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divdi3.S
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divdi3.S
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/* Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU CC 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
.data
.align 8
.globl __clz_tab
__clz_tab:
.byte 0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5
.byte 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6
.byte 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
.byte 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
.byte 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
.byte 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
.byte 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
.byte 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
.size __clz_tab,256
.global .udiv
.text
.align 4
.globl __divdi3
__divdi3:
save %sp,-104,%sp
cmp %i0,0
bge .LL40
mov 0,%l4
mov -1,%l4
sub %g0,%i1,%o0
mov %o0,%o5
subcc %g0,%o0,%g0
sub %g0,%i0,%o0
subx %o0,0,%o4
mov %o4,%i0
mov %o5,%i1
.LL40:
cmp %i2,0
bge .LL84
mov %i3,%o4
xnor %g0,%l4,%l4
sub %g0,%i3,%o0
mov %o0,%o3
subcc %g0,%o0,%g0
sub %g0,%i2,%o0
subx %o0,0,%o2
mov %o2,%i2
mov %o3,%i3
mov %i3,%o4
.LL84:
cmp %i2,0
bne .LL45
mov %i1,%i3
cmp %o4,%i0
bleu .LL46
mov %i3,%o1
mov 32,%g1
subcc %i0,%o4,%g0
1: bcs 5f
addxcc %o1,%o1,%o1 ! shift n1n0 and a q-bit in lsb
sub %i0,%o4,%i0 ! this kills msb of n
addx %i0,%i0,%i0 ! so this cannot give carry
subcc %g1,1,%g1
2: bne 1b
subcc %i0,%o4,%g0
bcs 3f
addxcc %o1,%o1,%o1 ! shift n1n0 and a q-bit in lsb
b 3f
sub %i0,%o4,%i0 ! this kills msb of n
4: sub %i0,%o4,%i0
5: addxcc %i0,%i0,%i0
bcc 2b
subcc %g1,1,%g1
! Got carry from n. Subtract next step to cancel this carry.
bne 4b
addcc %o1,%o1,%o1 ! shift n1n0 and a 0-bit in lsb
sub %i0,%o4,%i0
3: xnor %o1,0,%o1
b .LL50
mov 0,%o2
.LL46:
cmp %o4,0
bne .LL85
mov %i0,%o2
mov 1,%o0
call .udiv,0
mov 0,%o1
mov %o0,%o4
mov %i0,%o2
.LL85:
mov 0,%g3
mov 32,%g1
subcc %g3,%o4,%g0
1: bcs 5f
addxcc %o2,%o2,%o2 ! shift n1n0 and a q-bit in lsb
sub %g3,%o4,%g3 ! this kills msb of n
addx %g3,%g3,%g3 ! so this cannot give carry
subcc %g1,1,%g1
2: bne 1b
subcc %g3,%o4,%g0
bcs 3f
addxcc %o2,%o2,%o2 ! shift n1n0 and a q-bit in lsb
b 3f
sub %g3,%o4,%g3 ! this kills msb of n
4: sub %g3,%o4,%g3
5: addxcc %g3,%g3,%g3
bcc 2b
subcc %g1,1,%g1
! Got carry from n. Subtract next step to cancel this carry.
bne 4b
addcc %o2,%o2,%o2 ! shift n1n0 and a 0-bit in lsb
sub %g3,%o4,%g3
3: xnor %o2,0,%o2
mov %g3,%i0
mov %i3,%o1
mov 32,%g1
subcc %i0,%o4,%g0
1: bcs 5f
addxcc %o1,%o1,%o1 ! shift n1n0 and a q-bit in lsb
sub %i0,%o4,%i0 ! this kills msb of n
addx %i0,%i0,%i0 ! so this cannot give carry
subcc %g1,1,%g1
2: bne 1b
subcc %i0,%o4,%g0
bcs 3f
addxcc %o1,%o1,%o1 ! shift n1n0 and a q-bit in lsb
b 3f
sub %i0,%o4,%i0 ! this kills msb of n
4: sub %i0,%o4,%i0
5: addxcc %i0,%i0,%i0
bcc 2b
subcc %g1,1,%g1
! Got carry from n. Subtract next step to cancel this carry.
