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# 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
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