divdi3.S
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上传日期:2013-02-24
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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