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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [sparc/] [lib/] [divdi3.S] - Blame information for rev 3

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1 3 xianfeng 
/* Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING.  If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.  */
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        .data
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        .align 8
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        .globl  __clz_tab
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__clz_tab:
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        .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
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        .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
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        .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
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        .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
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        .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
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        .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
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        .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
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        .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
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        .size    __clz_tab,256
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        .global .udiv
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        .text
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        .align 4
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        .globl __divdi3
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__divdi3:
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        save %sp,-104,%sp
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        cmp %i0,0
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        bge .LL40
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        mov 0,%l4
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        mov -1,%l4
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        sub %g0,%i1,%o0
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        mov %o0,%o5
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        subcc %g0,%o0,%g0
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        sub %g0,%i0,%o0
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        subx %o0,0,%o4
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        mov %o4,%i0
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        mov %o5,%i1
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.LL40:
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        cmp %i2,0
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        bge .LL84
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        mov %i3,%o4
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        xnor %g0,%l4,%l4
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        sub %g0,%i3,%o0
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        mov %o0,%o3
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        subcc %g0,%o0,%g0
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        sub %g0,%i2,%o0
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        subx %o0,0,%o2
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        mov %o2,%i2
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        mov %o3,%i3
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        mov %i3,%o4
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.LL84:
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        cmp %i2,0
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        bne .LL45
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        mov %i1,%i3
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        cmp %o4,%i0
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        bleu .LL46
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        mov %i3,%o1
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        mov     32,%g1
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        subcc   %i0,%o4,%g0
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1:      bcs     5f
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         addxcc %o1,%o1,%o1     ! shift n1n0 and a q-bit in lsb
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        sub     %i0,%o4,%i0     ! this kills msb of n
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        addx    %i0,%i0,%i0     ! so this cannot give carry
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        subcc   %g1,1,%g1
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2:      bne     1b
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         subcc  %i0,%o4,%g0
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        bcs     3f
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         addxcc %o1,%o1,%o1     ! shift n1n0 and a q-bit in lsb
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        b       3f
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         sub    %i0,%o4,%i0     ! this kills msb of n
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4:      sub     %i0,%o4,%i0
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5:      addxcc  %i0,%i0,%i0
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        bcc     2b
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         subcc  %g1,1,%g1
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! Got carry from n.  Subtract next step to cancel this carry.
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        bne     4b
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         addcc  %o1,%o1,%o1     ! shift n1n0 and a 0-bit in lsb
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        sub     %i0,%o4,%i0
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3:      xnor    %o1,0,%o1
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        b .LL50
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        mov 0,%o2
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.LL46:
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        cmp %o4,0
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        bne .LL85
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        mov %i0,%o2
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        mov 1,%o0
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        call .udiv,0
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        mov 0,%o1
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        mov %o0,%o4
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        mov %i0,%o2
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.LL85:
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        mov 0,%g3
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        mov     32,%g1
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        subcc   %g3,%o4,%g0
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1:      bcs     5f
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         addxcc %o2,%o2,%o2     ! shift n1n0 and a q-bit in lsb
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        sub     %g3,%o4,%g3     ! this kills msb of n
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        addx    %g3,%g3,%g3     ! so this cannot give carry
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        subcc   %g1,1,%g1
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2:      bne     1b
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         subcc  %g3,%o4,%g0
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        bcs     3f
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         addxcc %o2,%o2,%o2     ! shift n1n0 and a q-bit in lsb
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        b       3f
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         sub    %g3,%o4,%g3     ! this kills msb of n
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4:      sub     %g3,%o4,%g3
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5:      addxcc  %g3,%g3,%g3
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        bcc     2b
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         subcc  %g1,1,%g1
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! Got carry from n.  Subtract next step to cancel this carry.
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        bne     4b
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         addcc  %o2,%o2,%o2     ! shift n1n0 and a 0-bit in lsb
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        sub     %g3,%o4,%g3
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3:      xnor    %o2,0,%o2
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        mov %g3,%i0
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        mov %i3,%o1
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        mov     32,%g1
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        subcc   %i0,%o4,%g0
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1:      bcs     5f
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         addxcc %o1,%o1,%o1     ! shift n1n0 and a q-bit in lsb
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        sub     %i0,%o4,%i0     ! this kills msb of n
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        addx    %i0,%i0,%i0     ! so this cannot give carry
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        subcc   %g1,1,%g1
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2:      bne     1b
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         subcc  %i0,%o4,%g0
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        bcs     3f
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         addxcc %o1,%o1,%o1     ! shift n1n0 and a q-bit in lsb
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        b       3f
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         sub    %i0,%o4,%i0     ! this kills msb of n
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4:      sub     %i0,%o4,%i0
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5:      addxcc  %i0,%i0,%i0
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        bcc     2b
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         subcc  %g1,1,%g1
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! Got carry from n.  Subtract next step to cancel this carry.
