171 lines
3.1 KiB
ArmAsm
171 lines
3.1 KiB
ArmAsm
# Alpha EV5 __mpn_rshift --
|
|
|
|
# Copyright (C) 1994-2022 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. If not, see <https://www.gnu.org/licenses/>.
|
|
|
|
|
|
# INPUT PARAMETERS
|
|
# res_ptr r16
|
|
# s1_ptr r17
|
|
# size r18
|
|
# cnt r19
|
|
|
|
# This code runs at 3.25 cycles/limb on the EV5.
|
|
|
|
.set noreorder
|
|
.set noat
|
|
.text
|
|
.align 3
|
|
.globl __mpn_rshift
|
|
.ent __mpn_rshift
|
|
__mpn_rshift:
|
|
.frame $30,0,$26,0
|
|
|
|
ldq $4,0($17) # load first limb
|
|
subq $31,$19,$20
|
|
subq $18,1,$18
|
|
and $18,4-1,$28 # number of limbs in first loop
|
|
sll $4,$20,$0 # compute function result
|
|
|
|
beq $28,.L0
|
|
subq $18,$28,$18
|
|
|
|
.align 3
|
|
.Loop0: ldq $3,8($17)
|
|
addq $16,8,$16
|
|
srl $4,$19,$5
|
|
addq $17,8,$17
|
|
subq $28,1,$28
|
|
sll $3,$20,$6
|
|
or $3,$3,$4
|
|
or $5,$6,$8
|
|
stq $8,-8($16)
|
|
bne $28,.Loop0
|
|
|
|
.L0: srl $4,$19,$24
|
|
beq $18,.Lend
|
|
# warm up phase 1
|
|
ldq $1,8($17)
|
|
subq $18,4,$18
|
|
ldq $2,16($17)
|
|
ldq $3,24($17)
|
|
ldq $4,32($17)
|
|
beq $18,.Lend1
|
|
# warm up phase 2
|
|
sll $1,$20,$7
|
|
srl $1,$19,$21
|
|
sll $2,$20,$8
|
|
ldq $1,40($17)
|
|
srl $2,$19,$22
|
|
ldq $2,48($17)
|
|
sll $3,$20,$5
|
|
or $7,$24,$7
|
|
srl $3,$19,$23
|
|
or $8,$21,$8
|
|
sll $4,$20,$6
|
|
ldq $3,56($17)
|
|
srl $4,$19,$24
|
|
ldq $4,64($17)
|
|
subq $18,4,$18
|
|
beq $18,.Lend2
|
|
.align 4
|
|
# main loop
|
|
.Loop: stq $7,0($16)
|
|
or $5,$22,$5
|
|
stq $8,8($16)
|
|
or $6,$23,$6
|
|
|
|
sll $1,$20,$7
|
|
subq $18,4,$18
|
|
srl $1,$19,$21
|
|
unop # ldq $31,-96($17)
|
|
|
|
sll $2,$20,$8
|
|
ldq $1,72($17)
|
|
srl $2,$19,$22
|
|
ldq $2,80($17)
|
|
|
|
stq $5,16($16)
|
|
or $7,$24,$7
|
|
stq $6,24($16)
|
|
or $8,$21,$8
|
|
|
|
sll $3,$20,$5
|
|
unop # ldq $31,-96($17)
|
|
srl $3,$19,$23
|
|
addq $16,32,$16
|
|
|
|
sll $4,$20,$6
|
|
ldq $3,88($17)
|
|
srl $4,$19,$24
|
|
ldq $4,96($17)
|
|
|
|
addq $17,32,$17
|
|
bne $18,.Loop
|
|
# cool down phase 2/1
|
|
.Lend2: stq $7,0($16)
|
|
or $5,$22,$5
|
|
stq $8,8($16)
|
|
or $6,$23,$6
|
|
sll $1,$20,$7
|
|
srl $1,$19,$21
|
|
sll $2,$20,$8
|
|
srl $2,$19,$22
|
|
stq $5,16($16)
|
|
or $7,$24,$7
|
|
stq $6,24($16)
|
|
or $8,$21,$8
|
|
sll $3,$20,$5
|
|
srl $3,$19,$23
|
|
sll $4,$20,$6
|
|
srl $4,$19,$24
|
|
# cool down phase 2/2
|
|
stq $7,32($16)
|
|
or $5,$22,$5
|
|
stq $8,40($16)
|
|
or $6,$23,$6
|
|
stq $5,48($16)
|
|
stq $6,56($16)
|
|
# cool down phase 2/3
|
|
stq $24,64($16)
|
|
ret $31,($26),1
|
|
|
|
# cool down phase 1/1
|
|
.Lend1: sll $1,$20,$7
|
|
srl $1,$19,$21
|
|
sll $2,$20,$8
|
|
srl $2,$19,$22
|
|
sll $3,$20,$5
|
|
or $7,$24,$7
|
|
srl $3,$19,$23
|
|
or $8,$21,$8
|
|
sll $4,$20,$6
|
|
srl $4,$19,$24
|
|
# cool down phase 1/2
|
|
stq $7,0($16)
|
|
or $5,$22,$5
|
|
stq $8,8($16)
|
|
or $6,$23,$6
|
|
stq $5,16($16)
|
|
stq $6,24($16)
|
|
stq $24,32($16)
|
|
ret $31,($26),1
|
|
|
|
.Lend: stq $24,0($16)
|
|
ret $31,($26),1
|
|
.end __mpn_rshift
|