inc.
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c This file is part of the GNU MP Library.
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c The GNU MP Library is free software; you can redistribute it and/or
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c modify it under the terms of the GNU Lesser General Public License as
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c published by the Free Software Foundation; either version 2.1 of the
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c License, or (at your option) any later version.
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c The GNU MP Library is distributed in the hope that it will be useful,
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c but WITHOUT ANY WARRANTY; without even the implied warranty of
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c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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c Lesser General Public License for more details.
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c You should have received a copy of the GNU Lesser General Public
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c License along with the GNU MP Library; see the file COPYING.LIB. If
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c not, write to the Free Software Foundation, Inc., 51 Franklin Street,
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c Fifth Floor, Boston, MA 02110-1301, USA.
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c p1[] = hi(a[]*s); the upper limbs of each product
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c p0[] = low(a[]*s); the corresponding lower limbs
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c n is number of limbs in the vectors
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subroutine gmpn_mulww(p1,p0,a,n,s)
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integer*8 p1(0:*),p0(0:*),a(0:*),s
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integer n
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integer*8 a0,a1,a2,s0,s1,s2,c
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integer*8 ai,t0,t1,t2,t3,t4
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s0 = shiftl(and(s,4194303),24)
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s1 = shiftl(and(shiftr(s,22),4194303),24)
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s2 = shiftl(and(shiftr(s,44),4194303),24)
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do i = 0,n-1
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ai = a(i)
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a0 = shiftl(and(ai,4194303),24)
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a1 = shiftl(and(shiftr(ai,22),4194303),24)
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a2 = shiftl(and(shiftr(ai,44),4194303),24)
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t0 = i24mult(a0,s0)
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t1 = i24mult(a0,s1)+i24mult(a1,s0)
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t2 = i24mult(a0,s2)+i24mult(a1,s1)+i24mult(a2,s0)
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t3 = i24mult(a1,s2)+i24mult(a2,s1)
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t4 = i24mult(a2,s2)
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p0(i)=shiftl(t2,44)+shiftl(t1,22)+t0
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c=shiftr(shiftr(t0,22)+and(t1,4398046511103)+
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$ shiftl(and(t2,1048575),22),42)
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p1(i)=shiftl(t4,24)+shiftl(t3,2)+shiftr(t2,20)+shiftr(t1,42)+c
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end do
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end
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