/* Add two limb vectors of equal, non-zero length for PowerPC.

   Copyright (C) 1997-2018 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 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 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <sysdep.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 (__mpn_add_n, 3, 0)

/* Set up for loop below.  */

	mtcrf 0x01,r6

	srwi. r7,r6,1

	li    r10,0

	mtctr r7

	bt    31,L(2)

/* Clear the carry.  */

	addic r0,r0,0

/* Adjust pointers for loop.  */

	addi  r3,r3,-4

	addi  r4,r4,-4

	addi  r5,r5,-4

	b     L(0)

L(2):	lwz  r7,0(r5)

	lwz  r6,0(r4)

	addc r6,r6,r7

	stw  r6,0(r3)

        beq  L(1)

/* 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).  */

L(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 L(0)

/* Return the carry.  */

L(1):	addze r3,r10

	blr

END (__mpn_add_n)