mirror of git://git.gnupg.org/gnupg.git
87 lines
2.6 KiB
ArmAsm
87 lines
2.6 KiB
ArmAsm
/* IBM POWER add_n -- Add two limb vectors of equal, non-zero length.
|
|
*
|
|
* Copyright (C) 1992, 1994, 1995, 1996, 1999 Free Software Foundation, Inc.
|
|
*
|
|
* This file is part of GnuPG.
|
|
*
|
|
* GnuPG is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GnuPG 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
|
|
*/
|
|
|
|
#include "sysdep.h"
|
|
#include "asm-syntax.h"
|
|
|
|
/*
|
|
# INPUT PARAMETERS
|
|
# res_ptr r3
|
|
# s1_ptr r4
|
|
# s2_ptr r5
|
|
# size r6
|
|
*/
|
|
|
|
.toc
|
|
.extern mpihelp_add_n[DS]
|
|
.extern .mpihelp_add_n
|
|
.csect [PR]
|
|
.align 2
|
|
.globl mpihelp_add_n
|
|
.globl .mpihelp_add_n
|
|
.csect mpihelp_add_n[DS]
|
|
mpihelp_add_n:
|
|
.long .mpihelp_add_n, TOC[tc0], 0
|
|
.csect [PR]
|
|
.mpihelp_add_n:
|
|
andil. 10,6,1 # odd or even number of limbs?
|
|
l 8,0(4) # load least significant s1 limb
|
|
l 0,0(5) # load least significant s2 limb
|
|
cal 3,-4(3) # offset res_ptr, it's updated before it's used
|
|
sri 10,6,1 # count for unrolled loop
|
|
a 7,0,8 # add least significant limbs, set cy
|
|
mtctr 10 # copy count into CTR
|
|
beq 0,Leven # branch if even # of limbs (# of limbs >= 2)
|
|
|
|
# We have an odd # of limbs. Add the first limbs separately.
|
|
cmpi 1,10,0 # is count for unrolled loop zero?
|
|
bne 1,L1 # branch if not
|
|
st 7,4(3)
|
|
aze 3,10 # use the fact that r10 is zero...
|
|
br # return
|
|
|
|
# We added least significant limbs. Now reload the next limbs to enter loop.
|
|
L1: lu 8,4(4) # load s1 limb and update s1_ptr
|
|
lu 0,4(5) # load s2 limb and update s2_ptr
|
|
stu 7,4(3)
|
|
ae 7,0,8 # add limbs, set cy
|
|
Leven: lu 9,4(4) # load s1 limb and update s1_ptr
|
|
lu 10,4(5) # load s2 limb and update s2_ptr
|
|
bdz Lend # If done, skip loop
|
|
|
|
Loop: lu 8,4(4) # load s1 limb and update s1_ptr
|
|
lu 0,4(5) # load s2 limb and update s2_ptr
|
|
ae 11,9,10 # add previous limbs with cy, set cy
|
|
stu 7,4(3) #
|
|
lu 9,4(4) # load s1 limb and update s1_ptr
|
|
lu 10,4(5) # load s2 limb and update s2_ptr
|
|
ae 7,0,8 # add previous limbs with cy, set cy
|
|
stu 11,4(3) #
|
|
bdn Loop # decrement CTR and loop back
|
|
|
|
Lend: ae 11,9,10 # add limbs with cy, set cy
|
|
st 7,4(3) #
|
|
st 11,8(3) #
|
|
lil 3,0 # load cy into ...
|
|
aze 3,3 # ... return value register
|
|
br
|
|
|