mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-11 05:40:06 +00:00
147 lines
4.3 KiB
ArmAsm
147 lines
4.3 KiB
ArmAsm
# Alpha __mpn_add_n -- Add two limb vectors of the same length > 0 and
|
|
# store sum in a third limb vector.
|
|
|
|
# Copyright (C) 1995 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 <http://www.gnu.org/licenses/>.
|
|
|
|
|
|
# INPUT PARAMETERS
|
|
# res_ptr $16
|
|
# s1_ptr $17
|
|
# s2_ptr $18
|
|
# size $19
|
|
|
|
.set noreorder
|
|
.set noat
|
|
.text
|
|
.align 3
|
|
.globl __mpn_add_n
|
|
.ent __mpn_add_n
|
|
__mpn_add_n:
|
|
.frame $30,0,$26,0
|
|
|
|
or $31,$31,$25 # clear cy
|
|
subq $19,4,$19 # decr loop cnt
|
|
blt $19,.Lend2 # if less than 4 limbs, goto 2nd loop
|
|
# Start software pipeline for 1st loop
|
|
ldq $0,0($18)
|
|
ldq $1,8($18)
|
|
ldq $4,0($17)
|
|
ldq $5,8($17)
|
|
addq $17,32,$17 # update s1_ptr
|
|
ldq $2,16($18)
|
|
addq $0,$4,$20 # 1st main add
|
|
ldq $3,24($18)
|
|
subq $19,4,$19 # decr loop cnt
|
|
ldq $6,-16($17)
|
|
cmpult $20,$0,$25 # compute cy from last add
|
|
ldq $7,-8($17)
|
|
addq $1,$25,$28 # cy add
|
|
addq $18,32,$18 # update s2_ptr
|
|
addq $5,$28,$21 # 2nd main add
|
|
cmpult $28,$25,$8 # compute cy from last add
|
|
blt $19,.Lend1 # if less than 4 limbs remain, jump
|
|
# 1st loop handles groups of 4 limbs in a software pipeline
|
|
.align 4
|
|
.Loop: cmpult $21,$28,$25 # compute cy from last add
|
|
ldq $0,0($18)
|
|
or $8,$25,$25 # combine cy from the two adds
|
|
ldq $1,8($18)
|
|
addq $2,$25,$28 # cy add
|
|
ldq $4,0($17)
|
|
addq $28,$6,$22 # 3rd main add
|
|
ldq $5,8($17)
|
|
cmpult $28,$25,$8 # compute cy from last add
|
|
cmpult $22,$28,$25 # compute cy from last add
|
|
stq $20,0($16)
|
|
or $8,$25,$25 # combine cy from the two adds
|
|
stq $21,8($16)
|
|
addq $3,$25,$28 # cy add
|
|
addq $28,$7,$23 # 4th main add
|
|
cmpult $28,$25,$8 # compute cy from last add
|
|
cmpult $23,$28,$25 # compute cy from last add
|
|
addq $17,32,$17 # update s1_ptr
|
|
or $8,$25,$25 # combine cy from the two adds
|
|
addq $16,32,$16 # update res_ptr
|
|
addq $0,$25,$28 # cy add
|
|
ldq $2,16($18)
|
|
addq $4,$28,$20 # 1st main add
|
|
ldq $3,24($18)
|
|
cmpult $28,$25,$8 # compute cy from last add
|
|
ldq $6,-16($17)
|
|
cmpult $20,$28,$25 # compute cy from last add
|
|
ldq $7,-8($17)
|
|
or $8,$25,$25 # combine cy from the two adds
|
|
subq $19,4,$19 # decr loop cnt
|
|
stq $22,-16($16)
|
|
addq $1,$25,$28 # cy add
|
|
stq $23,-8($16)
|
|
addq $5,$28,$21 # 2nd main add
|
|
addq $18,32,$18 # update s2_ptr
|
|
cmpult $28,$25,$8 # compute cy from last add
|
|
bge $19,.Loop
|
|
# Finish software pipeline for 1st loop
|
|
.Lend1: cmpult $21,$28,$25 # compute cy from last add
|
|
or $8,$25,$25 # combine cy from the two adds
|
|
addq $2,$25,$28 # cy add
|
|
addq $28,$6,$22 # 3rd main add
|
|
cmpult $28,$25,$8 # compute cy from last add
|
|
cmpult $22,$28,$25 # compute cy from last add
|
|
stq $20,0($16)
|
|
or $8,$25,$25 # combine cy from the two adds
|
|
stq $21,8($16)
|
|
addq $3,$25,$28 # cy add
|
|
addq $28,$7,$23 # 4th main add
|
|
cmpult $28,$25,$8 # compute cy from last add
|
|
cmpult $23,$28,$25 # compute cy from last add
|
|
or $8,$25,$25 # combine cy from the two adds
|
|
addq $16,32,$16 # update res_ptr
|
|
stq $22,-16($16)
|
|
stq $23,-8($16)
|
|
.Lend2: addq $19,4,$19 # restore loop cnt
|
|
beq $19,.Lret
|
|
# Start software pipeline for 2nd loop
|
|
ldq $0,0($18)
|
|
ldq $4,0($17)
|
|
subq $19,1,$19
|
|
beq $19,.Lend0
|
|
# 2nd loop handles remaining 1-3 limbs
|
|
.align 4
|
|
.Loop0: addq $0,$25,$28 # cy add
|
|
ldq $0,8($18)
|
|
addq $4,$28,$20 # main add
|
|
ldq $4,8($17)
|
|
addq $18,8,$18
|
|
cmpult $28,$25,$8 # compute cy from last add
|
|
addq $17,8,$17
|
|
stq $20,0($16)
|
|
cmpult $20,$28,$25 # compute cy from last add
|
|
subq $19,1,$19 # decr loop cnt
|
|
or $8,$25,$25 # combine cy from the two adds
|
|
addq $16,8,$16
|
|
bne $19,.Loop0
|
|
.Lend0: addq $0,$25,$28 # cy add
|
|
addq $4,$28,$20 # main add
|
|
cmpult $28,$25,$8 # compute cy from last add
|
|
cmpult $20,$28,$25 # compute cy from last add
|
|
stq $20,0($16)
|
|
or $8,$25,$25 # combine cy from the two adds
|
|
|
|
.Lret: or $25,$31,$0 # return cy
|
|
ret $31,($26),1
|
|
.end __mpn_add_n
|