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dnl HP-PA 2.0 32-bit mpn_add_n -- Add two limb vectors of the same length > 0
dnl and store sum in a third limb vector.
dnl Copyright 1997, 1998, 2000, 2001, 2002 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU Lesser General Public License as published
dnl by the Free Software Foundation; either version 3 of the License, or (at
dnl your option) any later version.
dnl The GNU MP Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
dnl License for more details.
dnl You should have received a copy of the GNU Lesser General Public License
dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
include(`../config.m4')
C INPUT PARAMETERS
C res_ptr gr26
C s1_ptr gr25
C s2_ptr gr24
C size gr23
C This runs at 2 cycles/limb on PA8000.
ASM_START()
PROLOGUE(mpn_add_n)
sub %r0,%r23,%r22
zdep %r22,30,3,%r28 C r28 = 2 * (-n & 7)
zdep %r22,29,3,%r22 C r22 = 4 * (-n & 7)
sub %r25,%r22,%r25 C offset s1_ptr
sub %r24,%r22,%r24 C offset s2_ptr
sub %r26,%r22,%r26 C offset res_ptr
blr %r28,%r0 C branch into loop
add %r0,%r0,%r0 C reset carry
LDEF(loop)
ldw 0(%r25),%r20
ldw 0(%r24),%r31
addc %r20,%r31,%r20
stw %r20,0(%r26)
LDEF(7)
ldw 4(%r25),%r21
ldw 4(%r24),%r19
addc %r21,%r19,%r21
stw %r21,4(%r26)
LDEF(6)
ldw 8(%r25),%r20
ldw 8(%r24),%r31
addc %r20,%r31,%r20
stw %r20,8(%r26)
LDEF(5)
ldw 12(%r25),%r21
ldw 12(%r24),%r19
addc %r21,%r19,%r21
stw %r21,12(%r26)
LDEF(4)
ldw 16(%r25),%r20
ldw 16(%r24),%r31
addc %r20,%r31,%r20
stw %r20,16(%r26)
LDEF(3)
ldw 20(%r25),%r21
ldw 20(%r24),%r19
addc %r21,%r19,%r21
stw %r21,20(%r26)
LDEF(2)
ldw 24(%r25),%r20
ldw 24(%r24),%r31
addc %r20,%r31,%r20
stw %r20,24(%r26)
LDEF(1)
ldw 28(%r25),%r21
ldo 32(%r25),%r25
ldw 28(%r24),%r19
addc %r21,%r19,%r21
stw %r21,28(%r26)
ldo 32(%r24),%r24
addib,> -8,%r23,L(loop)
ldo 32(%r26),%r26
bv (%r2)
addc %r0,%r0,%r28
EPILOGUE()
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