90 lines
2.2 KiB
ArmAsm
90 lines
2.2 KiB
ArmAsm
|
; 29000 __gmpn_rshift --
|
||
|
|
|
||
|
|
; Copyright 1992, 1994, 2000 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
; This file is part of the GNU MP Library.
|
||
|
|
|
||
|
|
; The GNU MP Library is free software; you can redistribute it and/or modify
|
||
|
|
; it under the terms of the GNU Lesser General Public License as published by
|
||
|
|
; the Free Software Foundation; either version 2.1 of the License, or (at your
|
||
|
|
; option) any later version.
|
||
|
|
|
||
|
|
; The GNU MP Library is distributed in the hope that it will be useful, but
|
||
|
|
; WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
||
|
|
; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
||
|
|
; License for more details.
|
||
|
|
|
||
|
|
; You should have received a copy of the GNU Lesser General Public License
|
||
|
|
; along with the GNU MP Library; see the file COPYING.LIB. If not, write to
|
||
|
|
; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
|
||
|
|
; MA 02110-1301, USA.
|
||
|
|
|
||
|
|
|
||
|
|
; INPUT PARAMETERS
|
||
|
|
; res_ptr lr2
|
||
|
|
; s1_ptr lr3
|
||
|
|
; s2_ptr lr4
|
||
|
|
; size lr5
|
||
|
|
|
||
|
|
; We use the loadm/storem instructions and operate on chunks of 8
|
||
|
|
; limbs/per iteration, until less than 8 limbs remain.
|
||
|
|
|
||
|
|
.sect .lit,lit
|
||
|
|
.text
|
||
|
|
.align 4
|
||
|
|
.global ___gmpn_rshift
|
||
|
|
.word 0x60000
|
||
|
|
___gmpn_rshift:
|
||
|
|
load 0,0,gr119,lr3
|
||
|
|
add lr3,lr3,4
|
||
|
|
|
||
|
|
subr gr116,lr5,32
|
||
|
|
sll gr96,gr119,gr116 ; return value
|
||
|
|
sub lr4,lr4,1 ; actual loop count is SIZE - 1
|
||
|
|
|
||
|
|
srl gr117,lr4,3 ; chuck count = (actual count) / 8
|
||
|
|
cpeq gr118,gr117,0
|
||
|
|
jmpt gr118,Ltail
|
||
|
|
mtsr fc,gr116
|
||
|
|
|
||
|
|
sub gr117,gr117,2 ; count for jmpfdec
|
||
|
|
|
||
|
|
; Main loop working 8 limbs/iteration.
|
||
|
|
Loop: mtsrim cr,(8-1)
|
||
|
|
loadm 0,0,gr100,lr3
|
||
|
|
add lr3,lr3,32
|
||
|
|
|
||
|
|
extract gr98,gr100,gr119
|
||
|
|
extract gr99,gr101,gr100
|
||
|
|
extract gr100,gr102,gr101
|
||
|
|
extract gr101,gr103,gr102
|
||
|
|
extract gr102,gr104,gr103
|
||
|
|
extract gr103,gr105,gr104
|
||
|
|
extract gr104,gr106,gr105
|
||
|
|
extract gr105,gr107,gr106
|
||
|
|
|
||
|
|
mtsrim cr,(8-1)
|
||
|
|
storem 0,0,gr98,lr2
|
||
|
|
add lr2,lr2,32
|
||
|
|
jmpfdec gr117,Loop
|
||
|
|
or gr119,gr107,0
|
||
|
|
|
||
|
|
; Code for the last up-to-7 limbs.
|
||
|
|
|
||
|
|
and lr4,lr4,(8-1)
|
||
|
|
Ltail: cpeq gr118,lr4,0
|
||
|
|
jmpt gr118,Lend
|
||
|
|
sub lr4,lr4,2 ; count for jmpfdec
|
||
|
|
|
||
|
|
Loop2: load 0,0,gr100,lr3
|
||
|
|
add lr3,lr3,4
|
||
|
|
extract gr117,gr100,gr119
|
||
|
|
store 0,0,gr117,lr2
|
||
|
|
add lr2,lr2,4
|
||
|
|
jmpfdec lr4,Loop2
|
||
|
|
or gr119,gr100,0
|
||
|
|
|
||
|
|
Lend: srl gr117,gr119,lr5
|
||
|
|
jmpi lr0
|
||
|
|
store 0,0,gr117,lr2
|