160 lines
3.1 KiB
ArmAsm
160 lines
3.1 KiB
ArmAsm
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/* Alpha 21064 __udiv_qrnnd
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*
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* Copyright (C) 1992, 1994, 1995, 1998,
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* 2001, 2002 Free Software Foundation, Inc.
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*
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* This file is part of Libgcrypt.
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*
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* Libgcrypt is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* Libgcrypt 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License 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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*/
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.set noreorder
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.set noat
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.text
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.align 3
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.globl __udiv_qrnnd
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.ent __udiv_qrnnd
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__udiv_qrnnd:
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.frame $30,0,$26,0
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.prologue 0
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#define cnt $2
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#define tmp $3
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#define rem_ptr $16
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#define n1 $17
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#define n0 $18
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#define d $19
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#define qb $20
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ldiq cnt,16
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blt d,.Largedivisor
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.Loop1: cmplt n0,0,tmp
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addq n1,n1,n1
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bis n1,tmp,n1
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addq n0,n0,n0
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cmpule d,n1,qb
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subq n1,d,tmp
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cmovne qb,tmp,n1
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bis n0,qb,n0
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cmplt n0,0,tmp
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addq n1,n1,n1
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bis n1,tmp,n1
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addq n0,n0,n0
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cmpule d,n1,qb
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subq n1,d,tmp
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cmovne qb,tmp,n1
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bis n0,qb,n0
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cmplt n0,0,tmp
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addq n1,n1,n1
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bis n1,tmp,n1
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addq n0,n0,n0
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cmpule d,n1,qb
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subq n1,d,tmp
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cmovne qb,tmp,n1
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bis n0,qb,n0
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cmplt n0,0,tmp
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addq n1,n1,n1
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bis n1,tmp,n1
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addq n0,n0,n0
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cmpule d,n1,qb
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subq n1,d,tmp
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cmovne qb,tmp,n1
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bis n0,qb,n0
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subq cnt,1,cnt
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bgt cnt,.Loop1
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stq n1,0(rem_ptr)
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bis $31,n0,$0
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ret $31,($26),1
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.Largedivisor:
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and n0,1,$4
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srl n0,1,n0
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sll n1,63,tmp
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or tmp,n0,n0
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srl n1,1,n1
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and d,1,$6
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srl d,1,$5
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addq $5,$6,$5
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.Loop2: cmplt n0,0,tmp
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addq n1,n1,n1
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bis n1,tmp,n1
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addq n0,n0,n0
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cmpule $5,n1,qb
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subq n1,$5,tmp
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cmovne qb,tmp,n1
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bis n0,qb,n0
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cmplt n0,0,tmp
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addq n1,n1,n1
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bis n1,tmp,n1
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addq n0,n0,n0
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cmpule $5,n1,qb
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subq n1,$5,tmp
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cmovne qb,tmp,n1
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bis n0,qb,n0
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cmplt n0,0,tmp
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addq n1,n1,n1
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bis n1,tmp,n1
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addq n0,n0,n0
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cmpule $5,n1,qb
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subq n1,$5,tmp
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cmovne qb,tmp,n1
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bis n0,qb,n0
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cmplt n0,0,tmp
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addq n1,n1,n1
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bis n1,tmp,n1
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addq n0,n0,n0
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cmpule $5,n1,qb
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subq n1,$5,tmp
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cmovne qb,tmp,n1
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bis n0,qb,n0
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subq cnt,1,cnt
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bgt cnt,.Loop2
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addq n1,n1,n1
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addq $4,n1,n1
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bne $6,.LOdd
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stq n1,0(rem_ptr)
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bis $31,n0,$0
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ret $31,($26),1
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.LOdd:
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/* q' in n0. r' in n1 */
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addq n1,n0,n1
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cmpult n1,n0,tmp # tmp := carry from addq
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beq tmp,.LLp6
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addq n0,1,n0
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subq n1,d,n1
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.LLp6: cmpult n1,d,tmp
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bne tmp,.LLp7
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addq n0,1,n0
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subq n1,d,n1
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.LLp7:
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stq n1,0(rem_ptr)
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bis $31,n0,$0
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ret $31,($26),1
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.end __udiv_qrnnd
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