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        bne     4b
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         addcc  %o1,%o1,%o1     ! shift n1n0 and a 0-bit in lsb
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        sub     %i0,%o4,%i0
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3:      xnor    %o1,0,%o1
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        b .LL86
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        mov %o1,%l1
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.LL45:
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        cmp %i2,%i0
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        bleu .LL51
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        sethi %hi(65535),%o0
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        b .LL78
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        mov 0,%o1
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.LL51:
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        or %o0,%lo(65535),%o0
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        cmp %i2,%o0
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        bgu .LL58
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        mov %i2,%o1
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        cmp %i2,256
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        addx %g0,-1,%o0
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        b .LL64
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        and %o0,8,%o2
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.LL58:
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        sethi %hi(16777215),%o0
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        or %o0,%lo(16777215),%o0
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        cmp %i2,%o0
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        bgu .LL64
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        mov 24,%o2
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        mov 16,%o2
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.LL64:
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        srl %o1,%o2,%o0
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        sethi %hi(__clz_tab),%o1
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        or %o1,%lo(__clz_tab),%o1
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        ldub [%o0+%o1],%o0
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        add %o0,%o2,%o0
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        mov 32,%o1
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        subcc %o1,%o0,%o3
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        bne,a .LL72
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        sub %o1,%o3,%o1
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        cmp %i0,%i2
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        bgu .LL74
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        cmp %i3,%o4
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        blu .LL78
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        mov 0,%o1
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.LL74:
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        b .LL78
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        mov 1,%o1
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.LL72:
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        sll %i2,%o3,%o2
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        srl %o4,%o1,%o0
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        or %o2,%o0,%i2
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        sll %o4,%o3,%o4
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        srl %i0,%o1,%o2
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        sll %i0,%o3,%o0
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        srl %i3,%o1,%o1
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        or %o0,%o1,%i0
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        sll %i3,%o3,%i3
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        mov %i0,%o1
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        mov     32,%g1
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        subcc   %o2,%i2,%g0
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1:      bcs     5f
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         addxcc %o1,%o1,%o1     ! shift n1n0 and a q-bit in lsb
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        sub     %o2,%i2,%o2     ! this kills msb of n
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        addx    %o2,%o2,%o2     ! so this cannot give carry
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        subcc   %g1,1,%g1
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2:      bne     1b
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         subcc  %o2,%i2,%g0
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        bcs     3f
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         addxcc %o1,%o1,%o1     ! shift n1n0 and a q-bit in lsb
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        b       3f
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         sub    %o2,%i2,%o2     ! this kills msb of n
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4:      sub     %o2,%i2,%o2
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5:      addxcc  %o2,%o2,%o2
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        bcc     2b
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         subcc  %g1,1,%g1
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! Got carry from n.  Subtract next step to cancel this carry.
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        bne     4b
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         addcc  %o1,%o1,%o1     ! shift n1n0 and a 0-bit in lsb
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        sub     %o2,%i2,%o2
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3:      xnor    %o1,0,%o1
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        mov %o2,%i0
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        wr      %g0,%o1,%y      ! SPARC has 0-3 delay insn after a wr
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        sra     %o4,31,%g2      ! Do not move this insn
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        and     %o1,%g2,%g2     ! Do not move this insn
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        andcc   %g0,0,%g1       ! Do not move this insn
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
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        mulscc  %g1,%o4,%g1
263 
        mulscc  %g1,%o4,%g1
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        mulscc  %g1,0,%g1
265 
        add     %g1,%g2,%o0
266 
        rd      %y,%o2
267 
        cmp %o0,%i0
268 
        bgu,a .LL78
269 
        add %o1,-1,%o1
270 
        bne,a .LL50
271 
        mov 0,%o2
272 
        cmp %o2,%i3
273 
        bleu .LL50
274 
        mov 0,%o2
275 
        add %o1,-1,%o1
276 
.LL78:
277 
        mov 0,%o2
278 
.LL50:
279 
        mov %o1,%l1
280 
.LL86:
281 
        mov %o2,%l0
282 
        mov %l0,%i0
283 
        mov %l1,%i1
284 
        cmp %l4,0
285 
        be .LL81
286 
        sub %g0,%i1,%o0
287 
        mov %o0,%l3
288 
        subcc %g0,%o0,%g0
289 
        sub %g0,%i0,%o0
290 
        subx %o0,0,%l2
291 
        mov %l2,%i0
292 
        mov %l3,%i1
293 
.LL81:
294 
        ret
295 
        restore

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