lshift.s
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- ; 29000 __gmpn_lshift --
- ; 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 3 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. If not, see http://www.gnu.org/licenses/.
- ; 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_lshift
- .word 0x60000
- ___gmpn_lshift:
- sll gr116,lr4,2
- add lr3,gr116,lr3
- add lr2,gr116,lr2
- sub lr3,lr3,4
- load 0,0,gr119,lr3
- subr gr116,lr5,32
- srl 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,lr5
- sub gr117,gr117,2 ; count for jmpfdec
- ; Main loop working 8 limbs/iteration.
- Loop: sub lr3,lr3,32
- mtsrim cr,(8-1)
- loadm 0,0,gr100,lr3
- extract gr109,gr119,gr107
- extract gr108,gr107,gr106
- extract gr107,gr106,gr105
- extract gr106,gr105,gr104
- extract gr105,gr104,gr103
- extract gr104,gr103,gr102
- extract gr103,gr102,gr101
- extract gr102,gr101,gr100
- sub lr2,lr2,32
- mtsrim cr,(8-1)
- storem 0,0,gr102,lr2
- jmpfdec gr117,Loop
- or gr119,gr100,0
- ; 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: sub lr3,lr3,4
- load 0,0,gr116,lr3
- extract gr117,gr119,gr116
- sub lr2,lr2,4
- store 0,0,gr117,lr2
- jmpfdec lr4,Loop2
- or gr119,gr116,0
- Lend: extract gr117,gr119,0
- sub lr2,lr2,4
- jmpi lr0
- store 0,0,gr117,lr2