bne 4b
addcc %o1,%o1,%o1 ! shift n1n0 and a 0-bit in lsb
sub %i0,%o4,%i0
3: xnor %o1,0,%o1
b .LL86
mov %o1,%l1
.LL45:
cmp %i2,%i0
bleu .LL51
sethi %hi(65535),%o0
b .LL78
mov 0,%o1
.LL51:
or %o0,%lo(65535),%o0
cmp %i2,%o0
bgu .LL58
mov %i2,%o1
cmp %i2,256
addx %g0,-1,%o0
b .LL64
and %o0,8,%o2
.LL58:
sethi %hi(16777215),%o0
or %o0,%lo(16777215),%o0
cmp %i2,%o0
bgu .LL64
mov 24,%o2
mov 16,%o2
.LL64:
srl %o1,%o2,%o0
sethi %hi(__clz_tab),%o1
or %o1,%lo(__clz_tab),%o1
ldub [%o0+%o1],%o0
add %o0,%o2,%o0
mov 32,%o1
subcc %o1,%o0,%o3
bne,a .LL72
sub %o1,%o3,%o1
cmp %i0,%i2
bgu .LL74
cmp %i3,%o4
blu .LL78
mov 0,%o1
.LL74:
b .LL78
mov 1,%o1
.LL72:
sll %i2,%o3,%o2
srl %o4,%o1,%o0
or %o2,%o0,%i2
sll %o4,%o3,%o4
srl %i0,%o1,%o2
sll %i0,%o3,%o0
srl %i3,%o1,%o1
or %o0,%o1,%i0
sll %i3,%o3,%i3
mov %i0,%o1
mov 32,%g1
subcc %o2,%i2,%g0
1: bcs 5f
addxcc %o1,%o1,%o1 ! shift n1n0 and a q-bit in lsb
sub %o2,%i2,%o2 ! this kills msb of n
addx %o2,%o2,%o2 ! so this cannot give carry
subcc %g1,1,%g1
2: bne 1b
subcc %o2,%i2,%g0
bcs 3f
addxcc %o1,%o1,%o1 ! shift n1n0 and a q-bit in lsb
b 3f
sub %o2,%i2,%o2 ! this kills msb of n
4: sub %o2,%i2,%o2
5: addxcc %o2,%o2,%o2
bcc 2b
subcc %g1,1,%g1
! Got carry from n. Subtract next step to cancel this carry.
bne 4b
addcc %o1,%o1,%o1 ! shift n1n0 and a 0-bit in lsb
sub %o2,%i2,%o2
3: xnor %o1,0,%o1
mov %o2,%i0
wr %g0,%o1,%y ! SPARC has 0-3 delay insn after a wr
sra %o4,31,%g2 ! Do not move this insn
and %o1,%g2,%g2 ! Do not move this insn
andcc %g0,0,%g1 ! Do not move this insn
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,%o4,%g1
mulscc %g1,0,%g1
add %g1,%g2,%o0
rd %y,%o2
cmp %o0,%i0
bgu,a .LL78
add %o1,-1,%o1
bne,a .LL50
mov 0,%o2
cmp %o2,%i3
bleu .LL50
mov 0,%o2
add %o1,-1,%o1
.LL78:
mov 0,%o2
.LL50:
mov %o1,%l1
.LL86:
mov %o2,%l0
mov %l0,%i0
mov %l1,%i1
cmp %l4,0
be .LL81
sub %g0,%i1,%o0
mov %o0,%l3
subcc %g0,%o0,%g0
sub %g0,%i0,%o0
subx %o0,0,%l2
mov %l2,%i0
mov %l3,%i1
.LL81:
ret
restore