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1b35a57b1c
For the explicit calls to .udiv/.umul in assembler, I made a mechanical (read as: safe) transformation. I didn't attempt to make any simplifications. In particular, __ndelay and __udelay can be simplified significantly. Some of the %y reads are unnecessary and these routines have no need any longer for allocating a register window, they can be leaf functions. Signed-off-by: David S. Miller <davem@davemloft.net>
282 lines
5.5 KiB
ArmAsm
282 lines
5.5 KiB
ArmAsm
/* 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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.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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mov 0,%o1
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wr %g0, 0, %y
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udiv %o0, %o1, %o0
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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
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mulscc %g1,%o4,%g1
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mulscc %g1,0,%g1
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add %g1,%g2,%o0
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rd %y,%o2
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cmp %o0,%i0
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bgu,a .LL78
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add %o1,-1,%o1
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bne,a .LL50
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mov 0,%o2
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cmp %o2,%i3
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bleu .LL50
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mov 0,%o2
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add %o1,-1,%o1
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.LL78:
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mov 0,%o2
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.LL50:
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mov %o1,%l1
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.LL86:
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mov %o2,%l0
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mov %l0,%i0
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mov %l1,%i1
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cmp %l4,0
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be .LL81
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sub %g0,%i1,%o0
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mov %o0,%l3
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subcc %g0,%o0,%g0
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sub %g0,%i0,%o0
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subx %o0,0,%l2
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mov %l2,%i0
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mov %l3,%i1
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.LL81:
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ret
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restore
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