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/* HP-PA __udiv_qrnnd division support, used from longlong.h.
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* This version runs fast on pre-PA7000 CPUs.
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*
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* Copyright (C) 1993, 1994 Free Software Foundation, Inc.
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* Copyright (c) 1997 by Werner Koch (dd9jn)
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*
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* This file is part of G10.
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*
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* G10 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 of the License, or
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* (at your option) any later version.
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*
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* G10 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*
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* Note: This code is heavily based on the GNU MP Library.
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* Actually it's the same code with only minor changes in the
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* way the data is stored; this is to support the abstraction
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* of an optional secure memory allocation which may be used
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* to avoid revealing of sensitive data due to paging etc.
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* The GNU MP Library itself is published under the LGPL;
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* however I decided to publish this code under the plain GPL.
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*/
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/* INPUT PARAMETERS
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* rem_ptr gr26
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* n1 gr25
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* n0 gr24
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* d gr23
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*
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* The code size is a bit excessive. We could merge the last two ds;addc
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* sequences by simply moving the "bb,< Odd" instruction down. The only
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* trouble is the FFFFFFFF code that would need some hacking.
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*/
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.code
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.export __udiv_qrnnd
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__udiv_qrnnd
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.proc
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.callinfo frame=0,no_calls
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.entry
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comb,< %r23,0,L$largedivisor
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sub %r0,%r23,%r1 ; clear cy as side-effect
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ds %r0,%r1,%r0
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r28
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ds %r25,%r23,%r25
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comclr,>= %r25,%r0,%r0
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addl %r25,%r23,%r25
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stws %r25,0(0,%r26)
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bv 0(%r2)
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addc %r28,%r28,%r28
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L$largedivisor
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extru %r24,31,1,%r19 ; r19 = n0 & 1
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bb,< %r23,31,L$odd
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extru %r23,30,31,%r22 ; r22 = d >> 1
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shd %r25,%r24,1,%r24 ; r24 = new n0
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extru %r25,30,31,%r25 ; r25 = new n1
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sub %r0,%r22,%r21
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ds %r0,%r21,%r0
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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comclr,>= %r25,%r0,%r0
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addl %r25,%r22,%r25
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sh1addl %r25,%r19,%r25
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stws %r25,0(0,%r26)
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bv 0(%r2)
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addc %r24,%r24,%r28
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L$odd addib,sv,n 1,%r22,L$FF.. ; r22 = (d / 2 + 1)
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shd %r25,%r24,1,%r24 ; r24 = new n0
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extru %r25,30,31,%r25 ; r25 = new n1
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sub %r0,%r22,%r21
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ds %r0,%r21,%r0
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r28
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comclr,>= %r25,%r0,%r0
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addl %r25,%r22,%r25
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sh1addl %r25,%r19,%r25
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; We have computed (n1,,n0) / (d + 1), q' = r28, r' = r25
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add,nuv %r28,%r25,%r25
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addl %r25,%r1,%r25
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addc %r0,%r28,%r28
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sub,<< %r25,%r23,%r0
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addl %r25,%r1,%r25
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stws %r25,0(0,%r26)
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bv 0(%r2)
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addc %r0,%r28,%r28
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; This is just a special case of the code above.
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; We come here when d == 0xFFFFFFFF
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L$FF.. add,uv %r25,%r24,%r24
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sub,<< %r24,%r23,%r0
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ldo 1(%r24),%r24
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stws %r24,0(0,%r26)
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bv 0(%r2)
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addc %r0,%r25,%r28
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.exit
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.procend
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