109 lines
2.8 KiB
ArmAsm
109 lines
2.8 KiB
ArmAsm
/* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson <rth@tamu.edu>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sysdep.h>
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#ifdef __linux__
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# include <asm/gentrap.h>
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# include <asm/pal.h>
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#else
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# include <machine/pal.h>
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#endif
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.set noat
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.align 4
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.globl ldiv
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.ent ldiv
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ldiv:
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.frame sp, 0, ra
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#ifdef PROF
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ldgp gp, 0(pv)
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lda AT, _mcount
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jsr AT, (AT), _mcount
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.prologue 1
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#else
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.prologue 0
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#endif
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#define divisor t1
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#define mask t2
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#define quotient t3
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#define modulus t4
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#define tmp1 t5
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#define tmp2 t6
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#define compare t7
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/* find correct sign for input to unsigned divide loop. */
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mov a1, modulus # e0 :
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mov a2, divisor # .. e1 :
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negq a1, tmp1 # e0 :
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negq a2, tmp2 # .. e1 :
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mov zero, quotient # e0 :
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mov 1, mask # .. e1 :
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cmovlt a1, tmp1, modulus # e0 :
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cmovlt a2, tmp2, divisor # .. e1 :
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beq a2, $divbyzero # e1 :
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unop # :
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/* shift divisor left. */
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1: cmpult divisor, modulus, compare # e0 :
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blt divisor, 2f # .. e1 :
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addq divisor, divisor, divisor # e0 :
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addq mask, mask, mask # .. e1 :
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bne compare, 1b # e1 :
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unop # :
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/* start to go right again. */
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2: addq quotient, mask, tmp2 # e1 :
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srl mask, 1, mask # .. e0 :
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cmpule divisor, modulus, compare # e0 :
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subq modulus, divisor, tmp1 # .. e1 :
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cmovne compare, tmp2, quotient # e1 :
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srl divisor, 1, divisor # .. e0 :
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cmovne compare, tmp1, modulus # e0 :
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bne mask, 2b # .. e1 :
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/* find correct sign for result. */
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xor a1, a2, compare # e0 :
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negq quotient, tmp1 # .. e1 :
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negq modulus, tmp2 # e0 :
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cmovlt compare, tmp1, quotient # .. e1 :
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cmovlt a1, tmp2, modulus # e1 :
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/* and store it away in the structure. */
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9: stq quotient, 0(a0) # .. e0 :
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mov a0, v0 # e1 :
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stq modulus, 8(a0) # .. e0 :
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ret # e1 :
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$divbyzero:
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mov a0, v0
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lda a0, GEN_INTDIV
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call_pal PAL_gentrap
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/* if trap returns, return zero. */
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stq zero, 0(v0)
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stq zero, 8(v0)
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ret
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.end ldiv
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weak_alias(ldiv, lldiv)
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