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! SPARC __mpn_submul_1 -- Multiply a limb vector with a limb and subtract
! the result from a second limb vector.
!
! Copyright (C) 1992-2019 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 Lesser General Public License as published by
! the Free Software Foundation; either version 2.1 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 Lesser General Public
! License for more details.
!
! You should have received a copy of the GNU Lesser General Public License
! along with the GNU MP Library; see the file COPYING.LIB. If not,
! see <https://www.gnu.org/licenses/>.
! INPUT PARAMETERS
! RES_PTR o0
! S1_PTR o1
! SIZE o2
! S2_LIMB o3
#include <sysdep.h>
ENTRY(__mpn_submul_1)
! Make S1_PTR and RES_PTR point at the end of their blocks
! and put (- 4 x SIZE) in index/loop counter.
sll %o2,2,%o2
add %o0,%o2,%o4 ! RES_PTR in o4 since o0 is retval
add %o1,%o2,%o1
sub %g0,%o2,%o2
cmp %o3,0xfff
bgu LOC(large)
nop
ld [%o1+%o2],%o5
mov 0,%o0
b LOC(0)
add %o4,-4,%o4
LOC(loop0):
subcc %o5,%g1,%g1
ld [%o1+%o2],%o5
addx %o0,%g0,%o0
st %g1,[%o4+%o2]
LOC(0): wr %g0,%o3,%y
sra %o5,31,%g2
and %o3,%g2,%g2
andcc %g1,0,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,%o5,%g1
mulscc %g1,0,%g1
sra %g1,20,%g4
sll %g1,12,%g1
rd %y,%g3
srl %g3,20,%g3
or %g1,%g3,%g1
addcc %g1,%o0,%g1
addx %g2,%g4,%o0 ! add sign-compensation and cy to hi limb
addcc %o2,4,%o2 ! loop counter
bne LOC(loop0)
ld [%o4+%o2],%o5
subcc %o5,%g1,%g1
addx %o0,%g0,%o0
retl
st %g1,[%o4+%o2]
LOC(large):
ld [%o1+%o2],%o5
mov 0,%o0
sra %o3,31,%g4 ! g4 = mask of ones iff S2_LIMB < 0
b LOC(1)
add %o4,-4,%o4
LOC(loop):
subcc %o5,%g3,%g3
ld [%o1+%o2],%o5
addx %o0,%g0,%o0
st %g3,[%o4+%o2]
LOC(1): wr %g0,%o5,%y
and %o5,%g4,%g2
andcc %g0,%g0,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%o3,%g1
mulscc %g1,%g0,%g1
rd %y,%g3
addcc %g3,%o0,%g3
addx %g2,%g1,%o0
addcc %o2,4,%o2
bne LOC(loop)
ld [%o4+%o2],%o5
subcc %o5,%g3,%g3
addx %o0,%g0,%o0
retl
st %g3,[%o4+%o2]
END(__mpn_submul_1)
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