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/* PowerPC-32 add_n -- Add two limb vectors of equal, non-zero length.
*
* Copyright (C) 1992, 1994, 1995, 1998 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"
#ifndef USE_PPC_PATCHES
/*******************
* mpi_limb_t
* mpihelp_add_n( mpi_ptr_t res_ptr, (r3)
* mpi_ptr_t s1_ptr, (r4)
* mpi_ptr_t s2_ptr, (r5)
* mpi_size_t 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:
mtctr 6 # copy size into CTR
lwz 8,0(4) # load least significant s1 limb
lwz 0,0(5) # load least significant s2 limb
addi 3,3,-4 # offset res_ptr, it's updated before used
addc 7,0,8 # add least significant limbs, set cy
bdz Lend # If done, skip loop
Loop: lwzu 8,4(4) # load s1 limb and update s1_ptr
lwzu 0,4(5) # load s2 limb and update s2_ptr
stwu 7,4(3) # store previous limb in load latency slot
adde 7,0,8 # add new limbs with cy, set cy
bdnz Loop # decrement CTR and loop back
Lend: stw 7,4(3) # store ultimate result limb
li 3,0 # load cy into ...
addze 3,3 # ... return value register
blr
#else
/* Add two limb vectors of equal, non-zero length for PowerPC.
Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. 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"
/* mp_limb_t mpn_add_n (mp_ptr res_ptr, mp_srcptr s1_ptr, mp_srcptr s2_ptr,
mp_size_t size)
Calculate s1+s2 and put result in res_ptr; return carry, 0 or 1. */
/* Note on optimisation: This code is optimal for the 601. Almost every other
possible 2-unrolled inner loop will not be. Also, watch out for the
alignment... */
EALIGN(_mpihelp_add_n,3,0)
/* Set up for loop below. */
mtcrf 0x01,%r6
srwi. %r7,%r6,1
li %r10,0
mtctr %r7
bt 31,2f
/* Clear the carry. */
addic %r0,%r0,0
/* Adjust pointers for loop. */
addi %r3,%r3,-4
addi %r4,%r4,-4
addi %r5,%r5,-4
b 0f
2: lwz %r7,0(%r5)
lwz %r6,0(%r4)
addc %r6,%r6,%r7
stw %r6,0(%r3)
beq 1f
/* The loop. */
/* Align start of loop to an odd word boundary to guarantee that the
last two words can be fetched in one access (for 601). */
0: lwz %r9,4(%r4)
lwz %r8,4(%r5)
lwzu %r6,8(%r4)
lwzu %r7,8(%r5)
adde %r8,%r9,%r8
stw %r8,4(%r3)
adde %r6,%r6,%r7
stwu %r6,8(%r3)
bdnz 0b
/* Return the carry. */
1: addze %r3,%r10
blr
END(_mpihelp_add_n)
#endif
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