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160 lines
2.7 KiB
ArmAsm
160 lines
2.7 KiB
ArmAsm
# Alpha 21064 __udiv_qrnnd
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# Copyright (C) 1992-2024 Free Software Foundation, Inc.
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# This file is part of the GNU MP Library.
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# The GNU MP Library 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 published by
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# the Free Software Foundation; either version 2.1 of the License, or (at your
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# option) any later version.
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# The GNU MP Library is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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# License for more details.
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# You should have received a copy of the GNU Lesser General Public License
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# along with the GNU MP Library. If not, see <https://www.gnu.org/licenses/>.
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#include <sysdep.h>
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.set noreorder
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.set noat
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.text
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LEAF(__udiv_qrnnd, 0)
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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 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 $6,$Odd
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stq n1,0(rem_ptr)
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bis $31,n0,$0
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ret $31,($26),1
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$Odd:
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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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subq n1,d,AT
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addq n0,tmp,n0
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cmovne tmp,AT,n1
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cmpult n1,d,tmp
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addq n0,1,AT
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cmoveq tmp,AT,n0
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subq n1,d,AT
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cmoveq tmp,AT,n1
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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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