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/* hppa add_n -- Add two limb vectors of the same length > 0 and store
* sum in a third limb vector.
*
* Copyright (C) 1992, 1994 Free Software Foundation, Inc.
* Copyright (C) 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
*
* Note: This code is heavily based on the GNU MP Library.
* Actually it's the same code with only minor changes in the
* way the data is stored; this is to support the abstraction
* of an optional secure memory allocation which may be used
* to avoid revealing of sensitive data due to paging etc.
* The GNU MP Library itself is published under the LGPL;
* however I decided to publish this code under the plain GPL.
*/
/*******************
* mpi_limb_t
* mpihelp_add_n( mpi_ptr_t res_ptr, (gr26)
* mpi_ptr_t s1_ptr, (gr25)
* mpi_ptr_t s2_ptr, (gr24)
* mpi_size_t size) (gr23)
*
* One might want to unroll this as for other processors, but it turns
* out that the data cache contention after a store makes such
* unrolling useless. We can't come under 5 cycles/limb anyway.
*/
.code
.export mpihelp_add_n
mpihelp_add_n
.proc
.callinfo frame=0,no_calls
.entry
ldws,ma 4(0,%r25),%r20
ldws,ma 4(0,%r24),%r19
addib,= -1,%r23,L$end ; check for (SIZE == 1)
add %r20,%r19,%r28 ; add first limbs ignoring cy
L$loop ldws,ma 4(0,%r25),%r20
ldws,ma 4(0,%r24),%r19
stws,ma %r28,4(0,%r26)
addib,<> -1,%r23,L$loop
addc %r20,%r19,%r28
L$end stws %r28,0(0,%r26)
bv 0(%r2)
addc %r0,%r0,%r28
.exit
.procend
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