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! sparc __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
! store difference in a third limb vector.
! Copyright (C) 1992, 1994 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., 675 Mass Ave, Cambridge, MA 02139, USA.
! INPUT PARAMETERS
! res_ptr %o0
! s1_ptr %o1
! s2_ptr %o2
! size %o3
#include "sysdep.h"
.text
.align 4
.global C_SYMBOL_NAME(__mpn_sub_n)
C_SYMBOL_NAME(__mpn_sub_n):
ld [%o1+0],%o4 ! read first limb from s1_ptr
srl %o3,4,%g1
ld [%o2+0],%o5 ! read first limb from s2_ptr
sub %g0,%o3,%o3
andcc %o3,(16-1),%o3
be Lzero
nop
sll %o3,2,%o3 ! multiply by 4
sub %o0,%o3,%o0 ! adjust res_ptr
sub %o1,%o3,%o1 ! adjust s1_ptr
sub %o2,%o3,%o2 ! adjust s2_ptr
mov %o4,%g2
sethi %hi(Lbase),%g3
or %g3,%lo(Lbase),%g3
sll %o3,2,%o3 ! multiply by 4
jmp %g3+%o3
mov %o5,%g3
Loop: subxcc %g2,%g3,%o3
add %o1,64,%o1
st %o3,[%o0+60]
add %o2,64,%o2
ld [%o1+0],%o4
add %o0,64,%o0
ld [%o2+0],%o5
Lzero: sub %g1,1,%g1 ! add 0 + 16r limbs (adjust loop counter)
Lbase: ld [%o1+4],%g2
subxcc %o4,%o5,%o3
ld [%o2+4],%g3
st %o3,[%o0+0]
ld [%o1+8],%o4 ! add 15 + 16r limbs
subxcc %g2,%g3,%o3
ld [%o2+8],%o5
st %o3,[%o0+4]
ld [%o1+12],%g2 ! add 14 + 16r limbs
subxcc %o4,%o5,%o3
ld [%o2+12],%g3
st %o3,[%o0+8]
ld [%o1+16],%o4 ! add 13 + 16r limbs
subxcc %g2,%g3,%o3
ld [%o2+16],%o5
st %o3,[%o0+12]
ld [%o1+20],%g2 ! add 12 + 16r limbs
subxcc %o4,%o5,%o3
ld [%o2+20],%g3
st %o3,[%o0+16]
ld [%o1+24],%o4 ! add 11 + 16r limbs
subxcc %g2,%g3,%o3
ld [%o2+24],%o5
st %o3,[%o0+20]
ld [%o1+28],%g2 ! add 10 + 16r limbs
subxcc %o4,%o5,%o3
ld [%o2+28],%g3
st %o3,[%o0+24]
ld [%o1+32],%o4 ! add 9 + 16r limbs
subxcc %g2,%g3,%o3
ld [%o2+32],%o5
st %o3,[%o0+28]
ld [%o1+36],%g2 ! add 8 + 16r limbs
subxcc %o4,%o5,%o3
ld [%o2+36],%g3
st %o3,[%o0+32]
ld [%o1+40],%o4 ! add 7 + 16r limbs
subxcc %g2,%g3,%o3
ld [%o2+40],%o5
st %o3,[%o0+36]
ld [%o1+44],%g2 ! add 6 + 16r limbs
subxcc %o4,%o5,%o3
ld [%o2+44],%g3
st %o3,[%o0+40]
ld [%o1+48],%o4 ! add 5 + 16r limbs
subxcc %g2,%g3,%o3
ld [%o2+48],%o5
st %o3,[%o0+44]
ld [%o1+52],%g2 ! add 4 + 16r limbs
subxcc %o4,%o5,%o3
ld [%o2+52],%g3
st %o3,[%o0+48]
ld [%o1+56],%o4 ! add 3 + 16r limbs
subxcc %g2,%g3,%o3
ld [%o2+56],%o5
st %o3,[%o0+52]
ld [%o1+60],%g2 ! add 2 + 16r limbs
subxcc %o4,%o5,%o3
ld [%o2+60],%g3
st %o3,[%o0+56]
subx %g0,%g0,%o4
tst %g1
bne Loop
subcc %g0,%o4,%g0 ! restore cy (delay slot)
subxcc %g2,%g3,%o3
st %o3,[%o0+60] ! store most significant limb
retl
addx %g0,%g0,%o0 ! return carry-out from most sign. limb
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