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/* SPARC v9 __mpn_submul_1 -- Multiply a limb vector with a single limb and
subtract the product from a second limb vector.
Copyright (C) 1996 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 the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
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 Library General Public
License for more details.
You should have received a copy of the GNU Library General Public License
along with the GNU MP Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include <sysdep.h>
/* INPUT PARAMETERS
res_ptr o0
s1_ptr o1
size o2
s2_limb o3 */
ENTRY(__mpn_submul_1)
save %sp,-192,%sp
sub %g0,%i2,%o7
mov 0,%o0 ! zero cy_limb
sllx %o7,3,%o7
sethi %hi(0x80000000),%o2
srl %i3,0,%o1 ! extract low 32 bits of s2_limb
sub %i1,%o7,%o3
srlx %i3,32,%i3 ! extract high 32 bits of s2_limb
sub %i0,%o7,%o4
add %o2,%o2,%o2 ! o2 = 0x100000000
! hi !
! mid-1 !
! mid-2 !
! lo !
1:
ldx [%o3+%o7],%g5
srl %g5,0,%i0 ! zero hi bits
ldx [%o4+%o7],%l1
srlx %g5,32,%g5
mulx %o1,%i0,%i4 ! lo product
mulx %i3,%i0,%i1 ! mid-1 product
mulx %o1,%g5,%l2 ! mid-2 product
mulx %i3,%g5,%i5 ! hi product
srlx %i4,32,%i0 ! extract high 32 bits of lo product...
add %i1,%i0,%i1 ! ...and add it to the mid-1 product
addcc %i1,%l2,%i1 ! add mid products
mov 0,%l0 ! we need the carry from that add...
movcs %xcc,%o2,%l0 ! ...compute it and...
sllx %i1,32,%i0 ! align low bits of mid product
add %i5,%l0,%i5 ! ...add to bit 32 of the hi product
srl %i4,0,%g5 ! zero high 32 bits of lo product
add %i0,%g5,%i0 ! combine into low 64 bits of result
srlx %i1,32,%i1 ! extract high bits of mid product...
addcc %i0,%o0,%i0 ! add cy_limb to low 64 bits of result
add %i5,%i1,%i1 ! ...and add them to the high result
mov 0,%g5
movcs %xcc,1,%g5
subcc %l1,%i0,%i0
stx %i0,[%o4+%o7]
add %g5,1,%l1
movcs %xcc,%l1,%g5
addcc %o7,8,%o7
bne,pt %xcc,1b
add %i1,%g5,%o0 ! compute new cy_limb
jmpl %i7+8, %g0
restore %o0,%g0,%o0
END(__mpn_submul_1)
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